Tesis sobre el tema "Multiphase induction motor drive"
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Mosadeghi, Hadi. "Modeling and control of a fault-tolerant multiphase induction motor drive". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Buscar texto completoGule, Nkosinathi. "Analysis and evaluation of brush-DC equivalent controlled multiphase cage induction machine drive". Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6489.
Texto completoENGLISH ABSTRACT: The multiphase induction machine drive has been under investigation for the last half century. Although it offers several attractive advantages over the conventional three-phase induction machine drive, it is restricted to highly specialised applications. One aspect of the multiphase induction machine drive is the complexity of the control algorithm for decoupled flux and torque control. The complexity, arising from the required coordinate transformations, increases with increase in the number of phases of the machine. Recently, a method that allows the control of a six-phase induction machine drive without any coordinate transformations was developed and tested. This new control technique allows the control of the machine to be similar to that of dc machines through the use of special trapezoidal-shaped stator current waveforms. These stator phase current waveforms consist of field (flux) and torque current components, with flat-topped amplitudes allowing a stator phase to act alternately in time as either a flux or a torque producing phase. The idea is to have a number of stator phases acting as flux producing phases, whilst the remaining phases act as torque producing phases at each time instance. This dissertation takes a further step in the research on this particular control technique. As the control method relates directly to the brush-dc machine operation, in this dissertation, the control method is defined as a “brush-dc equivalent” (BDCE) control method. First, in this dissertation, a simple analytical method is developed to determine a defined optimal ratio of the number of field to the number of torque phases of a multiphase induction machine that utilises trapezoidal stator current waveforms. The method is applied to induction machines with up to fifteen stator phases. Finite element analysis is used to verify the validity of the developed criterion and to verify the square-like air gap flux density. Secondly, in this dissertation, an analytical method for predicting and evaluating the rotor bar current waveform of a cage multiphase induction machine is proposed. The method is based on the Fourier transform and the winding function theory under linear condition assumptions. The method also allows for the calculation of the electromagnetic torque and rotor bar losses. Skin effect is considered in the calculation of the rotor bar resistance of the machine. Again, finite element analysis is used to verify the analytically calculated results. The developed method can be expanded and used to evaluate the rotor current waveform of any multiphase induction machine supplied with any stator current waveforms. The BDCE control method is implemented on a prototype nine-phase cage-rotor induction machine drive. A nine-phase inverter and control system are developed for supplying the nine-phase induction machine with the trapezoidal stator current waveforms. Rotor current waveform measurements are taken on a specially designed rotor to verify the analytically predicted waveform. The linear relationship of the developed torque and torque current of the proposed BDCE control method is verified through measurements. Through the comparison of analytical calculated results with finite element calculated and measured results, it is shown in this dissertation that the developed analytical techniques can be used in the design and performance analysis of multiphase induction machines. Also, from the results, it is clear that the new control technique works remarkably well even in the flux weakening region. However, outstanding aspects, such as efficiency and generated torque quality of the proposed drive still need to be investigated further.
AFRIKAANSE OPSOMMING: Die multifase induksiemasjien aandryfstelsel word in die laaste halwe eeu al in navorsing ondersoek. Alhoewel dit verskeie aantreklike voordele bied bo die konvensionele driefase induksiemasjien aandryfstelsel, is dit beperk tot hoogs gespesialiseerde aanwendings. Een aspek van die multifase induksiemasjien aandryfstelsel is die kompleksiteit van die beheer algoritme vir ontkoppelde vloed en draaimoment beheer. Die kompleksiteit, wat voortspruit uit die vereiste koördinaat transformasies, neem toe met toename in die aantal fases van die masjien. Onlangs is 'n metode wat die beheer van ’n sesfase induksiemasjien sonder enige koördinaat transformasies doen, ontwikkel en getoets. Hierdie nuwe beheertegniek maak die beheer van die masjien soortgelyk aan dié van GS masjiene deur die gebruik van spesiale trapezium-vormige statorstroom golfvorms. Hierdie stator fasestroom golfvorms bestaan uit veld- (vloed-) en draaimoment-stroom komponente met plat amplitudes, sodat 'n statorfase om die beurt in tyd optree as óf' ’n vloed of 'n draaimoment genereerde fase. Die idee is om 'n aantal statorfases te hê wat as vloed genereerde fases dien, terwyl die oorblywende fases as draaimoment genereerde fases optree op enige tydstip. Hierdie tesis neem 'n verdere stap in die navorsing op hierdie spesifieke beheertegniek. Met die beheermetode wat direk verband hou met borsel-GS masjien werking, word in hierdie proefskrif die beheermetode as 'n "borsel-GS ekwivalente" ["brush-DC equivalent" (BDCE)] beheermetode gedefinieer. In die eerste plek word in hierdie proefskrif 'n eenvoudige analitiese metode ontwikkel om ’n gedefinieerde optimale verhouding van die aantal veld tot die aantal draaimoment fases van 'n multifase induksiemasjien te bepaal, wat van trapesoïdale statorstroom golfvorms gebruik maak. Die metode word toegepas op induksiemasjiene met tot vyftien statorfases. Eindige element analise is gebruik om die geldigheid van die ontwikkelde kriterium te verifieer en om die vierkantvormige luggaping vloeddigtheid te verifieer. In die tweede plek word in hierdie proefskrif 'n analitiese metode vir die voorspelling en evaluering van die rotorstaafstroom golfvorm van 'n kourotor multifase induksiemasjien voorgestel. Die metode is gebaseer op die Fourier transform en die wikkelingsfunksie teorie onder lineêre-toestand aannames. Die metode wend hom ook daartoe tot die berekening van die elektromagnetiese draaimoment en rotorstaafverliese. Die huideffek word in ag geneem in die berekening van die rotorstaafweerstand van die masjien. Weereens is eindige element analise gebruik om die analitiese berekende resultate te verifieer. Die ontwikkelde metode kan uitgebrei en gebruik word om die rotorstroom golfvorm van van enige multifase induksiemasjien te evalueer wat gevoer word met enige statorstroom golfvorms. Die BDCE beheermetode is toegepas op 'n prototipe negefase kourotor induksiemasjien. 'n Negefase omsetter en beheerstelsel is ontwikkel vir die toevoer van die trapesoïdale statorstroom golfvorms aan die negefase induksiemasjien. Die rotorstroomgolfvorm metings is geneem op 'n spesiaal ontwerpte rotor om die analitiese voorspelde golfvorm te verifieer. Die lineêre verwantskap tussen die ontwikkelde draaimoment en draaimomentstroom van die voorgestelde BDCE beheermetode is geverifieer deur metings. Deur die analitiese berekende resultate met die eindige element berekende en gemete resultate te vergelyk, wys hierdie proefskrif dat die ontwikkelde analitiese tegnieke gebruik kan word in die ontwerp en werkverrigting analise van ’n multifase induksiemasjien. Vanuit die resultate is dit ook duidelik dat die nuwe beheertegniek besonder goed werk, selfs in die vloedverswakking spoedgebied. Egter, uitstaande aspekte soos effektiwiteit en genereerde draaimoment kwaliteit van die voorgestelde aandryfstelsel moet nog verder ondersoek word.
Esuri, Abdulhamid H. "Two-phase inverter/induction motor drive". Thesis, Loughborough University, 1991. https://dspace.lboro.ac.uk/2134/33109.
Texto completoBharadwaj, Aravind S. "Vector controlled induction motor drive systems". Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172143/.
Texto completoMosskull, 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.
Texto completoZhang, Yong. "A single-pulse cycloconverter induction motor drive". Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260012.
Texto completoAcar, Akin. "Implementation Of A Vector Controlled Induction Motor Drive". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.
Texto completoSünter, Sedat. "A vector controlled matrix converter induction motor drive". Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/12965/.
Texto completoLiang, Darwin Tat Wai. "Simulation and analysis of induction motor drive systems". Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1427.
Texto completoSalmon, John C. "A variable speed unipolar induction motor inverter drive". Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46449.
Texto completoIshrat, Tajrin. "Slip control for trains using induction motor drive". Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/199908/1/Tajrin_Ishrat_Thesis.pdf.
Texto completoSumner, M. "Vector controlled induction motor drive using transputer parallel processors". Thesis, University of Nottingham, 1990. http://eprints.nottingham.ac.uk/14104/.
Texto completoKumara, I. N. Satya. "Speed sensorless field oriented control for induction motor drive". Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430695.
Texto completoMohamed, Abdulatif Abdusalam. "Modelling and simulation of a cycloconverter induction motor drive". Thesis, De Montfort University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391545.
Texto completoPalmer, P. R. "A unipolar inverter drive for a cage induction motor". Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37811.
Texto completoRind, S. J. "Speed sensorless induction motor drive control for electric vehicles". Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3008062/.
Texto completoErtek, Talip Murat. "Speed Estimation Techniques For Sensorless Vector Controlled Induction Motor Drive". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606863/index.pdf.
Texto completoLeedy, Aleck Wayne Nelms R. M. "Analysis of DC power systems containing induction motor-drive loads". Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/doctoral/LEEDY_ALECK_32.pdf.
Texto completoJiang, Shuzhong y 姜淑忠. "An advanced pole-changing induction motor drive for electric vehicles". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245407.
Texto completoAbdulrahman, Shakir M. "New optimal PWM strategies for a VSI induction motor drive". Thesis, Loughborough University, 1991. https://dspace.lboro.ac.uk/2134/7115.
Texto completoJÃnior, AntÃnio Barbosa de Souza. "Hybrid position controller for an field-oriented induction motor drive". Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13468.
Texto completoThis work describes the study and implementation of a hybrid control technique applied to the positioning of the rotor shaft in a three-phase induction motor (IM). The machine has been modeled using the field oriented control (FOC) strategy. In additional, it is used three controllers to obtain the design of the position loop, each one with different operating characteristics. Initially, two constant gain controllers are associated with the position loop diagram in the FOC technique in order to obtain a fastest response, with disturbance rejection and without overshoot. Therefore, it used a Proportional (P) controller based on Ziegler-Nichols tuning method so that a faster system response is achieved and a predictive control strategy called Generalized Predictive Control (GPC), based on Proportional â Integral controller tuning form, to smooth the overshoot caused by the P controller. Subsequently, seeking a more efficient performance of the position control in the IM, It used a control strategy based on fuzzy logic that takes into account the weighting of P and GPC controllers together. For purposes of validation, simulations and experimental results of the P, GPC and hybrid control strategies are presented. The simulation was set up in Matlab/Simulink and the experimental plant was implemented with a Digital Signal Controller (DSC), manufactured by Texas Instruments TMS320F2812. Analyzing the results, the Proportional demonstrated the fastest reference tracking, among the others techniques, with a settling time of 0.25 seconds, however with overshoot. The GPC controller presented a longer accommodation time, about 2 seconds and without overshoot. The application of the hybrid proposed technique combine the fast tracking reference of the P controller, about 1 second to reach the reference, and without overshoot as in the GPC controller results. Besides, the robust characteristic of both controllers was maintained in the hybridization proposed technique.
Este trabalho descreve o estudo e implementaÃÃo de uma tÃcnica de controle hÃbrida aplicada ao posicionamento do eixo de um motor de induÃÃo trifÃsico (MIT). O motor de induÃÃo foi modelado usando-se a estratÃgia de controle de campo orientado a fim de projetar para a malha de posiÃÃo trÃs controladores, cada um com diferentes caracterÃsticas de operaÃÃo. Neste caso, incorporou-se inicialmente à malha de posiÃÃo da estratÃgia de controle de campo orientado a aÃÃo de dois controladores de ganho constante com o objetivo de posicionar o eixo de forma rÃpida, com pouco sobressinal e com rejeiÃÃo à perturbaÃÃo. Desta forma, utilizou-se um controlador Proporcional (P) com sintonia baseada em Ziegler-Nichols de modo a se obter uma caracterÃstica mais rÃpida do sistema e, uma estratÃgia de controle preditivo denominada de GPC (Generalized Predictive Control) com o objetivo de suavizar a aÃÃo do controlador P em termos de elevado sobressinal considerando a sintonia do controlador GPC baseada em um controlador Proporcional-Integral (PI). Posteriormente, para se obter um desempenho mais eficiente do controle de posiÃÃo do MIT, utilizou-se uma estratÃgia de controle baseada em lÃgica fuzzy de modo a se levar em conta a ponderaÃÃo dos controladores P e GPC, conjuntamente. Para fins de validaÃÃo sÃo apresentados resultados da aplicaÃÃo das estratÃgias de controle P, GPC e hÃbrida no controle de posiÃÃo do MIT a partir de simulaÃÃes em ambiente Matlab/Simulink e atravÃs da implementaÃÃo do sistema de controle de posiÃÃo utilizando-se um processador digital de sinais, o DSP TMS320F2812 fabricado pela Texas Instruments. A partir dos resultados encontrados, o Proporcional demonstrou um rÃpido seguimento de referÃncia, dentre as tÃcnicas utilizadas, com tempo de acomodaÃÃo experimental de 0,25 segundos, porÃm com sobressinal. O controlador GPC apresentou um tempo de acomodaÃÃo maior, cerca de 2 segundos e sem sobressinal. A aplicaÃÃo da tÃcnica hÃbrida proposta conseguiu combinar o rÃpido seguimento de referÃncia do Proporcional, levando cerca de 1 segundo para alcanÃar a referÃncia, e sem sobressinal como o controlador GPC. AlÃm do que, como os controladores possuem uma caracterÃstica robusta tambÃm se garantiu essa propriedade para o hibridismo proposto.
Abdelsalam, Ahmed Kadry Ahmed. "Medium-voltage PWM indirect vector controlled induction motor drive with a long motor feeder". Thesis, University of Strathclyde, 2009. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21996.
Texto completoChikwanda, Herbert Simbarashe. "The naturally commutated, converter-fed, variable speed induction machine drive". Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47805.
Texto completoKelly, John William. "A novel control scheme for a pole-changing induction motor drive". Diss., Connect to online resource - MSU authorized users, 2007.
Buscar texto completoTitle from PDF t.p. (viewed on Apr. 16, 2009) Includes bibliographical references (p. 113-114). Also issued in print.
Skawinski, Grzegorz. "Fuel pump motor-drive systems for more electric aircraft". Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527520.
Texto completoPlascencia-Gonzalez, Jose Guillermo. "Design and implementation of a field-oriented induction motor control drive". Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/27224.
Texto completoPatel, 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.
Texto completoThere 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.
Legesse, Michael. "Coupled simulation of an indirect field oriented controlled induction motor drive". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116014.
Texto completoDinu, Andrei. "FPGA neural controller for three-phase sensorless induction motor drive systems". Thesis, De Montfort University, 2000. http://hdl.handle.net/2086/4132.
Texto completoAlolah, 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.
Texto completoKhumalo, Siboniso T. "Induction motor variable speed drive performance and impact on energy savings". Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/8751.
Texto completoESKOM, together with Municipalities distribute power at a line-to-line voltage of 400+/-10%. Hence in theory, the user ends up with a voltage of 340 to 440. In urban areas 2% voltage unbalance is considered acceptable, while 3% voltage unbalance is considered acceptable for rural areas. The combined effects of under or overvoltages coupled with "acceptable maximum" voltage unbalance is not understood or documented. This project is a comprehensive study of the effects of voltage unbalance in combination with under or overvoltages on induction machines (1M) variable speed drives. In addition the performance with PWM inverters connected to 1M via long cables is also studied. The project starts by an evaluation of previous work on the subject and related topics. Relevant conclusions are made based on the literature review in Chapter One. The second step of the project was to develop two test beds in the UCT Machine's Laboratory. The test beds are for performance testing of low (up to 15kW) and medium (up to 75kW) power 1M and their VSDs. The test bed losses are determined at 4 different operating points and documented. Several tests such as the blocked rotor and no load tests were undertaken to determine the machine parameters. A PSpice simulation model was developed and tested for the low voltage test bed. The test results compared well to simulation predictions. Furthermore, tests under unbalanced and overvoltage conditions were performed and the results verified with simulations. This proves that the developed PSpice model can reliably simulate the actual test bed for both balanced and unbalanced conditions. Moreover, it can be easily applied to model different size machines and drives. The information required includes: the motor parameters, drive dc-link parameters, modulation ratio (ma) and the switching frequency. The impact of voltage unbalance in drives with long cables between the inverter and motor is examined. A 36m long, 4-core, PVC insulated cable is used on the low voltage test bed for a case study. The model used for the cable is a lumped parameter model. The 1M model is also taken from the literature to include a high frequency branch, to model the reflected voltage wave phenomenon. A basic analysis of energy savings in pumps and fans load associated with the application of variable speed drives is also done. Boiler feed-pumps from Tutuka power station are used as a case study that may be replicated for other applications in utilities or industry. The developed Excel Spreadsheet program to project the value of savings and determine the payback period is compared to an ABB program. The two results agree within an acceptable range. Therefore, the knowledge of the pumping system specifications and the cost of energy in kWh with the Energy Savings Program would enable one to project energy savings.
Zhang, Yong. "A DSP based variable-speed induction motor drive for a revolving stage". Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/273.
Texto completoWheeler, Jeremy Nicholas. "Back-to-back converters for variable speed motor drive applications". Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294550.
Texto completoAd'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.
Texto completoHerwald, Marc A. "Control Design and Analysis of an Advanced Induction Motor Electric Vehicle Drive". Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/32934.
Texto completoMaster of Science
Kanekal, Ramesh V. "Modeling, simulation and analysis of an indirect vector controlled induction motor drive". Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/76443.
Texto completoMaster of Science
Wu, Zhan-Yuan. "Energy efficient PWM induction machine drives for electric vehicles". Thesis, University of Sheffield, 2000. http://etheses.whiterose.ac.uk/14622/.
Texto completoNovinschi, Anca. "Simulation and implementation of rotor flux control for an induction motor". Thesis, De Montfort University, 1998. http://hdl.handle.net/2086/5208.
Texto completoŠkoda, 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.
Texto completoShieh, Ching-Tsung y 謝錦聰. "Adaptive Speed Control for Induction Motor Drive". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/m5d4zv.
Texto completo逢甲大學
自動控制工程所
90
Abstract In order to deal with the parameter variation and load torque disturbance of the induction motor(IM), a model reference adaptive control(MRAC) for speed controller based on Lyapunov stability theorem is proposed in this thesis to control the speed of induction motor. Based on stator current and velocity feedback signals, the adaptive controller is easy to be implemented. In simulation and experimental results, induction motor operating variation speed、load disturbance the MRAC method shows well robust performances compared with classical PI controller.
Zhong, Xiu-Guo y 鐘秀國. "A Novel RFOC Sensorless Induction Motor Drive". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/99158861238251916520.
Texto completo國立清華大學
電機工程學系
93
Abstract Due to the influence of greenhouse effects and the fast consumption of limited petroleum, the goverment of each nation has implemented different energy conservation policies to reduce the impact to the environment as well as enhance its national competitive power. Presently, lots of induction motors have been applied to drive various compressors、 pumps、 refrigerators and fans in refrigeration and air conditioning systems. In fact, it is the major motivation of this research to try to simplify the existing mature induction servo motor control technique and apply to the refrigeration and air conditioning systems where accurate control performance reguirement is not very critical. Basically, the major contributions of this thesis may be summarized as follows. First, a novel rotor flux oriented control strategy for induction motors is proposed to obviate the use of two current sensors as well as two voltage sensors. As a result, the cost can be reduced without scarifying the dynamical performance of the conventional rotor flux oriented control. Second, a new speed estimator is proposed for estimating the motor speed to obviate the use of an expensive encoder. Third, in view of the negative impact due to detuning effect of parameter variations, a new on-line parameter identification method is proposed to update the parameters of the controller. Finally, a fully digital controller is implemented based on the proposed theoretional basis for the induction motor drive, by using a high speed digital signal processor, namely DSPTMS320F2812. Naturally, not only the number of hardware components can be reduced but also the system reliability and flexibility are enhanced.
"IMPLEMENTATION OF A VECTOR CONTROLLED INDUCTION MOTOR DRIVE". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.
Texto completoRakesh, P. R. "PWM Techniques for Split-Phase Induction Motor Drive". Thesis, 2014. http://hdl.handle.net/2005/3136.
Texto completoHUANG, CHIH-YI y 黃志毅. "Implementation of High Performance Induction Motor Drive System". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/86571539347420328066.
Texto completo國立成功大學
電機工程學系
88
This dissertation proposes an induction motor drive with current and torque control. The current control based on the current error with the current controller yields the control signal of current controller. The torque control based on the torque error with the torque controller yields a control signal of torque controller. According to the output signal of current controller and torque controller, the appropriate voltage vector is selected by using a look-up table to control the induction motor drive to obtain a rapid speed response. The torque controller, current controller, and stationary reference frame transform are constructed by the hardware which reduce the running time of the microcomputer to obtain a high performance drive. Meanwhile, employing the advantages of the added zero voltage vector to reduce the inverter switching frequency greatly increasing the efficiency of the inverter. This dissertation also presents a control scheme for an induction motor drive which consists of a compensator, neural network identification (NNI) and neural network load torque estimator (NNLTE) based on the conventional proportional-integral (PI) controller. The NNI is a two-layer neural network which uses a projection algorithm to estimate the parameters of the induction motor and to regulate the gain of the compensator such that the response of the induction motor follows that of the nominal plant. The NNLTE is a two-layer neural network which uses the steepest descent algorithm to estimate the load disturbance and forward feed resulting in equivalent control such that the speed response of the induction motor is robust against the load disturbance. Computer simulations and experiment results demonstrate that the proposed method can obtain a high performance induction motor drive.
Liu, Wei-Kuo y 劉偉國. "Nonlinear Control for Linear Induction Motor Drive System". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/74455839173408915402.
Texto completo元智大學
電機工程研究所
89
Abstract The purpose of this thesis is to develop a sliding-mode feedback linearization control (SMFLC) system and an adaptive optimal control(AOC) system for the high-precision position control of a linear induction motor (LIM). First, the driving cricuit of the LIM is developed and the nonlinear decoupled control technique is adopted to decouple the thrust force and the flux amplitude of the LIM. Then, a SMFLC system, which is comprised of a sliding-mode flux and a sliding-mode position controllers, is designed in order to increase the robustness of LIM drive system. Moreover, to relax the requirement of the secondary flux in the SMFLC system, an adaptive flux observer is proposed to estimate the secondary flux. The control laws of the SMFLC system are derived in the sense of Lyapunov stability theorem such that the asymptotically stability of the control system can be guaranteed even under the possible occurrence of uncertainties. In addition, an AOC system is designed to increase the system control performance. In the AOC system, an adaptive uncertainty observer is used to estimate the bound of uncertainties for confronting the shortcoming in the traditional optimal control system. The control laws of the AOC system also are derived in the sense of Lyapunov stability theorem, so that system-tracking stability can be guaranteed. Finally, the effectiveness of the proposed control schemes is verified by both numerical simulation and experimental results.
Chao, Kuei-Hsiang y 趙貴祥. "SPEED SENSORLESS INDIRECT FIELD-ORIENTED INDUCTION MOTOR DRIVE". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/17755466314729907086.
Texto completo國立清華大學
電機工程學系
88
The development of a speed sensorless indirect field-oriented (IFO) induction motor drive fed by a soft-switching inverter is studied in this dissertation. The zero-voltage transition (ZVT) technique is employed to reduce the switching losses and voltage stresses of inverter switches. The proposed soft-switching inverter is formed from the traditional pulse width modulated (PWM) inverter by simply augmenting with auxiliary resonant circuits, and the soft switching is achieved through applying PWM switching control signals with suitable delays for the main and auxiliary switches. No additional voltage and current sensors are required in implementation. In the development of the proposed soft-switching inverter, the circuit operations and derivations of governing equations in various modes are described in detail. And accordingly, the circuit design procedure is derived. Next, an improved speed estimator via parameter uncertainty cancellation and its application to the IFO induction motor drive are presented. The speed estimation errors of a V-I model based adaptive speed observer due to motor parameter variations are analyzed. Then a novel compensation scheme is developed to cancel the effects of parameter variations on the speed estimation performance. The variable structure system (VSS) controller with the detected estimation error signal as its input is employed to realize the proposed compensation scheme. As to the development of high-performance speed controllers, a proportional plus integral-derivative (PI-D) two-degrees-of-freedom controller (2DOFC) is first designed for an ideal IFO induction motor drive at nominal case to meet the desired speed responses. In addition to the tracking and regulation speed control specifications, the effects of command change rate as well as control effort are also considered in the proposed design procedure. As the variations of motor drive parameters occur, the control performance of the detuned IFO induction motor drive will be greatly degraded. A compensation signal is yielded by the proposed fuzzy robust controller (FRC) to preserve the prescribed responses. In the generation of compensation signal, the compromise between the control effort and the performance is considered through a varying weighting factor, which is tuned by a fuzzy controller. Finally, the system dead-time of motor drive using estimated speed as feedback signal will be significantly enlarged, and this may significantly affect the closed-loop operating stability. Thus the fuzzy robust speed controller design for the sensorless IFO motor drive considering the effect of dead-time is further presented. The validities of all the proposed circuits and controllers are verified by some simulation and measured results.
Wang, Shing Shiung y 王信翔. "High efficiency indirect field-oriented induction motor drive system". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/45003371175825489838.
Texto completoChiang, Kun-Lin y 江坤霖. "Design and implementation of a sensorless induction motor drive". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/v6q88h.
Texto completo國立臺北科技大學
電力電子產業研發碩士專班
98
The objective of this thesis is to design and implementation a sensorless induction motor drive. In order to find the rotor flux angle from stator voltages and currents by injecting high frequency signal. The difference of impedances between d axis and q axis of the measurement reference frame is introduced by analyzing the equivalent circuit of the induction machine. Using the difference of impedances caused by signal injecting to track the rotor flux angle and estimate synchronous speed. Experimental system of this thesis includes inverter, induction machine, digital signal interface CP1104 and dSPACE DS1104. The experimental results show that the high frequency injection method has stable performance, even under heavily loaded condition.
Albert, Liu y 劉大川. "DSP-Based Robust Stator-Flux-Oriented Induction Motor Drive". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/31743230857697587013.
Texto completo中原大學
電機工程研究所
86
To solve the problem of detuning due to parameter variations in the currentdecoupled control of a direct stator-flux-oriented induction motor (IM) drive,two approaches for the rotor time-constant estimation are presented in thisstudy. The first approach is based on the model reference adaptive system (MRAS) using an energy function, and the second approach is based on thesliding mode technique. The estimated rotor time-constant is used to updatethe rotor time-constant in the current decoupled controller on line, whichis designed to decouple the torque and flux in the stator flux field-orientedcontrol. To increase the accuracy of the estimated rotor time-constant, theestimation methods is implemented using a digital signal processor (DSP). Theeffectiveness of the proposed estimation methods is demonstrated by some simu-lation and experimental results. Moreover, the influence of the variations ofmotor parameters to the accuracy of the proposed estimation approach isdiscussed.
Li-Chun, Liu y 劉立群. "A Speed Observer for Vector-Controlled Induction Motor Drive". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/18191609887426742445.
Texto completo國立臺灣科技大學
電機工程系
87
The purpose of this thesis is to investigate the application of the model reference adaptive system (MRAS) for the sensorless vector-controlled induction motor drive. According to the basic scheme of the model reference adaptive system, we can consider the induction motor as a reference model and the full-order observer as an adjustable model. The rotor speed, treated as a parameter of adjustable model, can be estimated by the state error between the reference model and adjustable model. Simultaneously, the rotor flux can be obtained from full-order observer. The approach is verified to be hyperstable with Popov''s criterion. In the experimental setup, the control program is developed on the PC-Based Motor Controller Development System. First, MATLABO and SIMULINKO are used for computer-aided design and system simulation. Then, the Real-Time WorkshopO produces code directly from Simulink models, and tested on a TECO 1-hp induction motor supplied by RHYMEBUS RM5 inverter. Both Simulation and experimental results showed that the scheme is effective.