Dissertations / Theses on the topic 'Interior permanent magnet'
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Constantin, Radu Stefan. "Comparative study of surface permanent magnet and interior permanent magnet machines for direct drive wind power application." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19800/.
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Vaez, Sadegh. "Loss minimization control of interior permanent magnet motor drives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22499.pdf.
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Ray, Subhasis. "Multi-objective optimization of an interior permanent magnet motor." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116021.
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In recent years, due to growing environmental awareness regarding global warming, green cars, such as hybrid electric vehicles, have gained a lot of importance. With the decreasing cost of rare earth magnets, brushless permanent magnet motors, such as the Interior Permanent Magnet Motor, have found usage as part of the traction drive system in these types of vehicles. As a design issue, building a motor with a performance curve that suits both city and highway driving has been treated in this thesis as a multi-objective problem; matching specific points of the torque-speed curve to the desired performance output. Conventionally, this has been treated as separate problems or as a combination of several individual problems, but doing so gives little information about the trade-offs involved. As a means of identifying the compromising solutions, we have developed a stochastic optimizer for tackling electromagnetic device optimization and have also demonstrated a new innovative way of studying how different design parameters affect performance.
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Weinreb, Benjamin Stone. "A novel magnetically levitated interior permanent magnet slice motor." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/130215.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 223-226).
A magnetically levitated motor, also known as a bearingless motor, combines the function of a magnetic bearing and motor to both levitate and rotate a rotor. This enables contact-free operation, which is advantageous in applications which require low friction, long operational lifetime, and high purity or cleanliness. In this thesis, we present the design, construction, and testing of a novel magnetically levitated interior permanent magnet slice motor. This design is targeted for use as a blood pump in extracorporeal life support (ECLS) applications. A magnetically levitated blood pump reduces the risk of blood damage that frequently occurs at the blood seal in a conventional pump due to frictional heat generation.
We have designed and constructed a bearingless motor prototype system that consists of a novel segmented dipole interior permanent magnet (IPM) slice rotor, a bearingless motor stator based on a prior design, a position sensing system, a control system, and a user interface. The segmented dipole IPM rotor contains a unique pattern of interior permanent magnets arranged to generate a dipole air gap flux pattern. The magnets are encapsulated within an electrical steel rotor structure. This simple design provides balanced force and torque capacities as compared to prior art designs and alternate topologies. In addition to the segmented dipole IPM design, we also analyze several other bearingless IPM rotor design concepts and present comparisons of their predicted performance. The sensing system is used to provide rotor angle and radial position estimates for force commutation, torque commutation, and closed-loop radial suspension feedback control.
This system utilizes an array of Hall elements to sense the rotor's rotation angle along with differential pairs of optical sensors to sense the rotor's radial position. We also process the Hall element signals to produce estimates of the rotor's axial and tilt motions. While not required for commutation or control, these additional estimates are useful for characterizing the passively stable dynamics of the slice motor. We also perform tests to experimentally characterize the bearingless motor system performance. In these experiments, we demonstrate stable levitation and open-loop rotation of the segmented dipole IPM rotor. The system achieves a maximum rotor speed of 6156 RPM with no load in air. The system also exhibits asymmetric and rotor-angle-dependent suspension dynamics, achieving a minimum unity gain loop crossover frequency of 117 Hz.
The sensing system achieves 0.17 [mu]m RMS radial position resolution at a 15.6 kHz bandwidth and 0.015 degree RMS angular resolution at a 1.17 kHz bandwidth. Given these results, the segmented dipole IPM slice motor shows promise for ECLS applications as well as other applications which require a non-contact solution. The Hall element-based sensing system also shows promise for future use in prototype bearingless motor systems to provide both angular position estimates and diagnostic estimates of the rotor tilt and axial motions.
by Benjamin Stone Weinreb.
S.M.
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
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Uddin, Mohammad Nasir. "Intelligent control of an interior permanent magnet synchronous motor drive." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0021/NQ55128.pdf.
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Germishuizen, Johannes Jacobus. "Analysis of interior permanent magnet motors with non-overlapping windings." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1400.
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Lovelace, Edward Carl Francis. "Optimization of a magnetically saturable interior permanent-magnet synchronous machine drive." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9085.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (p. 258-263).
Interior permanent magnet (IPM) synchronous machines are attractive because they can achieve constant-power operation over a wide speed range with limited magnet strength requirements and reduced power electronics cost. These characteristics provide the IPM machine with advantages over alternative machine types in applications such as spindle and traction drives. An important challenge for high-performance IPM machine design is to model the magnetic saturation of the core in a manner that is accurate, flexible, and computationally fast for design optimization. A magnetically-saturable lumped parameter model (LPM) is developed for the optimized design of high-performance IPM synchronous machine drives. Using equivalent magnetic circuit analyses, the dq-frame inductances and magnet flux linkage are calculated for transversely-laminated IPM machines. The lumped parameters are employed to predict machine drive system performance for both rated-torque and constant-power operation. The results of saturable model calculations and finite element analysis (FEA) match very closely for the machine inductances, magnet flux linkage, and converted torque. Further validation is presented by comparing measurements of existing experimental machines to predictions from the saturable lumped parameter model. Agreement of measurements and predictions for the highly nonlinear saturable q-axis inductance is within 5% in the saturated excitation range. The utility of the saturable LPM is then demonstrated by developing a cost-optimized design for an automotive integrated starter/generator (ISG) that is rated at 4 to 6 kW during generating operation. This ISG machine is mounted in a direct-drive mechanical configuration on the engine crankshaft. Agreement between the saturable LPM and FEA calculations for q- and d- axis inductances and PM flux linkage are all within 5% for the entire excitation range. Results of this model have been combined with structural FEA and demagnetization studies to produce a machine design that is predicted to meet all key ISG performance requirements. For this application and the chosen cost model, it is shown that optimizing the combined machine and drive system versus optimizing only the machine reduces the overall cost prediction by 12%.
by Edward Carl Francis Lovelace.
Ph.D.
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Xia, Bing. "Investigation of novel multi-layer spoke-type ferrite interior permanent magnet machines." Thesis, Cranfield University, 2017. http://dspace.lib.cranfield.ac.uk/handle/1826/12320.
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The permanent magnet synchronous machines have been attracting more and more attention due to the advantages of high torque density, outstanding efficiency and maturing technologies. Under the urges of mandatory energy efficiency requirements, they are considered as the most potential candidates to replace the comparatively low-efficient induction machines which dominate the industrial market. However, most of the high performance permanent magnet machines are based on high cost rare-earth materials. Thus, there will be huge demands for low-cost high-performance permanent magnet machines. Ferrite magnet is inexpensive and abundant in supply, and is considered as the most promising alternative to achieve the goal of low cost and high performance. In consideration of the low magnetic energy, this thesis explored the recent developments and possible ideas of ferrite machines, and proposed a novel multi-layer spoke-type interior permanent magnet configuration combining the advantages of flux focusing technique and multi-layer structure. With comparable material cost to induction machines, the proposed ferrite magnet design could deliver 27% higher power with 2-4% higher efficiency with exactly the same frame size. Based on the data base of International Energy Agency (IEA), electricity consumed by electric machines reached 7.1PWh in 2006 [1]. Considering that induction machines take up 90% of the overall industrial installation, the potential energy savings is enormous. This thesis contributes in five key aspects towards the investigation and design of low-cost high-performance ferrite permanent magnet machines. Firstly, accurate analytical models for the multi-layer configurations were developed with the consideration of spatial harmonics, and provided effective yet simple way for preliminary design. Secondly, the influence of key design parameters on performance of the multi-layer ferrite machines were comprehensively investigated, and optimal design could be carried out based on the insightful knowledge revealed. Thirdly, systematic investigation of the demagnetization mechanism was carried out, focusing on the three key factors: armature MMF, intrinsic coercivity and working temperature. Anti-demagnetization designs were presented accordingly to reduce the risk of performance degradation and guarantee the safe operation under various loading conditions. Then, comparative study was carried out with a commercial induction machine for verification of the superior performance of the proposed ferrite machine. Without loss of generality, the two machines had identical stator cores, same rotor diameter and stacking length. Under the operating condition of same stator copper loss, the results confirmed the superior performance of the ferrite machine in terms of torque density, power factor and efficiency. Lastly, mechanical design was discussed to reduce the cost of mass production, and the experimental effort on the prototype machine validates the advantageous performance as well as the analytical and FEA predictions.
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Kalyan, Mohamedreza. "Comparison of interior permanent magnet synchronous machines for a high-speed application." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29442.
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Permanent Magnet machines have been increasingly used in high-speed applications due to the advantages they offer such as higher efficiency, output torque and, output power. This dissertation discusses the electrical and magnetic design of permanent magnet machines and the design and analysis of two 10 kW, 30000 rpm Interior Permanent Magnet (IPM) machines. This dissertation consists of two parts: the first part discusses high-speed machine topologies, and in particular the permanent magnet machine. Trends, advantages, disadvantages, recent developments, etc. are discussed and conclusions are made. The second part presents the design, analysis and testing of interior permanent magnet machines for a high-speed application. The machines are designed from first principles and are simulated using Ansys Maxwell software to understand the finite element analysis. In order to obtain a fair comparison between the machines, the required output criteria was used as the judging criteria (10kW, 30000 rpm). As a result, the rotor diameter, stator diameter, airgap length, and stack length were kept the same for both machines. The winding configuration was set as distributed windings, however the number of turns and other details were kept flexible in order to be able to obtain the best design for each machine. Similarly, the magnet volume was kept flexible as this could be used as a comparison criteria relating to the cost of the machines. The two IPM topologies are compared with respect to their torque, magnetic field, airgap flux, core loss, efficiency, and cost. The radial IPM produces a smoother torque output, with lower torque ripple, and has lower losses compared to the circumferential IPM which produces a higher torque and power output. Furthermore, the circumferential IPM also experiences much higher torque ripple and core losses, both of which are highly undesirable characteristics for high-speed machines. In addition, the circumferential IPM has a much more complex manufacturing process compared to the radial IPM which would significantly increase the cost of prototyping the machine, thus the radial IPM was selected for prototyping and brief experimental analysis. The radial IPM has been experimentally tested under no-load conditions. These results were successfully compared to the simulated and analytical results to show correlation between the design and experimental process. Potential areas of further work may include conducting detailed loss analysis to understand the effects that changing various design parameters has on the core loss and overall performance. Detailed thermal and mechanical analysis of the machines may also result in interesting conclusions that would alter the design of the machine to make it more efficient.
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Butt, Casey Benjamin. "Simplified fuzzy logic controller based vector control of an interior permanent magnet motor /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,155545.
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Yang, Yan. "Initial rotor position estimation for low saliency interior permanent-magnet synchronous motor drives." Thesis, Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/yang/YangY0511.pdf.
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This work presents an initial rotor position estimation method for low saliency interior permanent-magnet synchronous motor (IPMSM) drives. The method injects signals into the stationary alpha-beta frame of the motor and substitutes the injected signals into the stationary alpha-beta frame model of the motor to solve for the rotor position. In particular, the method injects specific signals into the motor to eliminate the rotor-position-independent terms while keeping the rotor-position and motor-saliency dependent terms in the motor model. As a result, the rotor-position and motor-saliency dependent terms are invulnerable to errors or noise in the rotor-position-independent terms and therefore when used to solve for the rotor position, lead to accurate results in rotor position estimation. Experimental results show that the position estimation error is less than 5° electrical for a low saliency IPMSM whose d-axis and q-axis inductance are 1.65mH and 1.70mH respectively.
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Aorith, Hawa. "Efficiency optimised control of interior permanent magnet machine drives in electric vehicle applications." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/8161/.
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The thesis focuses on the losses minimisation of an interior permanent magnet synchronous machine (IPMSM) drive in electric vehicle applications. As drive losses are a combination of the IPMSM losses and the inverter losses, this thesis is mainly divided into two parts: the first part deals with minimising the copper and iron losses of the IPMSM with due account of machine parameters variations and the voltage drop across the stator winding resistance. A new losses minimisation algorithm (LMA) which considers these issues is presented in this research. A comprehensive off-line simulation study based on this LMA is performed in order to evaluate the effect of the parameters variations, resistive voltage drop and iron losses on the IPMSM optimal efficiency operation. It is shown that the parameters variations and resistive voltage drop should be included in the losses minimisation to achieve IPMSM optimal efficiency operation. On the other hand, the minimum losses operation points are not significantly affected by the utilised IPMSM iron losses. The proposed LMA is implemented with non-linear look-up tables (LUTs) using the current commands developed for both constant torque and field weakening operations. Good matching between the simulation and experimental results has been achieved. Reducing the inverter switching losses is the aim of the second part of this PhD research in addition to decrease the common mode voltage (CMV) which may lead to undesirable motor bearing current and electromagnetic interference. A comparative study between up-to-date PWM techniques for CMV reduction with the conventional space vector PWM (SVPWM technique) through simulation studies are presented. Due to its advantages on reducing both the switching losses and CMV of the inverter over all (αβ) voltage hexagon modulation regions, the LuPWM technique is selected for the tested IPMSM drive. Firstly, the scalar implementation of this LuPWM technique using the sine triangle waveform modulation technique on a simulation model of a resistor-inductor (R-L) inductive load is validated with sinusoidal current waveforms. However, implementation of the LuPWM in the closed loop control system of the tested IPMSM drive results in a considerable unexpected distortion in the phase current waveforms especially at low demanded torques. A study on this issue shows that due to the unavoidable ripples on the electrical angle position information leading to the malfunction on determining the (αβ) voltage hexagon sectors, the sector transition point of the LuPWM pulses especially when the state of the LuPWM pulse is changed between On-state and Off-state is strongly affected. Consequently, the current waveforms for a closed-loop drive system under the LuPWM technique during the sectors transition period become seriously distorted. In this thesis, the LuPWM current waveforms distortion problem is proposed to be addressed by modifying the pulse pattern of the traditional LuPWM technique around the (αβ) voltage hexagon sectors transition points associated with significant current waveforms distortion as aforementioned. Under this proposed PWM technique denoted as Mod-LuPWM technique, the switching state of each LuPWM pulse is suggested to be hold for an optimum small period around each transition period. Hence, the adverse effects of the angular ripple and the voltage error will be evened out between the “Turn-On” and “Turn-Off” transitions. Therefore, sinusoidal current waveforms can be obtained for closed-loop drive system under the proposed Mod-LuPWM. In addition, similar to the traditional LuPWM the Mod-LuPWM technique own the ability of on reducing the peak-to-peak common mode voltage value to one sixth of the DC-link voltage compared with the traditional PWMs. On the other hand, due to its switching characteristics, the switching losses of the drive system under the Mod-LuPWM technique are also reduced by one third during the switching period leading to an increase on the switching device life-time. Furthermore, as its implementation does not require any additional hardware, the proposed Mod-LuPWM can be employed for any existing drive system without any increase in the total drive cost. The proposed Mod-LuPWM has been validated with well-matched between simulation and experimental results showing significant current waveform improvements and considerable CMV reduction.
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Koc, Mikail. "Efficiency optimised control of interior mounted permanent magnet machines for electric vehicle traction." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15880/.
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Electric vehicles (EV) are playing a momentous role to the wide society as they facilitate the use of clean energy technologies. Interior mounted permanent magnet (IPM) synchronous machines are commonly employed in EVs owing to their superior characteristics such as high efficiency and power density and a wide field weakening operating range. High efficiency motor operation extends EVs drive range with the same amount of energy. Advanced control techniques to achieve high efficiency operation and smooth output torque production are, therefore, highly important areas to be researched. This thesis deals with the state-of-art motor drives and further develops advanced control strategies for minimum loss operation with good torque control quality. Modern AC drives can be classified in two groups, viz., field oriented control (FOC) and direct torque control (DTC). Whilst the former controls the phase currents for torque realization, the latter controls the torque directly. This thesis researches both and the novel advanced techniques are underpinned by extensive simulations and supported by experimental validations on a prototype motor designed for a specific class of EVs. The biggest challenge associated with the FOC drives is to improve the efficiency due to highly nonlinear characteristics of IPM machines. It has been discovered that even if the machine parameters are accurately modelled and stored in controllers to achieve optimal efficiency operation in a great number of FOC based IPM drives, there is still much deviation from the ideal operating points. A novel approach for online efficiency optimisation is proposed and comprehensively analysed in this thesis. The challenges pertinent to the DTC based IPM drives are to improve the observer quality and to reduce the strong coupling and the nonlinearity in the control loops. Novel observer structures, and the decoupled and linearized control techniques are among the novel contributions for DTC drives in this thesis. In addition, a comprehensive analysis of the relationship between stator flux vector and the torque has not been performed in the literature. The detailed analysis is made in this thesis and the maximum torque per voltage (MTPV) control theory for DTC drives is introduced. It is noteworthy that this thesis is based on comparative studies between the state-of-art and the proposed techniques throughout, and hence offers an insightful understanding for modern IPM drives.
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Ge, Xiao. "Investigation of interior permanent magnet machines and variable reluctance resolvers accounting for manufacturing issues." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12393/.
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Prins, Michiel Hendrik Albertus. "Design of a field-intensified interior permanent magnet synchronous machine for electric vehicle application." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86242.
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Thesis (MScEng)--Stellenbosch University, 2014.ENGLISH ABSTRACT: The focus of this thesis is on the optimal design and evaluation of FI-PM machines to be used with a MG transmission drive-train for EV application. The machines presented are optimised using a gradient-based optimisation algorithm of the VisualDoc software together with FE software and Python scripts. Each machine is optimised for its own objective function. The focus is to reduce expensive rare earth material. High torque ripple issues of the optimised machines are solved by implementing a relatively new topology where the rotor poles/barriers are made asymmetric. The asymmetric rotor topology implemented is effective and can be used as an alternative for rotor stack skewing. PM demagnetisation and rotor deformation studies are conducted on the optimum designed machines to ensure that no PM demagnetisation on the surface of the PMs and critical rotor deformation occur. The FE performance results of the optimum designed machines are shown and discussed. One of the optimum designed FI-PM machines is manufactured and tested in the laboratory. The FE and measured results of the machine are compared and shows good correlation. The saliency performance of the optimum designed machines are evaluated as it determines its position sensorless control capability. It is shown that the saliency ratios increase linearly with load, making it favourable for position sensorless control. It is also shown that the asymmetric rotor topologies introduced a larger mutual inductance compared to their symmetric counterparts, thus higher cross-coupling is present in these rotors and therefore a higher saliency shift, which is undesirable. Two case studies are performed in order to improve saliency performance. The objective of the first case study is to improve the saliency shift by reducing the flux leakage paths in the rotor. The objective of the second case study is to optimise a FI-PM machine in order to improve the saliency ratio and -shift. The results of the two case studies are compared with the saliency performance of the other machines.
AFRIKAANSE OPSOMMING: Die fokus van hierdie tesis is op die optimale ontwerp en evaluering van veld versterking permanente magneet masjiene vir veelvoudige-rat elektriese voertuig toepassings. Die masjiene teenwoordig is geoptimeer met behulp van ’n helling-gebaseerde optimering algoritme. Elke masjien is geoptimeer vir sy eie doel funksie. Die fokus is om duur seldsame permanent magneet materiaal te verminder. Hoë wringkrag-rimpeleffek van die optimale masjiene word opgelos deur die implementering van ’n relatief nuwe topologie waar die rotor pole/vloedbarrière asimmetries gemaak word. Die asimmetriese rotor topologie wat geimplementeer is, is effektief en kan dus as ’n alternatief vir die rotor stapel skeef metode gebruik word. Permanent magneet demagnetisering en rotor vervorming studies is ook uitgevoer op die optimum ontwerpte masjiene om te verseker dat geen demagnetisering plaasvind nie en ook geen kritiese rotor vervorming nie. Die eindige-element resultate van die optimum ontwerpte masjiene word getoon en bespreek. Een van die optimum ontwerpte veld versterking permanente magneet masjiene is vervaardig en getoets in die laboratorium . Die eindige-element en gemete resultate van die masjien word vergelyk en toon goeie korrelasie. Die speek prestasie van die optimum ontwerpte masjiene word geëvalueer aangesien dit die sensorlose posisie beheer vermoë bepaal. Daar word getoon dat die speek koëffisiënt verhoog lineêr met vrag wat dit gunstig maak vir posisie sensorlose beheer . Daar word ook gewys dat die asimmetriese rotor topologie ’n groter wedersydse induktansie het in vergelyking met hul simmetriese eweknieë, dus is daar hoër kruis-koppeling teenwoordig in die rotors en dus ’n ho¨er speek skuif, wat ongewens is. Twee gevallestudies om speek prestasie te verbeter is uitgevoer. Die doel van die eerste gevallestudie is om die speek skuif te verbeter deur die vermindering van die vloed lekkasie paaie in die rotor. Die doel van die tweede gevallestudie is om ’n veld versterking permanente magneet masjiene te optimeer ten einde die speek koëffisiënt en - skuif te verbeter. Die resultate van die twee gevallestudies word vergelyk met die speek prestasie van die ander masjiene.
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Lin, Ruiyang. "A Design Paradigm for V-shape Interior Permanent-magnet Machines Using Multi-objective Optimization." Thesis, Purdue University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10272940.
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Interior Permanent-magnet Machines (IPMs) have seen wide usage in industry due to their robustness, high efficiency, and low manufacturing cost. Among various IPM topologies, V-shape IPMs have been claimed to exhibit higher power densities. However, designing an IPM has been a challenging task due to the complexity of the rotor structure and magnetic saturation. The objective of this work is to set forth a rigorous design paradigm for V-shape IPMs based on multi-objective optimization. The proposed approach aims to address the multi-disciplinary nature of the design process by incorporating electromagnetic, structural, and thermal analyses. The electromagnetic analysis combines the advantage of an analytical field solution and a magnetic-equivalent-circuit (MEC) approach so it is both computationally efficient and is able to address magnetic nonlinearity in the rotor. The structural analysis uses static stress/strain methods to compute the stress distribution within critical regions in the machine. A thermal analysis based on thermal-equivalent-circuit (TEC) is proposed and the impact of including the thermal analysis on the machine metrics is discussed. Using the proposed approaches, the computational cost is significantly reduced compared to traditional FEA methods. A multi-objective design paradigm incorporating relevant design constraints is set forth. A performance comparison between IPMs and SPMs is conducted for a 2.5-hp motor application.
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Ponziani, Stefano. "Design and development of a synchro-reluctant interior permanent magnet motor (IPM), low voltage application." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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The work carried out in this paper was born with the aim of designing, developing and testing a low voltage electric motor for automotive application and naval traction.
The motor is a synchro-reluctant interior permanent magnet motor (IPM).
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Soong, Wen Liang. "Design and modelling of axially-laminated interior permanent magnet motor drives for field-weakening applications." Thesis, University of Glasgow, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320328.
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Sun, Tianfu. "Efficiency optimised control of Interior Permanent Magnet Synchronous Machine (IPMSM) drives for electric vehicle tractions." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13610/.
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Gao, Feng. "Interior Permanent Magnet Synchronous Motor Demagnetization Fault Modeling and Analysis by Using Dynamic Phasors Model." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27473.
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Interior permanent magnet synchronous motor (IPMSM) has been widely used in hybrid electric vehicles (HEVs) since the high power density and efficiency. However, the primary drawback of IPMSM is the demagnetization phenomenon caused by the permanent magnets. Modeling of the demagnetization fault are important in developing and designing a protection system for the traction on HEVs, thus, an efficient and accurate IPMSM model for demagnetization fault simulation is necessary. By using the conventional dq0 IPMSM model, the current indicators of demagnetization fault are affected by noise which will cause inaccuracy of the simulation. For this reason, a dynamic phasors model of IPMSM is presented in this thesis. In this thesis, firstly, the dynamic phasors model of IPMSM is verified by using small-signal transient analysis for its stability. Secondly, the time-domain transient simulations of positive sequence currents are shown and compared to the conventional dq0 model with demagnetization fault.
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Khan, Kashif Saeed. "Design of a Permanent-Magnet Assisted Synchronous Reluctance Machine for a Plug-In Hybrid Electric Vehicle." Licentiate thesis, KTH, Elektrisk energiomvandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-50595.
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Azar, Ziad. "Electromagnetic performance of fractional slot interior permanent magnet and synchronous reluctance brushless AC machines having non-overlapping concentrated windings." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2839/.
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This thesis investigates the electromagnetic performance of the fractional-slot interior permanent magnet (IPM) and salient-pole synchronous reluctance (SynR) brushless AC machines having non-overlapping concentrated windings, the SynR machines being excited by bipolar AC sinusoidal currents with and without DC bias. The analyses are validated by finite element calculations and measurements. The PM machines with modular stators are often employed to improve the electromagnetic performance and ease the manufacture process, particularly stator winding. The influence of uniform and non-uniform additional gaps between the stator teeth and back-iron segments on the electromagnetic performance of fractional-slot IPM machines having either un-skewed or step-skewed rotors and different slot openings, viz. open slot, closed slot and hybrid slot (sandwiched open and closed slots), is investigated. The influence of load conditions on cogging torque and back-emf waveforms and the effectiveness of rotor skew on the minimization of the cogging torque, thus the torque ripple, are also examined. It is found that the additional gaps have a negligible influence on the average output torque, but significantly increase the cogging torque magnitude, while their non-uniformity can cause a large increase in both the peak and periodicity of cogging torque waveform, which in turn makes the skew method ineffective. The magnetic cross-coupling level and the sensitivity of cogging torque to manufacturing limitations and tolerances strongly depend on the slot opening materials. The cogging torque magnitude is significantly increased by load, while its periodicity also changes with load which makes the rotor skew less effective unless the machine is skewed by one cogging torque period on load. The electromagnetic performance of the SynR machines under AC sinusoidal bipolar excitation with and without DC bias is investigated and compared for three different winding connections, such as asymmetric, symmetric and hybrid. In general, the SynR brushless AC machines with DC bias excitation exhibit significantly higher torque density than those without DC bias. Comparing with the asymmetric and symmetric winding connections, their hybrid counterpart results in significantly larger mutual inductance variations. Consequently, it results in significantly larger output torque, since such torque is produced by the variation of both the self and mutual inductances. In terms of torque ripple, the symmetric winding connection leads to the best performance. On the other hand, at significantly larger current densities, the hybrid winding connection become more suitable, since it exhibits large average output torque and relatively low torque ripple.
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Goksu, Omer. "Shaft Transducerless Vector Control Of The Interior Permanent Magnet Motor With Speed And Position Estimation Using High Frequency Signal Injection And Flux Observer Methods." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609617/index.pdf.
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In this thesis, shaft transducerless vector control of Interior Permanent Magnet (IPM) motor with speed and position estimation using saliency based high frequency signal injection and fundamental model based flux observer methods will be investigated. The magnetic saliency characteristic of a 2.2-kW IPM motor will be experimentally extracted by means of high frequency signal injection. High frequency signal injection method will be used to estimate the speed and position at zero and low speed based on the magnetic saliency of the IPM motor. At high speed, fundamental model based flux observer method will be utilized for speed and position estimation. Seamless transition between the two estimation methods will be provided. Using the estimated speed and position information, the motor will be closed loop vector controlled and the drive motion performance over wide speed and load range will be investigated. The IPM motor drive and the estimation/control algorithms will be modeled and their performance will be demonstrated by detailed computer simulations. A three-phase voltage source inverter and a motor test bench will be built, and the estimation/control algorithms will be implemented on a DSP based motor control platform. The IPM motor drive system will be tested in the laboratory and the theory and simulation results will be verified by the experiments.
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Molaoa, Molaoa. "Development of a converter for grid-tied and isolated operation of an interior permanent magnet synchronous generator, coupled to a twin-shaft gas turbine." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29412.
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South Africa’s overreliance on coal fired power generation has led to the government’s commitment to diversifying the country’s energy mix. Gas turbine generators are poised to play a larger role in South Africa’s energy mix, due to the country’s abundance in natural gas reserves. Therefore, there is a need to developed gas turbine emulation systems to investigate how this transition is to be implemented and to discover new efficient ways to generate power through gas turbines. This thesis presents the development of a twin-shaft gas turbine emulator. A DC-machine that accepts both torque and speed references is used to emulate the behaviour of the gas turbine according to a modified Rowen gas turbine model. The emulator is coupled to a 1.5kW interior permanent magnet synchronous generator (IPM). The power density of a DC-machine is significantly lower than that of a gas turbine of the same rating. Thus, the DC-machine is rated at double the rating of the IPM to overcome the high inertia it has when compared to a gas turbine of the same rating. This means that the DC-machine can produce large toques to successfully emulated the dynamic behaviour of the gas turbine. A maximum error 2.5% in the emulation of the gas turbine’s speed is reported. A two-level active converter is used to compare control strategies for an IPM. Ninety-degree torque angle (NTA) control, maximum torque per ampere (MTPA) control and unity power factor (UPF) control are compared for performance. The UPF and MTPA control result in the lowest and second lowest DC-link utilisation respectively when compared to NTA control. This is due to a negative d-axis current component as opposed to a zero d-axis current component in the case of NTA control. It is also concluded that to achieve a high power factor and torque development, a negative d-axis current component is required. UPF and MTPA control perform well in both categories, with UPF control and MTPA control resulting in the highest power factor and developed torque respectively. A fourth control strategy that maximises the efficiency of the IPM is developed experimentally. The maximum efficiency (ME) control strategy minimises mechanical, core, windage and conduction losses. It also results in near unity power factor and near maximum developed torque. A nonconventional control structure that involves control of the DC-link from the generatorside converter is presented. This frees the outer-loop control of load-side converter to regulate voltage across the load when the system is supplying power to an isolated load. This control structure also allows the grid-side converter to employ reactive power compensation, without having to regulate the DC-link voltage at the same time. In doing so, large grid currents are avoided. A recursive least squares (RLS) algorithm is used to separate negative and positive sequence current components during grid voltage unbalance. A method to minimise the presence of negative sequence components in the load current is presented and implemented successfully in an experiment.
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Byrtus, Jiří. "Simulace pohonu hybridního automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219922.
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This thesis deals with analysis of electric drive parts from hybrid electric vehicle, namely interior permanent magnet synchronous motor and inverter with control. First part describes a basic theory. Further, motor and inverter computer models are shown, specified simulations are performed on this models. Results are compared with values measured on real machines from accessible literary sources.
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Maria, Daniel de Figueiredo. "Controle linear de maximo torque do motor sincrono de imãs permanentes interiores." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261361.
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Orientador: Edson BimDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-14T09:27:11Z (GMT). No. of bitstreams: 1 Maria_DanieldeFigueiredo_M.pdf: 3444109 bytes, checksum: 34912440efabb8d8fa3417e2f0c89c4f (MD5) Previous issue date: 2009
Resumo: Neste trabalho é apresentado o controle linear de máximo torque de um motor síncrono de ímãs permanentes interiores funcionando nas regiões de torque constante e potência constante. Na região de torque constante utiliza-se uma estratégia de controle baseada na curva de máximo torque por Ampére do motor e na região de potência constante implementa-se uma estratégia de enfraquecimento de campo que visa manter a tens~ao terminal de estator constante através do controle da reação de armadura. Para melhorar a resposta dinâmica do controle de torque na região de potência constante define-se uma faixa de velocidade intermediária, denominada região de enfraquecimento parcial, na qual estende-se o controle pela curva de máximo torque por Ampére. Resultados de simulação e experimentais são obtidos com o objetivo de avaliar os métodos de controle propostos.
Abstract: In this work is presented the linear maximum torque control of an interior permanent magnet synchronous operating in the constant torque and field weakening ranges. The constant torque control is implemented by using the maximum torque per Ampére curve of the motor. The terminal stator voltage remains constant along the field weakening range due to the armature reaction control. In order to obtain a better dynamic response, the maximum torque per Ampére control is extended up to the field weakening range, in an intermediate region, called partial field weakening region. Experimental and simulation results are presented in order to validate the proposed torque control methods.
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica
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Chang, Shih-Meng, and 張世孟. "Design and Analysis of Interior Permanent Magnet Motors." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/76494674864008556747.
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碩士逢甲大學
電機工程學系
89
The purpose of this thesis is to design and analysis interior permanent magnet (IPM) synchronous motors for adjustable-speed applications. To provide satisfactory engineering information but at small computational effort, a combination of the magnetic circuit model and the finite element analysis is employed. In the first part of this thesis, a design procedure of the IPM synchronous motors is developed. It has been used to design a prototype motor for use in this study. Then the magnetic circuit model taking into account leakage flux paths around the magnets in the rotor for an IPM synchronous motor has been presented. The analytical expressions of the magnetic field quantities in terms of the reluctance ratio and the leakage flux ratios provide the solutions in extremely short times. Each field quantity of the model can be evaluated directly from the dimensions and material properties of the motor and thus can be easily and suitable incorporated into the motor magnetic design. The finite element field analysis is employed to verify the accuracy of the magnetic circuit model and to refine the prototype design. The prediction of the performance of the designed motor using the finite element method is also described. The cogging torque, torque, open circuit EMF and air gap flux density are obtained. Especially, the reactances are obtained as a function of current.
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Tsai, Pei-li, and 蔡配醴. "Design and Analysis of Brushless Interior Permanent-Magnet Motors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98067754488502326856.
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碩士國立雲林科技大學
機械工程系碩士班
101
The purpose of this study is to investigate the structural geometry, electromagnetic field, and design process of brushless interior permanent-magnet (IPM) motors. Typical configurations and winding layout of brushless IPM motors with exterior rotors are introduced first. The equivalent magnetic circuit model of a brushless IPM motor with an exterior rotor is then established to calculate the magnetic flux density within the air gap, while verified by the finite-element analysis (FEA). A design process, including the magnetic circuit design, electric design, and detail design, is proposed for the implementation of a brushless IPM motor. A design example with 500W, 3-phase, 18-slot/12-pole brushless IPM motor with an exterior rotor configuration is presented. By comparing with a traditional SPM motor with identical volume of permanent magnets, the electromagnetic torque of the IPM motor is reduced by 17.4%, while the torque ripple is reduced by 81%.
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CHANG, YOUNG-HO, and 張永和. "Development of a Small Interior Permanent Magnet Brushless Motor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/rgg754.
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碩士國立高雄應用科技大學
機械與精密工程研究所
104
This research developed two interior permanent magnet brushless motors for small power applications. The small PM brushless motors mostly used surface-mounted design in the market. However, interior and inset motors can generate additional reluctance torque and have better magnetic energy density. This thesis demonstrated interior motors can meet performance of existing motors with less permanent magnet volume. This study chose I-type and spoke-type interior motor designs because cuboid magnets are easy to produce with low cost. The inset motor uses more expensive arcuate magnets in comparison. The magnets of the interior motors are also easy to assembly. The spoke-type motor proposed in the thesis can reach or exceed the performance of the inset motor. Considering ease of manufacture motor design should choose low number of poles and slots. For 4-pole and 6-slot design the inset motor has larger torque and lower ripple than the interior motors. For 6-pole and 9-slot design the spoke-type interior motor has better performance than the inset motors. The 6-pole and 9-slot design has much larger torque than the 4-pole and 6-slot design but add higher production cost. The 6-pole and 9-slot spoke-type interior motor design is selected and made for this research. Both I-type and spoke-type interior motors are successfully designed, manufactured and tested. The motors have a stator outer diameter of 15 mm, rotor outer diameter of 7.5 mm, and length of 5 mm. The spoke-type interior motor achieved maximum speed of 16,600 rpm and highest torque of 3.31 mN-m at 1A single-phase excitation. In the future, this small motor can be applied to motor vehicles, unmanned aerial vehicles, and robots.
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Chia-ChengKu and 古佳正. "A Regenerative Braking System for Interior Permanent Magnet Motor." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/cahh35.
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ThaiHao, Nguyen, and 阮太豪. "Design of 10kW Interior Permanent Magnet Motor for EV Traction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/09275088838333328265.
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碩士國立成功大學
系統及船舶機電工程學系
104
This thesis presents the design and analysis of 10 kW interior permanent magnet synchronous motor (IPMSM) applied to electric vehicle traction. Permanent magnet synchronous motors, especially the IPMSM has been widely used in electric vehicle (EVs) due to their benefits of high efficiency, high power, and torque density. The theoretical and practical limitations to the field-weakening performance of the IPMSM are first examined. The IPMSM is then analyzed and designed using magnetic circuit model. Different rotor configurations are designed under the same stator frame and the same volume of permanent magnets. Their performance is simulated using JMAG and compared. The torque constitutions, i.e, the magnet torque and reluctance torque, of these designs are also discussed so that the distinction between IPMSM and permanent magnet assisted synchronous reluctance motor can be clarified. Finally, one of the designs is prototyped and verified by experiments.
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Sue, Shinn-Ming, and 蘇信銘. "LINEAR TORQUE CONTROL OF INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVES." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/29907446657538165130.
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博士國立清華大學
電機工程學系
92
In this dissertation, new torque control strategies for interior permanent magnet synchronous motor (IPMSM) drives are proposed to fully exploit the reluctance torque as well as to preserve the merit of the simple linear torque control scheme. Main contributions of the dissertation are summarized as follows. Firstly, a novel linear torque control strategy is presented for IPMSM drives in the constant torque limit region such that the resulting torque is proportional to the line current magnitude. A sufficient condition for the existence of the linear torque control is derived and the corresponding torque constant is also maximized. In addition, a closed form relation between the and for the proposed torque control strategy is derived. Not only can the proposed linear torque control strategy fully exploit the reluctance torque to provide a much wider constant torque operation region, but also provide a much better performance at high speed region as compared with that of the surface mounted PMSM. Secondly, a new field weakening control of a linear torque controlled IPMSM drive is presented. The proposed control further extends the operational speed range of the previous linear torque control (LTC) from the constant torque limit range to the field weakening range such that the IPMSM drive can operate over much wider speed range. The theoretical basis of the proposed field weakening control is first proposed and the corresponding analytical forms are also derived. The entire operational regions of an IPMSM are divided into three regions according to the motor speed, namely the constant torque limit region (Region I), the partial field weakening region (Region II), and the full field weakening region (Region III). However, only two control modes, namely the constant torque limit control mode and the field weakening control mode, are required. A region detector is proposed to choose the correct control mode efficiently according to the motor speed and the demanded torque. In addition, to fully utilize the maximum torque capability in the field weakening region, a variable line current magnitude limiter is also proposed to simplify the complexity of the control algorithm. Thirdly, a linear maximum torque per ampere (LMTPA) control is proposed for IPMSM drives to further minimize the copper loss during the steady state operation as well as to achieve fast transient response. The proposed LMTPA is also extended to the entire field weakening region to achieve full range maximum torque per ampere control. Sound theoretical basis is also provided in the context. Finally, a new saturated q-axis flux linkage model for an IPMSM is proposed and the corresponding LMTPA control strategy over the full operational speed range is derived. Experimental results are provided to show the improvements of the dynamic as well as the steady state performances for these proposed linear torque control strategies.
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CHANG, LIN CHUN, and 林俊昌. "Design, Analysis and Measurement of Interior Permanent-Magnet Synchronous Machines." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/13902414066731816578.
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碩士國立臺灣科技大學
電機工程系
92
Abstract This thesis presents the design, analysis, and measurement of an interior permanent-magnet synchronous machine. The two-dimension finite-element field analysis program FLUX2D is employed to verify the accuracy of the magnetic circuit model and refine the prototype design. In this machine, the mathematical model is derived and then referred to synchronous frame in order to estimate the parameters. An interior permanent-magnet synchronous machine with eight-pole of rotor and nine-slot of stator is used as an example. The performance of this machine is first simulated by FLUX2D. The results indicate that d-axis inductance is 0.03988mH and q-axis inductance is 0.0229mH with 290W capacity. Then, an AD/DA servo control card is used to sample the voltage and current signals and calculate the values of d-axis and q-axis inductances when the machine is operated as a generator. The results show that d-axis inductance is 0.0372mH and q-axis inductance is 0.00236mH. In addition, the experiments of the machine with a three-phase diode rectifier circuit and its DC load are given to justify the analysis.
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Chen, Yueh-Tung, and 陳岳東. "Analysis of Cogging Torque of Brushless Interior Permanent-Magnet Motors." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/99430570662464787431.
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碩士國立雲林科技大學
機械工程系
102
Brushless permanent-magnet motors have many advantages, such as small volume and high output torque. But it also brings the vibration problems that come along with a higher cogging torque. This study focuses on the cogging torque reduction of brushless interior permanent-magnet motors. We design the geometric parameters of brushless interior permanent-magnet motors by Taguchi method, in order to eliminate the cogging torque. We first introduce the characteristics of brushless interior permanent-magnet motors. Then, we derive the cogging torque formula, verified by the finite element analysis software. And, we discuss four parameters that influence the cogging torque, and make these geometric parameters to be the control factors by using Taguchi method, then complete the optimization. As a result, the cogging torque of the re-designed motors declines 80.6%, and the torque ripple drops 31.5% by comparing to the original motors. On the contrary, the electromagnetic torque decreases 16%. The proposed interior permanent-magnet motors with low cogging torques and torque ripples are applicable to high precision and low vibration circumstances.
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Lin, Chi-Hui, and 林錦輝. "Interior Permanent-Magnet Brushless Motor Optimization Design and Computer Analysis." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/75425001393701249788.
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碩士大葉大學
電機工程學系碩士在職專班
95
Permanent magnet brushless DC motor(abbreviated PM BLDCM) has been extensively used in recent years. Interior permanent magnet brushless DC motor has high strength structure. The magnet would not break away if high speed operating condition. Rotor (non-concentric), to increase the motor torque output, besides the electromagnetism torque which produces by magnet and coil affect mutually and magnetic resistance torque which produces by saliency effect, But it’ll occur cogging torque. This purpose of this article is for analyzing the interior permanent magnet brushless DC motor. We could use utilizing the finite element method to analyzing the cogging torque and change the motor size for achieves the optimization.
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Yi-HsuanLu and 呂怡萱. "Direct Torque Control for Interior Permanent Magnet Motor with SVPWM." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/fqxn3w.
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I-HsuanWu and 吳懿軒. "Sensorless Direct Torque Control Applied to Interior Permanent Magnet Motor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/g2s326.
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Liaw, Chong-Zhi. "A high power interior permanent magnet alternator for automotive applications." Thesis, 2013. http://hdl.handle.net/2440/83587.
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This thesis examines the operation of a 6 kW interior permanent magnet machine as a generator and its use in conjunction with a switched-mode rectifier as a controllable current source. The interior permanent magnet machine was designed for optimum field-weakening performance which allows it to achieve a wide constant-power speed range. This configuration has possible applications in power generation, e.g. as an alternator in automotive electrical systems and in renewable energy systems such as small-scale wind turbines. The thesis starts from a study of the behaviour of the interior PM machine while generating into a three-phase resistive load and also through a rectifier into a voltage source load. Steady-state and dynamic d-q models are developed which describe the machine generation characteristics. The concept of the VI locus is introduced which provides insights into the generating performance of interior PM machines. In particular, the phenomenon of hysteresis in the current versus speed characteristic of highly salient interior PM machines is explained using the VI locus and for the first time is experimentally demonstrated. The steady-state and transient response of the 6 kW interior PM machine while operating with a switched-mode rectifier is modeled and experimentally measured, forming the basis for the design of a closed-loop controller to regulate the output voltage. The experimental performance and stability of the closed-loop system is examined and evaluated. Further improvements to the output power of the system at low speed using a switched-mode rectifier modulation scheme are investigated and a 66% improvement in output power from 2.8 kW to 4.7 kW is experimentally demonstrated.Thesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2013
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Chang, Chun-Yi, and 張浚溢. "Characteristics Comparison of Surface-Mounted and Interior Permanent Magnet Synchronous Motors." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/873am6.
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碩士逢甲大學
電機工程所
90
A comparative study of surface-mounted and interior permanent magnet synchronous motors with the same dimension was presented in this thesis. To have the same comparative conditions, a motor design program based on Visual Basic 6.0 was written and was employed to design the above motors. The magnetic circuit models for each motor were presented. Field quantities of the model can be easily obtained and incorporated into the motor magnetic design program. Prototypes of the motor were then designed. The performances of the prototype were predicted by conducting the finite element analysis. The quantities such as, no-load air gap flux density, open-circuit voltage, cogging torque and average torque were used for the comparison between the prototype motors.
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Liaw, Chi-Chieh, and 廖祈傑. "Performance Improvement and Sensorless Control for Interior permanent Magnet Synchronous Motor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/71735371688373405145.
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碩士國立清華大學
電機工程學系
90
Compared with other motors, the interior permanent magnet synchronous motor (IPMSM) possesses the advantages of high power density, excellent acceleration ability and low noise, etc, and it is gradually applied to industrial applications. The purpose of this thesis is to perform the operating performance improvement and the sensorless control for an IPMSM drive. In order to familiarize with the torque generating characteristics of an IPMSM, its structure and governing equations are first studied. The equivalent circuit parameters of an IPMSM are necessary for making the analysis and design of inverter-fed motor drive. However, they are difficult to obtain accurately via derivation owing to their nonlinear and variant properties. To solve this problem, the practical estimation approaches are developed. For performing the experimental tests, a DSP-based IPMSM drive is established, the necessary sensors, signal conditioners and control schemes are properly arranged to let it can be normally operated as a brushless DC motor (BDCM). As generally recognized, the dynamic performance of a motor is much affected by its winding current waveforms. A simple robust current controller is developed to improve the winding current tracking control response. As far as the tuning control for IPMSM drive is concerned, the effects of field excitation and commutation instant tunings on the IPMSM drive performances under speed open-loop and closed-loop conditions are first observed analytically and experimentally. The equivalence between these two types of tunings is derived. Then accordingly, an intelligent tuning approach is developed to automatically determine the advance of commutation instant. The minimum current command is achieved to obtain better torque generating capability equivalently. As to the sensorless control for the IPMSM, for avoiding the undesired noise effects caused by the time derivative in making the back electromotive force (back EMF) estimation, a sensorless control approach based on the sensed winding terminal voltage is proposed. The effects of phase difference between terminal voltage and back EMF and the driving performance improvement of the IPMSM drive will be covered by the proposed commutation tuning control. The starting and the speed estimation schemes for the sensorless IPMSM drive are also properly designed. Finally, the feasibility of uni-directional starting based on rotor initial position detection is studied. Effectiveness of all the control approaches developed in this thesis will be demonstrated experimentally.
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Hsu, Tzu-Ting, and 徐子庭. "Development of 31kW Interior Permanent-Magnet Synchronous Motor for Electric Vehicles." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/81908518781717505061.
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碩士國立臺灣大學
機械工程學研究所
98
The objective of this work is to design a high-performance traction motor for a battery electric vehicle “Green Jumper” engineered in National Taiwan University. An important challenge of traction motor design for electric vehicle is to meet the requirements of different types of electric vehicles and of easy-to-construct configuration that can contribute to the overall cost reduction for the electric vehicle. The interior permanent magnet (IPM) synchronous motor is the natural choice of such niche applications because of their higher efficiency, compact size and achieving constant-power operation over a wide speed range with limited magnet strength requirement. However, the cost of magnet material is high compared with the cost of the other materials used in electric motor, and design attributes that minimize the required amount of magnet material are important challenge for high-performance motor design. The placement of the embedded permanent magnet is developed for the optimized design of high-performance IPM motor. The IPM motor with segmented magnet is first investigated in terms of its field weakening capability. Furthermore, this thesis proposed a design with permanent magnets being embedded in the U-shape flux barrier compared to the V-shape flux barrier of TOYOTA Prius. The comparisons of the average torque and no-load back EMF are given. The results of the motor performance comparisons are based on comprehensive use of finite element analysis tools (JMAG-Studio). From the FEA results, it shows that the U-shape flux barrier proposed in this work has better torque capability than the V-shape flux barrier adopted in TOYOTA Prius; that is, for a given torque, the design with U-shape flux barrier can yield a smaller motor with less amount of magnet and contribute to the overall reduction of the material cost. A prototype motor was constructed on the basis of the final optimized design. The no-load back EMF and the torque performance were measured and compared with the predicted results for experimental verification. Finally, the measured performance analysis was found to closely match with the predicted results.
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Liaw, Shr-Shian, and 廖士賢. "Development of DSP-Based Sensorless Interior Permanent Magnet Synchronous Motor Drive." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/14806082751991121056.
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碩士國立清華大學
電機工程學系
91
Owing to its many remarkable advantages, the interior permanent magnet synchronous motor (IPMSM) is usually utilized as the actuator in many application fields. To further promote its application capability, some key technologies are developed in this thesis to improve the performance of a sensorless IPMSM drive. In order to profoundly understand the torque generating characteristics of an IPMSM, its structure and governing equations are studied first. The equivalent circuit parameters of a motor are necessary for performing its switching driving control. However, for an IPMSM they are not easy to obtain accurately via derivation owing to their nonlinear and variant properties. To solve this problem, the estimation approach is applied to find them alternatively. For performing the experimental tests, a standard DSP-based IPMSM drive is established. The DSP-based control environment possesses the capability of realizing all control schemes using digital control. As to the sensorless control for an IPMSM, the control approach based on the sensed winding terminal voltage is proposed for avoiding the undesired noise effects caused by the time derivative in making the back electromotive force (back-EMF) estimation, and the effects of phase difference between terminal voltage and back-EMF and the driving performance improvement of the IPMSM drive will be covered by the proposed commutation tuning control. A bumpless starting technique is devised in this thesis to let the motor start from the synchronous motor mode and smoothly switch to IPMSM sensorless running mode. In the tuning control for IPMSM drive, the equivalent performance of field excitation and commutation instant tuning is observed analytically and experimentally. Then accordingly, an intelligent tuning approach is developed to automatically determine the advancing angle of commutation instant. The minimum current command is achieved to obtain better torque generating capability equivalently. In dynamic control improvement, for improving the dynamic performance of the IPMSM drive, a simple robust current controller is developed to improve the winding current tracking control response. Incorporating with the commutation instant tuning, the winding current tracking performance under higher speeds can be further improved. Validity and effectiveness of the control approaches developed in this thesis are manifested and demonstrated experimentally.
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Lee, Jae Suk. "Deadbeat Direct Torque & Flux Control for interior permanent magnet synchronous machines." 2009. http://catalog.hathitrust.org/api/volumes/oclc/501327761.html.
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Dutta, Rukmi Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "A segmented interior permanent magnet synchronous machine with wide field-weakening range." 2007. http://handle.unsw.edu.au/1959.4/40878.
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Many high performance drive applications require wide Constant Power Speed Range (CPSR) for efficient use of energy. The examples of such applications are the starter alternator system of automobiles proposed for the 42V PowerNet, traction in the hybrid/electric vehicle, wind power generator etc. The Permanent Magnet (PM) machine is the natural choice of such niche applications because of their higher efficiency and compact size. However, the Surface Permanent Magnet (SPM) machine with sine distributed winding and radially-laminated Interior Permanent Magnet (IPM) machine with conventional structure has very limited or zero flux-weakening capability. The flux-weakening capability of the SPM machine can be improved by using concentrated, fractional-slot stator but here well-known advantages of the sine distributed winding are needed to be compromised. In the IPM machine, fluxweakening was improved using axial lamination and more than two magnet layers per pole. However, the construction of such IPM machine is complicated and expensive. This thesis presents design and analysis of a new type of the Interior Permanent Magnet (IPM) machine that have a very wide Constant Power Speed Range (CPSR) without compromising simplicity of construction and advantages of the distribution winding. In the new IPM machine, the magnet poles were segmented in the radially direction and the iron bridges between magnet segments provide for additional paths of flux-canalization to give the rotor an inherent capability of fluxweakening. Consequently, a very wide constant power speed range can be achieved in such machines. The proposed IPM machine of this work was referred as the Segmented IPM machine. The thesis focuses on the optimization of the Segmented IPM machine in a 42V environment of the automobile. First, for the conceptual evaluation a 4 pole, 550W Segmented Magnet IPM machine was optimized using finite element analysis. The parameters were calculated for prediction of the steady-state and transient performances. The torque- and power-speed capability were estimated using time-step, circuit-coupled finite element analysis. The cogging torque and variation of iron loss with frequency were also investigated during the design process. A prototype machine was constructed on the basis of the optimized design. The steady-state and transient performances of the prototype machine were measured and compared with the predicted results for experimental verification. The measured performance analysis was found to match very well with the predicted results. The measured torque- and power-speed capability of the Segmented IPM machine was also compared to those of a conventional, non-segmented IPM machine of similar rating and size. The thesis also presents the optimized design of a 6kW, 12 pole Segmented Magnet IPM machine for application in the Integrated Starter Alternator (ISA) of the electric/hybrid vehicle. It can be concluded from the predicted steady-state analysis of the 6 kW, 12 pole Segmented Magnet IPM machine that it should be able to satisfy most of the required criteria of an ISA with appropriate design optimization.
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Lee, Meng-Huan, and 李孟寰. "ESTIMATED BACK-EMF BASED POSITION SENSORLESS INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/79093693795604139024.
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碩士國立清華大學
電機工程學系
98
This thesis develops a motor drive system for condensing unit applications. The system consists of a position sensorless sinewave excited interior permanent-magnet synchronous motor (IPMSM) driven compressor, a square-wave excited surface mounted PMSM (SPMSM) driven fan, and a single-phase boost-type switch mode rectifier (SMR) front end to establish their common DC-link voltage from utility with satisfactory line drawn power quality. All the constituted power stages are fully digitally controlled in a common digital signal processor (DSP). For the compressor IPMSM drive, two types of sensorless control schemes based on the devised internal model based back-EMF estimators are developed and comparatively evaluated. As to the square-wave SPMSM fan drive, its position sensorless control is conducted based on the sensed motor terminal phase voltage. For these two types of PMSM drives, the proper commutation instant shifts are applied to enhance their driving performances, which may be deteriorated due to non-ideal sensorless controls, particularly under higher speeds. In addition, the smooth starting with less current transient is also considered. Finally, in the established single-phase boost SMR front-end, it possesses the inner hysteresis current-controlled PWM (H-CCPWM) scheme and outer voltage control loop. The simple robust control approach is applied to yield improved current and voltage control performances. Moreover, various types of the randomly varying bands for the H-CCPWM schemes are proposed, and their effects on the current harmonic spectral spreading characteristics and the SMR operating performance are observed experimentally.
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Hsu, Chieh-Yi, and 許潔一. "Magnetic Analysis and Synchronization Control of an Interior Permanent Magnet Synchronous Motor." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67067130974164827058.
Full textAbstract:
碩士大葉大學
電機工程學系
95
The content of this article can be divided into two parts. At first, the 4 poles and 24 slots interior permanent magnet synchronous motor used in this article will be performed with magnetic flux and finite element analysis so as to verify the characteristics of the motor. Meanwhile, two dimensional finite element software Maxwell 2D will be used to construct the magnetic flux analysis model for the motor, and the mathematical calculation software Matlab will be used to calculate the characteristic parameters of the motor. Finally, the above two results will be compared to the experimental values. In the second part of this article, a study of synchronized motion control of the motor is performed; the basic experimental architecture consists of two interior permanent magnet synchronous motors and motion control card and motor driver with the core of TMS320F243 digital signal processor (DSP) chip. At first, it will be started with the system identification of single axis motor, then the difference of system transfer function of double axis motor will be found out. Furthermore, individual PI controller will be designed and control strategy will be added in appropriate time so as to achieve the synchronized motion characteristic of the motor.
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ThanhAnh, Huynh, and 黃成影. "Design of an Interior Permanent Magnet Synchronous Motor for Electric Scooter Application." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/c55srr.
Full textAbstract:
碩士國立成功大學
系統及船舶機電工程學系
102
This thesis presents the design of an interior permanent magnet synchronous motor (IPMSM) for electric scooter (ES) application. The required ES can cruise for an average distance 100 km at 50 km/h or 60 km at 80 km/h in one charging time. Therefore, the ES requires a traction motor possessing high-power density, high efficiency, wide operating range and cost-effective. For these purposes, an IPMSM is designed and analyzed. Firstly, the dynamics behavior of ES is investigated. From this, the specifications of the electric motor such as torque, speed and power can be defined. Secondly, the IPMSM will be analyzed and designed using magnetic circuit model such that the saliency ratio can be improved for more reluctance torque. Different rotor structures are compared, such as single magnet layer type, multi-magnet layer type, and V-shape magnets type. The results are also compared with surface mounted permanent magnet type. Finally, all of the design cases are compared to determine the most suitable IPMSM for electric scooters. The design results are evaluated using finite element analysis.
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Bo-HengChen and 陳伯恒. "Design of Adjustable Hysteresis Direct Torque Control for Interior Permanent Magnet Motor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/s7x5a5.
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Pai, Tsung-En, and 白宗恩. "Comparisons between improved MTPA, MTPV and DTC for Interior Permanent Magnet Machine." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/tp2dv9.
Full textAbstract:
碩士國立臺灣大學
機械工程學研究所
107
This thesis proposes an on-line inductance estimation for interior permanent magnet synchronous motor (IPMSM) to maximize the torque output performance. On the basis, high frequency voltage injection is developed for on-line inductance estimation to improve the maximum torque per ampere (MTPA) control and the maximum torque per volt (MTPV) control performance. It is shown that the torque output is increased during the full load operation in an IPMSM under the flux saturation. Comparing to model-based inductance estimation, the proposed injection based inductance estimation achieve the higher torque output for IPMSM under both MTPA and MTPV. Instead of MTPA/MTPV based open-loop torque control, a direct torque control (DTC) is also developed to further improve the IPMSM drive performance through the torque closed-loop control. Different from conventional DTC schemes, this thesis develops a modified DTC scheme to be compatible with fixed frequency space vector pulse width modulation (SVPWM). More importantly, the flux and torque command are both determined real-time based on the analytical model. According to the experimental results, the proposed DTC achieves the better torque output than that under MTPA/MTPV with on-line inductance estimation. However, the parameter sensitive strongly limits DTC performance. Keywords: Direct torque control, inductance estimation, high frequency injection, IPMSM.
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Lee, Seong Taek. "Development and Analysis of Interior Permanent Magnet Synchronous Motor with Field Excitation Structure." 2009. http://trace.tennessee.edu/utk_graddiss/613.
Full textAbstract:
Throughout the years Hybrid Electric Vehicles (HEV) require an electric motor which has high power density, high efficiency, and wide constant power operating region as well as low manufacturing cost. For these purposes, a new Interior Permanent Magnet Synchronous Motor (IPMSM) with brushless field excitation (BFE) is designed and analyzed. This unique BFE structure is devised to control the amount of the air-gap flux for the purpose of achieving higher torque by increasing the air-gap flux at low speed and wider operating speed range by weakening the flux at high speed.
On the process of developing the new IPMSM, the following analysis results are presented. Firstly, a new analytical method of output torque calculations for IPMSM is shown. This method works well when using a 2-dimensional magnetic equivalent circuit of a machine by omitting the step of calculating the inductance values which are required for the calculation of the reluctance torque. Secondly, there is a research about the slanted air-gap shape. This structure is intended to maximize the ratio of the back-emf of a machine that is controllable by BFE as well as increase the output torque. The study of various slanted air-gap shapes suggests a new method to increase torque density of IPMSM. Lastly, the conventional two-axis IPMSM model is modified to include the cross saturation effect by adding the cross-coupled inductance terms for calculating the power factor and output torque in comparing different saturated conditions. The results suggest that the effect of cross-coupled inductance is increase when d-axis current is high on the negative direction.