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1
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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Blasco, Giménez Ramón. "High performance sensorless vector control of induction motor drives." Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/13038/.
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The aim of this research project was to develop a vector controlled induction motor drive operating without a speed or position sensor but having a dynamic performance comparable to a sensored vector drive. The methodology was to detect the motor speed from the machine rotor slot harmonics using digital signal processing and to use this signal to tune a speed estimator and thus reduce or eliminate the estimator’s sensitivity to parameter variations. Derivation of a speed signal from the rotor slot harmonics using a Discrete Fourier Transform-based algorithm has yielded highly accurate and robust speed signals above machine frequencies of about 2 Hz and independent of machine loads. The detection, which has been carried out using an Intel i860 processor in parallel with the main vector controller, has been found to give predictable and consistent results duing speed transient conditions. The speed signal obtained from the rotor slot harmonics has been used to tune a Model Reference Adaptive speed and flux observer, with the resulting sensorless drive operating to steady state speed accuracies down to 0.02 rpm above 2 Hz (i.e. 60 rpm for the 4 pole machine). A significant aspect of the research has been the mathematical derivation of the speed bandwidth limitations for both sensored and sensorless drives, thus allowing for quantitative comparison of their dynamic performance. It has been found that the speed bandwidth limitation for sensorless drives depends on the accuracy to which the machine parameters are known and that for maximum dynamic performance it is necessary to tune the flux and speed estimator against variations in stator resistance in addition to the tuning mechanism deriving from the DFT speed detector. New dynamic stator resistance tuning algorithms have been implemented. The resulting sensorless drive has been found to have a speed bandwidth equivalent to sensored drives fitted with medium resolution encoders (i.e. about 500 ppr), and a zero speed accuracy of ± 8 rpm under speed control. These specifications are superior to any reported in the research literature.
3
Davidson, Innocent Ewean Agbongiague. "Performance analysis for a shaded-pole linear induction motor." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/21326.
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Bibliography: pages 129-148.The induction motor remains the prime mover of present day industry with it's associated components in drive applications. In many such applications, fractional horse-power motors find ready use in small mechanisms where three-phase power supply is not available. In Southern Africa, these motors can be used is rural areas with simple reticulation systems, hence the renewed interest in the development of these low-power electrical motors, especially specialised models such as linear versions of such motors for special applications. This research is in the area of single-phase LIMs. The objective has been to model the shaded-pole LIM, in an attempt to enhance it's performance through improved design methods. This was carried out using an integrated analysis approach, involving circuital and field theory in the analysis of the practical motor, and computer simulation of it's equivalent model using the finite element method. Linear counterparts are possible for all the various forms of rotating electrical machines. All cylindrical machines can be 'cut' along a radial plane and 'unrolled' [32]. LIMs convert electrical energy directly into mechanical energy of translatory motion. Some advantages of linear version of induction motors are: they are gearless and often require minimal material thus minimising cost. While their scope of application are somewhat limited when compared to rotary versions, they do however give excellent performance in special situations where translator motion is required. However, the output power-to-mass and output power-to-volume of active materials ratio is reduced compared to rotary induction motors[45]. These disadvantages are caused by the large air-gap and the open magnetic circuit, which produces parasitical effects.
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Müller, Markus Anton. "Improved calculation methods for particular aspects of induction motor performance." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239100.
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Brown, Christopher P. (Christopher Perry). "Design for manufacturability of a high-performance induction motor rotor." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38170.
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Karacan, Cuneyt. "Comparison Of Performance Of Switched Reluctance Motors, Induction Motors And Permanent Magnet Dc Motors." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604925/index.pdf.
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Since most of the electrical energy is consumed by the electrical motors, it is necessary to use the electrical energy as efficient as possible.
Throughout this study four different types of motors (induction motor, permanent magnet radial flux DC motor, permanent magnet axial flux DC motor, switched reluctance motor) are considered and compared based on their torque per unit volume and speed performance comparison. Torque per unit volume equations are obtained for each of the motor, related to quantities such as magnetic flux density and electric loading and the speed performances are compared by using a washing machine application, which has a wide speed range.
As a result of this study torque per unit volume and speed performance of each of these four types of motors are obtained and motors of different types are evaluated due to their torque per motor volume, torque per ampere, efficiency and etc. over a wide speed range to have an idea about the applications of these motors.
7
Khumalo, Siboniso T. "Induction motor variable speed drive performance and impact on energy savings." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/8751.
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Bibliography: p. 132-134.ESKOM, together with Municipalities distribute power at a line-to-line voltage of 400+/-10%. Hence in theory, the user ends up with a voltage of 340 to 440. In urban areas 2% voltage unbalance is considered acceptable, while 3% voltage unbalance is considered acceptable for rural areas. The combined effects of under or overvoltages coupled with "acceptable maximum" voltage unbalance is not understood or documented. This project is a comprehensive study of the effects of voltage unbalance in combination with under or overvoltages on induction machines (1M) variable speed drives. In addition the performance with PWM inverters connected to 1M via long cables is also studied. The project starts by an evaluation of previous work on the subject and related topics. Relevant conclusions are made based on the literature review in Chapter One. The second step of the project was to develop two test beds in the UCT Machine's Laboratory. The test beds are for performance testing of low (up to 15kW) and medium (up to 75kW) power 1M and their VSDs. The test bed losses are determined at 4 different operating points and documented. Several tests such as the blocked rotor and no load tests were undertaken to determine the machine parameters. A PSpice simulation model was developed and tested for the low voltage test bed. The test results compared well to simulation predictions. Furthermore, tests under unbalanced and overvoltage conditions were performed and the results verified with simulations. This proves that the developed PSpice model can reliably simulate the actual test bed for both balanced and unbalanced conditions. Moreover, it can be easily applied to model different size machines and drives. The information required includes: the motor parameters, drive dc-link parameters, modulation ratio (ma) and the switching frequency. The impact of voltage unbalance in drives with long cables between the inverter and motor is examined. A 36m long, 4-core, PVC insulated cable is used on the low voltage test bed for a case study. The model used for the cable is a lumped parameter model. The 1M model is also taken from the literature to include a high frequency branch, to model the reflected voltage wave phenomenon. A basic analysis of energy savings in pumps and fans load associated with the application of variable speed drives is also done. Boiler feed-pumps from Tutuka power station are used as a case study that may be replicated for other applications in utilities or industry. The developed Excel Spreadsheet program to project the value of savings and determine the payback period is compared to an ABB program. The two results agree within an acceptable range. Therefore, the knowledge of the pumping system specifications and the cost of energy in kWh with the Energy Savings Program would enable one to project energy savings.
8
Bal, Gungor. "Performance analysis of field-orientation controlled induction motor with parameter adaptation." Thesis, University of Strathclyde, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392468.
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Thongam, Jogendra Singh. "Commande de haute performance sans capteur d'une machine asynchrone = High performance sensorless induction motor drive." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.
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Norman, Rosemary Anne. "High-performance current regulation for voltage-source-inverter-fed induction motor drives." Thesis, University of Bradford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514187.
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Amin, I. A. M. "Some of the effects of the permeability distribution on induction motor performance." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371839.
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Shaukat, Usman. "Performance Analysis of Unskewed Asymmetrical Rotor for LV Induction Motors." Thesis, KTH, Elektrisk energiomvandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-109726.
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This master thesis presents a comparative analysis of the starting performance and losses at rated operation for a 15 kW, 4-pole industrial induction motor, mounted with standard skewed, unskewed and unskewed asymmetrical die-cast aluminium rotors through measurements and simulations. It is a well-known fact that rotor skewing suppresses the synchronous torques at low speeds and also reduces the audible noise of the machine. However, the casting process results in a low resistive path between the rotor bars and the iron laminations, for skewed rotors, this promotes the flow of inter-bar currents. These currents, flowing between the rotorbars, increase the harmonic torques during a start and create additional losses at rated operation. For standard unskewed rotors, these losses are ideally zero, but these rotors may produce high audible noise. Studies have shown that rotors with asymmetrical rotor slot pitch can reduce the audible noise level in unskewed machines. By removing the skew, the inter-bar current losses are suppressed to a negligible level; ultimately increased machine efficiency is obtained. In this work the electrical performance is verified through measurements on the built prototypes. Direct-on-line starts and rated performance for motors with different rotor slot arrangements is simulated using 2D FEM tool FCSmek. The three prototypes are tested in the laboratory according to IEC 60034-2-1 standard and the simulation results are in good agreement with the measured results. An additional test for the measurement of high frequency delta connected stator winding currents for each prototype machine is also performed, in order to study the losses induced in the stator winding. Results have shown that by introducing the proposed asymmetry in the rotor slots, the synchronous torques at low speeds are suppressed effectively, thus, improving the starting performance of the asymmetrical rotor compared to the standard unskewed rotor. Additionally, a higher pull-out torque is obtained for the unskewed rotor motor compared to the standard skewed rotor motor. However, the losses were more or less re-distributed in the unskewed rotor motor, resulting in similar efficiency as the standard skewed rotor motor. One important observation is that; to capture the inter-bar current losses which are estimated to be 5.5% of the total losses, requires more accurate methods of measurements than the existing. And sufficient repeatability must be achieved; alternatively one should rely on statistical data obtained from measurements on several number of motors.
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Boukas, Theocharis K. "Exact feedback linearization with state derivative feedback for high-performance field-oriented induction motor speed/position control." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/14890.
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Suciu, Constantin. "Switch mode emulation of large value capacitors in the rotor circuit to improve the induction motor performance." Thesis, Nottingham Trent University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314331.
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Pitis, Constantin Danut. "Novel method of improving squirrel cage induction motor performance by using mixed conductivity fabricated rotors (MCFR) / Constantin Danut Pitis." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1466.
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The ideal squirrel cage motor should have a varying rotor resistance; large at standstill, and decreasing as the speed rises. Overseas - designed high impedance rotors try to fulfil these conditions - mostly used are double cage rotors and die cast aluminium rotors. However, in the South African coal-mining industry these rotors recorded high rate failures with heavy financial losses. As a result, the need for an alternative rotor type that was able to comply with basic conditions ignored before appeared on the market: • Higher reliability with extended life expectancy • Lower total ownership costs • Easy re-manufacturing with components available on the market • Specific performance stability at competitive price. Over the years, only two principles were tacitly accepted in designing squirrel cage rotors: 1. For a single cage rotor, in a circumferential direction around the rotor the squirrel cage bars are placed in the same cylindrical shell, with the same shape and same conductivity. 2. For a double cage rotor, the same rule as above applies; however, in the radial direction, the bars have different shapes and typically different conductivities.
The Invention is based on a new principle, i.e. "in a circumferential direction around the squirrel cage rotor, squirrel cage bars may have different conductivities and same shapes, or different conductivities and different shapes”.
Mixed Conductivity Fabricated Rotors (MCFR) are designed and manufactured based on this
new principle, and are able to withstand the harsh South African mining conditions.
Since patented, the invention has been materialised in a set of special rotors powering
continuous miners of a reputable coal-mining house, which was spending about R5 million
annually on replacing specific imported die cast aluminium rotors only.
Fully complying with the above-mentioned basic conditions, the patent offers a large variety of technical and economical advantages, increasing mining processes efficiency beyond
expectations.
The thesis describes the MCFR's design adaptability by altering the rotor design to meet the demands of a specific engineering application as a base line of drives design.
The patent is part of the new South African trend of increasing processes efficiency. It offers large possibilities of designing dedicated motors with a positive impact on the South African economy. Some socio-economical advantages are worthy of considerable study: • Being locally manufactured, the MCFR may reduce the country's economical dependence. • Requiring no special expertise, the MCFR can be produced in any quantity and size without excessive investment. • The MCFR offers an alternative option (product interchangeability) on the market as well as sound competition (with export potential). • The patent ensures business sustainability conditions which diffuse financial constraints on motor manufacturers and end-users during the re-capitalisation process (very loaded in South African economic and industrial environment).Thesis (Ph.D. (Electrical Engineering))--North-West University, Potchefstroom Campus, 2007.
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Roeber, Jochen Erich. "Influence of higher time harmonics on the electrical and mechanical performance of an inverter-fed squirrel cage induction motor." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/19507.
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Due to the ruggedness, reliability and low maintenance required, small inverter-fed induction motors (1.5 kW to 25 kW) have earned a reputation and are utilized more and more frequently in industry for variable speed applications. The applied voltage and current waveforms are generally quite non-sinusoidal and polluted with higher time harmonic components. The higher time harmonics affect the electrical and mechanical performance significantly, and adverse effects are investigated. Literature on the effect of higher time harmonics is reviewed. Recommendations referring to various aspects under non-sinusoidal excitation are made when installing inverter-fed induction motors. Different inverter supplies (6-Pulse Square Wave voltage source inverter (VSI), PWM VSI and sinusoidal excitation) are used with a small 3-Phase, 3-kW squirrel cage induction motor, configured under synchronous characteristic Vᵣ/50 and subsynchronous characteristic Vᵣ/87. The respective voltage and current frequency spectrums of the excitation source are analyzed and the harmonic content determined. Performance executed under identical operating respectively and results are compared with pure sinusoidal (fundamental) excitation. tests are conditions respect to To determine the electrical performance the efficiency, power factor, temperature rise of the stator and induced shaft voltages were analyzed. The mechanical performance under inverter operation was analyzed by measuring the torque, torque pulsations, critical speeds and resonance frequencies of frame vibrations and torque oscillations as well as vibrations in x-, y-, and z-direction of the inverter-fed induction machine. Consequences of time harmonics on the induction motor and system are discussed. Conclusions on the effect of time harmonics and performance of different inverter types compared to sinusoidal excitation are drawn and are theoretically summarized and justified.
Summary in English and German. Bibliography: pages 148-154.
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Neuroth, Matthias. "Design, implementation and performance of conventional and intelligent control schemes and speed estimators for variable speed induction motor drives." Thesis, University of Aberdeen, 1999. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU177656.
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This thesis discusses the implementation and performance of various conventional and artificial-intelligence-based control and estimation techniques for variable speed induction motor drives. The drive types considered are scalar drives, and high-performance vector and direct torque controlled drives. In the first part, various conventional control design techniques are developed and applied to conventionally controlled drives. The performance of these drives is compared to that of fuzzy logic controlled drives, for which a specific design method is developed using universal fuzzy logic controllers. The developed methods are studied using simulations and experimental results. Implementation issues are presented in detail. In the second part, the design and implementation of conventional and artificial-intelligence-based speed estimators for use in scalar, vector and direct torque controlled drives are discussed. The conventional estimators considered comprise both a mathematical-model-based speed estimator and a model-reference-adaptive-system-based speed estimator. The artificial-intelligence-based estimators considered use artificial neural networks which are trained on data collected in simulations. The performance of both types of estimator, in the entire operating range of the drive, is discussed extensively.
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Zhang, Zaining. "Sensorless vector control for induction motors." Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340849.
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Izguden, Mustafa. "Design Software Development For Induction Motors." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613229/index.pdf.
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The purpose of this thesis has been to convert two softwares called TPCAD (Three Phase Induction Machine Computer Aided Desing) and SPCAD (Single Phase Induction Machine Computer Aided Design) developed earlier for the design and analysis of three and single phase induction machines to meet the needs of motor manufacturing industry so that they can be run in windows environment. Furthermore, it was aimed to include features such as double cage motor analysis and design, to provide a facility designed motor lamination can be drawn for the user to see and facilitate sharing the designed lamination with other professional programs such as finite element analysis or thermal analysis etc.
As a result of this study, a user friendly design tool facilitating the design process of induction motors has been upgraded by using C++ Microsoft Visual Studio .Net programming language. TPCAD and SPCAD are tested with different commercial motors. The results show that the full load performance calculations are within the range of 5% error for both programs. However, starting performance calculation errors are within 10% for TPCAD, and 8% for SPCAD.
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Suchanek, Richard Donald III. "Breakdown Voltage Performances of Aluminum and Copper Conductor Wire Under Compression Stresses." TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1606.
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In the global, competitive market of energy transformation, increased operational expenses and depletion of raw materials have resulted in companies pursuing alternate materials to reduce consumer costs. In electrical applications, energy is transformed using materials with high electrical conductive properties. The conductive material used to transmit a signal is called conductor wire and is comprised of any material that has the ability to move charged particles from one point to another without propagation or delay. The conductor wire in many applications is encapsulated in epoxy resin called enamel. The enamel is the insulation system that provides necessary dielectric clearances to prevent voltage leakage. The most common form of energy transformation is the electric motor. Both copper and aluminum conductor wire are commonly used in electric motors, but copper is preferred due to thermal and electrical properties. However, there is a significant economic incentive to convert to aluminum conductor wire. Limited white papers are available comparing the performances of the two materials; the research is limited to physical and electrical performances of the raw material and does not take into considering the insulation. The conductor wire, which includes the insulation, is susceptible to damage during the manufacturing process and is an inherent risk if not fully understood. During the blocking process, the conductor wire is pushed and compressed into lamination slots. This process changes the conductor wire outer diameter to accommodate void spaces within the lamination slots. The percentage of slot area occupied by the conductor wire is known as slot fill. The higher the slot fill, the more wire occupying the available space. The higher the slot fill, the more force required to fill the slots. High slot fill motor designs provide a performance advantage with little associated cost. The more wire pressed into the slot, the higher the potential efficiency gains. However, high slot fill motors are more susceptible to damage.
The study is designed to evaluate and measure the durability of aluminum and copper conductor wire under simulated compression stresses. Utilizing this information, electric motor manufacturers can push current design limits without affecting conductor wire quality and reliability.
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Hu, Zheng [Verfasser]. "Optimization-based robust control for high-performance torque vectoring in electric vehicles operated by induction traction motors / Zheng Hu." Aachen : Shaker, 2017. http://d-nb.info/1138178713/34.
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Hu, Zheng Verfasser], Kay [Akademischer Betreuer] [Hameyer, and Axel [Akademischer Betreuer] Mertens. "Optimization-based robust control for high-performance torque vectoring in electric vehicles operated by induction traction motors / Zheng Hu ; Kay Hameyer, Axel Mertens." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162498242/34.
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Hu, Zheng [Verfasser], Kay [Akademischer Betreuer] Hameyer, and Axel [Akademischer Betreuer] Mertens. "Optimization-based robust control for high-performance torque vectoring in electric vehicles operated by induction traction motors / Zheng Hu ; Kay Hameyer, Axel Mertens." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://nbn-resolving.de/urn:nbn:de:101:1-2018071006521376576062.
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Dogantimur, Erkan, and Daniel Johnsson. "Analysis of Accuracy for Engine and Gearbox Sensors." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388346.
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This thesis provides a standardized method to measure accuracy for engine and gearbox sensors. Accuracy is defined by ISO 5725, which states that trueness and precision need to be known to provide a metric for accuracy. However, obtaining and processing the data required for this is not straight forward. In this thesis, a method is presented that consists of two main parts: data acquisition and data analysis. The data acquisition part shows how to connect all of the equipment used and how to sample and store all the raw data from the sensors. The data analysis part shows how to process that raw data into statistical data, such as trueness, repeatability and reproducibility for the sensors. Once repeatability and reproducibility are known, the total precision can be determined. Accuracy can then be obtained by using information from trueness and precision. Besides, this thesis shows that measurement error can be separated into error caused by the sensors and error caused by the measurand. This is useful information, because it can be used to assess which type of error is the greatest, whether or not it can be compensated for, and if it is economically viable to compensate for such error. The results are then shown, where it is possible to gain information about the sensors’ performance from various graphs. Between Hall and inductive sensors, there were no superior winner, since they both have their strengths and weaknesses. The thesis ends by making recommendations on how to compensate for some of the errors, and how to improve upon the method to make it more automatic in the future.
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LI, XIANG, and 李象. "Inverter-induction motor performance analysis." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/60583838454078409230.
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HUANG, CHIH-YI, and 黃志毅. "Implementation of High Performance Induction Motor Drive System." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/86571539347420328066.
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博士國立成功大學
電機工程學系
88
This dissertation proposes an induction motor drive with current and torque control. The current control based on the current error with the current controller yields the control signal of current controller. The torque control based on the torque error with the torque controller yields a control signal of torque controller. According to the output signal of current controller and torque controller, the appropriate voltage vector is selected by using a look-up table to control the induction motor drive to obtain a rapid speed response. The torque controller, current controller, and stationary reference frame transform are constructed by the hardware which reduce the running time of the microcomputer to obtain a high performance drive. Meanwhile, employing the advantages of the added zero voltage vector to reduce the inverter switching frequency greatly increasing the efficiency of the inverter. This dissertation also presents a control scheme for an induction motor drive which consists of a compensator, neural network identification (NNI) and neural network load torque estimator (NNLTE) based on the conventional proportional-integral (PI) controller. The NNI is a two-layer neural network which uses a projection algorithm to estimate the parameters of the induction motor and to regulate the gain of the compensator such that the response of the induction motor follows that of the nominal plant. The NNLTE is a two-layer neural network which uses the steepest descent algorithm to estimate the load disturbance and forward feed resulting in equivalent control such that the speed response of the induction motor is robust against the load disturbance. Computer simulations and experiment results demonstrate that the proposed method can obtain a high performance induction motor drive.
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Tu, Tang-Chao, and 涂堂釗. "DSP-based Induction motor parameter identification and performance evaluation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/13587622852318879118.
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碩士國立中正大學
機械工程學系暨研究所
102
This thesis is to develop a DSP-based vector control system of the induction motor. Since the main structure of this thesis is induction motor(IM), and then we analyze the (IM) MATLAB Simulink simulation, including current, speed, and position control. In the experiments, we use TMS320F28335 digital signal processor (DSP) motion control card and carry out the sensored motor control. Second, we can know about the vector control theory which is rotor time constant method implementation. In the end, we use different flux current command and explain the efficiency.
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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.
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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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Lee, Tai-Hsing, and 李泰興. "Design of High- Performance V/F Control of Induction Motor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/d5yqh7.
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碩士崑山科技大學
電子工程研究所
97
In this paper, a stable and efficient control of the frequency of pure AC induction motor. AC induction motors is industrial motion control systems and home appliances in the most used motors commonly, structure simple, reliable, low-cost, low maintenance rate, and can be directly connected to AC power, These are the main advantages of AC induction motor.Since the microprocessor and technological progress , constantly improve its performance, gradually reduce the price,it is foreseeable future induction motor control technology will be widely used in various industries.
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Hung, Chen-Ming, and 洪正明. "A HIGH PERFORMANCE ROTOR-FIELD-ORIENTED CONTROLLER FOR INDUCTION MOTOR DRIVES." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/12508183692502900599.
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博士國立清華大學
電機工程學系
85
This dissertation attempts to provide a high performance Rotor-Field- Oriented (RFO) controller which is able to drive the induction motor in both maximum torque and maximum efficiency conditions without incurring the detuning effect induced by iron loss. Basically, contributions of this dissertation are in fivefolds. Firstly, the author proposes an ideal iron loss model which has not only a very simple form but also provides accurate and analytic relation with frequency, flux and slip. Secondly, the author presents a more accurate dynamic model ofinduction motors considering the effect of iron loss, which can preserve the simple form of conventional induction motor dynamic model. Thirdly, by applying the proposed iron loss model to the rotor-fielfluxand slip. Secondly, RFOC can be also preserved. Only the coefficients need to be modified. The effect of iron loss on the RFOC drives can be compensated without adding any extra decouping circuit. So, it is easy to apply thd-Oriented-Control roposed method to the existing RFOC drives. Also, the anald-Oriented-Control (RFOC),yticexpressions of the detuning effect of iron loss on flux, torque and RFO angleare derived for evaluating the effects under different load and velocity conditions. Fourthly, both the maximum torque and maximum efficiency condi tions including the iron loss are derived. It is also found that under RFOC the maxximum torque condition in fact implies the minimum line currentin steady state case. Lastly, based on the proposed dynamic model of the induction motor together with the integrated consideration of efficiency andfast dynamic response, a very simple RFOC is proposed. Although, only simulation studies are conducted, however, from the viewpoints of fast response, high efficiency and simple control configuratin, it is believedthat the proposed controller is very promising.
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Chen, Ming-Yeong, and 陳明勇. "OPERATING PERFORMANCE IMPROVEMENT OF A SINGLE-PHASE INDUCTION MOTOR VIA SWITCHING CONTROL." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/57193418728938301028.
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碩士國立清華大學
電機工程學系
85
The major purpose of this thesis is to study the operating per- formance of a single-phase induction motor by switching controlling its auxiliary winding current. First, the governed equations, equi- valent circuits and steady-state operating characteristics of a single-phase induction motor are derived and simulated. Then accordingly, the intelligent switching control strategy is developed. In the proposed switching controlled single-phase induction motor, while the main winding is permenantly connected accross the AC grid, its auxiliary winding is fed by a current-controlled switching mode inverter. The phase of auxiliary winding current is kept in quadra- ture with those of main winding, but its magnitude is independently controlled by the current- controlled inverter. At starting, within the current ratings of system components, the starting torque can be directly controlled to meet the load requirements. On the other hand, the magnitude of auxiliary winding current is regulated toward the condition of minimum input power at running case using the pro- posed intelligent switching controller. Although the actual ampere- turn balanced can not be achieved simultaneously at this condition, the pulsating torque is neglighly small and thus the mechanical run- ning characteristic can also be improved. For further improving the line drawn current quality, a power factor correction switching con- troller, which is located at the ac source side, is also implemented in the thesis. Through which, the line drawn curent is regulated to be low-distorted, and the power factor is much improved. The proposed switching-controlled single- phase induction motor has the adventages that the starting and running capacitors, the centrifugal switch and the motor parameters are not needed. The overall performance improve- ment of the single-phase induction motor via the proposed controlled stratgies are demonstrated experimentally.
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張明裕. "Study of Squirrel Cage Induction Motor Performance with Die-cast Copper Rotor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/58612690784549694734.
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碩士國立彰化師範大學
電機工程學系
101
In this thesis, the effect of different rotor conductor materials for the motor characteristics is studied. During the experiment, two induction motors are drived to measurement, a induction motor are installed by aluminum rotor and the other one is by copper rotor, and an inverter is used to drive them to operate at various speeds to measure the motor phase current as well as the size of the input power, and the measured induction motor in the long-term operation under conditions of temperature changes, to observe the rotor conductor material for induction motor. A 2-pole, 370 W induction motor is choose, which installed by aluminum die-cast rotor and copper die-cast rotor induction motors respectively. By the experiment results, the average input power of die-cast copper rotor induction motor is 93.3 % to die-cast aluminum rotor induction motor, and the average phase current is 97.8 % to die-cast aluminum rotor induction motor. Finally, when motor operate one hour without cooling fan, the temperature of die-cast copper rotor induction motor is lower 0.7℃ than die-cast aluminum rotor induction motor.
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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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Huang, Guan-Hua, and 黃冠華. "Performance-effective Enhanced Fuzzy Sliding Mode Control for Linear Induction Motor Drives." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/91550909882485402968.
Full textAbstract:
碩士輔仁大學
電機工程學系碩士班
101
In this thesis, an enhanced fuzzy sliding mode control system (EFSMC) with a flux observer is proposed for a linear induction motor (LIM) to achieve the position tracking. First, the dynamic model of LIM is introduced, and the end effect and the friction force are also considered in the observer-based compensation design to cope with the time-varying uncertainties. Then, a sliding mode control (SMC) based on the backstepping control technique is presented. This controller is combined with two fuzzy logic controllers to improve the tracking performance of the LIM. The first fuzzy logic controller is proposed, through a dynamic tune of the sliding surface slope constant of the SMC according to the controlled system states by a fuzzy logic unit. To relax the need of the upper bound of the lumped uncertainties in the SMC, the second fuzzy logic controller is presented, in which the upper bound of the lumped uncertainties can be estimated by a fuzzy inference mechanism. With the proposed EFSMC, the mover of the LIM achieves the good performance and robustness in the tracking of periodic reference trajectories, even with unknown system parameters and/or uncertainties. Also, the computer simulations and experiments for several scenarios are conducted to demonstrate the effectiveness of the proposed controller design.
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Ferreira, Fernando José Teixeira Estêvão. "Strategies to improve the performance of three-phase induction motor driven systems." Doctoral thesis, 2009. http://hdl.handle.net/10316/8549.
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Tese de doutoramento em Engenharia Electrotécnica (Sistemas de Energia) apresentada à Fac. de Ciências e Tecnologia da Universidade de CoimbraElectric motor driven systems (EMODS) account for over 40% of global electrical energy demand, i.e., 7400 TWh per year, and for about 70% of the demand for industrial electrical energy, being by far the most important electrical load. Furthermore, EMODS offer today large efficiency improvement potential, on average within 20% to 30%. If the energy saving potential associated with EMODS becomes effective, the consumption of a huge amount of fossil fuels can be avoided. The greenhouse gas emissions can significantly be reduced at zero or even negative costs, since the efficiency improvement measures in EMODS are, in general, cost-effective. Therefore, EMODS can play a key role in helping many countries’ efforts to meet the post-Kyoto targets. This can strongly contribute to combat climate change and fossil fuel dependency of modern economies, providing that, at the same time, other measures are implemented, namely the promotion of renewable energies. If all EMODS were optimized, energy cost savings could reach 65-100 G€ per year worldwide and a huge amount of greenhouse gas emissions could be avoided. Nowadays, in the scope of world energy issues, the importance of the performance improvement of EMODS is evident. However, in most cases, the investment in energy efficiency is not yet a major concern in new plants or during refurbishment. This thesis is meant to be a contribution on that scope, offering several comprehensive overviews and novel contributions on different EMODS-related topics. Briefly, recent developments and strategies to improve the performance of EMODS integrating three-phase induction motors, which account for the largest majority of the industrial electric motors, are addressed, including technical, economical, and policy aspects. The focus is on the efficiency and reliability of EMODS, being discussed several related topics such as motor performance, variable-speed drives, power quality, mechanical transmission, and system design. The end-use or mechanical-load devices are not analysed in terms of intrinsic performance, although the speed variation impact on the respective required power is taken into account. Motor efficiency and life-cycle cost related aspects are analysed, and information regarding motor standards, eco-design and market transformation, is presented. The impact of motor speed variation and inverters on EMODS efficiency and reliability is also addressed, including a comparison between 2-level and 3-level voltage-source inverters. Regarding three-phase induction motors, useful methods for in-field motor load estimation are analysed, being proposed a number of improvements in some well-known methods. Novel considerations on stator winding specifications and connectionmode change, as a function of the motor actual operating conditions, for both two-connection (delta or star) and multi-connection motors, are presented, including the discussion of theoretical, simulation (motor models), and implementation issues. Regarding the stator winding connection-mode management, besides the general proposed methodology, it is also proposed a novel electronic device for that purpose. Methodologies for stator winding optimization and/or customization, particularly useful for the rewinding process, including a tutorial and a user-friendly stator winding redesign software to help rewinders to improve motor performance for each particular situation, are proposed. Due to its present relevance, power quality impact on line- and inverter-fed motors is also discussed. A number of considerations on motor and EMODS reliability, including a comprehensive and extensive analysis on bearing currents and on voltage transients associated with inverter-fed motors, are presented. The most important contributions were previously published in national and international journals and/or conference proceedings. Some of the topics addressed in this thesis are still under research and future publications on them are expected.
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Jiang, Dian-Feng, and 江典峰. "Study of Fuzzy Controller for Improving Decoupled Control Performance of Induction Motor Drives." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/01227328723726175010.
Full textAbstract:
碩士國立成功大學
工程科學系碩博士班
94
The induction motor is widely utilized in industry because its advantages including stability of rotating speed, simple structure, low cost, and mechanical robustness. Decoupling control is one kind of control strategies developed in recent years for induction motor drives. Its main idea is to reduce coupling between d-q current dynamics of the induction motor. A dynamic decoupling controller mentioned in this thesis is one kind of decoupling control schemes that has better decoupling control performance than many kinds of conventional controllers. It still has disadvantage, as when there are motor parameter estimation errors, decoupling control performance would be reduced sharply. To solve this problem, application of fuzzy theorem is proposed to enhance control performance of the decoupling controller. The fuzzy controller generates coupling compensation voltages to adjust the voltage commands produced by the decoupling controller. Through appropriate fuzzy rules and input/output membership functions setting, better decoupling control performance and system responses can be obtained. Combining the proposed decoupling controller after fuzzy controller is added and the digitalized PWM algorithm to generate three-phase voltage control signals to the induction motor drive. A 32-bit TMS320F2812 digital signal processor and motor driver circuit are used to implement this whole control scheme. Simulation and experiment results demonstrate that the proposed control scheme is superior to the original decoupling controller.
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Cheng, Jung-Chieh, and 鄭榮杰. "Improvement in Performance of a Three-phase Induction Motor in Electric Multiple Units." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2t7nxj.
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碩士國立高雄應用科技大學
機械工程系
106
The purpose of this dissertation is to improve the design of non-synchronous three-phase AC induction motors to reduce the cogging torque, to avoid damage to coils and cracks in the rotor's short-circuit ring due to the damage caused by non-uniform torque acceleration bearings, resulting in the operation of the electric motor train. Loss. The asynchronous three-phase AC induction motor used in this study is a traction motor used by the Taiwan Railway Administration’s EMU500 electric car, as the electric car is an important means of transport for short-distance commutes in China. The motor has a light weight and a large output torque. The advantages of simple structure, easy maintenance, but the current motor failure is more than half of the bearing damage, has affected the effective use of vehicle scheduling and grouping. In this thesis, JMAG's electromagnetic simulation finite element analysis software is used to design and analyze the three-dimensional theoretical model of the motor. The parameters include: air gap width, silicon steel sheet material, rotor chute design, bifurcation slot winding design, etc., and the magnetic flux density of the motor can be known. , Output torque, and torque ripple, the study found that the air gap width and rotor design parameters of the two parameters can effectively the cogging torque. This study proposes that the design of non-synchronous three-phase AC induction motors used in electric vehicles should be improved in the future. If the air gap width can be changed from the existing 1.0 mm to 1.5 mm, and the rotor chute is adjusted to an angle of 3.33 and the material of the silicon steel sheet is changed to 35CS250 It can reduce the torque ripple from the current 24.48% to 17.70%, which is expected to reduce the risk of coil burnout and rotor short-circuit ring cracking caused by the bearing loss of the motor, and reduce the failure rate and maintenance of the electric vehicle. maintenance.
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Shiau, Lin-Goei, and 蕭霖癸. "Robust Speed and Position Control for a High Performance Induction Motor Drive System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/98442279992800783102.
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博士國立成功大學
工程科學系
89
Firstly, two mathematical representations of an induction motor (IM) have been presented in this work. One is the d-q model derived from a machine winding structure viewpoint with a proper axis transformation. It is used in the sliding mode controller design. The other is the energy form model which is derived based on an energy point of view and used in passivity based controller design. Moreover, two representations are verified to be mathematically equivalent. After introducing the IM models, the sliding mode control theory is presented. In addition, a new sliding mode current scheme is proposed for IM speed drives based on the d-q model, and then it is extended to position control. Unlike the existing sliding mode current control schemes, the parameters of the outer-loop position and speed controllers are considered in the inner-loop sliding mode current controller design. Rigorous stability verification for the overall system is presented. The proposed control scheme has been implemented by a PC-based controller for both IM speed and position drives. The overall system exhibits robust stability and robust performance despite the presence of motor parameters and shaft moment of inertia variations as well as exogenous load disturbances. Finally, a passivity based control scheme is proposed respectively for the voltage-fed and current-fed speed drives based on the energy form model. A distinguished feature of this control scheme is that the rotor flux estimator is not necessary for IM drives applications. An IM drive with voltage-fed and/or current-fed inverters is successfully implemented by DSP-based controller and the results are compared from a stability and a performance point of view.
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Shih, Tung-Che, and 石東哲. "The study of using I-PD controller to improve the induction motor transient performance." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/15573990938248453341.
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碩士國立臺灣海洋大學
機械與機電工程學系
93
Abstract When the inverter drives AC induction motor, the transient response of instant state or speed changed quickly will affect the current and speed character. It is different from steady state character. In this paper, we proposed an I-PD type controller, it is not only improve the transient response of PD controller, but also improve the steady state error of PI controller. The experimental results are provided to confirm the performance and effectiveness of the proposed control scheme. We will proof the I-PD controller which one is the best by experiment. The experimentation are made PI, PID, I-PD controller and designed into inverter that drive AC induction motor, and via step response and load change response for analyze variation in speed of AC induction motor, and watch line current of motor. Finally we will check vibrating and temperature of motor when running. Keywords: I-PD controller, vector control, transient response, motor driver.
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Tseng, Chun-Han, and 曾俊翰. "Design of Fuzzy Cerebellar Model Articulation Controllers for High Performance Induction Motor Vector Control System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/vxu733.
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碩士國立臺北科技大學
機電整合研究所
94
In this thesis, a Fuzzy Cerebellar Model Articulation PI controller (FCMAPIC) is proposed and embedded into the induction motor vector control system to control speed. Moreover, the system parameters are estimated by using an additional cerebellar model articulation controller. Same as conventional CMAC, the advantages of the FCMAPIC include rapid learning convergence, simple structure, on-line training, and non-linear learning ability. With the aid of projection algorithm, the FCMAC is applicable for on-line control. Essentially, FCMAC is a control method by introducing the fuzzy logic concept into the CMAC. Therefore, the value of input layer can be arbitrary real number in the interval between 0 and 1, and hence can increase the convergence accuracy of system error. To estimate the system parameters, the induction motor drives adopt the Direct Field Orientation Control (DFOC) and adaptive control law to conduct the adaptive pseudo reduced order flux observer, for the sensorless induction motor vector control system considered in this thesis, to adjust the parameters according to the variations of IM characteristics. To establish the sensorless control and prevent the drift of rotor flux, the CMAPIC is used to control the speed and estimate the rotor resistance. From the experimental results, in the operation conditions: the range of speed is set from 2% to 100% of rated speed, and the load condition is 8Nm, it is seen that the speed response of induction motor vector control system equipped with the FCMAPIC outperforms and the robustness to parameter variations is retained .
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Huang, Ming-Shi, and 黃明熙. "ESTABLISHMENT OF A FIELD-WEAKENED INDIRECT FIELD-ORIENTED INDUCTION MOTOR DRIVE AND ITS PERFORMANCE IMPROVEMENT STUDY." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/67215570904424820397.
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博士國立清華大學
電機工程學系
93
This dissertation is mainly concerned with the transient and static performance improvements for a field-weakened (FW) indirect field-oriented (IFO) induction motor driver. First, the operating characteristics of an IFO induction motor drive under conventional field-weakening control are studied to comprehend its limitations. Then the improved field-weakening scheme is proposed. In which, a normal d-axis flux current command is first set. It consists of a major component generated based on improved approach, a loading compensating and a transient compensating components. The last two components are added to yield closer current tracking control during transient period. In addition, a simple robust current controller and a detuning compensator are developed to enhance the current tracking performance of a detuned induction motor. As the transient being elapsed and entering static period, the slip angular speed command or the flux current command is tuned to let the motor quickly reach a stable condition having improved energy conversion efficiency. Having established the induction motor drive with adequate field-weakening scheme, its speed control improvement is made. To yield good tracking and regulation speed control performances, the proposed control scheme consists of a feedback controller and a command feedforward controller (FC) to possess two-degree-of-freedom (2DOF). At nominal case, the feedback controller is designed according to the given regulation control requirements, and the command feedforward controller is set as the inverse of plant nominal model to let the tracking response follow the one defined by a reference model. Then, to reduce the effects of system dead-time and parameter variations on the speed control performance, a variable-structure system (VSS) adapted dead-time and disturbance compensator (DTDC) is developed. An estimated signal containing plant uncertainties and disturbances is generated and used for canceling their effects on dead-time compensation control. Moreover, the tracking response is further enhanced by on-line adjusting the parameters set in the FC and the DTDC according to the estimated mechanical inertia change. Finally, the closed-loop regulation control is provided by adding a model following control scheme. In performing the analysis and design of the constituted components in a motor drive, a suitable simulation tool is preferable. Hence finally in this dissertation, a Simulink-based simulation environment for the established FW IFO induction motor drive is built up. Some simulation results are provided to verify the correctness of the established simulation scheme.
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林元瑞. "The Effect of Harmonic Phase Angle on the Operation Performance of a Three-phase Induction Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/05468392587198474730.
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碩士國立臺北科技大學
機電整合研究所
88
Abstract This thesis uses a real load test to investigate the effect of various harmonic orders and phase angles on the operation performance of a three-phase induction motor. In the test, the voltage harmonic orders from 2 to 7, the voltage harmonic distortion factors (VDF) are 15% and 20%, respectively, were chosen, and according to different phase angle, each harmonic order was designed into 8 kinds of waveforms which phase angles are 0, 45, 90, 135, 180, 225, 270, 315. The experimental data includes input current, efficiency and temperature rise. From the test result, it can be found that the operation performance of a three-phase induction motor varies by not only different voltage harmonic orders and VDF but also phase angles of each individual harmonic. The effect of harmonic phase angles is hardly known by direct observation on the operation performance of a three-phase induction motor. Therefore, this thesis uses back-propagation neural network to find the suitable parameters by learning, and can simulate the harmonic problems correctly on the operation of a three-phase induction motor. The advantages of neural network is not need to do too many times experiments and can get correct results but the simulation only can be applied on the induction motor, which this thesis proposed.
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Pitis, Constantin. "Novel method of improving squirrel cage induction motor performance by using mixed conductivity fabricated rotors (MCFR) / Constantin Danut Pitis." Thesis, 2006. http://hdl.handle.net/10394/1466.
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Tsai, Ming-Fa, and 蔡明發. "A Research on the Real-Time Adaptive Control of High-Performance AC Induction Spindle Motor Drives Using Parallel Processing Technique." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/82475597912376437952.
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博士國立交通大學
電子工程學系
85
In this dissertation, we develop a real-time adaptive control technique, which enables the high-performance control of an ac induction spindle motor drive for CNC machine tools, and develop a transputer-based parallel processing technique for the realization of the complicated and real-time adaptive control algorithm. The induction spindle drive can adaptively regulate the speed performance in contending with varying load, torque disturbance, and motor parameter variations. The control system consists of adaptive speed control, adaptive torque control, and adaptive current control. The adaptive torque control comprises rotor-time constant adaptation for field-oriented vector control, load-torque estimation and feedforward compensation, and field-weakening flux control. The adaptive speed controller, which precedes the field-oriented control loop, consists of a two-degree-of-freedom controller and a speed-controlled plant model estimator. The two-degree-of-freedom controller is designed by a pole-placement technique with polynomial manipulations. Its parameters are adjusted adaptively in terms of estimated model parameters. Estimating the model parameters entails a second-order least-squares estimator with constant trace to avoid estimator windup. The adaptive current controller, operating in the stationary two-axis frame for providing the persistently exciting condition for parameter estimation convergence, consists of an one-step-ahead predictive controller and a model estimator. The predictive controller*s parameters are adjusted adaptively in terms of estimated model parameters. Estimating the model parameters entails a first- order four-dimensional least-squares estimator with variable forgetting factor to detect the variations of the motor parameters and back emf. In the adaptive torque controller, which precedes the current control loop, the design of the feedforward load torque compensator is based on an estimated load-torque model. Estimating the load torque entails a first- order three-dimensional least-squares estimator with variable forgetting factor and covariance resetting, whose purposes are to detect any slow or sudden changes of torque disturbance, respectively. A simple implementation scheme for the PWM waveform generation, which modulates the current control outputs as three-phase PWM pulses to drive the motor, based on space vector concept is also presented. The computation of the resulting adaptive speed, torque, and current controller is very complex. However, the system exhibits some implicit parallel characteristics because of the nested control loops. So, it has been implemented in parallel by IMS T800-20 transputers. For the realization of the parallel adaptive control algorithm, a unified controller architecture comprising transputer-based parallel computing boards and input/output boards suitable for the real-time control of various types of motor drives is also presented. The system can increase its computing and input/ output processing capability by paralleling these boards. A host server based on a personal computer for user interface is also developed. The control functions can easily be implemented in parallel by using the high-level programming language Occam. A comparison with two existing parallel controllers shows the performance and architecture features of the system. Experimental results show that the adaptive control system maintains the desired torque-producing current and speed performance in the presence of varying load and disturbance. The work can be the basis of the research for high-speed and high- power ac induction spindle drive for CNC machine tools in the future.
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Liu, Yi-Hwa, and 劉益華. "High Performance Inductin Motor Control Methods." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/16890976991585651020.
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Oliveira, José Miguel Pinheiro. "Dispositivo eletrónico para melhoria do desempenho dos motores de indução trifásicos." Master's thesis, 2014. http://hdl.handle.net/1822/34480.
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Dissertação de mestrado em Engenharia MecatrónicaEstudos realizados por organizações internacionais comprovam que a maioria dos motores de indução trifásicos com rotor em gaiola de esquilo, com potências superiores a 4 kW e que funcionam com velocidade fixa1, utilizam o método de arranque estrelatriângulo. Nesta dissertação é proposto o desenvolvimento de um dispositivo eletrónico para seleção automática do tipo de ligação dos enrolamentos estatóricos dos motores de indução trifásicos com rotor em gaiola de esquilo, em função da sua carga. Este dispositivo é particularmente adequado para motores de média potência, com uma variação de carga significativa durante o seu ciclo de funcionamento, incluindo longos períodos de operação com carga baixa. A principal vantagem está no controlo automático do modo de ligação dos enrolamentos estatóricos, em estrela ou triângulo, em função da carga aplicada ao motor. Em aplicações de carga variável e velocidade fixa, este controlo permite melhorar significativamente o rendimento e fator de potência do motor. Tratando-se de um dispositivo de estado sólido, em que os contactores eletromecânicos são substituídos por eletrónica de potência, é possível minimizar o tempo de comutação, e consequentemente o deslizamento pela redução do tempo de comutação, relativamente à comutação estrela-triângulo convencional. A solução proposta permite também eliminar os três contactores utilizados nos arrancadores estrela-triângulo convencionais. Além disso, este dispositivo, caso seja instalado na caixa de terminais, como é o objetivo final, permite eliminar três dos seis condutores necessários para os arrancadores estrela-triângulo, traduzindo-se em poupanças muito significativas em cabos para novas instalações de motores. Adicionalmente, há um conjunto de funcionalidades que podem ser incorporadas no dispositivo como monitorização de consumos, proteção do motor e diagnósticos de avarias.
Studies by international organizations show that the majority of three-phase squirrel-cage induction motors, with an output power over 4 kW and running with fixed speed2, use the star-delta starting method. In this dissertation is proposed the development of an electronic device for automatic selection of connection type of stator windings of three-phase squirrel-cage induction motors, depending on their load. This device is particularly suitable for medium power motors, with a significant load variation during operation cycle, including long periods of operation at low load. The main advantage is the automatic control of the connection mode of the stator windings in star or delta, depending on the load applied to the motor. In variable load and fixed speed applications, this control allows to significantly improve the efficiency and power factor motor. Being a solid state device, in which the electromechanical contactors are replaced by power electronics, it is possible to minimize the switching time, and thus slip reducing the switching time, relative to the conventional star-delta switching. The proposed solution also eliminates the three contactors used in conventional star-delta starters. In addition, this device, if installed in the terminal box, which is the final objective, allows to eliminate three of the six conductors required for the star-delta starters, resulting in very significant savings in cables for new motor installations. Additionally, there is a set of features that can be incorporated into the device as monitoring of consumption, motor protection and fault diagnostics.
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Lin, Ying Xi, and 林盈熙. "The high performance nonlinear adaptive control of induction motors." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/70893929669050999490.
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蔡宏儒. "The High Performance Adaptive Control for Current-Fed Induction Motors." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/58457899762786574792.
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碩士中原大學
電機工程學系
85
The induction motors driven by current-controlled inverters have high-gain current loops so that the stator currents may be assumed to be the controls. If the stator currents, instead of stator voltages, are regarded as the control inputs, the dynamic model of the induction motor can be reduced from a fifth order system to a third order one. On the basis of measurable rotor speed, stator current and stator voltage, the control design methodology for speed tracking and torque tracking problems of the current-fed induction motors with unknown rotor resistance and loading torque is proposed in this thesis. By means of introducing an auxiliary signal to relate the rotor flux error with the measurable signals, the sensor or observer of the rotor flux for the state feedback is not necessary to implement the controllers. The control design is carried out by means of the concept of backstepping method and the concept of desired state variables, which are determined by the optimal generated torque, the desired torque, and stability consideration. Under the condition of persistent excitation, the speed tracking error is shown to asymptotically approach zero and the torque tracking error to exponentially approach zero, whereas all of the internal signals are bounded. Using a similar procedure, a position tracking controller is proposed following in sequence to the speed tracking controller mentioned above. Furthermore, the speed sensorless control design is developed. In this issue, the speed observer and the observed-based controller for the induction motor with unknown rotor resistance is constructed under a mild assumption of zero initial values. Finally, the good performances of the proposed controllers are demonstrated by numerical simulations and experimental tests, respectively.
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Yeh, Yi-Hao, and 葉玴豪. "Performance Comparison of PWM Strategies for Inverter-Fed Induction Motors Based on Fish Coordinate Transformation Technique." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/86133336807768233382.
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碩士國立成功大學
工程科學系碩博士班
91
The fish coordinate transformation is mainly investigated in this thesis. The detailed calculation and inspection insight reveal that the current and torque ripples are directly related to the variations of the fish coordinates of and , respectively. The harmonic effects on the motor can be thereby obtained by observing the shape of the flux fish. On the other hand, if the starting angle r in the fish coordinate transformation is chosen appropriately, the fish transformation technique can be applied to the various PWMs. The intact and symmetric flux fish can be obtained. It can be used to calculate the harmonic figure F and judge the merits of the various switching patterns. In this thesis, the fish coordinate transformation is originally applied to the voltage-space vector pulsewidth modulation (VSV-PWM). On the basis of the same conditions of fixed switching and the electric frequency of the stator, it shows that the performance of VSV-PWM is superior to that of S-PWM from a viewpoint of the figure of the quality measure F and the total harmonic distortion THD. To reduce the switching losses, a switching table of voltage vector is derived for VSV-PWM. Its flowchart completely illustrates the design procedure. In addition, the direct torque control theory is also reviewed in this thesis. It includes the flux and torque hysteresis controls. By virtue of the principle of alignment of the flux and voltage vectors of the stator, the vector switching table can be derived. The flux hysteresis control is treated as one kind of PWM in the thesis so that the shape of flux fish can be used to evaluate its figure of merit. Unfortunately, the symmetry of the flux fish can be not maintained due to the variable frequency switching. The key point of the switching pattern of the fish method is included in this thesis. By analyzing the merits and faults, the differences among various switching patterns are revealed. In the end, comparison results verified by simulation and experiments are also presented.
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Huang, Chini, and 黃勤益. "FPGA-Based Robust Adaptive Control System Design Integrated with Soft-Computing Approach for the Performance Improvement of Linear Induction Motors." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/34391997046953161693.
Full textAbstract:
碩士輔仁大學
電機工程學系
100
In this thesis, a robust adaptive speed/position tracking control system is proposed for a linear induction motor (LIM) taking into account the longitudinal end effects and uncertainties including the friction force. The dynamic mathematical model of an indirect field-oriented LIM drive is firstly derived for controlling the LIM. On the basis of a backstepping control law, a sliding mode controller (SMC) with embedded fuzzy boundary layer is designed to compensate the lumped uncertainties during the tracking control of periodic reference trajectories. Since it is difficult to obtain the bound of lumped uncertainties in advance in practical applications, an adaptive tuner based on the sense of Lyapunov stability theorem is derived to adjust the controller parameters in real-time. Furthermore, it also confronts the increasing disturbance and uncertainties. In addition, it is a quite complicated process of parameter tuning for the proposed controller due to the difficulty arisen from lacking of the accurate mathematical model of a system accompanied with unknown disturbance. The combination of the adaptive neural fuzzy inference system (ANFIS) and genetic algorithm (GA) is adopted to optimize the controller parameters. The whole process of using ANFIS and GA is applied to tune the controller parameters, model the designed objective function, and determine the optimized control gain, in sequence. The effectiveness of the proposed control scheme is validated through simulations and experiments for several scenarios. In addition, the advantages of performance improvement and robustness are illustrated at the end of the optimization procedure.