• Title, Summary, Keyword: Induction motor model

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High Frequency Model of Inverter-fed Induction Motor (인버터 구동 유도 전동기 고주파 모델링)

  • Hong, Sun-Ki
    • Proceedings of the KIEE Conference
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    • pp.795-797
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    • 2001
  • Voltage varing Fate dv/dt which is applied to induction motor usually makes unnegligible leakage current and it flows through stator winding and motor frame. This kind of harmonic leakage current makes effect on power source and cuases electromagnetic trouble because the motor frame has earth. Therefore in this study, a high frequency induction motor model is developed and analyze the motor performance to explain the phenomena. Inverter model is also developed and is combined with the motel model to prepare the basis of the high frequency effects on inverter fed induction motor.

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Sensorless Speed Control of Induction Motor by Direct Torque Control with Numerical Model (수식모델의 직접토크제어에 의한 유도전동기의 센서리스 속도제어)

  • Yoon, Kyoung-Kuk;Kim, Sung-Hwan
    • Journal of the Korean Society of Marine Engineering
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    • v.36 no.6
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    • pp.830-836
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    • 2012
  • Various control algorithms have been proposed for the speed-sensorless control for an induction motor. These control schemes are mainly based on the speed feedback with the flux and speed estimations. This paper proposes another method for the speed-sensorless control for an induction motor. The proposed scheme is based on the torque and flux compensation without speed estimations, in which the same controlled stator voltage is applied to both the induction motor and the numerical model so that the differences between torques and fluxes of the model and the induction motor may be compelled to give access to zero. The results of experiment show the effectiveness of the scheme.

A Study on Dynamic Characteristics of Induction Motor System (유도전동기 시스템의 동특성 연구)

  • Lee Hyoung-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.5
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    • pp.128-136
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    • 2006
  • To predict the noise and vibration characteristics of induction motor system, it is necessary to develop the mathematical model including all the mechanical elements such as shaft, blower, rotor, fan, bearing, case and mounting parts. Coupling effect between case-mount system and rotor- shaft system including shaft, blower, rotor, fan and bearing is examined. Impact exciting experimentation was done in order to verify vibration model of the induction motor system. From experimental results, we can appreciate that the natural frequencies of induction motor system are in good agrements with analysis.

Speed Sensorless Vector Control of Induction Motor Using a Reduced-model Extended Kalman Filter (축소모델 확장 칼만필터를 이용한 유도전동기의 센스리스 벡터제어)

  • Heo, Jong-Myung;Seo, Young-Soo
    • Proceedings of the KIEE Conference
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    • pp.1141-1143
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    • 2001
  • This paper presents a detailed study of the reduced-model extended Kalman filter(EKF) for estimating the rotor speed of an induction motor drive. The general structure of the Kalman filter is reviewed and the various system vectors and matrices are defined. By including the rotor speed as a state variable, the EKF equations are established from a discrete two axis model of the three-phase induction motor, using the software MATLAB/Simulink, simulation of the EKF speed estimation algorithm is carried out for an induction motor drive with indirect vector control.

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Identification of Induction Motor Using TS Fuzzy (T-S Fuzzy를 이용한 유도전동기의 Identification)

  • Lee, Dong-Kwang;Park, Seung-Ho;Kwak, Gun-Pyong;Park, Seung-Kyu
    • Proceedings of the KIEE Conference
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    • pp.1856-1857
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    • 2011
  • Induction motor is nonlinear multivariable system. It is not easy to control precisely. Usually Induction motor need linearized model in order to make it easy to control. In this paper, linearized model of nonlinear model in induction motor can change by using TS Fuzzy Identification.

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Simulations of the Inverter-Fed Induction Motor Model Considering Leakage Current (누설 전류를 고려한 인버터 구동 유도 전동기 모델 시뮬레이션)

  • Hong, Sun-Ki
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.5
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    • pp.70-76
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    • 2010
  • It is required to analyze the characteristics of inverter-fed induction motor according to the increase of inverter uses. However the previous simulation researches usually uses simplified induction motor model and fixed power source because the difficulties of their modeling and analysis. In this study, high frequency induction motor is simulated and the induction motor model considering high frequency characteristics is developed and it is combined with inverter model. With these, from the sinusoidal commercial frequency to PWM high frequency, induction motor characteristics can be simulated and analyzed.

Analysis of the Bearing Fault Effect on the Stator Current of an AC Induction Motor (유도전동기의 고정자 전류에 미치는 베어링 고장 영향 분석)

  • Kim, Jae-Hoon;Lee, Dong-Ik
    • Journal of Institute of Control, Robotics and Systems
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    • v.20 no.6
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    • pp.635-640
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    • 2014
  • Detection and diagnosis of incipient bearing fault in an induction motor is important for the prevention of serious motor failure. This paper presents an analysis of the effect of a faulty bearing on the stator current of an induction motor. A bearing fault leads to torque oscillations which result in phase modulation of the stator current. Since the torque oscillations cause specific frequency components at the stator current spectrum to rise sharply, the bearing fault can be detected by checking out the faultrelated frequency. In this paper, a mathematical model of the load torque oscillation caused by a bearing fault is presented. The proposed model can be used to analyze the physical phenomenon of a bearing fault in an induction motor. In order to represent the bearing fault effect, the proposed model is combined with an existing model of vector-controlled induction motors. A set of simulation results demonstrate the effectiveness of the proposed model and represent that bearing fault detection using a stator current is useful for vector-controlled induction motors.

Study on Predicting Induction Motor Characteristics of Alternate QD Model Under Light Loads by Comparing Performance of MTPA Control (단위전류당최대토크 제어기의 성능 비교를 통한 경부하에서 대안모델의 유도전동기 동특성 예측에 관한 연구)

  • Kwon, Chun-Ki;Kim, Dong-Sik
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.1
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    • pp.65-71
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    • 2016
  • This study investigates a high-accuracy alternate QD model to estimate the characteristics of induction motor under light loads. To demonstrate the usefulness of the alternate QD model, a maximum torque per amp (MTPA) control based on the alternate model is shown to outperform MTPA control based on the standard QD model. The experimental study conducted in this work exhibits that the MTPA control based on the alternate QD model tracks torque commands between 20 Nm and 30 Nm with 5% error, whereas the MTPA control based on the standard QD model generates torques lower by over 23% compared with the aforementioned torque commands. This result indicates that the alternate QD model is a highly accurate model for induction motors under light loads.

Development of Composite Load Models of Power Systems using On-line Measurement Data

  • Choi Byoung-Kon;Chiang Hsiao Dong;Li Yinhong;Chen Yung Tien;Huang Der Hua;Lauby Mark G.
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.161-169
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    • 2006
  • Load representation has a significant impact on power system analysis and control results. In this paper, composite load models are developed based on on-line measurement data from a practical power system. Three types of static-dynamic load models are derived: general ZIP-induction motor model, Exponential-induction motor model and Z-induction motor model. For the dynamic induction motor model, two different third-order induction motor models are studied. The performances in modeling real and reactive power behaviors by composite load models are compared with other dynamic load models in terms of relative mismatch error. In addition, numerical consideration of ill-conditioned parameters is addressed based on trajectory sensitivity. Numerical studies indicate that the developed composite load models can accurately capture the dynamic behaviors of loads during disturbance.

Power Loss and Thermal Characteristic Analysis of Induction Motors for Machine Tool Spindle according to the Rated Power-Speed (공작기계 스핀들용 유도전동기의 용량-속도에 따른 손실 및 발열특성 해석)

  • Seong, Ki-Hyun;Cho, Han-Wook;Hwang, Joo-Ho;Shim, Jong-Yeob
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1668-1677
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    • 2013
  • This paper deals with the power loss and thermal characteristics of induction motor for machine tools according to the rated power and speed. To reduce the fabrication error by thermal strain in rotational machine tools, we calculated the power loss and thermal behavior of induction motors. Firstly, the inverse design of general induction motors for machine tool spindle has been performed. The inverse design results are compared with the torque-speed characteristic curve in motor's catalog. The power loss are calculated by finite element method(FEM) at rated condition. Secondary, the transient thermal characteristics of induction motors are calculated by equivalent thermal resistance model from Motor-CAD S/W. The inverse design, power loss and thermal behavior calculation for induction motors with various rated power and speed has been performed. Finally, to verify the design and calculation process of induction motor, we implemented the experimental set with 0.4kW 1710rpm class industrial induction motor model. The obtained thermal characteristics of experimental model confirmed that the design and power loss calculation processes are appropriate to the prediction of thermal strain in rotational machine tools.