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1
Gordon, B. M. "Small induction motor drives." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599532.
Testo completoAbstract (sommario):
Domestic appliances represent very cost conscious applications for drives where the emphasis is on achieving the optimum compromise between cost and performance. The requirements placed on a domestic appliance drive are so radically different from those demanded of an industrial drive, that a detailed re-evaluation of all the constituent sub-units of the drive must be undertaken. Domestic appliances are produced in large volumes so the use of a special arrangement or custom components can be justified if an overall benefit can be demonstrated. The work presented in this dissertation is concerned with small drives which are suitable for domestic appliances. A study of the optimal number of phases for current and possible future power electronic construction methods is presented and their suitability of domestic appliance drives considered. Comparisons based on material utilisation and the quality of the air gap flux waveform are presented. With the power electronic technology available two and three phase drives were found to be the best compromise between cost and complexity, and several drives of each type were built to provide experimental evidence on the performance of each alternative drive topology proposed. The experimental results obtained from the different drives built are related to the conclusions of work on inverter topology and phases number.
2
Chaudhary, Sumeet. "Lightweight Electromagnetic Induction Motor." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1581333548692675.
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3
Deib, Deib Ali. "Induction motor operation with series capacitance." Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183129403.
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4
Green, T. C. "Scalar controlled induction motor drives." Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/892.
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5
Memon, Niaz A. "Four quadrant induction motor controller." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260798.
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6
Flack, Timothy John. "Induction motor modelling using finite elements." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/7405.
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7
Hussein, Ali. "Interface issues in induction motor drives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ44877.pdf.
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8
Armstrong, G. J. "Encoderless vector controlled induction motor drives." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246112.
Testo completo
9
Manchen, Manfred Ludwig. "Shaded-pole flat linear induction motor." Thesis, Cape Technikon, 1990. http://hdl.handle.net/20.500.11838/1137.
Testo completoAbstract (sommario):
Thesis (Masters Diploma (Heavy Current)) -- Cape Technikon, 1991<br>Linear induction motors are built for numerous
applications. Their robustness, gearfree-link to the
load and the fact that speed is not a function of the
number of poles (as in round machines) are only a few
advantages. As every single phase motor needs some
starting aid, so does a linear induction drive. For
round machines, capacitors or shaded poles are usually
used. A capacitor can be damaged electrically, which is
a rare occurrence for shading rings. A useful
combination of these advantages is a linear induction
motor which is gearless and uses the shaded pole
principle as a starting aid.
In order to simplify the designing process, a computer
program (Fortran) was written. The main objective on
the electrical side was to obtain low input power, high
power factor and high efficiency.
In order to find the performance curves, torque
measurements were made. Although the principles of
torque measurements are well known the device to measure
torque for this machine was not available and had to be
constructed.
10
Esuri, Abdulhamid H. "Two-phase inverter/induction motor drive." Thesis, Loughborough University, 1991. https://dspace.lboro.ac.uk/2134/33109.
Testo completoAbstract (sommario):
Much interest is shown nowadays in the use of variable-speed ac motor drives in applications which previously have been the domain of the de motor supplied from a controlled rectifier or chopper. This interest is due mainly to improvements in semiconductor switching technology and the consequent increased reliability of the de-link inverter, together with the cost-effectiveness and the long-term reliability of ac machines, especially squirrel-cage induction motors. This thesis presents a recently developed form of variable-speed ac motor drive, comprising a 2-phase induction motor fed by a 2-phase inverter. A detailed mathematical model for the drive is developed and this is used to predict the dynamic and steady-state performance of a 300W experimental arrangement under various operating conditions and for both square-wave and sinusoidal PWM modes of operation. The validity and accuracy of the model are confirmed by the close agreement obtained in both shape and value between the experimental and predicted results. The harmonic content of the drive waveforms and the levels of torque and speed pulsations resulting from the inverter supply for both the square-wave and PWM modes of operation are evaluated, and the effects of load-torque and operating frequency variations on the drive performance are also considered. It is concluded in the thesis that this drive arrangement offers the advantages of relative simplicity, high reliability and little maintenance, and can provide a reasonably good performance and efficiency over a wide speed range. Consequently, it is a viable alternative for many variable-speed drive applications.
11
Bharadwaj, Aravind S. "Vector controlled induction motor drive systems." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172143/.
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12
Zhu, Chaoying. "Induction motor speed sensing and control." Thesis, University of Sussex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358985.
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13
Zhang, Pinjia. "Active thermal protection for induction motors fed by motor control devices." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34811.
Testo completoAbstract (sommario):
Induction motors are widely used in industrial processes. The malfunction of a motor may not only lead to high repair costs, but also cause immense financial losses due to unexpected process downtime. Since thermal overload is one of the major root causes of stator winding insulation failure, an accurate and reliable monitoring of the stator winding temperature is crucial to increase the mean time to catastrophic motor breakdown, and to reduce the extraordinary financial losses due to unexpected process downtime.
To provide a reliable thermal protection for induction motors fed by motor control devices, a dc signal-injection method is proposed for in-service induction motors fed by soft-starter and variable-frequency drives. The stator winding temperature can be monitored based on the estimated stator winding resistance using the dc model of induction motors. In addition, a cooling capability monitoring technique is proposed to monitor the cooling capability of induction motors and to warn the user for proactive inspection and maintenance in the case of cooling capability deterioration. The proposed cooling capability monitoring technique, combined with the proposed stator winding temperature monitoring technique, can provide a complete thermal protection for in-service induction motors fed by motor control devices.
Aside from online thermal protection during a motor's normal operation, the thermal protection of de-energized motors is also essential to prolong a motor's lifetime. Moisture condensation is one of the major causes to motor degradation especially in high-humidity environments. To prevent moisture condensation, a non-intrusive motor heating technique is proposed by injecting currents into the motor stator winding using soft-starters. A motor's temperature can be kept above the ambient temperature due to the heat dissipation, so that the moisture condensation can be avoided.
To sum up, active stator winding temperature estimation techniques for induction motors under both operating and de-energization conditions are proposed in this dissertation for both thermal protection and optimizing the operation of a motor system. The importance of these proposed techniques lies in their non-intrusive nature: only the existing hardware in a motor control device is required for implementation; a motor's normal operation is not interrupted.
14
Obiozor, Clarence Nwabunwanne. "Finite element analysis of a defective induction motor." Ohio University / OhioLINK, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1171672609.
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15
Mosskull, Henrik. "Robust Control of an Induction Motor Drive." Doctoral thesis, Stockholm : Automatic Control, School of Electrical Engineering, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3889.
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16
Smith, Andrew Neil. "Speed Sensorless Induction Motor Drives : A Comparison." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506428.
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17
Kibby, Devon. "Comparison of methodologies for induction motor design." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121549.
Testo completoAbstract (sommario):
In the last few decades, the world of electric machine design, specifically induction machine design, has been reinvigorated by the introduction of power electronics. Where designers were once limited to a single alternating current waveform with constant voltage and frequency, power electronics have thrown all those assumptions out the window. The change has necessitated new design methods that go beyond the typical induction motor electrical equivalent circuit seen in every textbook for the last century and have sent designers back to first principles. With that sentiment, early induction motor invention and improvements are explored. It is shown that even though the development and commercialization of the induction motor was quite rapid, the theory and understanding of the underlying physics kept pace. Basic design methodologies and tools, including the Hopkinson magnetic circuit and the Steinmetz equivalent circuit, from the so-called "'Golden Age' of induction motor development" are traced forward through textbook examples to support the claim. Newer electric machine analyses are presented in the form of the modern treatment of the magnetic equivalent circuit, MEC, and the finite element method, FEM. A derivation of the MEC element from the magnetic scalar potential is completed utilizing the theory of tubes and slices to give a more tangible justification to the field assumptions made. The knowledge from these assumptions is then applied to the FEM to show how to construct an MEC element using the FEM. Tellegen's theorem is applied to the MEC and a brief example given showing how one might compute the first-order sensitivity of a small change in stator windings in an induction motor to a small change in torque. A brief overview of the engineering design process is described with a focus on augmentation with computer aided design tools, CAD. The equivalence shown between the MEC and FEM is used to support the idea that a FEM-based electric machine CAD package could be modified to utilize MEC assumptions or knowledge in order to reduce computation time when coarser models are favored, such as in the early design stages.<br>Depuis les dernières quelques décennies, l'industrie de la conception de la machine électrique, spécifiquement la conception de moteur à induction, a été revigoré par l'introduction des électroniques de puissance. Là ou les concepteurs étaient jadis limités à un courant alternatif avec fréquence et voltage constant, l'électronique de puissance est venue compliquer les lignes directrices de la conception. Ces changements ont nécessité des nouvelle méthodes qui vont au-delà du circuit équivalent typique mentionné dans tous les livres de référence depuis le dernier siècle et ont reporté les concepteurs aux principes de base. C'est à partir de cette complication que l'évolution du moteur à induction depuis son invention est revisitée. Il a été démontré que, malgré son développement et sa commercialisation notablement rapides, la théorie du moteur à induction et notre compréhension des principes physiques ont suivi le rythme. Les méthodologies de base et outils de conception provenant du soi-disant âge d'or du moteur à induction, notamment le circuit magnétique Hopkins et le circuit équivalent Steinmetz, sont retracés dans les exemples à travers les livres de référence pour supporter la thèse. L'analyse des machines électriques actuelles est présentée sous la forme du circuit magnétique équivalent (MEC) moderne et par le calcul par éléments finis (FEM). Une dérivation du MEC à partir du potentiel magnétique vectoriel est réalisée en utilisant la théorie des tubes et tranches pour justifier les hypothèses concernant les champs électromagnétiques. Par la suite, ces hypothèses sont appliquées au calcul FEM pour démontrer la création d'un MEC à partir du calcul FEM. Le théorème de Tellegen est appliqué au MEC et un exemple concret est élaboré pour démontrer comment calculer la sensibilité de premier ordre entre un petit changement dans le bobinage électrique du stator et un petit changement dans le couple.Un bref aperçu du procédé de conception est apporté avec un focus sur la contribution des logiciels de conception assistée par ordinateur (CAD). L'équivalence démontrée entre la méthode du MEC et celle par le calcul FEM est utilisée pour soutenir l'idée que les logiciels CAD basés sur le calcul FEM pourraient être modifiés pour inclure les hypothèses apportées par le MEC dans le but d'économiser le temps de calcul lorsque, durant les étapes préliminaires de la conception, un modèle simple suffirait.
18
Johnson, Andrew P. (Andrew Peter). "High speed linear induction motor efficiency optimization." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/10945/11052.
Testo completoAbstract (sommario):
CIVINS<br>CIVINS<br>One of the reasons linear motors, a technology nearly a century old, have not been adopted for a large number of linear motion applications is that they have historically had poor efficiencies. This has restricted the progress of linear motor development. The concept of a linear motor as a rotary motor cut and laid out flat with a conventional rotary motor control scheme as a design basis may not be the best way to design and control a high-speed linear motor. End effects and other geometry subtleties of a linear motor make it unique, and a means of optimizing efficiency with both the motor geometry and the motor control scheme will be analyzed to create a High-Speed Linear Induction Motor (LIM) with a higher efficiency than what is possible with conventional motors and controls. This thesis pursues the modeling of a short secondary type Double-Sided Linear Induction Motor (DSLIM) that is proposed for use as an Electromagnetic Aircraft Launch System (EMALS) aboard the CVN-2 1. Mathematical models for the prediction of effects that are peculiar to DSLIM are formulated, and their overall effects on the performance of the proposed machine are analyzed.;3 |a(cont.) These effects are used to generate a transient motor model, which is then driven by a motor controller that is specifically designed to the characteristics of the proposed DSLIM. Due to this DSLIM's role as a linear accelerator, the overall efficiency of the DSLIM will be judged by the kinetic energy of the launched projectile versus the total electric energy that the machine consumes. This thesis is meant to propose a maximum possible efficiency for a DSLIM in this type of role.
19
Levett, D. B. "Analysis and control of an induction motor." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370346.
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20
Healey, Russell Cameron. "Advanced induction motor models for vector controllers." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337900.
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21
ZAMPERLINI, LEIDA. "INDUCTION MOTOR VELOCITY CONTROL BY SUBSYNCHRONOUS CASCADE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1987. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9839@1.
Testo completoAbstract (sommario):
Discute-se a modelagem de segunda ordem do acionamento
por
motor de indução de rotor bobinado usando cascata
subsíncrona e o controle de velocidade do mesmo. As
estratégias de controle habituais são criticadas e
propõe-se um controlador PI com realimentação
proporcional de
corrente. Propõe-se também um algoritmo de projeto
considerando as possibilidades de ajustes finais.<br>The second order modeling and speed control of the Wound
Rotor Induction Motor Drive using Subsynchronous Converter
Cascade are discussed. The usual control projects is
criticized, and a PI controller with current proportional
feedback, and also a algorthm for the design with
possibilities of final adjustments are presented.
22
Zhang, Yong. "A single-pulse cycloconverter induction motor drive." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260012.
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23
Chi-Kwong, Luk Patrick. "The transputer control of induction motor drives." Thesis, University of South Wales, 1992. https://pure.southwales.ac.uk/en/studentthesis/the-transputer-control-of-induction-motor-drives(c1a20165-02d4-43d8-b1d8-039cdb1e471e).html.
Testo completoAbstract (sommario):
The inherent advantages of the induction motor in variable speed drive applications can now be realised in a cost-effective manner as a result of recent advances in power electronics and microelectronics. This thesis is devoted to the advancement of the use of induction motors in variable speed applications, and describes the analysis, simulation and implementation of a variable speed induction motor drive. The state-space method lends itself as an ideal approach both for digital computer modelling and design of modem controller and was therefore adopted for the analysis and simulation of the drive system. The simulation was developed by means of a low cost personal computer package called MATLAB that has been designed to facilitate matrix operations. The use of such a specialized software package provided a 'user-friendly' operating environment with error messages identifying problem areas during program development. The resulted computer model of the drive system offers high flexibility and modularity and can be readily incorporated into further analysis and real-time controller design. Experimental results of the drive demonstrated good correlation with the model at both steady and transient states and the validity of the model is therefore confirmed. The experimental drive system was developed by means of transputers and its associated programming language occam. It was a flexible and comprehensive drive system comprising: (i) an on-line user interactive environment facilitated by the Transputer Development System; (ii) a 3-phase inverter bridge as the power conditioning unit; and (iii) a signal processing unit by means of a multi-transputer network system. The adoption of the transputer and occam enabled parallel processing to be achieved cost effectively in the drive system. The specifications of the drive system developed included on-line speed change, dynamic braking and programmable soft-start. Vector-control was also incorporated for good dynamic response. Experimental results of the specified functions of the drive are provided to confirm the proposed specifications of the drive. Further research areas on the present system are proposed, so that a viable industrial implementation may be contemplated.
24
Stefani, Andrea <1976>. "Induction Motor Diagnosis in Variable Speed Drives." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2311/1/Stefani_Andrea_Tesi.pdf.
Testo completoAbstract (sommario):
Several diagnostic techniques are presented for the detection of electrical fault in induction motor variable speed drives. These techinques are developed taking into account the impact of the control system on machine variables and non stationary operating conditions.
25
Stefani, Andrea <1976>. "Induction Motor Diagnosis in Variable Speed Drives." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2311/.
Testo completoAbstract (sommario):
Several diagnostic techniques are presented for the detection of electrical fault in induction motor variable speed drives. These techinques are developed taking into account the impact of the control system on machine variables and non stationary operating conditions.
26
Parveen, Tania. "Composite load model decomposition : induction motor contribution." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/31301/1/Tania_Parveen_Thesis.pdf.
Testo completoAbstract (sommario):
In this thesis, a new technique has been developed for determining the composition of a collection of loads including induction motors. The application would be to provide a representation of the dynamic electrical load of Brisbane so that the ability of the power system to survive a given fault can be predicted. Most of the work on load modelling to date has been on post disturbance analysis, not on continuous on-line models for loads. The post disturbance methods are unsuitable for load modelling where the aim is to determine the control action or a safety margin for a specific disturbance. This thesis is based on on-line load models. Dr. Tania Parveen considers 10 induction motors with different power ratings, inertia and torque damping constants to validate the approach, and their composite models are developed with different percentage contributions for each motor. This thesis also shows how measurements of a composite load respond to normal power system variations and this information can be used to continuously decompose the load continuously and to characterize regarding the load into different sizes and amounts of motor loads.
27
Abu-Adma, Maged Ahmed. "Isolated induction generator, induction motor scheme for borehole pump and other application." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47325.
Testo completo
28
Turl, Gary. "A synchronised multi-motor control system using hybrid sensorless induction motor drives." Thesis, University of Nottingham, 2002. http://eprints.nottingham.ac.uk/29510/.
Testo completoAbstract (sommario):
The main aim of this project was to research, develop and test an induction motor drive not requiring a speed encoder, but which could be considered commercially viable by motor drives manufacturers, and which should aim to meet the follow requirements: • Dynamic torque performance and steady state speed-holding accuracy to be comparable with encodered vector controlled drives • Extensive and highly accurate knowledge of electrical and mechanical parameters of the motor and load not to be required • Extensive commissioning from an expert engineer not to be necessary • Algorithm not to rely on excessive computational capability being available The drive was to operate, in a stable manner, over speed and load ranges at least comparable with commercially available sensorless induction motor drives. The above requirements were set such that the developed sensorless technique may be considered for synchronised multi-motor process applications, where the advantages of a sensorless system could be exploited for hazardous, damp and hot conditions. The solution developed consists of a leading model-based sensorless method augmented with a speed estimator that tracks harmonics, seen in the stator terminal quantities, due to rotor slotting. The model-based scheme facilitates field-orientated control for dynamic performance. The slot harmonic speed estimator tunes the model for speed accuracy. Slot harmonics are identified using a recursive signal processing method termed the Recursive Maximum Likelihood - Adaptive Tracking Filter. This work is the first example of the method being developed into a practical sensorless drive system and the complete speed identifier is described, including set-up, pre-filtering and the minimal parameter considerations. Being recursive the method is computationally efficient, yet has accuracy comparable with that of FFT identifiers used in other work. The developed sensorless strategy was implemented practically on two motor drive systems. The performance of the scheme is shown to give encoder like speed holding accuracy and field-orientated dynamic performance. The two drives were also configured and tested as a speed synchronised pair, using applicable multi-motor control techniques, themselves compared and contrasted. The sensorless performance is demonstrated, alongside an encodered version acting as a benchmark, and the performance of the two schemes is shown to be highly comparable. The author has found no other example of sensorless techniques considered for use in multi-motor applications. The use of such a technique brings established advantages associated with encoder removal and allows multi-axis electronic synchronisation to be considered for parts of a process where an encoder may not be appropriate.
29
Škoda, Josef. "Pětifázový asynchronní motor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413145.
Testo completoAbstract (sommario):
This thesis deals with the design of a five-phase machine. In the first part of this thesis are presented theoretical knowledge about five-phase machines. In the next part of the thesis is designed five-phase machine by analytical calculation according to selected parameters. This calculation includes the resulting load and start characteristics. The geometrical parameters of the machine are transferred to the Ansys program, where the finite element calculation is performed together with the required simulations. The results are compared and commented.
30
Acar, Akin. "Implementation Of A Vector Controlled Induction Motor Drive." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.
Testo completoAbstract (sommario):
High dynamic performance, which is obtained from dc motors, became achievable from induction motors with the recent advances in power semiconductors, digital signal processors and development in control techniques. By using field oriented control, torque and flux of the induction motors can be controlled independently as in dc motors. The control performance of field oriented induction motor drive greatly depends on the correct stator flux estimation. In this thesis voltage model is used for the flux estimation. Stator winding resistance is used in the voltage model. Also leakage inductance, mutual inductance and referred rotor resistance values are used in vector control calculations.
Motor control algorithms use motor models, which depend on motor parameters, so motor parameters should be measured accurately. Induction motor parameters may be measured by conventional no load and locked rotor test. However, an intelligent induction motor drive should be capable of identifying motor parameters itself.
In this study parameter estimation algorithms are implemented and motor parameters are calculated. Then these parameters are used and rotor flux oriented vector control is implemented. Test results are presented.
31
Sünter, Sedat. "A vector controlled matrix converter induction motor drive." Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/12965/.
Testo completoAbstract (sommario):
This thesis concerns the design and construction of a closed-loop controlled matrix converter induction motor drive, using transputer parallel processors. The modulation algorithms used for the matrix converter are described. A 2.5 kW experimental matrix converter using IGBT switching devices has been constructed and tested. An analysis of the losses in the converter has been carried out and this gives good agreement with the measured losses. Two modulation algorithms, the Venturini algorithm and the scalar algorithm have been implemented in real-time on a network of parallel transputer processors. Experimental results are presented to compare the operation of these two algorithms. Open-loop constant V/F control of the matrix converter induction motor drive has been demonstrated. A controller has been designed to achieve closed-loop speed control of the drive system, employing the slip regulation technique. The experimental results under various operating conditions have verified the correct operation of both control systems. The indirect vector control technique has also been implemented. The results demonstrate the steady-state and transient performance as well as the regenerative operation of the drive system. The application of a matrix converter to a high performance induction motor servo drive rated at 2.5 kW with true four quadrant capability and minimum passive components has been demonstrated.
32
Liang, Darwin Tat Wai. "Simulation and analysis of induction motor drive systems." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1427.
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33
Mirkazemi-Moud, Mehran. "Digital pulse width modulators for induction motor control." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1431.
Testo completo
34
Leith, Douglas. "Expert systems in A.C. induction motor fault diagnosis." Thesis, Robert Gordon University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280372.
Testo completo
35
Wang, Zhihuo. "Robust fault tolerant control of induction motor system." Thesis, University of Hull, 2018. http://hydra.hull.ac.uk/resources/hull:16576.
Testo completoAbstract (sommario):
Research into fault tolerant control (FTC, a set of techniques that are developed to increase plant availability and reduce the risk of safety hazards) for induction motors is motivated by practical concerns including the need for enhanced reliability, improved maintenance operations and reduced cost. Its aim is to prevent that simple faults develop into serious failure. Although, the subject of induction motor control is well known, the main topics in the literature are concerned with scalar and vector control and structural stability. However, induction machines experience various fault scenarios and to meet the above requirements FTC strategies based on existing or more advanced control methods become desirable. Some earlier studies on FTC have addressed particular problems of 3-phase sensor current/voltage FTC, torque FTC, etc. However, the development of these methods lacks a more general understanding of the overall problem of FTC for an induction motor based on a true fault classification of possible fault types. In order to develop a more general approach to FTC for induction motors, i.e. not just designing specific control approaches for individual induction motor fault scenarios, this thesis has carried out a systematic research on induction motor systems considering the various faults that can typically be present, having either “additive” fault or “multiplicative” effects on the system dynamics, according to whether the faults are sensor or actuator (additive fault) types or component or motor faults (multiplicative fault) types. To achieve the required objectives, an active approach to FTC is used, making use of fault estimation (FE, an approach that determine the magnitude of a fault signal online) and fault compensation. This approach of FTC/FE considers an integration of the electrical and mechanical dynamics, initially using adaptive and/or sliding mode observers, Linear Parameter Varying (LPV, in which nonlinear systems are locally decomposed into several linear systems scheduled by varying parameters) and then using back-stepping control combined with observer/estimation methods for handling certain forms of nonlinearity. In conclusion, the thesis proposed an integrated research of induction motor FTC/FE with the consideration of different types of faults and different types of uncertainties, and validated the approaches through simulations and experiments.
36
CASTELLANOS, JAIME ANTONIO GONZALEZ. "CONSIDERATIONS ABOUT INDUCTION MOTOR CONTROL USING ELECTRONIC INVERSORS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7431@1.
Testo completoAbstract (sommario):
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Os motores de indução são as máquinas mais utilizadas
nos
acionamentos industriais elétricas devido a sua
simplicidade, robustez, maior relação torque/corrente,
baixa manutenção, etc. Sua aceitação e aplicação em
acionamentos com velocidade variável têm sido possível
com
o desenvolvimento da eletrônica de potência. Atualmente,
muitos acionamentos utilizam diversas técnicas para
lograr
o controle de velocidade por variação da freqüência da
rede de alimentação, sendo que o controle vetorial é o
mais comum. O presente trabalho, centra-se no estudo do
desenvolvimento do motor de indução sob a aplicação do
controle de velocidade, através da análise dos
parâmetros
necessários para realizar o dito controle na faixa de
baixa velocidade, sem sensor de velocidade e/ou de
posição. O trabalho inicia-se com o estudo das
principais
características funcionamento do motor de indução. Em
seguida, a partir do modelo matemático do motor de
indução, são analisados os diferentes tipos de controle
de
velocidade, com especial ênfase na variação da
velocidade
através da variação da freqüência. Finalmente, são
estudados os parâmetros e métodos para o controle de
velocidade sem sensor. O estudo é validado com diversas
simulações realizadas no programa MatLab.<br>The induction motors are the most commonly used eletric
motors in the electrical industrial systems due its
simplicity, robustness, greater torque/current ratio, low
maintenance, etc. its acceptance and applications in
operations with variable speed has been possible with the
power electronics development. Currently, most of
operations use several techniques to achieve the speed
control by variable frequency of the power supply with
vectorial control being the most common.
The present work is centered in the study and
development of the induction drive in speed control
application, with the analysis of the necessary parameters
to control in low speed band, without speed and/or
position sensor.
The work starts with the study of main functioning
characteristic of the motor. After that, from the
mathematical model of the induction motor, different speed
control techniques are analyzed, with special emphasis in
speed variation with variable frequency. Finally, the
parameters and methods for sensor less control are
studied. The study is variation with several simulations
made Matlab program.
37
Salmon, John C. "A variable speed unipolar induction motor inverter drive." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46449.
Testo completo
38
Shaw, Steven Robert 1973. "Numerical methods for identification of induction motor parameters." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43720.
Testo completoAbstract (sommario):
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Earlier issued with only one degree specified: M.Eng. M. Eng. degree awarded in 1997; Elec. E. degree awarded in 2000.<br>Includes bibliographical references (leaves 221-223).<br>by Steven Robert Shaw.<br>Elec.E.<br>M.Eng.
39
Wei, Ching-Woei, and 魏經緯. "Estimation Parameter of Induction Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/03747997545636722409.
Testo completoAbstract (sommario):
碩士<br>淡江大學<br>電機工程研究所<br>88<br>The mathematical model of induction motors is a highly degree of nonlinear and coupled system. The control of AC motors is considerably more complicated than it DC motors counterpart.
This paper study the measurement parameter and tuning Controller of induction motor. In indirect flux oriented schema, Whether all parameter accurate directly influence whole system of Stability or not. The tradition measurement and least square Method are to used to simulate and analyze induction motor of parameter. Moreover, an optimal technique is used to the PI controller simulated results by Matlab/Simulink are included an experimented drive system with the indirect rotor flux oriented controller implemented by pc based.
40
Hsueh, Chang-Lung, and 薛昌龍. "Fuzzy Modeling for Induction Motor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/11923662149901598742.
Testo completoAbstract (sommario):
碩士<br>國立臺灣海洋大學<br>電機工程學系<br>92<br>The main purpose of this thesis is to study the fuzzy modeling for the three-phase induction motor. Two Sugeno type fuzzy induction motor are obtained from input-output data sets which are generated from both the differential equation model and the real three-phase induction motor by employing the adaptive network-based fuzzy inference system. In order to test and verify the fuzzy model can be expressed the real induction motor. We control the speed and position of the real induction motor, the classic differential equation model, and fuzzy induction motor model using constant V/f controller, fuzzy logic controller, and self-tuning mechanism. In the end, we compare with output response of the three models. Through an experimental motor speed and location control system for the three-phase fuzzy induction motor model, the constructed fuzzy induction motor model is to test and verify the feasibility of replacing the real induction motor.
Keywords: fuzzy induction motor model, Adaptive-Network-based Fuzzy Inference System(ANFIS), constant V/f controller, fuzzy logic controller, parameters self-tuning mechanism.
41
LI, XIANG, and 李象. "Inverter-induction motor performance analysis." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/60583838454078409230.
Testo completo
42
Lee, Ching-Lin, and 李青霖. "Saturated Reluctance Identification of high voltage Induction Motor and Estimation of Induction Motor/Generator Effect." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/77840688616175114971.
Testo completoAbstract (sommario):
碩士<br>國立中山大學<br>電機工程學系研究所<br>91<br>Saturated reluctance identification of induction motor can be implemented by additional sensor, finite-element method, spectrum analysis, or step voltage test in the research accounts. But it is not easy to implement in the field evaluation when we need to build up the power system model, because of the factory parameter absent, expansive cost, extra sensor installation, or variable voltage and frequency.
To be concerned with practicality, it is always inconvenient to build up simulation for the end user. The linear model of motor can’t provide the simulation answer accurately when models run into saturated during power system transient. Accordingly, this thesis discuss two paragraphs as following:
First, This thesis introduces a simple and practical method base on the manufacturer instruction manual to estimate the saturated reluctance of high / medium voltage induction motor in modeling. And we can analyze the motor dynamic characteristic by using the induction motor d-q-0 model directly, in place of traditional mathematical power equations.
Moreover, we can evaluate the motor-generation reaction because of the rotor inertia due to loss of voltage. To identify the discrepancy between numeral situations what the line capacitor existed or not. Besides, we can explain the existing voltage after power system break down by comparing the simulation result with recorder chart.
43
Lie, Shin-Chuen, and 賴信全. "Sensorless Speed Estimation of Induction Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/69202074986442783826.
Testo completoAbstract (sommario):
碩士<br>國立交通大學<br>電機與控制工程學系<br>86<br>The conventional speed transdusers in induction motor drives
impose restrictions on the mechanical ruggedness, the
maintenance and the use in poor enviroment. Therefor, a large
number of schemes for speed sensorless ac drives has been
proposed. In this thesis, the stator flux space vector is
estimated in terms of mathematic induction motor model using
measured currents and voltages to and calculate the rotor speed.
This rotor speed signal is simulated to be a reference signal.
Another rotor speed estimation is based on rotor slots harmonics
detection. Experiment results are presented to demonstrate the
characteristics and restrictions of the two different speed
estimation methods.
44
ZHANG, DING-YU, and 張錠玉. "A torque-controlled induction motor driver." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/11671733769688876962.
Testo completo
45
Li, Wei-Ting, and 李威霆. "Adaptive controller design of induction motor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/80999487544372184730.
Testo completoAbstract (sommario):
碩士<br>國立臺灣科技大學<br>機械工程系<br>89<br>The purpose of this paper is to propose an adaptive controller for induction motor control system. Some of the system parameters are assumed to be unknown time varying without any information of their variation bounds. Traditional adaptive control algorithms are not application to this kind of systems due to their time-varying nature. Here, a function approximation based controller is designed to transform the time-varying parameters into a linear combination of known orthonormal basis. Besides, the singularity problem of the decoupling matrix is dealt with by redesigning the parameter update algorithms. Simulation cases shown that the proposed schemes have excellent performance.
46
Wang, Chi-Nam, and 王旗男. "Multilevel PWM Inverter Control Induction Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/28752679261546760678.
Testo completoAbstract (sommario):
碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>89<br>This paper presents a five-level diode clamp inverter control for induction motor by using simple V/F control law. Multilevel voltage source inverter is based on the extension of two-level inverter. By using the multilevel pulse width modulation scheme, we can obtain better output voltage and current waveform with less harmonics. The advantage of multilevel inverter is using low rated power MOSFET to implement high voltage or high power applications. To implement the adopted multilevel scheme for induction motor , the computer simulations and hardware tests based on digital signal processor (TMS320C50) are presented in this thesis.
47
Chou, Chia-Chun, and 周家駿. "Best of the Induction Motor Efficiency." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/5phnbk.
Testo completoAbstract (sommario):
碩士<br>國立中正大學<br>機械工程學系暨研究所<br>103<br>This thesis is mainly to use DSP as the implementation platform and build up the vector control algorithm for induction motors. First, we introduce and analyze the induction motor model and vector control methodology, and then derive the best efficiency and the highest acceleration formulation for induction motors. The derived theoretical model has been validated by the Matlab Simulink progrm. In the experiment, we use the TMS320 F28335 digital signal processing by Texas Instruments company to carry out the vector control. Through signal control card measurement, the best efficiency and highest acceleration can be verified experimentally. Finally, the influences of the motor parameters changes on the efficiency and the acceleration are discussed.
48
Pey, Chen Horng, and 陳洪霈. "Simulation and Control of Induction Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/33283880919958543605.
Testo completoAbstract (sommario):
碩士<br>國立臺灣科技大學<br>機械工程系<br>88<br>This thesis provides a method, using MATLAB Simulink software, to develop modules of induction motors and do the simulation under the Indirect Rotor Field Oriented Vector Control theorem. After the simulation, RTW(real time workshop) is used for real-time control to rotary induction motor and linear induction motor.
MATLAB Simulink contains the advantages of rapidly designing, easily correcting and friendly human-machine interface. Real time control is implemented under the RTW in MATLAB Simulink. RTW translates the simulation modules to executable C code. Users can only change the modules of the mathematical induction motor models into the I/O modules and do the experiments on Windows 98SE operation system. By using the digital interface card, data are delivered to the inverter and feedback the signals from Hall-Sensor and position encoder.
The thesis begins with constructing the mathematical induction motor models and blocks of RFO Vector Control in MATLAB Simulink. The Clarke and the Park transformation are also used for the Vector Control theorem. After the simulation, this thesis continues presents the Vector Control experiments by RTW. Besides, Vector Control of linear induction motor is discussed. The primary current is divided into the force current and the exciting current. Control the two direct components separately, the Vector Control of linear induction motor is accomplished.
49
Lee, Che-Ming, and 李哲銘. "Speed Sensorless Control of Induction Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/64791497222125832985.
Testo completoAbstract (sommario):
博士<br>國立臺灣大學<br>電機工程學系<br>86<br>This dissertation presensts a new sensorless speed estimation
method for induction motor, which replaces the feedback signal of
conventional speed sensors. Using the proposed method, closed-loop
speed control is accomplished without any speed measurement.
The proposed method is based on an adaptive flux observer, in
which a second-order Kalman filter is employed to modify the
esitmated rotor flux using the actually measured stator currents. The
modified rotor flux estimate is substituted into the speed estimation
equation derived in the adaptive observer to improve the speed
estimation results. In comparison with the reduced-order Kalman
filter method, the proposed method reduces the computation
complexity. Moreover, the proposed method improves the accuracy
of speed estimation compared with the conventional adaptive
observer, while maintaining the computational load moderate.
In the experimental implementation, vector control and direct
torque control are investigated to verify the effectiveness of the
proposed speed and flux observer. With the proposed method, speed
sensorless control of induction motor is achieved. Experimental
results shwo that the proposed speed estimation scheme improves the
accuracy of speed estimation compared with the conventional
adaptive observer. The proposed method is proven to be an effective
speed sensorless control strategy of induction motor with moderate
computational load.
50
Hung-Yen, Fang, and 方弘延. "Sensorless Speed Controller of Induction Motor." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/09568418114384667594.
Testo completoAbstract (sommario):
碩士<br>國立屏東科技大學<br>車輛工程系碩士班<br>93<br>Induction motors are used very often in industries. In general, speed sensors are necessary to have induction motors controlled. However, because of the less reliability or lack of space, sometimes, speed sensors are not applicable to certain induction motors. To avoid this, this research proposes a sensorless speed control algorithm for induction motors. The control algorithm proposed is basically an adaptive sliding-mode-like control algorithm which estimates the motor speed with the measurement values of current and voltages. The real motor speed is then controlled to track the estimation. The Lyapunov stability criterion is used to ensure the convergence of the estimation errors as well as the stability of the adaptive control algorithm. Simulations and experiments have been done to validate the developed adaptive sensorless speed control algorithm.