Dissertations / Theses: 'Three phase induction machine'

1

Gao, Liliang. "Control of three-level 5-phase induction machine drive system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510860.

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Cheang, Tak Son. "Inter-turn faults of three-phase induction machines." Thesis, University of Macau, 1997. http://umaclib3.umac.mo/record=b1445597.

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Andrews, Darin M. "Direct torque control of a three-phase voltage source inverter-fed induction machine." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/38872.

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Approved for public release; distribution is unlimited.
The scope of this thesis involves various techniques to control the torque of a voltage source inverter-fed induction motor. The three methods investigated here are voltage by frequency, known as scalar control, field-oriented control with and without space vector modulation, and direct torque control. Although all three techniques have been proven effective, each technique possesses its own advantages and disadvantages. In todays engineering world, time and money are saved by utilizing software developed to accurately model a physical system and to compare with hardware previously implemented in a lab. Comparisons can be made to determine how each of these torque control methods perform under static and dynamic modes of operation. The United States military can benefit from this study by modifying or adding onto the software models developed here with little cost and use these models to do trade studies without the cost of lab demonstrations.

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Mustafa, Mohammed Obaid. "Faults detection and diagnosis for three phase induction machines." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26592.

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Three phase induction motors have been intensively utilized in industrial applications, mainly due to their efficiency and reliability. These motors have good properties such as: increased stability and robustness, durability, large power to weight ratio, low production costs and controllability easiness. The most common faults that could happen in the rotor and the stator are: a) short circuit in stator winding, b) broken rotor bars, c) bearing failures, and d) dynamic or static air gap irregularities. These types of faults, are necessary to be identified and categorized, as soon as possible as they can end up in serious damages if not detected in due time.The aim of this licentiate thesis is to present a model based fault detection and diagnosis schemes for three phase induction motors relying on the Set Membership Identification (SMI) approach. In the proposed scheme proper uncertainty bounds and boundary violation rules have been established for detecting and categorizing the fault occurrences. The novel presented diagnostic and fault detection methods are able to detect and classify two types of induction motor faults: a) broken rotor bars, and b) short circuit in stator winding. As it will be analytically presented in the thesis, during the initialization of the algorithm, the parameters of the healthy induction motor are being identified by the utilization of the Recursive Least Squares, extended by the Set Membership concepts, where corresponding uncertainty bounds are also being recursively being calculated based on the assumed noise levels. In the sequel the proposed bound violation conditions for the fault detection and fault diagnosis are being online evaluated, on the converged identified motor parameters, within a sliding time window.The simulation results have been presented motor performance in healthy and faulty cases such as stator currents, rotor currents, torque, and angular speed of the motor. The efficiency of the proposed scheme has been extended evaluated with simulation studies for the cases of: a) one broken bar fault, b) 2\% short circuit fault, c) multiple number of broken bars.
Godkänd; 2012; 20121104 (mohoba); LICENTIATSEMINARIUM Ämne: Reglerteknik/Automatic Control Examinator: Professor Thomas Gustafsson, Institutionen för system- och rymdteknik, Luleå tekniska universitet Diskutant: Post-Dr. Researcher George Georgoulas, Dept. of Informatics and Communications Technology, TEI of Epirus, Greece Tid: Tisdag den 4 december 2012 kl 10.15 Plats: A109, Luleå tekniska universitet
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McKinnon, Douglas John Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Novel efficiency evaluation methods and analysis for three-phase induction machines." Awarded by:University of New South Wales. Electrical Engineering and Telecommunications, 2005. http://handle.unsw.edu.au/1959.4/21869.

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This thesis describes new methods of evaluating the efficiency of three-phase induction machines using synthetic loading. Synthetic loading causes the induction machine to draw full-load current without the need to connect a mechanical load to the machine's drive shaft. The synthetic loading methods cause the machine to periodically accelerate and decelerate, producing an alternating motor-generator action. This action causes the machine, on average over each synthetic loading cycle, to operate at rated rms current, rated rms voltage and full-load speed, thereby producing rated copper losses, iron loss and friction and windage loss. The excitation voltages are supplied from a PWM inverter with a large capacity DC bus capable of supplying rated rms voltage. The synthetic loading methods of efficiency evaluation are verified in terms of the individual losses in the machine by using a new dynamic model that accounts for iron loss and all parameter variations. The losses are compared with the steady-state loss distribution determined using very accurate induction machine parameters. The parameters were identified using a run-up-to-speed test at rated voltage and the locked rotor and synchronous speed tests conducted with a variable voltage supply. The latter tests were used to synthesise the variations in stator leakage reactance, magnetising reactance and the equivalent iron loss resistance over the induction machine's speed range. The run-up-to-speed test was used to determine the rotor resistance and leakage reactance variations over the same speed range. The test method results showed for the first time that the rotor leakage reactance varied in the same manner as the stator leakage and magnetising reactances with respect to current. When all parameter variations are taken into account there is good agreement between theoretical and measured results for the synthetic loading methods. The synthetic loading methods are applied to three-phase induction machines with both single- and double-cage rotors to assess the effect of rotor parameter variations in the method. Various excitation waveforms for each method were used and the measured and modelled efficiencies compared to conventional efficiency test results. The results verify that it is possible to accurately evaluate the efficiency of three-phase induction machines using synthetic loading.

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Izguden, Mustafa. "Design Software Development For Induction Motors." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613229/index.pdf.

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The purpose of this thesis has been to convert two softwares called TPCAD (Three Phase Induction Machine Computer Aided Desing) and SPCAD (Single Phase Induction Machine Computer Aided Design) developed earlier for the design and analysis of three and single phase induction machines to meet the needs of motor manufacturing industry so that they can be run in windows environment. Furthermore, it was aimed to include features such as double cage motor analysis and design, to provide a facility designed motor lamination can be drawn for the user to see and facilitate sharing the designed lamination with other professional programs such as finite element analysis or thermal analysis etc. As a result of this study, a user friendly design tool facilitating the design process of induction motors has been upgraded by using C++ Microsoft Visual Studio .Net programming language. TPCAD and SPCAD are tested with different commercial motors. The results show that the full load performance calculations are within the range of 5% error for both programs. However, starting performance calculation errors are within 10% for TPCAD, and 8% for SPCAD.

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Schoen, Randy R. "On-line current-based condition monitoring of three-phase induction machines." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/12952.

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8

Paterson, Neil. "The analysis and detection of faults in three phase induction machines using finite element techniques." Thesis, Robert Gordon University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244269.

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9

Juchelka, Roman. "Návrh asynchronního motoru pro kaskádní systém čerpání kapalin." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241987.

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This thesis deals with the design of electrical machine for direct drive of cascade liquid pumping system. At the beginning a suitable type of electrical machine and some of its basic parameters are selected. Finally, the 4 pole three phase induction machine powered by alternating voltage 3x400 V was chosen. After that complete design is made with respect to all specified requirements. The designed machine is analyzed with the use of ANSYS Maxwell and RMxprt software. The main outcome of the thesis are dimensional sketches of the engine that will be used as the basis for the production of the prototype.

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Singh, Bhanu Pratap. "Real-time detection of stator resistance unbalances in three phase drives." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286813.

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An estimated 30% of the faults in Induction Machine (IM) are related to its stator. These faults are mostly in the form of an Inter-Turn Short Circuit (ITSC) fault i.e., when two winding inside the stator of IM are shorted due to insulation failure. However, ITSC fault can be avoided by detecting them in advance and then scheduling the maintenance of the IM. This thesis studies two methods for detecting this incipient ITSC fault in a three-phase IM and then estimating the stator resistance unbalance due to the ITSC fault. The first method is based on the asymmetry caused in the IM by the ITSC fault. As a result of this asymmetry, the negative sequence components of the stator voltages and the stator currents are generated inside the IM. A healthy IM also have these negative sequence components due to the manufacturing process and the supply voltage unbalances. The characteristics and the compensation methods of these negative sequence components in a healthy IM are discussed. The results show that after compensating the negative sequence components in a healthy machine, they can be used for detecting an ITSC fault and then to calculate the fault quantities as well as the stator resistance unbalances. The second method for detecting an ITSC fault is based on analysing the stator resistance unbalances. A three-phase drive is used to inject DC voltage in the stationary reference frame. The DC current generated by this DC voltage is measured and then by applying Ohm’s law stator phase resistances are calculated. In a healthy IM, the phase resistances are balanced. However, in case of ITSC fault in any of the phases, the phase resistance of that phase deviates from those of the other two phases which can be utilized for detecting ITSC fault.
Uppskattningsvis 30% av alla fel i induktionsmaskiner (IM) är kopplad till dess stator. Dessa fel är i huvudsak Inter-Turn Short Circuit (ITSC)-fel, dvs. två lindningar inom IM:ens stator blir kortsluta pga. ett isoleringsfel. Emellertid kan man undvika ITSC-fel genom att detektera dem i förhand och planera underhåll. Det här examensarbetet undersöker två metoder för att detektera ett förestående ITSC-fel i en tre-fas IM. Den första metoden är baserad på asymmetrin i IM:er pga. ITSC-felet. Resultatet av den här asymmetrin är att en negativ sekvens genereras i IM:ens statorspänning och statorström. En oskadad IM kan också visa dessa negativa sekvenser pga. tillverksprocessen och statorspänningsobalanser. Egenskaperna och kompensationsmetoderna för dessa negativa sekvenser i en oskadad IM kommer att diskuteras. Resultaten visar att efter kompenseringen av de negativa sekvenserna i en oskadad IM, kan de användas för att detektera ITSC-fel och efteråt för att beräkna felstorheter och även statormotståndobalanser. Den andra metoden för att detektera ITSC-fel är baserad på en undersökning av statormotståndobalanser. Ett tre-fas-drivsystem används för att injektera likspänning i den stationära referensramen. Likströmmen som följer av denna likspänning mäts och statorfasmotstånden beräkna efteråt med Ohms lag. I en oskadad IM är fasmotstånden balanserade. Däremot, när ett ITSC-fel uppstår i en fas, avviker fasmotståndet i den felaktiga fasen från de andra två fasernas, vilket kan användas för att detektera ITSC-fel.

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Goynuk, Yilmaz. "Development Of An Electrical Machines Analysis And Optimum Design Software Package." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609788/index.pdf.

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In this study, three different programs are developed for the analysis of the three-phase induction motor, single-phase capacitor type induction motor and switched reluctance motor. The programs are developed by using Pascal and C++ programming languages. In the performance calculations of motors, analytical methods are used and these methods are tested for accuracy. These programs have also capabilities to design an optimum motor, which meets a set of performance, material and manufacturing constraints while minimizing the weight or any other defined objective function. In addition, in this study, an optimization tool is used to obtain an appropriate optimization method for the design of different types of motors. The software is tested over different commercial motors. The results illustrates that the performance calculations and optimization approach of the programs lead to good results.

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Cheang, Tak Son. "Math-model based machinery and AI-based diagnostic technologies for detecting and locating the inner-faults of three-phase squirrel-cage induction motors." Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2148534.

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13

Wong, D. "Speed control of three-phase induction motors." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376194.

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Svoreň, Jan. "Návrh vysokootáčkového asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219753.

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This work deal with troubleshooting of problem parts of high-speed induction machines. Introduction is about conception of induction machines with reference to construction specialities due to high rpm and because machines are fed by inverter. Next part is focused to design problems. A classical induction machine was measured to determination change of various losses in classic and high-speed induction machines. The computation of laboratory sample high-speed motor was specified for calculation of effective resistance and leakage reactance of solid-steel rotor with copper layer. The results of numerical calculation were validated by using finite elements method and machine design was adjusted for improving operation characteristic.

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Govindsamy, Matthew. "Sensorless speed estimation in three phase induction motors." Thesis, Port Elizabeth Technikon, 2002. http://hdl.handle.net/10948/139.

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This thesis proposes a technique to determine and improve the performance of a sensorless speed estimator for an induction motor based on Motor Current Signature Analysis (MCSA). The theoretical concepts underlying the parameter based observer are developed first and then the model of the observer is built using Simulink. The observer is developed based on Model Reference Adaptive System (MRAS). The dynamic performance of the observer and its behavior due to variation of machine parameters is studied. The error in speed estimated using this observer is shown and the ability of MCSA to retune the rotor speed from the stator current spectrum. The spectrum estimation technique has been implemented using a software routine in Matlab. Both the observer and MCSA techniques were implemented practically on an induction motor. The performance of the combined sensorless speed estimation system was tested and verified.

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Mouzinho, Lucilene Ferreira. "REDES NEURAIS ARTIFICIAIS PARA ESTIMAÇÃO DE VELOCIDADE EM MÁQUINAS DE INDUÇÃO." Universidade Federal do Maranhão, 2003. http://tedebc.ufma.br:8080/jspui/handle/tede/322.

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Made available in DSpace on 2016-08-17T14:52:46Z (GMT). No. of bitstreams: 1 Lucilene Ferreira Mouzinho.pdf: 571993 bytes, checksum: 2e8dd4d10b95625fa753d51326490aa5 (MD5) Previous issue date: 2003-03-12
This work presents an artificial neural network model to estimate or indirectly measure the speed of three-phase induction machines for control purpose. A comparative analysis of the neural estimator is performed with the following types of speed estimators: rotor flux, electromotive force and model reference adaptive. The algorithms of the estimators are assembled and connected to the dq0 model of the induction machine. Computational simulation results, obtained from machine-estimators model, are used to carry out a comparative analysis of the speed estimators performance. This work also presents a survey on neural network applications in induction machines, covering the following issues: control, failure, supervision, diagnosis, identification and estimation.
Nesta dissertação apresenta-se um modelo de uma rede neural artificial para estimar ou medir indiretamente a velocidade em máquinas de indução trifásicas para fins de controle. Realiza-se uma análise comparativa do estimador neural com os seguintes tipos de estimadores de velocidade fundamentados: fluxo do rotor, força eletromotriz e modelo adaptativo de referência. Os algoritmos dos estimadores são construídos e acoplados ao modelo dq0 da máquina de indução. A partir de resultados de simulações computacionais, obtidos dos modelos máquina-estimadores, realiza-se a análise de desempenho dos estimadores que tem como objetivo verificar quais dos estimadores atingiu em menor tempo uma velocidade de referência. Este trabalho também apresenta um estudo sobre a aplicação de redes neurais em máquinas de indução, abordando os seguintes tópicos: controle, falhas, supervisão, diagnóstico, identificação e estimação.

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Kneebone, Nigel J. "Efficiency and speed control of three-phase induction motors." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277167.

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Ai, Yong-le. "Novel direct field and torque control of six-phase induction machine with special phase current waveform." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/489.

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Zoric, I. "Multiple three-phase induction generators for wind energy conversion systems." Thesis, Liverpool John Moores University, 2018. http://researchonline.ljmu.ac.uk/8387/.

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During the past decade, there has been a considerable increase in the number of published works on multiphase machines and drives. This increased interest has been largely driven by a need for the so-called green energy, i.e. energy generated from renewable sources such as wind, and also an increased emphasis on greener means for transportation. Some of the advantages multiphase machines offer over three-phase counterparts are better fault tolerance, smaller current and power per phase, and higher frequency torque ripple. This thesis examines use of a multiphase induction generator in wind energy conversion systems (WECS). In particular, multiphase generators that comprise multiple 3-phase winding sets, where each winding set is supplied using an independent 3-phase voltage source inverter (VSI), are studied. It is claimed that these topologies offer advantages in cases where a WECS is connected to a multitude of independent ac or dc microgrids, systems where a single high-voltage dc link is needed or where a simple fault tolerance is achieved when a complete winding set is switched off. All of these examples require an arbitrary power or current sharing between winding sets. In order to achieve arbitrary current and power sharing, the control can be implemented using multi stator (MS) variables, so that the flux and torque producing currents of each winding set can be arbitrarily set. As an alternative, this thesis uses vector space decomposition (VSD) to implement the control, while individual winding set flux/torque producing currents are governed by finding the relationships between MS and VSD variables. This approach has all the advantages of both MS and VSD, i.e. access to individual winding set variables of MS and the ability to implement control in the multiple decoupled two dimensional subspaces of VSD, while heavy cross coupling between winding set variables, a weakness of MS, is avoided. Since the goal of the thesis is to present use of multiphase machines in WECS, modelling and simulation of a simple multiphase WECS in back-to-back configuration has been performed at first. All systems relevant to machine control where considered, such as grid and machine side VSIs, grid filter, indirect rotor field oriented control, current control in both flux/torque producing and non-producing subspaces, low order harmonic elimination, maximum power point tracking control, and voltage oriented control of the grid side VSI. Moreover, various WECS supply topologies were considered where developed current and power sharing would be a necessary requirement. Development of the proposed current sharing control commences with an analysis of multiple 3-phase machine modelling in terms of both MS and VSD variables. Since the actual control is implemented using decoupled VSD variables, VSD modelling has been studied in detail, resulting in an algorithm for creation of the VSD matrix applicable to any symmetrical or asymmetrical multiphase machine with single or multiple neutral points. Developed algorithm always decouples the machine into orthogonal two-dimensional subspaces and zero sequence components while making sure that all odd-order harmonics are uniquely mapped. Harmonic mapping analysis is offered as well. Next, relationship between MS and VSD variables has been developed by mapping MS variables into VSD subspaces. Since VSD matrix creation algorithm is valid for any multiphase machine, relationship between MS and VSD variables is applicable to any multiple 3-phase machine regardless of the configuration (symmetrical/asymmetrical), number of neutral points or machine type (synchronous or induction). Established relationship between MS and VSD has been used to implement current sharing control in decoupled VSD subspaces of the machine. It is shown that in order to achieve arbitrary current sharing it is only necessary to impose currents in flux/torque non-producing subspaces. Hence, total machine’s flux and torque are not affected at all. Besides verification by Matlab simulations, two topologies are experimentally investigated, a parallel machine side converter configuration and the case when a single high voltage dc link is created by cascading dc-links of the machine side VSIs. In the first case the ability of arbitrary current sharing between winding sets is validated, while the second tested topology demonstrates use of the developed control for the purpose of voltage balancing of the cascaded dc links.

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Malliband, Paul Derek. "Wide speed range three-phase induction motors for domestic appliances." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614174.

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Liang, Bo. "Condition monitoring and fault diagnosis of three-phase induction motors." Thesis, University of Manchester, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488140.

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It is well known there are three main approaches to maintenance of machinery, namely breakdown maintenance, scheduled maintenance and preventive maintenance. Breakdown maintenance is practised when machines are operated until they fail before maintenance is carried out. This out-of-date maintenance policy is slowly being abandoned by industry. Scheduled maintenance relates to interrupting machinery at regular intervals for the purposes of maintenance and this policy is still being used in many areas even though it is expensive one. The third maintenance policy is that of preventive maintenance. This approach aims to perform machinery maintenance just before a fault occurs and therefore is used to optimise the maintenance function. The basis of this approach is fault detection, severity assessment and fault diagnosis collectively referred to as condition monitoring. The objective of machinery condition monitoring is to obtain the earliest possible warning of incipient damage or malfunction and to assist in the diagnosis of the subsequent cause. There are many books that focus on condition monitoring and fault diagnosis [1-3]. According to Matthew [4], machine condition monitoring is concerned with obtaining data that would aid in evaluating machinery mechanical and electrical integrity. It is the measurement of various parameters related to the mechanical and electrical condition of the machinery such as vibration, acoustic emission, temperature, oil pressure, oil debris, voltage, current, conductivity and corrosion which make it possible to determine whether the machine is healthy. In addition machinery models can be established for simulating and predicting the trend of changing parameters. These are parameters such as vibration, temperature, pressure, current and voltage that change as a result of differing operating condition, thus providing the maintenance engineer with prior knowledge that may be used for maintenance or improving the performance of the machine. It is generally accepted that condition monitoring offers many advantages.

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Rajamani, Haile-Selassie. "High speed, three-phase induction motor drives for domestic appliances." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627054.

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Chaudhari, Subodh. "Load based energy savings in three phase squirrel cage induction motors." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3749.

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Thesis (M.S.)--West Virginia University, 2004.
Title from document title page. Document formatted into pages; contains x, 147 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 117-121).

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Dinu, Andrei. "FPGA neural controller for three-phase sensorless induction motor drive systems." Thesis, De Montfort University, 2000. http://hdl.handle.net/2086/4132.

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Alolah, A. I. "Microprocessor controlled three-phase inverter for variable-speed induction motor drive." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371466.

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Bawana, Niyem Mawenbe. "Thermal Response in a Field Oriented Controlled Three-phase Induction Motor." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7740.

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The research conducted at the department of Electrical Engineering of the University of South Florida campus in Tampa only covers the electrical aspect of electric drives. However, the performance of electric machinery is significantly impacted by temperature variation. The literature review shows three main control techniques in use today in electric drives namely, Scalar control, Direct Torque control and Field Oriented control. This thesis presents a temperature rise of rotor bars, stator winding, stator core and stator frame in a running three phase field-oriented controlled induction machine. A literature search shows that none of research has been carried out to investigate a thermal response of a field-oriented controlled induction motor. With this motivation, we were able to implement a lumped parameters thermal model of a three-phase field-oriented IM in MATLAB Simulink, which allows us to determine that rotor bars have the highest temperatures rising to 84 degrees Celsius. This confirms that rotors bars are the hottest part of a running IM as stipulated in literature.

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Patel, Sagarkumar. "Speed Control of Three-Phase Induction Motor Using Variable Frequency Drive." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10690223.

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There are various methods for speed control of induction motors. This paper specifically describes one of the methods: speed control using variable frequency. The proposed system is a MATLAB simulink model, which is a closed loop model designed to achieve desired speed control of a three-phase induction motor by varying its frequency. The simulink model has four main blocks, namely the inverter, synchronous machine, proportional integral control and current hysteresis control. For accuracy of output results and simplicity, we have used dq to abc transformation block and sin function block. The inverter is comprised of six integrated gate bipolar transistors (IGBTs), which are fired by gate pulses generated by current hysteresis control block. The inverter generates variable frequency and variable voltage output, which is given to motor terminals. The project presents the working principle of variable frequency drive (VFD), its performance, and the use of Pulse Width Modulation (PWM) in a three-phase inverter to control the frequency and thus the speed. The proposed method conformed to performance predictions and delivered the desired outputs.

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Ad'doweesh, K. E. "A microprocessor based PWM inverter drive incorporating a three-phase induction motor." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371459.

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Belaroussi, Mohamed. "Intelligent real-time microcontroller of pulsewidth modulation controlled three-phase induction motors." Thesis, Robert Gordon University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303619.

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Venkatesh, Sridhar Chakravarthy. "The development of a digital controller for a three-phase induction motor." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35005.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
Includes bibliographical references (leaves 76-77).
by Sridhar Chakravarthy Venkatesh.
M.S.

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Ashnibha, Rmdan Abdussalm. "An investigation into current and vibration signatures of three phase induction motors." Thesis, Manchester Metropolitan University, 2012. http://e-space.mmu.ac.uk/314037/.

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This research aimed at investigating the relationship between three phase induction motors vibration (MVS) and current signatures (MCS). This is essential due to the cost of vibration measuring equipment and in cases where vibration of interest point is not accessible; such as electrical submersible pumps (ESP) used in oil industry. A mathematical model was developed to understand the effects of two types of induction motors common faults; rotor bar imperfections and phase imbalance on the motor vibration and current signatures. An automated test facility was developed in which 1.1 kW three phase motor could be tested under varying shaft rotation speeds and loads for validating the developed model. Time and frequency domains statistical parameters of the measured signals were calculated for fault detection and assessing its severity. The measured signals were also processed using the short time Fourier transform (STFT), the Wigner-Ville distribution (WVD), the continuous wavelet transform (CWT) and discrete wavelet transform (DWT) and wavelet multi-resolution analysis (MRA). The non-stationary components, representing faults within induction motor measured vibration and current signals, were successfully detected using wavelet decomposition technique. An effective alternative to direct vibration measurement scheme, based on radial basis function networks, was developed to the reconstruction of motor vibration using measurements of one phase of the motor current. It was found that this method captured the features of induction motor faults with reasonable degrees of accuracy. Another method was also developed for the early detection and diagnosis of faults using an enhanced power factor method. Experimental results confirmed that the power factor can be used successfully for induction motor fault diagnosis and is also promising in assessing fault severity. The suggested two methods offer inexpensive, reliable and non-intrusive condition monitoring tools that suits real-time applications. Directions for further work were also outlined.

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Chambega, D. J. "Analysis and control of a three phase power permanent magnet machine." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382343.

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33

Almarhoon, Ali. "Sensorless control of dual three-phase permanent magnet synchronous machine drives." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15888/.

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34

Hsieh, Meng Ju, and 謝孟如. "Parameter Identification of Three-phase Induction Machines." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/41259286733237303150.

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碩士
長庚大學
電機工程學系
99
The purpose of this thesis is to develop a measurement system which is suitable for users to measure parameters and operating characteristics of induction machine on site. In this study, parameters and operating characteristics of three-phase induction machine will be determined from the free acceleration and deceleration tests with the measurement of single-phase voltage and current signals. First, the method to determine the induction machine operating characteristics in the all periods of free acceleration and deceleration tests is introduced. The IEEE standard test procedure for polyphase induction motors and generators(IEEE Std. 112) is also introduced. A 5hp induction motor is tested accuracy to the IEEE Std. 112. The parameters obtained from the test are used as a basis for comparison. Use of the NI-DAQmx data acquisition card and Labview program implements the identification system for the same 5hp induction motor. The determined parameters are then used in the Matlab/Simulink simulations to verify the effectiveness of the proposed method.

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35

Lee, Jian-Lin, and 李建霖. "Development of Bidirectional Three-phase Induction Machine Drives for Dynamometer with Energy Recovery." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/g6bjw7.

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碩士
國立臺灣科技大學
電機工程系
105
The thesis aims to develop bidirectional three-phase induction machine drives for dynamometer with the feature of energy recovery when the electric motor under test serves as a prime mover. The bidirectional power conversion consists of power converter, dc-link and power inverter. The three-phase induction machine is operated either in motor or generator mode, corresponding to the motoring or braking operation of the electric motor under test. Under motor mode, indirect rotor field-oriented control is introduced. The feedback signals of three-phase current, rotor position and speed are obtained for current vector as well as speed closed-loop controls. Whereas, for induction generator under grid-connected operation, the reversed three-phase power conversion and digital phase-lock loop are designed to calculate the phase angle of power grid to facilitate synchronous frame transformation for the dc voltage and current closed-loop controls. System simulation is given using Matlab/Simulink. A 32-bit digital signal processor, TMS320F28335, is adopted as the control core. Since control strategies are mostly implemented by software program, circuit components are reduced largely. Experimental results show that when the three-phase induction machine is operated in motor mode at 2000 rpm, the power output from the induction motor is 2 kW with the peak phase current and total harmonic distortion (THD) of 12.80 A and 4.31%, respectively, on the motor input; the corresponding values on the grid side are 7.44A and 5.14%. The overall efficiency of the motor drive reaches 76.50%. While in generator mode at 2000 rpm, the mechanical power input to the induction generator is 2 kW, the peak generator phase current and THD are 12.83A and 3.04%, respectively. The corresponding values on the grid side are 5.82A and 4.57%. The overall efficiency of the generator system is 72.69%. The experimental results verify the feasibility of the proposed system.

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36

Jia-MingSyu and 許家銘. "Diagnosis System of Bearing Fault for Three Phase Induction Motor Based on Support Vector Machine." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/uw52af.

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37

Wey, Shiuann-Jiunn, and 魏炫浚. "A study on the harmonic impedance of a three-phase induction machine under various operating situations." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29688321276352344896.

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碩士
國立雲林科技大學
電機工程系碩士班
95
This paper deals for a three-phase induction machine operating at motor-mode, grid-connection induction generator(GCIG) and self-excited induction generator(SEIG) harmonic impedance response. This paper utilizes a single-phase equivalent circuit of a three-phase induction machine to be its analytical model and then predicts variations of harmonic impedances. The EMTP/ATPDraw and MATLAB/Simulink are also utilized to simulate harmonic interferences into the three-phase induction machine at different operating situations. Finally, experimental results carried out using a 0.5hp three-phase induction machine confirm the feasibility and validity of the analytical modeling to EMTP/ATPDraw, MATLAB/Simulink simulations.

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38

Wiedenbrüg, Ernesto J. "Measurement analysis and efficiency estimation of three phase induction machines using instantaneous electrical quantities /." 1998. http://hdl.handle.net/1957/8890.

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39

Zhong-TingHuang and 黃仲廷. "Application of Support Vector Machine and Neural Network for Bearing Fault Diagnosis System of Three Phase Induction Motors." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ywr8a8.

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40

SHEU, RUEY-LONG, and 許瑞龍. "Experimental study of a two-dimension perturbation and observation algorithm for improving the unbalanced operation of a three-phase induction machine in motor and generator modes." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/qj49su.

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博士
國立雲林科技大學
工程科技研究所
104
To address the voltage unbalance issues of the single-phase powered three-phase induction motor and the three-phase self-excited induction generator supplying single-phase loads, a novel balancing scheme with PC-based control called the two-dimensional perturbation and observation method is proposed and implemented. In the first part, the balancing scheme is composed of two static Var compensators (SVCs) in Steinmetz connection, and is modeled and analyzed by the positive- and negative-sequence equivalent circuits of the three-phase induction motor. The steady-state analysis allows the proper values of the energy-storage elements that balance the motor to be found. Simulations using the EMTP have shown that the motor can be balanced from starting to full load by adjusting the SVCs' firing angles. In the second part, the induction motor is operated as a self-excited induction generator. Appropriate control of the SVC firing angles also allows the single-phase loaded generator to work in a balance condition. Finally, a practical 0.5 HP cage induction motor with SVCs is used in the motor mode and the generator mode to test the PC-based control interface. The testing results indicate that the experimental results are in very good agreement with the simulation results, which demonstrates that the proposed PC-based control interface is feasible and can have more future applications.

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41

liu, Lih-shyh, and 劉立士. "Analysis Three-phase induction motor under unbalanced Three-phase Sources." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/85707135169259301413.

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碩士
國立成功大學
電機工程學系
87
This thesis investigates the startup transients, dynamic and steady-state characteristics of a three-phase induction motor under unbalanced three-phase sources. Three stator-winding configurations, Y-connection without neutral line, Y-connection with neutral line, and △-connection, are respectively employed. The voltage unbalanced factors of the studied machine under voltage-magnitude and phase-angle variations of one phase are both studied using symmetrical components. The Electromagnetic Transients Program (EMTP) is also utilized to examine the transients, dynamic and steady-state performances of the studied motor under different values of voltage unbalanced factor.

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42

Hsu, Kuo-Feng, and 徐國峯. "Efficiency Improvement of Three-phase Induction Motors." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/czdh3e.

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碩士
國立臺灣科技大學
電機工程系
106
In response to the upgrade of global energy efficiency standards, the efficiency of low-voltage three-phase squirrel-cage induction motor is mandatorily upgraded to class IE3. Therefore, this thesis proposes to reduce the iron and rotor copper losses by using low-loss silicon steel sheet material and copper-bar rotor to replace silicon steel sheets and cast-aluminum rotor, respectively. Two 6-pole, 250HP, three-phase induction motors are designed and built, and the experimental as well as its counterpart groups are formed for benefit improvement analysis. The empirical formula and silicon iron loss curves are introduced to calculate the range of iron loss reduction. The measured results agree closely with the predicted values, and indicate that the core loss can be effectively improved. As to the reduction of rotor copper loss, copper-bar and its end ring resistance are calculated to assess the proportion that the copper loss of the rotor can be decreased. In addition, finite element method of Flux 2D is used to analyze the static magnetic field of the stator and rotor slots to ensure smooth flux line distribution with flux density lower than the saturation value. The IEEE 112-A, IEEE 112-B and CNS 5421, which are the methods for dynamometer evaluation, measurement of stray-load loss as well as the efficiency test with circle diagram, respectively, are adopted to evaluate the motor designed. The corresponding efficiencies are 95.97%, 95.90% and 96.10%. All are higher than the minimum efficiency of 95.80% required by IE3. Meanwhile, since efficiency improvement needs to take motor starting performance into consideration, real test yields the starting torque of 270.1 kg-m for the motor with copper-rotor bar, which is larger than the rated torque of 183.1 kg-m as required by NEMA standard. Besides, starting current measurement gives 2,108A for the motor with copper-bar rotor, which is smaller than 2,191A as specified by Code G. Both the starting torques and currents obtained from real test for the motors with cast-aluminum rotor as well as copper-bar rotor are further confirmed by the three calculation methods proposed by CNS 5421. In short, the efficiency of the proposed low-voltage three-phase squirrel-cage induction motor is upgraded to class IE3 with its starting torque and starting current comply with international standard.

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43

Chen, HuiLiang, and 陳輝良. "Control of Three Phase AC Induction Motors." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/61361859156480295489.

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44

LI, GING-MAO, and 李慶茂. "A soft-starter for three-phase induction motors." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/12021997112026497314.

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45

Cheng-Hsi, Wu, and 吳政熹. "On Fast Position Control of Three-phase Induction Motors." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/18807807020077194087.

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碩士
國立雲林科技大學
機械工程研究所
86
A simple position control algorithm is devised for three-phase induction motors. Instead of coping directly with the complicated mathematical equations, the research tackles the control problem from a physical point of view, namely from the torque-speed characteristics of an induction motor. Itis shown that taking advantage of the torque-speed curves, fast and accurate position control can be achieved with a proportional algorithm. The angular displacement is the only state variable used in feedback loop, and it is not required to measure or estimate the angular velocities. The result is an easy-to-implement and reliable controller. Experimentation is conducted on two different squirrel-cage induction motors and different control algorithms are compared. It is found that adding velocity feedback (derivative control) to the algorithm does not help in the control response. Comparisons are also made with a permanent-magnet DC motor. It is found that using the proposed algorithm the induction motors can have a speed of response comparable to that of DC motors.

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46

GAO, BIN-FENG, and 高斌峰. "Torques Calculation of a Novel Three-phase Induction Motor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/10287826667385956138.

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碩士
國立雲林科技大學
電機工程系
104
The induced torque calculation of a novel three-phase induction motor is discussed in this thesis. Firstly, the structure design of the proposed motor obtained by consulting the electrical machinery and electrical design guidelines value of the parameters of the equivalent circuit are calculated. The results allow the characteristics of this novel three-phase induction motor to be found. Secondly, the variation of the induced torque during rotation is deducted based on the electromagnetism under ideal conditions. The results will be validated with the values obtained by the equivalent circuit. In addition, by changing expand angle of stator core, diameter of stator copper wire, expand angle of rotor core and air-gap length, the influences of the parameters on motor’s characteristics are observed, and the outcomes can be the basis of designing a novel three-phase induction motor.

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47

Lee, Rong-Neng, and 李榮能. "Simulation of AC drives in three phase induction motor." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/41819435131761426279.

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碩士
國立中山大學
電機工程研究所
82
At present, the induction motor is the most popular electric machinery. There are considerably control technologies have been developed.This thesis deals with most popular drivers in the present market and the induction motor for establishing their mathematical models. Meanwhile , the characteristics of the drivers also have been simulated in the thesis. From the studies , we can have a better understanding of the effect of the driver equipment and choose adequate power electronics. To avoid disadvantageous effects with respect to the inverter to damage power electronics as a result of the induction motor fault, use data provided from the simulation to reduce the power failure probability or design appropriate protection devices. To make use of the digital simulation of the voltage source inverter, including the six-step、 the square wave PWM、 sinusoid wave PWM and optimal PWM , this thesis presents the analysis of the induction motor under abnormal operation conditions. In addition, built the vector control mathematical models and simulate the good dynamics characteristic, including under- rating speed constant torque operation and over-rating speed constant power operation of the induction motor. The main purpose of using software simulation is to reduce the time of the development of the hardware、save the capital and avoid waste of money and human resource.

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48

吳添保. "Design, modeling, and measurement of three-phase induction motors." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/86801152545773306179.

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49

Jhang, Yu-Hong, and 張鈺泓. "Characteristics Analysis of a Three-phase Transverse Flux Induction Motor." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29034848705645839074.

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碩士
國立雲林科技大學
電機工程系碩士班
101
This thesis presents a novel three-phase transverse flux induction motor, using electromagnetic theory and electrical design guidelines for this motor. By analyzing the characteristics of equivalent circuit, the motor in this proposal can enjoy higher efficiency and better power factor in comparison with existing low- power three-phase induction motor. Then, Ansoft, the commercial finite element analysis software is utilized to construct the 3D model of this novel three-phase transverse flux induction motor and simulate the motor characteristics. Finally, the motor parameters such as air gap length, number of turns, the copper wire diameter and others, are varied to show these parameters influence the motor performance, which serve as references for motor design.

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50

Chieh-Ming, Tang, and 湯杰明. "Performance Analysis of a Three-phase Induction Motorunder Voltage Sags." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/34578539216495245742.

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碩士
國立雲林科技大學
電機工程系碩士班
94
This thesis discusses the steady-state performance of a three-phase induction motor under voltage sags. The positive- and negative-sequence equivalent circuits of the induction motor are used to analyze the effects of voltage sags on the induction motor. This thesis also uses the Universal Machine module of the Electromagnetic Transients Program (EMTP) to simulate both steady-state and transient characteristics of the motor under voltage sags to validate the results obtained by the analytical method.

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Dissertations / Theses on the topic 'Three phase induction machine'

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