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1
Esuri, Abdulhamid H. "Two-phase inverter/induction motor drive." Thesis, Loughborough University, 1991. https://dspace.lboro.ac.uk/2134/33109.
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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.
2
Wong, Kwan Butt Albert. "Aspects of single-phase motor performance." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390215.
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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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4
Zheng, Libo. "Analysis and control of five-phase induction motor drives." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501695.
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Analysis and control of five-phase induction motor drives are investigated in this thesis. A vector model for five-phase induction motors is derived. Two distinct aspects related to multi-phase induction motor modelling are revealed and determination of the equivalent circuit parameters is explained from theoretical and experimental viewpoints. Modulation techniques for the five-phase voltage source inverter are developed, with both separate and simultaneous space excitation included. The analysis of five-phase induction motor drives is verified using a practical test rig. Indirect vector control applied to the first and third space harmonics, with separate excitation and simultaneous excitation, are experimentally assessed.
5
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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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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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.
10
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.
11
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.
13
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.
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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.
14
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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Buyukbas, Afsin. "Calculation Of Core Losses Of A Six Phase Induction Motor With Third Harmonic Current Injection." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219419/index.pdf.
Full textAbstract:
ABSTRACT CALCULATION OF CORE LOSSES OF A 6-PHASE INDUCTION MOTOR WITH 3RD HARMONIC CURRENT INJECTION BÜYÜ
KBAS, AfSin M.S., Department of Electrical and Electronics Engineering Supervisor: Prof. Dr. H. Bü
lent ERTAN January 2004, 106 pages The advantages of using a six-phase induction motor for industrial drives, over the conventional three-phase drive can be summarized as improved reliability, reduction on the power ratings for the static converters and harmonic reduction. A technique of injecting third harmonic zero sequence current components in the phase currents to improve the machine torque density was presented recently by another research study. However, to meaninigfully evaluate the performnce of such machines and/or to be able to make good designs
it is necessary to obtain an accurate mathematical model for the loss calculation. The calculation of high frequency loss in this context presents a very difficult problem. In this thesis a modified version of a loss calculation model, which was developed in another MS thesis will be applied to a six-phase induction motor with third harmonic current injection.
16
Billis, Gerald. "The design and evaluation of a microprocessor-controlled triac cycloconverter two-phase induction motor drive." Thesis, Hong Kong : University of Hong Kong, 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1285072X.
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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.
18
Najjar, Mohamad. "Machine analysis : being a study of the application of the finite element method for solving the two-dimensional field of the single-phase shaded-pole induction motor." Thesis, University of Strathclyde, 1985. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21461.
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This thesis contains eight chapters, dealing with machine analysis and representation. A definition and a brief survey of previous investigation devoted to shaded-pole motors and the application of finite element method for solving the two-dimensional electromagnetic field is given in Chapter 1. An outline of the present investigation is also given. In Chapter 2, the experimental requirements and details of the equipment are given. This includes the techniques of recording the transient torque patterns and the method of measuring the complete torque-speed characteristics. The experimental methods for parameters determination are also mentioned. The finite element method is outlined in Chapter 3. This chapter deals also with the assumptions made, the formulation of the non-linear energy function, the solution of Poisson's equation and an example of a simple shape contianing 16 elements for illustrating the method. In Chapter 4, the computer program for the finite element is outlined. The iteration process and the numerical representation of the magnetization curve are mentioned. Application of the finite element method to the shaded-pole motor is also given. Calculation of parameters by finite element technique is given in Chapter 5. Self inductance is calculated using the concept of stored energy and the results of self and mutual inductances are tabulated. Basic performance equations of an electrical machine are derived in Chapter 6. Solution of the basic performance equations, by a step-by-step numerical method, is also given. In Chapter 7, the steady state performance equations are established in terms of harmonic currents and inductance coefficients. The flux linkages are evaluated by the approximated functions of mutual inductances. The electromagnetic torque is calculated from the stored energy in the magentic field. General conclusions and suggestion for further work are mentioned in Chapter 8.
19
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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Jian, Yun-huah Chang, and 張簡韻桓. "Study on Two-Phase Induction Motor Drives." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/u39ddk.
Full textAbstract:
碩士國立虎尾科技大學
航空與電子科技研究所
101
The electrical fan, based on the induction motor, operate with very low efficiency on the high slip, when the speed control is used by the series inductors or capacitors. In order to improve the efficiency of the induction motor, inverter benefit with Pulse Width Modulation (PWM) methods included the unipolar PWM and the bipolar PWM is discussed. The unipolar method shows the better harmonics performance for the improvement of the noise reduction. The inverter with PWM method also has the advantage of efficiency operation then the induction motor operated on the tradition method. The new type two-phase induction motor speed control with four legs inverter structure compare with the conventional method by using the two-phase theory. The new method has lower switch losses and the better harmonics injection to the motor current. The noise, a kind of electrical noise caused by the current harmonics, is reduced effetely by using the new method. In order to evaluate the performance, include the efficiency, harmonics and noise, the three kinds of tests are included. They are the high voltage (110V) and low voltage (24V) ceiling fan and the new method. The results shows that the PWM inverter with two phase theory has the better efficiency, when that compared with the traditional ceiling fan in the single phase control. The new methods with four legs inverter structure obtain the best efficiency, the power consumptions are reduced for 11W to 6W.
21
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.
Full textAbstract:
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.
22
XIE, MING-KUN, and 謝明坤. "On the control of single-phase induction motor." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/44025559762042821631.
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Rakesh, P. R. "PWM Techniques for Split-Phase Induction Motor Drive." Thesis, 2014. http://hdl.handle.net/2005/3136.
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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.
24
Chen, Chang-Sung, and 陳蒼松. "Computer Aided Design of Single-Phase Induction Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/65600609417802672948.
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碩士國立海洋大學
電機工程學系
86
The computer has been applied to the design of electric apparatus for many years.In Taiwan,most of the computeraided design programs applied in the area of low-power electric machines such as single-phase induction motorare still working on Dos system.The main purpose of thisthesis is to develop a program that based on the personalcomputer(PC) under the environment of the populer operatingsystem,Microsoft Window95. This program,named Single-PhaseInduction Motor Design(SPIMD),is implemented by using theprogramming language of Visual Basic( Professional Edition).SPIMD performs data automatic processing ability,especiallyin wired code,table,curves,and iteration procedure.Besidesthe preceding function,SPIMD offer various other services,for example copious empirical data of single- phase inductionmotor design.The program package affords to improve the designand analysis efficiency is expected.
25
Huang, Wun-Liang, and 黃文良. "Analysis of Adjustable-Speed Single-Phase Induction Motor Using Phase-Controller." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/39188097808808891603.
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碩士崑山科技大學
電子工程研究所
100
Small single-phase induction motor(SIPM) has been widely used in household appliances such as electric fans, air-conditioning units. The most common used speed control method is with mechanical switch combined with coil connections such as external transform or internal windings connection. This is based on cost considerations. Further control method uses phase control or variable voltage variable frequency (VVVF) control, respectively. The main issue of this paper is to explore the power components and efficiency of the phase-control speed process.
26
Lettenmaier, Terrance Michael. "Single phase induction motor with an electronically controlled capacitor." 1986. http://catalog.hathitrust.org/api/volumes/oclc/15020767.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1986.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 107).
27
Myers, Thornley O. A. O. "A phase-domain induction motor model for transient studies." Thesis, 1995. http://hdl.handle.net/2429/3667.
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The research programme presented in this thesis terminates the first phase in the
development of a new and accurate model for transient analysis of induction motors in the
phase domain. Modelling the induction machine variables in the phase domain required a
new model which when tested in similar conditions with existing models would give
comparable results in both transient and steady-state studies. This new model has been
developed, and essentially it differs from traditional models in that it works directly with
the machine variables such as currents and voltages directly in the phase domain instead of
the dqO coordinates. This required the solution of a series of first order differential
equations with time-varying coefficients. The solution method is based on the
discretization of the differential equations with the use of the trapezoidal rule of
integration. The new model has been used to develop a computer program for transient
and steady-state analysis of induction motors.
The new phase domain transient model (PDTM) requires a number of circuit
parameters of the induction motor that are not normally supplied by the manufacturer.
Consequently, modifications were performed on a computer program that calculates the
parameters of the standard 60-Hz equivalent circuit from starting and steady-state
characteristics of the motor to obtain the circuit parameters of the PDTM.
The results from the PDTM compare favourably tested with those obtained from the
electromagnetic transient program (EMTP) which uses conventional dqO coordinates to
model the induction motor.
28
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.
Full textAbstract:
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.
29
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.
30
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.
31
HSU, CHIA-TUNG, and 許嘉桐. "Development of two-phase induction motor drive for ceiling fans." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93059551325918354757.
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碩士國立臺灣科技大學
電機工程系
101
This paper focuses on developing a digitalized drive system for ceiling fans. The control of a two-phase induction motor can be realized by using two-phase DC-AC power converter which help to increase the overall efficiency of the system. As for the hardware setup, P-MOSFETs and N-MOSFETs combined with gate drivers are used to implement the power circuit of the power inverter so that no isolated power is needed to supply upper arms of traditional converter. The control strategies are as follows: Firstly, the voltage utilization rate can be increased by using unipolar SPWM control. Secondly, the electromagnetic torque can be increased while the torque ripple can be reduced by adopting the compensation of unbalanced voltages and adjusting the symmetrical proportional constant, kb. The noises can be reduced accordingly. Lastly, the operating efficiency can be increased by using the control strategy of compensation of peak voltages. A low-cost digital signal processing device, dsPIC30F6015, is adopted to complete the two-phase induction motor system in this study. The total harmonic distortion of the current is 3.80% and 4.12% by using unipolar and bipolar SWPM control, respectively. Moreover, the control strategy of the compensation of unbalanced two-phase voltages is able to regulate the two-phase unbalanced output current so that same amount of current can be obtained. The total harmonic distortion of the current is 1.52% and 2.54% with and without compensation, respectively. In addition, identical two-phase currents of the induction motor will result in a higher rotational speed. Finally, the efficiency control of the induction motor uses the control strategy of the compensation of peak voltages. At the highest rotational speed of 140 rpm(wind speed 0.8m/s), the output power with peak voltage compensation is 22.20W which is lower than the output power of 23.56W without peak voltage compensation.
32
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.
Full textAbstract:
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.
33
Wang, Shih-Wei, and 王士維. "Study of Single Phase Induction Motor with Maximum Starting Torque." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/62162083460450016379.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
94
For low speed application, the gear box is used to reduce the speed of the single phase induction motor, but it will produce noise and reduce reliability. Therefore, the variable-frequency method to diminish speed was developed in field application. The main advantages of this method can reduce the noise of the gear box and increase the reliability. However the single phase induction motor can not maintain original starting torque under variable-frequency. In this thesis, the optimum capacitance was evaluated based on the double revolving-field theory ( DRFT ).And, up-voltage that does not influence the current specification of the machine are used to promote starting torque at low frequency. Simulation results indicate that the starting torque of variable- frequency method is higher than that of nominal frequency. The operation requirement of low speed and high starting torque is also conformed.
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Law, Joseph Daniel. "A single phase induction motor voltage controller with improved performance." 1985. http://catalog.hathitrust.org/api/volumes/oclc/12532391.html.
Full textAbstract:
Thesis (M.S.)--University of Wisconsin--Madison, 1985.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 88).
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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.
Full textAbstract:
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.
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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.
Full textAbstract:
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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楊宗銘. "= Design and implementation of two-phase induction motor inverter drives." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/68971023644888480686.
Full text
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Chis, Lucian. "Testing and modeling of the single-phase Written-Pole Motor." Thesis, 1998. http://hdl.handle.net/1957/33457.
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A relatively new development in the electric machines field has been the written-pole technology, of which the latest product is the large single-phase electric motor, the single phase Written-Pole Motor (WPM). The WPM is a synchronous, permanent-magnet single-phase motor having a weak rotor cage for start-up which in addition exhibits significant hysteresis effects at speeds below or above true synchronism. The electrical configuration of the WPM places it in the capacitor-start capacitor-run category of single-phase motors, due to the large size and need for an approximation of a round rather than elliptic rotating magnetic field.
This thesis presents the results of the research conducted by the author in the Motor Systems Resource Facility (MSRF) of the Electrical and Computer Engineering Department at Oregon State University. The thesis is structured into two main parts: Testing and Modeling.
The tests conducted on the WPM were trying to independently verify manufacturer's claims with regards to efficiency, power factor, robustness, power-outage ride-through and furthermore to study the behaviour of the machine during voltage sags, overvoltages and undervoltages. Tests were conducting in order to develop a
mathematical model from which the performance of the machine can be predicted.
The modeling efforts were concentrated in the development of a comprehensive model which would include all three major aspects of the WPM, and the performance of the resulting model was compared with the sampled data.Graduation date: 1999
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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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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.
Full textAbstract:
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.
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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.
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Hxiao, Yuting, and 蕭煜庭. "Dynamic Braking of a Voltage Supplied for Single Phase Induction Motor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/48366843744876709401.
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碩士大葉大學
工學院碩士在職專班
99
ABSTRACT DC injection braking systems provide a simple, rapid and reliable solution as they are incorporated within the control function and utilize the existing motor drive. The main purpose of this paper is to design a DC injection braking system for a single –phase induction motor drive. First, the single phase induction was designed through finite element method. Simulation results, including flux lines, flux density and magnetic field distribution. The designed DC injection braking modules utilize Programmable logic controller, transformer, rectifier and magnetic contacts to switch the injected DC current into the motor windings. DC injection braking can provide the motor braking force during stop when AC power is removed from the motor. DC magnetic field introduced into the stator will create a powerful braking force on the spinning rotor. This DC injection current may be increased to provide more braking torque from the single induction motor. Experimental results show that the DC injection is an effective braking method for the single-phase induction motor can also be applicable in the case of the three -phase induction motor. Keywords: dc injection braking, finite element method, single-phase induction motor, dynamic braking
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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.
Full textAbstract:
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
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Ou, Wu-Chau, and 歐武超. "The Run Capacitor in Single-Phase Induction Motor to Efficiency Influence." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/71661060647431760708.
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碩士和春技術學院
電機工程研究所
96
This thesis is mainly for the analysis of permanent split-capacitor motor of single-phase induction motor (SPIM) to Efficiency Influence. This thesis is based on the test of alternating current 220V, 150 watt, 2 pole's motor, adopted with different capacitance value of the different running capacity, and comparative analyze the biggest torque magnitude of current and the efficiency value. the result is, the capacitance value and the current value assume the positive correlation, presents the non- positive correlation with the efficiency, the torque. So the running capacitor of permanent split-capacitor motor changes capacitance value, and the current also. But the efficiency is a non- positive correlation along with the capacitance value. Accordingly, selecting the proper running capacitor value and capacitance value of run capacity is a very important issue for single-phase induction motor’s efficiency. Hope through the study, we can have further understanding toward the effects of running capacitor capacitance value brings to single-phase induction motor’s performance.
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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.
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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.