Дисертації з теми "Multiphase induction motor drive"
Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Multiphase induction motor drive.
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Multiphase induction motor drive".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
1
Mosadeghi, Hadi. "Modeling and control of a fault-tolerant multiphase induction motor drive." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Знайти повний текст джерелаАнотація:
The conventional standard three-phase induction motors cannot operate inherently after the loss of a phase. The two-phase operation of a three-phase induction motor cannot supply the necessary performance in terms of torque and output power in applications that require high reliability such as electric traction
applications, and electric ship propulsion. Therefore, one of the means to overcome this drawback is the addition of more phases to the motor, which forms the main focus of this thesis. This research aims to develop the control system of a six-phase induction motor with a single neutral point, which can function in both the six-phase
(healthy) and five-phase (faulty) modes. The characteristics of this motor serve the purpose of reliable operation in case of a loss of a phase or more phases. Three subspaces were introduced to separately map fundamental, third, and fifth harmonics of the air-gap magnetic field. The Indirect Field-Oriented Control (IFOC) was considered to control the motor through PI controllers under normal operation and resonant PI controllers under faulty operation. The analysis of the configuration has been done through the Full Order Transformation (FOT) method. In conclusion, it was shown that the developed drive appears promising in so far
as it maintains performance quality under faulty conditions, far better than the conventional three-phase design.
2
Gule, 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.
Повний текст джерелаАнотація:
Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.ENGLISH 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.
3
Esuri, Abdulhamid H. "Two-phase inverter/induction motor drive." Thesis, Loughborough University, 1991. https://dspace.lboro.ac.uk/2134/33109.
Повний текст джерелаАнотація:
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.
4
Bharadwaj, Aravind S. "Vector controlled induction motor drive systems." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172143/.
Повний текст джерела
5
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.
Повний текст джерела
6
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.
Повний текст джерела
7
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.
Повний текст джерелаАнотація:
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.
8
Sünter, Sedat. "A vector controlled matrix converter induction motor drive." Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/12965/.
Повний текст джерелаАнотація:
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.
9
Liang, Darwin Tat Wai. "Simulation and analysis of induction motor drive systems." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1427.
Повний текст джерела
10
Salmon, John C. "A variable speed unipolar induction motor inverter drive." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46449.
Повний текст джерела
11
Ishrat, 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.
Повний текст джерелаАнотація:
This research is a railway industry related project, which is concerned with finding improvements in railway traction and wheel slip control in electric drives. A new approach was developed to detect the unknown and immeasurable rail surface. And a novel identification scheme was used to identify the best operating friction level. A new switching controller was operated by the induction motor controller under all possible train operating conditions. Aspects of the study were validated in the laboratory experiment. By exploring the in-rail track condition detection, the best drive torque and desired slip in the railway field were identified.
12
Sumner, M. "Vector controlled induction motor drive using transputer parallel processors." Thesis, University of Nottingham, 1990. http://eprints.nottingham.ac.uk/14104/.
Повний текст джерелаАнотація:
This thesis describes the design and construction of a high performance induction motor drive, controlled by a network of parallel (INMOS) Transputer processors. The flexibility and high computational ability of the controller is demonstrated by the implementation of three forms of indirect vector control for the induction motor (here termed "V-Type, "V-Type with Current Feedback" and "I-Type") on two motor drive rigs. Results show that V-Type control with current feedback is superior, and that on-line parameter estimation (namely the rotor time constant) is required. The controller has been expanded to incorporate two parameter identification strategies for assessment. The first, termed "Reactive Power Measurement", has proved successful in matching the controller value of rotor time constant to the actual machine value of rotor time constant. The second, termed "PRBS Injection with Cross- Correlation" has proved inconclusive and is the subject of on-going research. The performance of the transputer parallel processing network for real time control is discussed. This assessment is felt to be significant since parallel architectures are likely to become increasingly exploited as the processors become cheaper, more powerful and flexible, and with enhanced system support.
13
Kumara, 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.
Повний текст джерела
14
Mohamed, 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.
Повний текст джерела
15
Palmer, P. R. "A unipolar inverter drive for a cage induction motor." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37811.
Повний текст джерела
16
Rind, S. J. "Speed sensorless induction motor drive control for electric vehicles." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3008062/.
Повний текст джерелаАнотація:
Fast diminishing fossil fuel resources, deterioration in air quality and concerns for environmental protection, continuously promote the interest in the research and development of Alternative Energy Vehicles (AEVs). Traction motor drive is an integral part and common electric propulsion system in all kinds of AEVs. It plays an utmost significant role in the development of electrified transport industry. Application of Induction Motor (IM) drive is not only limited to the domestic and industrial applications but also has an ubiquitous influence in the modern electrified transport sector. IM is characterized by a simple and rugged structure, operational reliability, low maintenance, low cost, ability to operate in a hostile environment and high dynamic performance. However, IM is one of the widely accepted choices by Electric Vehicles (EVs) manufacturer. At present, Variable speed IM drive is almost replacing the traditional DC motor drive in a wide range of applications including EVs where a fast dynamic response is required. It became possible after the technological advancement and development in the field of power switching devices, digital signal processing and recently intelligent control systems have led to great improvements in the dynamic performance of traction drives. Speed Sensorless control strategies offer better system’s reliability and robustness and reduce the drive cost, size and maintenance requirements. Sensorless IM drives have been applied on medium and high speed applications successfully. However, instability at low speed and under different load disturbance conditions are still a critical problem in this research field and has not been robustly achieved. Some application such as traction drives and cranes are required to maintain the desired level of torque down to low speed levels with uncertain load torque disturbance conditions. Speed and torque control is more important particularly in motor-in-wheel traction drive train configuration EVs where vehicle wheel rim is directly connected to the motor shaft to control the speed and torque. The main purpose of this research is to improve the dynamic performance of conventional proportional-integral controller based model reference adaptive system (PI-MRAS) speed observer by using several speed profiles under different load torque disturbance conditions, which is uncertain during the whole vehicle operation apart from the vehicle own load. Since, vehicle has to face different road conditions and aerodynamic effects which continuously change the net load torque effect on the traction drive. This thesis proposes different novel methods based on the fuzzy logic control (FLC) and sliding mode control (SMC) with rotor flux MRAS. Numerous simulations and experimental tests designed with respect to the EV operation are carried out to investigate the speed estimation performance of the proposed schemes and compared with the PI-MRAS speed observer. For simulation and experimental purpose, Matlab-Simulink environment and dSPACE DS-1104 controller board are used respectively. The results presented in this thesis show great performance improvements of the proposed schemes in speed estimation & load disturbance rejection capability and provide a suitable choice of speed sensoless IM drive control for EVs with cost effectiveness.
17
Ertek, 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.
Повний текст джерелаАнотація:
This work focuses on speed estimation techniques for sensorless closed-loop speed control of an induction machine based on direct field-oriented control technique. Details of theories behind the algorithms are stated and their performances are verified by the help of simulations and experiments.
The field-oriented control as the vector control technique is mainly implemented in two ways: indirect field oriented control and direct field oriented control. The field to be oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented control no flux estimation exists. The angular slip velocity estimation based on the measured or estimated rotor speed is required, to compute the synchronous speed of the motor. In the direct field oriented control the synchronous speed is computed with the aid of a flux estimator. Field Oriented Control is based on projections which transform a three phase time and speed dependent system into a two co-ordinate time invariant system. These projections lead to a structure similar to that of a DC machine control. The flux observer used has an adaptive structure which makes use of both the voltage model and the current model of the machine.
The rotor speed is estimated via Kalman filter technique which has a recursive state estimation feature. The flux angle estimated by flux observer is processed taking the angular slip velocity into account for speed estimation. For closed-loop speed control of system, torque, flux and speed producing control loops are tuned by the help of PI regulators. The performance of the closed-loop speed control is investigated by simulations and experiments. TMS320F2812 DSP controller card and the Embedded Target for the TI C2000 DSP tool of Matlab are utilized for the real-time experiments.
18
Leedy, 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.
Повний текст джерела
19
Jiang, Shuzhong, and 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.
Повний текст джерела
20
Abdulrahman, Shakir M. "New optimal PWM strategies for a VSI induction motor drive." Thesis, Loughborough University, 1991. https://dspace.lboro.ac.uk/2134/7115.
Повний текст джерелаАнотація:
The applications of robust squirrel-cage induction motors in variable speed inverter drive systems have increased considerably due to the availability of easily controlled semiconductor switching devices. One problem encountered in inverter drives is the non-sinusoidal nature of the supply voltage, which results in increased motor losses and harmful torque pulsations producing undesirable speed oscillations. The latter effects are negligible at high frequency operation, due to the damping effect of the rotor and load inertia. However, torque pulsations and speed ripple may be appreciable at low frequency, wore they may result in abnormal wear of gear-teeth or torsional shaft failure. Hence, in applications where constant or precise speed control is important, eg; machine tool, antenna positioning, traction drives etc., it is essential to establish a method for determining the magnitudes of these torque pulsations and speed ripple, as a first stage in minimizing or eliminating them. When a voltage source inverter is used in such applications, pulse width modulation (PWM) techniques are usually employed, whereby the quasi square waveshape is modulated so as to minimize or eliminate the low order harmonic voltage components and thereby reduce the torque pulsations. Recent investigations have shown that total elimination of low order components does not produce optimal efficiency or torque pulsations and speed ripple. minimization. This thesis describes new PWM strategies which does not rely on complete elimination of low order harmonics, but on controlling the magnitude and phase of these components to achieve a smooth rotor motion. Initially, a mathematical model for the inverter/induction motor drive was developed, based on numerical integration of the system differential equations. The changing topology of the inverter bridge was simulated using tensor techniques. Then an analytical method, based on harmonic equivalent circuit analysis was proposed for calculating the induction motor pulsating torque components under steady-state operating conditions, in terms of stator and rotor current harmonics. The accuracy of this method was verified by comparing its results with those obtained from the mathematical model developed earlier. This provided an extremely rapid, numerically stable and efficient means for evaluating harmonic current and torque components with balanced non-sinusoidal applied voltages. This method was then used to formulate the torque performance function necessary to determine the new optimal PWM switching strategies. Throughout the work, the predicted performance was extensively validated and supported by practical results obtained from an experimental rig specifically designed to drive the machine under different PWM techniques.
21
JÃnior, 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.
Повний текст джерелаАнотація:
CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel SuperiorThis 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.
22
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.
Повний текст джерелаАнотація:
This thesis studies two types of medium-voltage (MV) vector controlled PWM induction motor drives for long motor feeder applications, namely voltage source and current source based drives. As rectifiers and inverters are the main elements in any drive system, both are investigated, but with more emphasis on the inverter side. MV PWM current source rectifiers (CSR) usually use selective harmonic elimination as a modulating strategy which provides good harmonic reduction at a low switching frequency. The rectifier performance does not meet the IEEE 519 regulation concerning harmonics injected into the supply current. Two solutions are presented. First, line side passive filters for harmonic mitigation and power factor improvement. Second, shunt active power filters based on p-q theory, with a step-down high-frequency transformer. The presented solutions are compared to highlight their features and limitations. Several topologies can be used for PWM CSRs. A detailed study of the selection criteria for PWM CSR semiconductors is presented based on losses, physical size, and number of series devices. Utilization of a PWM voltage source inverter (VSI) drive system in long motor feeder applications leads to motor terminal over-voltage problems. Surge filters are used to mitigate this phenomenon. Among the various types of filters, the motor terminal RC filter and the inverter output RLC filter are common. A detailed investigation is presented of the effects of these filters on the VSI drive system. PWM current source inverter (CSI) drive systems are characterised by their motor friendly voltage behaviour and controlled short circuit capabilities. Therefore, a proposed indirect vector controlled PWM CSI drive is presented for long motor feeder applications. Performance comparison between PWM VSI and CSI drive systems for long motor feeder applications is performed to clarify features and limitations of each system. Motor voltage is needed for speed estimation but measurement of voltage/speed is impractical for long motor feeder drives. A model reference adaptive system speed estimator is proposed with a novel remote motor voltage calculator that depends on the inverter voltage and feeder parameters. Offset and drift problems that occur during the flux estimation process are solved by a proposed DC-offset eliminator.
23
Chikwanda, Herbert Simbarashe. "The naturally commutated, converter-fed, variable speed induction machine drive." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47805.
Повний текст джерела
24
Kelly, John William. "A novel control scheme for a pole-changing induction motor drive." Diss., Connect to online resource - MSU authorized users, 2007.
Знайти повний текст джерелаАнотація:
Thesis (Ph. D.)--Michigan State University. Dept. of Electrical Engineering, 2007.Title from PDF t.p. (viewed on Apr. 16, 2009) Includes bibliographical references (p. 113-114). Also issued in print.
25
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.
Повний текст джерелаАнотація:
The fuel systems fitted to the current generation of civil transport aircraft are rather complicated, due to the presence of multiple tanks, pumps, valves and complex pipeline systems. During fuel transfer between the tanks, when controlling the aircraft centre of gravity or engine feed and refuel operations, a number of pumps and valves are involved resulting in complex pressure and flow interactions. In order to minimise the pressure surges during sudden system changes and flow overshoot during fuel transfer and refuelling, different motor drive system control strategies have been investigated. It is proposed that the current control method of electrically driven centrifugal-type pumps could be replaced by improved open and closed loop strategies where the flow overshoot can be minimised and pressure surges reduced. Steady-state and dynamic models of an AC induction motor drive and typical aircraft fuel system pipework components have been developed. The validation of these models has been performed using experimental data obtained from a fuel test rig constructed at the University of Bath using water as the working fluid. The simulation results have been shown to agree well with those from experimentation. In addition, the induction motor has been modelled based on its physical properties using the Finite Element Method software MEGA. The investigated fuel system has been described in linear terms and its behaviour has been identified. It is shown that the system dynamic behaviour can be controlled/improved using well established closed loop proportional-integral control. An open loop technique of simultaneous pump and valve control has been proposed and validated using experimental results, resulting in a reduction of both the transient pressure surges and flow overshoot during sudden valve closures, showing significant performance improvements. Improved closed loop control strategies for the pump drive system have also been developed in simulation. These are based on adaptive proportional-integral-derivative and fuzzy logic control strategies.
26
Plascencia-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.
Повний текст джерелаАнотація:
This thesis describes the design and implementation of an induction motor field-oriented controller. Simulation studies are carried out on important aspects of the drive system, based on which a high-performance induction motor drive control is designed and implemented using a PC computer and interface hardware. The simulation software is based on a mathematical model that uses tensor techniques and includes the pulse width modulator and the flux, current, speed and position calculations.
27
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.
Повний текст джерелаАнотація:
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.
28
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.
Повний текст джерелаАнотація:
Conventionally, system simulations of induction motor drives use lumped parameters model of the motor. This approach assumes motor parameters to be constant during the entire operation of the drive. Unfortunately, these are known to vary significantly over the operating range of the motor due to factors such as magnetic saturation, skin effects, and operating temperature. The variations in motor parameters affect motor output and control parameters resulting in degraded drive performance. One way of overcoming this problem is by coupling the field model of the induction motor with the drive simulation. By replacing the lumped parameters model with the field model, the influence of different operating conditions on motor parameters can be taken into account dynamically. In this thesis such an approach is investigated by coupling the finite element analysis of an induction motor with the system simulation of the field oriented controlled drive. The results obtained for the coupled simulation are promising and possible future works to make this method of simulation more accurate and reliable are recommended.
29
Dinu, Andrei. "FPGA neural controller for three-phase sensorless induction motor drive systems." Thesis, De Montfort University, 2000. http://hdl.handle.net/2086/4132.
Повний текст джерела
30
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.
Повний текст джерела
31
Khumalo, 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.
Повний текст джерелаАнотація:
Bibliography: p. 132-134.ESKOM, 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.
32
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.
Повний текст джерелаАнотація:
Variable speed drive technology has advanced dramatically in the last 10 years with the advent of new power devices. In this study, a three phase induction motor drive using Insulated Gate Bipolar Transistors (IGBT) at the inverter power stage is introduced to implement speed and position control for the revolving stage in the Frederic Wood Theatre
This thesis presents a solution to control a 3-phase induction motor using the Texas Instruments (TI) Digital Signal Processor (DSP) TMS320F2407A. The use of this DSP yields enhanced operations, fewer system components, lower system cost and increased efficiency. The control algorithm is based on the constant volts-per-hertz principle because the exact speed control is not needed. Reflective object sensors which are mounted on concrete frame are used to detect accurate edge position of revolving stage. The sinusoidal voltage waveforms are generated by the DSP using the space vector modulation technique.
In order to satisfy some operating conditions for safe and agreeable operation, a look-up table, which is used to give command voltage and speed signals in software, is applied to limit the maximum speed and acceleration of the revolving stage. Meanwhile, a boost voltage signal is added at the low frequency areas to make the motor produce maximum output torque when starting.
A test prototype is then built to validate the performance. Several tests are implemented into the IGBT drive to explore the reason for unacceptable oscillations in IGBT’s gate control signals. Improvement methods in hardware layout are suggested for the final design.
33
Wheeler, 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.
Повний текст джерела
34
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.
Повний текст джерела
35
Herwald, Marc A. "Control Design and Analysis of an Advanced Induction Motor Electric Vehicle Drive." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/32934.
Повний текст джерелаАнотація:
This thesis is about the development and performance enhancement of an induction motor electric vehicle drive system. The fundamental operation of the induction motor drive hardware and control software are introduced, and the different modulation techniques tested are described. A software simulation package is developed to assist in the control design and analysis of the drive system. Next, to establish the efficiency gains obtained by using space vector modulation in the improved drive system, an inverter with hysteresis current control is compared to the same inverter with space vector modulation in steady state and on separate driving profiles. A method for determining induction motor harmonic losses is introduced and is based on obtaining the phase current harmonics from sampled induction motor stator phase currents obtained. Using a semi-empirical loss model, the induction motor losses are compared between different pulse width modulation control strategies throughout the torque versus speed operating region. Next, several issues related to the robustness of the control design are addressed. To obtain good performance in the actual vehicle, a new method for driveline resonance compensation is developed and proven to work well through simulation and experiment. Lastly, this thesis discusses the development of a new method to compensate for the gain and phase error obtained in the feedback of the d-axis and q-axis stator flux linkages. Improved accuracy of the measured stator flux linkages will be shown to improve the field oriented controller by obtaining a more accurate measurement of the feedback electromagnetic torque.Master of Science
36
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.
Повний текст джерелаАнотація:
Vector control technique is being widely used in ac motors drives for precise dynamic control of torque, speed and position. The application of vector control scheme to the induction motor drive and the complete modeling, analysis and simulation of the drive system are presented in this thesis. State space models of the motor and the speed controller and the real time models of the inverter switches and the vector controller are integrated to model the drive. Performance differences due to the use of PWM and hysteresis current controllers are examined. Simulation results of the torque and speed drive systems are given. The drive system is linearised around an operating point and the small signal response is evaluated.Master of Science
37
Wu, Zhan-Yuan. "Energy efficient PWM induction machine drives for electric vehicles." Thesis, University of Sheffield, 2000. http://etheses.whiterose.ac.uk/14622/.
Повний текст джерелаАнотація:
The viability of any electric vehicle is critically dependent on it having an acceptable range between charges, a feature which is ultimately dictated by the capacity of the battery energy store. Considerable improvements in vehicle range are possible, however, by ensuring the most effective use of this limited energy resource through the minimisation of the losses in the electric drive-train, i.e. the combined machine and power electronic controller. A particular consideration is that, for the majority of the time, the electric drive-train will be operating at part load. The thesis investigates the operation of induction motor based electric traction drive-trains, with a view to minimising the system loss over typical driving cycles. The study is based around a 26kW induction motor and IGBT inverter drive, which is typical of the technology used to power a small urban vehicle. A potential advantage of an induction motor based drive-train is the ability to vary the level of excitation field in the motor, and therefore the balance of iron and copper loss. The control of the supply voltage magnitude necessitates the use of some form of modulation on the output of the power converter. The method of modulation employed will influence the harmonic content of the supply to the motor, the level of parasitic harmonic loss in the machine and the switching losses of the power semiconductors. A theoretical study supported by experimental work on a DSP controlled drive is presented and used to determine the most appropriate modulation strategy at a given operating point to achieve an optimal balance between the motor copper, iron and harmonic loss and inverter switching and conduction loss. It is shown that compared to the established method of constant flux and fixed inverter switching frequency control, a significant reduction in the traction system loss can be achieved. Some different modulation schemes involve varying amounts of computational overhead in a DSP, the implementation of candidate modulation and control schemes has also been investigated to ensure the defined scheme is practically realisable.
38
Novinschi, Anca. "Simulation and implementation of rotor flux control for an induction motor." Thesis, De Montfort University, 1998. http://hdl.handle.net/2086/5208.
Повний текст джерела
39
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.
Повний текст джерелаАнотація:
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.
40
Shieh, Ching-Tsung, and 謝錦聰. "Adaptive Speed Control for Induction Motor Drive." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/m5d4zv.
Повний текст джерелаАнотація:
碩士逢甲大學
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.
41
Zhong, Xiu-Guo, and 鐘秀國. "A Novel RFOC Sensorless Induction Motor Drive." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/99158861238251916520.
Повний текст джерелаАнотація:
碩士國立清華大學
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.
42
"IMPLEMENTATION OF A VECTOR CONTROLLED INDUCTION MOTOR DRIVE." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.
Повний текст джерела
43
Rakesh, P. R. "PWM Techniques for Split-Phase Induction Motor Drive." Thesis, 2014. http://hdl.handle.net/2005/3136.
Повний текст джерелаАнотація:
A split-phase induction motor (SPIM) is obtained by splitting each of the three-phase stator windings of an induction motor into two equal halves. This results in two sets of three-phase windings with a spatial angle difference of 30◦ (electrical) between them. The two sets of windings are fed from two different voltage-source inverters for speed control of the split-phase motor drive. Low dc bus voltage requirement and improved torque profile are some of the advantages of the split-phase motor, compared to the normal three-phase induction motor.
A pulse width modulation (PWM) technique is used to produce the gating signals for the power semiconductor devices in the two inverters. The PWM technique can either be a carrier comparison (CC) based method or a space-vector (SV) based scheme. The carrier based PWM methods employ six modulating waves, which are compared against a common triangular carrier to generate the gating pulses. In space-vector based PWM schemes, the voltage reference is specified in terms of a rotating reference vector. In each subcycle, a set of voltage vectors are applied for appropriate durations of time to produce an average vector equal to the reference vector. Unlike three-phase induction motor drives, where the voltage vectors are two dimensional, the voltage vectors in the case of SPIM drive are four dimensional. This thesis presents a detailed survey on carrier-comparison based and space-vector based PWM techniques for the SPIM drive.
In this thesis, sine-triangle PWM (STPWM) is analyzed from a space-vector perspective. The set of voltage vectors applied and the sequence of application of the voltage vectors in each half-carrier cycle are studied. The analysis shows that the set of voltage vectors and the switching sequence employed by STPWM are different from those used by the well known SVPWM tech-niques.
Two other CC based PWM techniques, based on common mode injection, are considered for the SPIM drive. In one method, the common-mode signal is derived from all the six modulating signals, and is the same for both the inverters. In the second method, the common-mode signal is different for the two inverters; each common-mode signal is derived from the three-phase sinusoidal signals of the respective inverter. The study shows that the latter method has the highest dc bus utilization and results in the lowest total harmonic distortion (THD) among the CC PWM techniques.
An experimental comparison of the three carrier-comparison techniques with three well known space-vector PWM techniques is presented. Total harmonic distortion (THD) of the line current is measured at different modulation indices for all six techniques. The experimental results are obtained from a 6kW, 200V, 50Hz split-phase induction motor drive, with constant V /F ratio. The PWM techniques are implemented using an ALTERA cyclone II field programmable gate array (FPGA) digital controller.
One of the SV techniques, termed here as 4-dimensional 24-sector (4D24SEC) PWM is found to be the best in terms of line current THD among all the CC and SV based PWM techniques considered. However, compared to any carrier-based technique, implementation of the 4D24SEC PWM based on the space vector approach is found to be resource intensive. Hence, an equivalent carrier-based implementation of 4D24SEC PWM is proposed in this thesis. The feasibility of the proposed approach is verified experimentally, and is found to be consuming much less logical resources than the space-vector implementation (i.e. 4102 logical elements for the CC approach as against 33,655 logical elements for the SV approach).
A new space-vector PWM technique is also proposed in the thesis. This technique utilizes a new set of voltage vectors and a new switching sequence, which are motivated by the analyses of the carrier-based methods, presented earlier. The proposed technique is implemented, and is compared with other space-vector and carrier-based methods at different modulation indices and switching frequencies. The proposed PWM technique is found to have the same dc-bus utilization as the existing 4-dimensional SV based PWM techniques. The performance of the proposed method is found to be not better than existing 4-dimensional SV PWM methods. The possibilities for new switching sequence is being explored here.
44
HUANG, CHIH-YI, and 黃志毅. "Implementation of High Performance Induction Motor Drive System." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/86571539347420328066.
Повний текст джерелаАнотація:
博士國立成功大學
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.
45
Liu, Wei-Kuo, and 劉偉國. "Nonlinear Control for Linear Induction Motor Drive System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/74455839173408915402.
Повний текст джерелаАнотація:
碩士元智大學
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.
46
Chao, Kuei-Hsiang, and 趙貴祥. "SPEED SENSORLESS INDIRECT FIELD-ORIENTED INDUCTION MOTOR DRIVE." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/17755466314729907086.
Повний текст джерелаАнотація:
博士國立清華大學
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.
47
Wang, Shing Shiung, and 王信翔. "High efficiency indirect field-oriented induction motor drive system." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/45003371175825489838.
Повний текст джерела
48
Chiang, Kun-Lin, and 江坤霖. "Design and implementation of a sensorless induction motor drive." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/v6q88h.
Повний текст джерелаАнотація:
碩士國立臺北科技大學
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.
49
Albert, Liu, and 劉大川. "DSP-Based Robust Stator-Flux-Oriented Induction Motor Drive." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/31743230857697587013.
Повний текст джерелаАнотація:
碩士中原大學
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.
50
Li-Chun, Liu, and 劉立群. "A Speed Observer for Vector-Controlled Induction Motor Drive." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/18191609887426742445.
Повний текст джерелаАнотація:
碩士國立臺灣科技大學
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.