Dissertations / Theses on the topic 'Three phase induction motor'
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1
Wong, D. "Speed control of three-phase induction motors." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376194.
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Kneebone, Nigel J. "Efficiency and speed control of three-phase induction motors." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277167.
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Rajamani, Haile-Selassie. "High speed, three-phase induction motor drives for domestic appliances." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627054.
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Dinu, Andrei. "FPGA neural controller for three-phase sensorless induction motor drive systems." Thesis, De Montfort University, 2000. http://hdl.handle.net/2086/4132.
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Alolah, A. I. "Microprocessor controlled three-phase inverter for variable-speed induction motor drive." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371466.
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Bawana, Niyem Mawenbe. "Thermal Response in a Field Oriented Controlled Three-phase Induction Motor." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7740.
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The research conducted at the department of Electrical Engineering of the University of South Florida campus in Tampa only covers the electrical aspect of electric drives. However, the performance of electric machinery is significantly impacted by temperature variation. The
literature review shows three main control techniques in use today in electric drives namely, Scalar control, Direct Torque control and Field Oriented control.
This thesis presents a temperature rise of rotor bars, stator winding, stator core and stator frame in a running three phase field-oriented controlled induction machine. A literature search shows that none of research has been carried out to investigate a thermal response of a field-oriented controlled induction motor. With this motivation, we were able to implement a lumped parameters thermal model of a three-phase field-oriented IM in MATLAB Simulink, which allows us to determine that rotor bars have the highest temperatures rising to 84 degrees Celsius. This confirms that rotors bars are the hottest part of a running IM as stipulated in literature.
7
Patel, Sagarkumar. "Speed Control of Three-Phase Induction Motor Using Variable Frequency Drive." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10690223.
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There are various methods for speed control of induction motors. This paper specifically describes one of the methods: speed control using variable frequency. The proposed system is a MATLAB simulink model, which is a closed loop model designed to achieve desired speed control of a three-phase induction motor by varying its frequency. The simulink model has four main blocks, namely the inverter, synchronous machine, proportional integral control and current hysteresis control. For accuracy of output results and simplicity, we have used dq to abc transformation block and sin function block. The inverter is comprised of six integrated gate bipolar transistors (IGBTs), which are fired by gate pulses generated by current hysteresis control block. The inverter generates variable frequency and variable voltage output, which is given to motor terminals. The project presents the working principle of variable frequency drive (VFD), its performance, and the use of Pulse Width Modulation (PWM) in a three-phase inverter to control the frequency and thus the speed. The proposed method conformed to performance predictions and delivered the desired outputs.
8
Ad'doweesh, K. E. "A microprocessor based PWM inverter drive incorporating a three-phase induction motor." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371459.
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Venkatesh, Sridhar Chakravarthy. "The development of a digital controller for a three-phase induction motor." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35005.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.Includes bibliographical references (leaves 76-77).
by Sridhar Chakravarthy Venkatesh.
M.S.
10
Govindsamy, Matthew. "Sensorless speed estimation in three phase induction motors." Thesis, Port Elizabeth Technikon, 2002. http://hdl.handle.net/10948/139.
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This thesis proposes a technique to determine and improve the performance of a sensorless speed estimator for an induction motor based on Motor Current Signature Analysis (MCSA). The theoretical concepts underlying the parameter based observer are developed first and then the model of the observer is built using Simulink. The observer is developed based on Model Reference Adaptive System (MRAS). The dynamic performance of the observer and its behavior due to variation of machine parameters is studied. The error in speed estimated using this observer is shown and the ability of MCSA to retune the rotor speed from the stator current spectrum. The spectrum estimation technique has been implemented using a software routine in Matlab. Both the observer and MCSA techniques were implemented practically on an induction motor. The performance of the combined sensorless speed estimation system was tested and verified.
11
McKinnon, Douglas John Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Novel efficiency evaluation methods and analysis for three-phase induction machines." Awarded by:University of New South Wales. Electrical Engineering and Telecommunications, 2005. http://handle.unsw.edu.au/1959.4/21869.
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This thesis describes new methods of evaluating the efficiency of three-phase induction machines using synthetic loading. Synthetic loading causes the induction machine to draw full-load current without the need to connect a mechanical load to the machine's drive shaft. The synthetic loading methods cause the machine to periodically accelerate and decelerate, producing an alternating motor-generator action. This action causes the machine, on average over each synthetic loading cycle, to operate at rated rms current, rated rms voltage and full-load speed, thereby producing rated copper losses, iron loss and friction and windage loss. The excitation voltages are supplied from a PWM inverter with a large capacity DC bus capable of supplying rated rms voltage. The synthetic loading methods of efficiency evaluation are verified in terms of the individual losses in the machine by using a new dynamic model that accounts for iron loss and all parameter variations. The losses are compared with the steady-state loss distribution determined using very accurate induction machine parameters. The parameters were identified using a run-up-to-speed test at rated voltage and the locked rotor and synchronous speed tests conducted with a variable voltage supply. The latter tests were used to synthesise the variations in stator leakage reactance, magnetising reactance and the equivalent iron loss resistance over the induction machine's speed range. The run-up-to-speed test was used to determine the rotor resistance and leakage reactance variations over the same speed range. The test method results showed for the first time that the rotor leakage reactance varied in the same manner as the stator leakage and magnetising reactances with respect to current. When all parameter variations are taken into account there is good agreement between theoretical and measured results for the synthetic loading methods. The synthetic loading methods are applied to three-phase induction machines with both single- and double-cage rotors to assess the effect of rotor parameter variations in the method. Various excitation waveforms for each method were used and the measured and modelled efficiencies compared to conventional efficiency test results. The results verify that it is possible to accurately evaluate the efficiency of three-phase induction machines using synthetic loading.
12
Pye, Gregory. "Precision position control of a three-phase squirrel-cage induction motor using vector control." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357862.
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Chaudhari, Subodh. "Load based energy savings in three phase squirrel cage induction motors." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3749.
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Thesis (M.S.)--West Virginia University, 2004.Title from document title page. Document formatted into pages; contains x, 147 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 117-121).
14
Schoen, Randy R. "On-line current-based condition monitoring of three-phase induction machines." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/12952.
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Malliband, Paul Derek. "Wide speed range three-phase induction motors for domestic appliances." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614174.
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Liang, Bo. "Condition monitoring and fault diagnosis of three-phase induction motors." Thesis, University of Manchester, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488140.
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It is well known there are three main approaches to maintenance of machinery, namely breakdown maintenance, scheduled maintenance and preventive maintenance. Breakdown maintenance is practised when machines are operated until they fail before maintenance is carried out. This out-of-date maintenance policy is slowly being abandoned by industry. Scheduled maintenance relates to interrupting machinery at regular intervals for the purposes of maintenance and this policy is still being used in many areas even though it is expensive one. The third maintenance policy is that of preventive maintenance. This approach aims to perform machinery maintenance just before a fault occurs and therefore is used to optimise the maintenance function. The basis of this approach is fault detection, severity assessment and fault diagnosis collectively referred to as condition monitoring. The objective of machinery condition monitoring is to obtain the earliest possible warning of incipient damage or malfunction and to assist in the diagnosis of the subsequent cause. There are many books that focus on condition monitoring and fault diagnosis [1-3]. According to Matthew [4], machine condition monitoring is concerned with obtaining data that would aid in evaluating machinery mechanical and electrical integrity. It is the measurement of various parameters related to the mechanical and electrical condition of the machinery such as vibration, acoustic emission, temperature, oil pressure, oil debris, voltage, current, conductivity and corrosion which make it possible to determine whether the machine is healthy. In addition machinery models can be established for simulating and predicting the trend of changing parameters. These are parameters such as vibration, temperature, pressure, current and voltage that change as a result of differing operating condition, thus providing the maintenance engineer with prior knowledge that may be used for maintenance or improving the performance of the machine. It is generally accepted that condition monitoring offers many advantages.
17
Chan, Si Leong. "Novel Fuzzy-Neural Networks technology for diagnosing internal fault of three-phase squirrel cage induction motor." Thesis, University of Macau, 2008. http://umaclib3.umac.mo/record=b1807118.
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Belaroussi, Mohamed. "Intelligent real-time microcontroller of pulsewidth modulation controlled three-phase induction motors." Thesis, Robert Gordon University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303619.
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Ashnibha, Rmdan Abdussalm. "An investigation into current and vibration signatures of three phase induction motors." Thesis, Manchester Metropolitan University, 2012. http://e-space.mmu.ac.uk/314037/.
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This research aimed at investigating the relationship between three phase induction motors vibration (MVS) and current signatures (MCS). This is essential due to the cost of vibration measuring equipment and in cases where vibration of interest point is not accessible; such as electrical submersible pumps (ESP) used in oil industry. A mathematical model was developed to understand the effects of two types of induction motors common faults; rotor bar imperfections and phase imbalance on the motor vibration and current signatures. An automated test facility was developed in which 1.1 kW three phase motor could be tested under varying shaft rotation speeds and loads for validating the developed model. Time and frequency domains statistical parameters of the measured signals were calculated for fault detection and assessing its severity. The measured signals were also processed using the short time Fourier transform (STFT), the Wigner-Ville distribution (WVD), the continuous wavelet transform (CWT) and discrete wavelet transform (DWT) and wavelet multi-resolution analysis (MRA). The non-stationary components, representing faults within induction motor measured vibration and current signals, were successfully detected using wavelet decomposition technique. An effective alternative to direct vibration measurement scheme, based on radial basis function networks, was developed to the reconstruction of motor vibration using measurements of one phase of the motor current. It was found that this method captured the features of induction motor faults with reasonable degrees of accuracy. Another method was also developed for the early detection and diagnosis of faults using an enhanced power factor method. Experimental results confirmed that the power factor can be used successfully for induction motor fault diagnosis and is also promising in assessing fault severity. The suggested two methods offer inexpensive, reliable and non-intrusive condition monitoring tools that suits real-time applications. Directions for further work were also outlined.
20
Goynuk, Yilmaz. "Development Of An Electrical Machines Analysis And Optimum Design Software Package." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609788/index.pdf.
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In this study, three different programs are developed for the analysis of the
three-phase induction motor, single-phase capacitor type induction motor
and switched reluctance motor. The programs are developed by using Pascal
and C++ programming languages. In the performance calculations of motors,
analytical methods are used and these methods are tested for accuracy.
These programs have also capabilities to design an optimum motor, which
meets a set of performance, material and manufacturing constraints while
minimizing the weight or any other defined objective function.
In addition, in this study, an optimization tool is used to obtain an appropriate
optimization method for the design of different types of motors.
The software is tested over different commercial motors. The results illustrates
that the performance calculations and optimization approach of the
programs lead to good results.
21
Oliveira, Ãtila GirÃo de. "Neural classifier aplied in stator winding inter-turn short circuit in three-phase induction motors driven by frequency converter." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12285.
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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorThis dissertation reports applications of artificial neural networks to detect stator winding interturn fault of three phase induction motor drived by frequency inverter. The artificial neural networks, like Simple and Multilayer Perceptron, served as off-line classifiers to short-circuit fault condition or healthy condition. In the training of Multilayer Perceptron, two different algorithms are used: the error back-propagation, which is a classic algorithm, and the extreme learning machine, as a relative new alternative for the classic back-propagation. The new one is more worthwhile because of its implementation easiness and higher speed of computation. The database used on the training and validation of the networks is created from an experimental setting, therefore it is composed by true data. The attributes used as failuresâ indicators are selected from certain frequencies of the spectrum, based on some theories of current signature analysis. In the second instance, the technique of principal components analysis is employed. The results obtained for the designed classifiers are shown, and some considerations are made on their use in real time embedded applications, which is the most important projection for future researches.
Este trabalho deriva da aplicaÃÃo de redes neurais artificiais para a detecÃÃo de curto-circuito entre espiras em motor de induÃÃo trifÃsico, acionado por inversor de frequÃncia. As redes neurais artificiais, do tipo Perceptron Simples e Multicamadas, sÃo usadas para detectar falhas de curto-circuito no bobinamento estatÃrico de motores de induÃÃo trifÃsicos de forma off-line. Para treinamento do Perceptron Multicamadas sÃo usados dois algoritmos distintos: o error back-propagation, que figura como o algoritmo clÃssico na literatura especializada, e o extreme learning machine, que à uma alternativa, relativamente recente, ao algoritmo clÃssico. Este algoritmo à uma opÃÃo atraente para o desenvolvimento rÃpido de classificadores. O banco de dados usado para treinamento e validaÃÃo das redes à obtido a partir de experimentaÃÃo laboratorial, portanto composto de dados reais. Os atributos utilizados para a detecÃÃo da falha sÃo componentes de frequÃncia do espectro harmÃnico da corrente estatÃrica do motor. O critÃrio de escolha destas componentes, a priori, à fundamentado em resultados de investigaÃÃes prÃvias da assinatura de corrente e, em segunda instÃncia, à aplicada a tÃcnica de anÃlise de componentes principais. SÃo apresentados os resultados obtidospelos classificadores projetados, e feitas algumas consideraÃÃes quanto à utilizaÃÃo destes em aplicaÃÃo embarcada e em tempo real, que à a principal projeÃÃo de futuros trabalhos a partir do atual.
22
liu, Lih-shyh, and 劉立士. "Analysis Three-phase induction motor under unbalanced Three-phase Sources." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/85707135169259301413.
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碩士國立成功大學
電機工程學系
87
This thesis investigates the startup transients, dynamic and steady-state characteristics of a three-phase induction motor under unbalanced three-phase sources. Three stator-winding configurations, Y-connection without neutral line, Y-connection with neutral line, and △-connection, are respectively employed. The voltage unbalanced factors of the studied machine under voltage-magnitude and phase-angle variations of one phase are both studied using symmetrical components. The Electromagnetic Transients Program (EMTP) is also utilized to examine the transients, dynamic and steady-state performances of the studied motor under different values of voltage unbalanced factor.
23
GAO, BIN-FENG, and 高斌峰. "Torques Calculation of a Novel Three-phase Induction Motor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/10287826667385956138.
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碩士國立雲林科技大學
電機工程系
104
The induced torque calculation of a novel three-phase induction motor is discussed in this thesis. Firstly, the structure design of the proposed motor obtained by consulting the electrical machinery and electrical design guidelines value of the parameters of the equivalent circuit are calculated. The results allow the characteristics of this novel three-phase induction motor to be found. Secondly, the variation of the induced torque during rotation is deducted based on the electromagnetism under ideal conditions. The results will be validated with the values obtained by the equivalent circuit. In addition, by changing expand angle of stator core, diameter of stator copper wire, expand angle of rotor core and air-gap length, the influences of the parameters on motor’s characteristics are observed, and the outcomes can be the basis of designing a novel three-phase induction motor.
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Lee, Rong-Neng, and 李榮能. "Simulation of AC drives in three phase induction motor." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/41819435131761426279.
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碩士國立中山大學
電機工程研究所
82
At present, the induction motor is the most popular electric machinery. There are considerably control technologies have been developed.This thesis deals with most popular drivers in the present market and the induction motor for establishing their mathematical models. Meanwhile , the characteristics of the drivers also have been simulated in the thesis. From the studies , we can have a better understanding of the effect of the driver equipment and choose adequate power electronics. To avoid disadvantageous effects with respect to the inverter to damage power electronics as a result of the induction motor fault, use data provided from the simulation to reduce the power failure probability or design appropriate protection devices. To make use of the digital simulation of the voltage source inverter, including the six-step、 the square wave PWM、 sinusoid wave PWM and optimal PWM , this thesis presents the analysis of the induction motor under abnormal operation conditions. In addition, built the vector control mathematical models and simulate the good dynamics characteristic, including under- rating speed constant torque operation and over-rating speed constant power operation of the induction motor. The main purpose of using software simulation is to reduce the time of the development of the hardware、save the capital and avoid waste of money and human resource.
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Jhang, Yu-Hong, and 張鈺泓. "Characteristics Analysis of a Three-phase Transverse Flux Induction Motor." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29034848705645839074.
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碩士國立雲林科技大學
電機工程系碩士班
101
This thesis presents a novel three-phase transverse flux induction motor, using electromagnetic theory and electrical design guidelines for this motor. By analyzing the characteristics of equivalent circuit, the motor in this proposal can enjoy higher efficiency and better power factor in comparison with existing low- power three-phase induction motor. Then, Ansoft, the commercial finite element analysis software is utilized to construct the 3D model of this novel three-phase transverse flux induction motor and simulate the motor characteristics. Finally, the motor parameters such as air gap length, number of turns, the copper wire diameter and others, are varied to show these parameters influence the motor performance, which serve as references for motor design.
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Chou, Chuan, and 周銓. "Aeroacoustics Simulation and Experiment for a Three-Phase Induction Motor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/68tym4.
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碩士國立臺灣科技大學
機械工程系
107
The source of motor noise can be from mechanical, electro-magnetic, and aerodynamic. For high speed motor, the noise is dominated by aeroacoustics. In this thesis, we discussed with a three-phase induction motor. The noise is simulated by numerical method of computational aeroacoustics (CAA), then compare with experiment result for validation. The purpose of this research is to develop an analysis model to predict motor noise that generated by aeroacoustics. In order to obtain motor noise spectral, we perform experiment for the noise measurement at anechoic chamber. Also design a series of different variable factor in the experiment. By analysising measurement data for each cases, we can find that fan is the major sound source of aeroacoustics. In addition, simulation procedure has two parts, one is in fluid field, and another is in acoustic field. We use ANSYS Fluent to calculate fluid field in advance to obtain sound source of fan. And then the sound source we obtained will use boundary element method to calculate acoustic response for the receivers. Finally, we compare simulation result with experiment data, the consequence of comparison is very well. Proves that this calculation model is useful and provide motor designer a tool to proceed noise reduction in further design.
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Wang, Jhang-Yue, and 汪張育. "DSP Based Boost-type Three-phase Sensorless Induction Motor Drive." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/d68ypk.
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碩士國立虎尾科技大學
電機工程研究所
97
This thesis proposes a novel sensorless boost-type DC/AC motor drive based on DSP. Using a generalized zero vector technique, the proposed drive has several advantages such as higher output voltage to increase motor efficiency, reduced weight and space of battery. Adapted o 120 control strategy, the magnitude, phase and frequency of air-gap flux can be obtained for motor coil. Therefore, using those signals of the motor parameter can be modified in real time to achieve the real sensorless vector control. Finally, same experimental results are presented for verification.
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Huang, Jyun-Wei, and 黃俊偉. "A Novel High Efficiency Inverter for Three-phase Induction Motor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/v7kaa5.
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碩士國立虎尾科技大學
電機工程研究所
99
In this thesis a novel high efficiency inverter for three-phase induction motor is proposed. The proposed drive consists of DC/DC Buck converter and three-phase inverter. To maintain amplitude of motor current, hysteresis current control and space vector are adopted. Besides, the frequency of inverter output current also can be adjusted by output voltage of DC/DC Buck converter. Therefore, the proposed drive has lower switching loss, higher efficiency and better dynamic response.The constant stator current is used to control motor speed in closed loop control, completion of induction motor speed to keep const For fully digital control, TI DSP TMS320F28335 and Vissim development software are adopted to implement the control circuit. Hence, thr control circuit becomes more flexible and more small size. Finally, some experiment results are presented to verify the feasibility of the proposed motor drive.
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Wang, Chien-Chih, and 王建智. "Computer-aided Design of a Three-Phase Linear Induction Motor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/94799931801116557915.
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碩士桃園創新技術學院
機械工程系機械與機電工程碩士班
103
This paper presents the structure of the application of T type Semi-open parallel slots embedded-type ladder conductor to enhance the thrust of the linear induction motor (LIM).In the analysis, 12 cases combinations are achieved through calculating the type size of the motor, constructing geometric forms with graphic application, performing finite element method software to analyze 4 mobile substructure, and combining with 3 fixed sub-type. Compare the thrust and ripple force of these 12 combinations cases, ladder conductor with back iron increases the thrust, and decreases the effective air-gap, and it reveals the amplification of the thrust, as the simulation result. T type Semi-open parallel slots embedded-type ladder conductor possesses favorable thrust; this simulation data can be used as reference basis when estimating practical linear motor performances.
30
Peng, Shao-Wei, and 彭紹瑋. "Design and thrust analysis of three-phase linear induction motor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/82934562404909131744.
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碩士桃園創新技術學院
機械工程系機械與機電工程碩士班
104
This paper presents the thrust analysis on the structure of the application of semi-open parallel slots moving core ladder shape conductor, as well as the thrust relationship of the conductor with different thickness, based on both distributed and centralized windings. The study applies the data from the finite element analysis on distributed and centralized windings between magnetic flux density and the conductor, the thickness of ladder shape conductor of linear motor as the experimental factor of winding moving core, and finite element analysis to find out thrust behavior analysis of the linear motor. The simulative result of analysis shows that the structure of the application of semi-open parallel slots moving core ladder shape aluminum conductor can effectively improve linear motor thrust, and prove distributed winding, better than centralized one, can promote the thrust significantly. It can also be used as reference basis to develop linear motor.
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Hung, Wei-Chih, and 洪偉智. "Study of Copper Rotor Three-phase Induction Motor for Electric Vehicle Motor Drive." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/amjsfu.
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碩士國立高雄應用科技大學
電機工程系博碩士班
102
The purpose of the research is to design a low voltage motor drive with high current drive for electric vehicles motor driving application. In the articles, we use copper rotor three-phase induction motor for electric vehicle as the power train in electric vehicles. The rotor resistor of copper rotor three-phase induction motor is lower than that of other motor, which cause the high current during the motor starts. Therefore, the rated current of the drive is designed up to 340A, and ultracapacitor should be added into motor drive in order to reduce the input current from the DC bus during the motor starts. In each phase of the inverter circuit, flyback converter is used to supply power into the gate driver circuits that can make the high side gate of the driving circuit more stable when the motor is running. In the motor’s load experimental platform, via testing drive’s output current at different loads and different speeds, the characteristics about the high current and low voltage of the drive are verified. In the last part of the experiment, the output and input power of the drive are recorded from the power analyzer, and the curve graphs of the efficiency and the power factor are drawn. Then, by the way the relationship between the AC output current and the DC input current is generalized, and then the magnitude of the DC input power of the drive is obtained.
32
Huang, Jyun-Wei, and 黃俊瑋. "Balanced operation of a Three-Phase Induction Motor with Steinmetz Connection." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/92022148848259896808.
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碩士雲林科技大學
電機工程系碩士班
97
Because of economic and geographic limitations, many remote areas and islands are not electrified by three-phase electric power. At locations where only single-phase electricity is available, three-phase induction motors with Steinmetz connection are widely used as mechanical power source for agricultural irrigation. This thesis proposes a Steinmetz circuit using passive circuit elements which solves the problem of unbalance operation in the traditional steinmetz circuit using a optimization pure capacitor. This thesis simulates the proposed Steinmetz circuit using the Universal machine module of the EMTP to study the improvement in current and voltage unbalance and pulsating torque. Experiments on a 375W induction motor are carried out to validate the results of simulation.
33
wang, wen-yu, and 王文裕. "Vector Controller Induction Motor Drive with Three Phase Power Factor Correction." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/48300960932507764516.
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碩士國立勤益科技大學
電機工程系
102
A vector-controlled induction motor drive with three phase active front end power factor correction converter is presented. In this system including two parts, which is active power factor correction converter and induction motor inverter-based drive, and both control programs are realized in one single-chip controller. The proposed vector-controlled induction motor drive is based on rotor field orientation controlled skill, that is composed of speed control loop, flux control loop, d-axis stator current control loop, q-axis stator current control loop, voltage decoupled unit, coordinate transform, and sine pulse width modulation, etc. The actor front end power factor correction converter with dual direction power flow, and applying d-q axis current and voltage controller to preserve sine waveform current and closing unit power factor. The simulation scheme is established by toolbox Matlab/Simulink, and all controllers are designed by proportional-integral type. The control algorithms are developed by Renesas micro-controller RX62T to generate PWM signals to the power stage to drive the motor. Simulation and experimental results confirm the effectiveness of the proposed system.
34
Tsou, Min-Tsang, and 鄒名倉. "Implementation of a DSP-based driver for three-phase induction motor." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/58888674623673173544.
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碩士國立臺灣海洋大學
機械與機電工程學系
95
This thesis presents the development of DSP-based driver for three-phase induction motor to improve the structure of the analog driver hardware, the concept of modularization is used to design and develop the driver. It is easy to debug and maintain. The volume and the design complexity are reduced. PWM technique is used to inverter for the purpose of reducing the noise and vibration when the driver is actuated. The experimental results are provided to confirm the performance and effectiveness of the proposed scheme. We can find that the proposed approach applied to the motor driver has the better response than the conventional analog driver. Keyword：DSP , PWM , Motor Driver
35
TSAI, HONG-YIN, and 蔡宏胤. "The Characteristic Simulation and Analysis of Three Phase Submersible Induction Motor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9nrcum.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系博碩士班
104
This paper focuses on analyzing the rotor skew slot effects and optimizing the performance of three phase submersible induction motor by simulation. And this research is conducted by simulating operational characteristics of electromotor with the application of JMAG simulation software and verifying the practical correctness of simulation by measuring the electromotor torque, output power and efficiency with the dynamometer. The simulation of rotor skew slot effects aims at restraining the ripple torque to reduce the motor noise under work. The experiment has conducted by deducing the proper skew angle of rotor and analyzing rotor skew slot effects with the Multi-Slice function of software. According to the simulation results, the differences between coil current waveform distortion factor of rotor slot and electromagnetic torque are found out. In conclusion, the proper rotor skew slot is conductive to restraining ripple torque, further reducing the noises and improving the efficiency of electromotor. In order to optimize the performance of electromotor, this paper has adjusted the internal parameter of electromotor by the application of fuzzy-based Taguchi method to improve the efficiency, restrain the starting current and achieve the optimal design. The actual outcome can serve as the references for academic circles, industrial motor design and relevant researches.
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Lu, Che-Yuan, and 呂哲原. "Implementation of Hybrid Vector Control for Three-phase Induction Motor Drive." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/92cs93.
Full textAbstract:
碩士國立虎尾科技大學
電機工程研究所
101
In the thesis, a kind of hybrid vector control is implemented for three-phase induction motor drive. In order to achieve maximum torque control which based on estimating the flux magnitude and phase by motor parameters for indirect vector control, the hybrid vector control uses the voltage sensor to correct the variation of motor parameters, just like the effect of direct vector control with a flux estimator to measure the flux magnitude and phase. The three-phase induction motor drive consists of two dc power supplies, three power switches and three power diodes. Each of the induction motor windings can be controlled independently by three-switch inverter, which is driven by special current waveform. Therefore, when one of the windings of induction motor is used to detect induced voltage, it corrects variation of motor parameters to enhance robustness of the system. In the control circuit, both VisSim simulation and DSP TMS320F2812 are employed to finish digital control. Finally, some experimental results are presented to verify the feasibility of the hybrid vector control in the motor drive.
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CHEN, CHUN-KAI, and 陳俊凱. "Drive and Control of Three-phase Induction Motor without Shaft Sensor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/55678821315386977490.
Full textAbstract:
碩士國立聯合大學
電機工程學系碩士班
104
The purpose of this thesis is toimplementaset of three-phaseinduction motor drive system,and to develop the speed estimation method andthe five controlmethodswithout shaft sensor based on digital signal processor(DSP).Firstly, the three-phase induction motor mathematical model is constructured.Secondly, the drive system is implemented. Then, the space vector pulse-width-modulation (SVPWM) technology is applied in the three-phaseinduction motor drive systemby using DSP control system. In addition, the estimation method of rotor speed is developed the use of sensing voltages, currentsand zero-cross points to achieve the speed closed-loop control of the three-phaseinduction motor drive system without shaft sensor. Furthermore, the incremental proportional-integral (PI) controller, the fuzzy controller, the fuzzy theory gain-tuning PI controller, the sliding-mode controller, and the fuzzy sliding-mode controller are proposed. Finally, comparisonsof various control performances in the five kinds of controllers viathesimulated and experimental results are demonstrated to verify the effectiveness of the control system.
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Li, Kuo-Pin, and 李國彬. "Implementation of Computer Aided Design Tool for Three-Phase Induction Motor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/76239758416533075462.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
97
With the development of computer software, computer aided design tools have been applied to the design of industrial motors for many years, but the price of professional software is usually too expensive. This thesis utilizes personal computer (PC) as the platform, chooses the Microsoft Windows operating system, and performs the complicated calculations with the grammar of the C++, to obtain the electrical characteristics and mechanical dimensions. Based on the concept of object-oriented programming, Microsoft Visual C++ 2008 Express is employed as the programming tool to develop a low-cost and easy-to-use program for the design of induction motors. Besides, this thesis provides practical design data and illustrates the choice of motor specifications in order to be helpful to designers.
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Li, Hsien-Huan, and 李憲寰. "The xPC Direct Torque Control System for Three Phase Induction Motor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/12944534147976887196.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系碩士班
93
This thesis researches the xPC DTC system which applies to an induction motor servo system. We describe software and hardware of the xPC DTC system, and describe how to combine the xPC-MC240 PCI Card and Inverter. This thesis uses conventional DTC and the new d-q axis PI type DTC, to simulate them with MATLAB/Simulink program. Then, we succeed in proving the feasibility of this xPC system by experiments. The results show that, compared to the conventional DTC, this new d-q axis PI type DTC reduces ripple and has better response.
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Wang, Chien-Dar, and 王建達. "The Real Time Remote Control System of Three Phase Induction Motor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/08753298573342123342.
Full textAbstract:
碩士國立海洋大學
機械與輪機工程學系
89
AC three phase induction motor is widely used in industry. This paper propose a system architecture to integrate remote monitor and control system using graphical base software “XTOP” and PLCs. Users can realize the situation of production lines through the networks. “XTOP” has simple character and easily to use. Operators that do not need lot of training and special skills can use this system to add or change data acquisition units or equipments on production line. This can greatly reduce the cost of training and system modification fee. The functions of the system can prove this system architecture matches all the requirement of production lines.
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Nagornyy, Aleksandr S. "Evaluation of the stray load losses for a three-phase induction motor." Thesis, 2003. http://hdl.handle.net/1957/32058.
Full textAbstract:
The evaluation of the stray-load losses in induction motors is an important part of
the efficiency estimation process. However, stray-load losses have several components
which are difficult to isolate and calculate. Consequently, they are more readily
determined by test. IEEE Standard 112-1996 recommends the testing of electrical
induction motors at a rated mode (nominal frequency and voltage). Thus, the IEEE 112
test does not provide us with information about the motor efficiency and stray load
losses at supply frequencies which are different from the rated value. At the same time,
this information is very important for the correct evaluation of the efficiency of the
motors, controlled by the Adjustable Speed Drives (ASDs).
This work is dedicated to the investigation of the relation between the motor
efficiency, stray-load loss and the supply frequency. The voltages to be applied for the
specific values of the frequency were chosen to keep the value of the relative slip
constant at 100% load torque. After performing the series of load tests, it was found
that the SLL is proportional to the square of the load and the dependency between SLL
and frequency for different load levels is close to linear. The comparison of the
efficiency values obtained by the methods IEEE 112 B and 112 E has shown a good
correlation of the results.Graduation date: 2004
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Hsu, Chia-Wei, and 許家瑋. "Application of Intelligent Motor Control System for Control and Protection of Three-Phase Induction Motor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/56521156678651408559.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
100
Motor control center (MCC) is widely used in the industry. The conventional MCC consists of electrical and mechanical components and apparatus and all connections are in the form of hard wiring. The task of troubleshooting often needs to make measurements with a large number of components and control points, which is labor-intensive with high maintenance cost and time. In recent years, the Intelligent Motor Control Systems (IMCCs) are gaining development and applications. The IMCCs use new intelligent components and network technology and will be able to identify the type of motor fault more quickly. In this thesis, the functions of IMCC motor protection is applied to the diagnosis of motor faults with the detection of imbalances in voltage and current. The conditions under study are carbon deposits on the electromagnetic contactor and open line circuit faults of an induction motor. An experimental platform for the diagnosis of motor faults includes an IMCC, an induction motor, a personal computer equipped with Matlab/Simulink and LabVIEW, a magnetic contactor, and resistors with numerous values resistance. Some function codes, including motor fault simulation, virtual instrumentation, and fault diagnosis, are implemented in the personal computer. Experiment works consist of both the software simulation and hardware emulation of motor faults and practical detections. It is found that the IMCC will assist the maintenance crew in diagnosing the motor faults.
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Hsu, Kuo-Feng, and 徐國峯. "Efficiency Improvement of Three-phase Induction Motors." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/czdh3e.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
106
In response to the upgrade of global energy efficiency standards, the efficiency of low-voltage three-phase squirrel-cage induction motor is mandatorily upgraded to class IE3. Therefore, this thesis proposes to reduce the iron and rotor copper losses by using low-loss silicon steel sheet material and copper-bar rotor to replace silicon steel sheets and cast-aluminum rotor, respectively. Two 6-pole, 250HP, three-phase induction motors are designed and built, and the experimental as well as its counterpart groups are formed for benefit improvement analysis. The empirical formula and silicon iron loss curves are introduced to calculate the range of iron loss reduction. The measured results agree closely with the predicted values, and indicate that the core loss can be effectively improved. As to the reduction of rotor copper loss, copper-bar and its end ring resistance are calculated to assess the proportion that the copper loss of the rotor can be decreased. In addition, finite element method of Flux 2D is used to analyze the static magnetic field of the stator and rotor slots to ensure smooth flux line distribution with flux density lower than the saturation value. The IEEE 112-A, IEEE 112-B and CNS 5421, which are the methods for dynamometer evaluation, measurement of stray-load loss as well as the efficiency test with circle diagram, respectively, are adopted to evaluate the motor designed. The corresponding efficiencies are 95.97%, 95.90% and 96.10%. All are higher than the minimum efficiency of 95.80% required by IE3. Meanwhile, since efficiency improvement needs to take motor starting performance into consideration, real test yields the starting torque of 270.1 kg-m for the motor with copper-rotor bar, which is larger than the rated torque of 183.1 kg-m as required by NEMA standard. Besides, starting current measurement gives 2,108A for the motor with copper-bar rotor, which is smaller than 2,191A as specified by Code G. Both the starting torques and currents obtained from real test for the motors with cast-aluminum rotor as well as copper-bar rotor are further confirmed by the three calculation methods proposed by CNS 5421. In short, the efficiency of the proposed low-voltage three-phase squirrel-cage induction motor is upgraded to class IE3 with its starting torque and starting current comply with international standard.
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Chen, HuiLiang, and 陳輝良. "Control of Three Phase AC Induction Motors." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/61361859156480295489.
Full text
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We-JeLiang and 梁偉杰. "Simulation for Detecting Air-gap Eccentricity in a Three-phase Induction Motor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/67097376952691484039.
Full textAbstract:
碩士國立成功大學
系統及船舶機電工程學系碩博士班
98
Owing to the gradual depletion of oil and a concern for environmental protection, motors have become the drive system of the future instead of the combustion engine. Among various types of motors, induction motors are often used due to their simple structure, fast reaction, and powerful propulsion force. Thus, the safe operation of motor vehicles is a major concern with the trends in the online fault monitor. However, the accuracy of online monitoring is the most difficult task. Based on statistics, the motor failures caused by electric and mechanical parts may occur mainly in stator, bearing and rotor. Among mechanical faults, 80% of relevant troubles may cause the phenomenon of air-gap eccentricity, leading to the power factor decreasing, motor vibrations, power losses and enlargement of the fault area. Particularly, it may result in the rotor and stator sides to chaft each other in a serious situation. If one can detect motor faults in advance, maintenance schedule or parts replacement can be properly arranged to reduce the risk of suddenly shut down in motor operation. This thesis simulates the differences of the characteristics of electric current signals for a three-phase induction motor under normal condition, uneven dispose fault and air-gap eccentric fault using Matlab/Simulink. To verify the feasibility of the models developed in the MATLAB/Simulink environment, the simulated fault signals are compared with the results obtained by other research. Finally, this thesis shows that the air-gap eccentricity degree can rapidly and reliably be diagnosed without using the traditional method to transform the fault signals into the frequency domain by analyzing them with a neural algorithm.
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賴擁成. "Design of Self-Tuning Fuzzy Speed Controller for Three-Phase Induction Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/79235677048677526440.
Full textAbstract:
碩士國立海洋大學
電機工程學系
88
Abstract The main purpose of this thesis to study is the application of fuzzy theory to design the speed controller for three phase induction motors. With the parameters self-tuning mechanism, the parameters of the membership function can be tuned on line and real time for better system performance. Besides, we employ the Adaptive Network-based Fuzzy Inference System(ANFIS) to optimumize the controller parameters. A three phase induction motor speed controller experiment system is setted up and verify the proposed of parameters self-tuning mechanism. The results of simulation and experiment are also showed. Keyword: fuzzy, three phase induction motors, parameters self-tuning mechanism.
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Liu, sheng-Tao, and 劉聖道. "Effect of unbalanced voltage on the performance of three-phase induction motor." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/94299466724173822748.
Full textAbstract:
碩士大同工學院
電機工程學系
84
Unbalanced power system usually leads to many ill effects on three-phase induction motor in efficiency, power factor and temperature rise. This thesisinvestigates how voltage unbalance affects three-phase induction motor by field test and computer simulation. Referrng to the weakness of NEMA deratingcurve, this thesis also finds out the differences of motor characteristics including motor efficiency, losses, power factor and temperature rise ofdifferent positive-sequence voltages under the same VUF. It is hoped thatthe results will contribute to power utilities for drawing up related regulations.
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Thirugnanasambandamoorthy, Madusudanan. "A unified modulation scheme for three-phase inverter-fed induction motor drives /." 2001.
Find full text
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Liang, Jin-Yuh, and 梁金煜. "Design of PID Chip Direct Torque Control for Three Phase Induction Motor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/e9z9ug.
Full textAbstract:
碩士國立臺北科技大學
電資碩士班
97
In this thesis, a Direct Torque Control (DTC) technique is used to control a three-phase induction motor , where the DTC is implemented with the hardware descript language. The principle of the DTC system is to measure the feedback three-phase current and the rotor speed after the three-phase voltage is set. Based on theses measured data, the synthesized magnetic flux, location of the synthesized magnetic flux, and the torque of the motor are calculated. The suitable output signal could then be selected through the usage of voltage vector switch table to change the trigger switch states of the power transistor in the inverter to obtain a stable response of motor speed. further more, this study uses the proportion-integration-derivative to. Besides, this study also changes the torque control comparator from coordinates 1 and 3 to a single coordinate. The reason is that it can simplify the control architecture and can reduce the chip area and power consumption.
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Pan, Chien-Lun, and 潘健倫. "Development of Three-Phase Induction Motor Drives with Low DC-Link Capacitance." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/5zz9b9.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
94
This thesis focuses on the design and implementation of a speed control system for three-phase induction motors. The full-bridge diode rectifier is used to convert the utility to dc source. The control of pulse-width modulation with compensation is completed by the feedback of dc-link voltage. It thus can not only improve the current harmonics of inverter but also reduce dc-link capacitance and volume. Besides, the speed control range of three-phase induction motor driver is investigated by detecting the minimum value of dc-link voltage to avoid torque and speed fluctuation when utility voltage varies. According to the feedback of dc-link voltage, the compensation of pulse-width modulation and field-weakening control are conducted to make the motor operate steadily in constant torque and constant horse-power regions. In this thesis, closed-loop speed control of a three-phase induction motor with dc-link voltage compensation are given using constant flux and indirect rotor flux oriented controls. A high-performance, low-cost digital signal processor, TMS320LF2407A, is used as the control core. The control of motor and inverter is accomplished by software for cost reduction. A prototype of 400W three-phase induction motor with speed control system is developed. The input is three-phase, 60Hz and 110V.The dc-link capacitor is 22uF. The experimental data show that the motor runs smoothly as expected.