• 제목/요약/키워드: Rotor Speed

검색결과 1,975건 처리시간 0.027초

회전자 시정수를 보상한 유도전동기 센서리스 벡터제어 (Sensorless Vector Control of Induction Motor with Rotor Time Constant Compensation)

  • 박철우;이무영;윤경섭;구본호;권우현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 B
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    • pp.493-496
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    • 1998
  • Several sensorless vector control methods of induction motor have been proposed, but these methods don't have the satisfying performance to the change of the rotor time constant. Therefore, this paper proposes the sensorless vector control method which estimates the rotor speed using MRAS and compensates the rotor time constant using current error feedback at the same time. This method can guarantees the accurate performance of sensorless vector control while the rotor speed and the rotor time constant are changing. This method is verified by computer simulation using SIMULINK in MATLAB.

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동적 고성능 응답을 위한 유도전동기의 근사적 비간섭 제어 (Asymptotic Decoupled Control of Induction Motors for High Dynamic Performance)

  • 김동일;고명삼;하인중;박재화
    • 대한전기학회논문지
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    • 제38권11호
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    • pp.877-887
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    • 1989
  • In this paper, we attempt to achieve high dynamic performance by means of decoupled control of rotor speed and flux. Recently developed nonlinear feedback control theories are utilized. The rotor fluxes are estimated based on the rotor circuit equations. When the estimation error of the rotor flux tends to zero, the rotor speed and flux dynamic characteristics of the induction motor with our controller become linear. To minimize the deterioration of control performance, we use an identification algorithm for the rotor resistance. We analyze the dynamic behavior of the closed loop system with our controller. Both simulation and experimental results are included to demonstrate the practical significance of our result. In particular, our experimental results show that recently developed nonlinear feedback control techniques are of practical use in control of induction motors.

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An Effective Rotor Current Controller for Unbalanced Stand-Alone DFIG Systems in the Rotor Reference Frame

  • Phan, Van-Tung;Lee, Hong-Hee;Chu, Tae-Won
    • Journal of Power Electronics
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    • 제10권6호
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    • pp.724-732
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    • 2010
  • This paper presents an effective rotor current controller for variable-speed stand-alone doubly fed induction generator (DFIG) systems feeding an unbalanced three-phase load. The proposed current controller is developed based on proportional plus two resonant regulators, which are tuned at the positive and negative slip frequencies and implemented in the rotor reference frame without decomposing the positive and negative sequence components of the measured rotor current. In addition, the behavior of the proposed controller is examined in terms of control performance and stability with respect to rotor speed variations, i.e., slip frequency variations. Simulations and experimental results are shown to validate the robustness and effectiveness of the proposed control method.

자기저항법을 이용한 외전형 BLDC 모터의 해석 및 설계 (Analysis and Design of Outer-Rotor Type BLDC Motor by Permeance Method)

  • 최명종;김선대;정태경
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1995년도 하계학술대회 논문집 A
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    • pp.86-88
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    • 1995
  • Outer-rotor type brushless motor is designed to run at more constant speed because of large inertia comparing with inner-rotor type. The constant speed is acquired by increasing inertia. Also, the generating torque is proportional to the rotor volume, i. e. rotor diameter. The main idea in this study is to design and analyze the outer-rotor type brushless motor by permeance method with given outer dimension.

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최적화기법을 이용한 고속 탄성회전체의 밸런싱 (An Optimal Correction Balancing of A High-Speed Flexible Rotor)

  • 이용복;이동수;최동훈
    • 대한기계학회논문집
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    • 제19권6호
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    • pp.1402-1410
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    • 1995
  • An influence coefficient method with an optimal correction balancing algorithm is developed for balancing a high-speed flexible rotor system. Conventional flexible balancing algorithms such as least square and weighted least square algorithms may not satisfy allowable residual vibration levels in certain speed ranges, while the optimal correction balancing method can be more effective in controlling vibration levels in a target speed. Related analyses were reviewed and applied to a test rig to show the effectiveness of the optimal correction balancing method.

파라메타 변동에 강인한 유도전동기의 속도센서리스 벡터제어 (Robust Speed Sensorless Vector Control of Induction Motor for Parameter Variations)

  • 김상욱;김승범;김진수;김영석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 F
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    • pp.2113-2116
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    • 1997
  • The speed sensorless vector control of induction motor using the rotor speed and flux estimation is widely used. In practice, these schemes depend on the accurate parameters of the machine. If in the vector control scheme an inaccurate parameter of induction motor due to skin effects and to temperature variations is used. it is difficult to achieve correct field orientation. From this reason. we propose robust speed sensorless vector control of induction motor against the variations of parameter and disturbance by using extended Kalman filter. For speed and rotor flux estimation. conventional adaptive flux observer is applied. extended Kalman filter which is correctly capable of estimating rotor flux and load by eliminating virtually influences of structural noises is proposed. Simulation results show the effectiveness of the control strategy proposed here for the induction motor drives.

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확장된 칼만 필터를 이용한 속도 및 검출기가 없는 IPMSM의 최대토크 운전 (Maximum Torque Operation of IPMSM Drives without Speed & Rotor Position Sensors Using An Extended Kalman Filter)

  • 김윤호;윤병도;국윤상
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1996년도 창립기념 전력전자학술발표회 논문집
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    • pp.21-25
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    • 1996
  • To control the speed of IPMSM drives it is necessary to know the speed and the rotor position. This is normally done by measurement of this values with electromechenical sensors. In this paper, a new approach to the position elimination method for the high performance variable speed IPMSM drives with the current controlled PWM technique is presented. For the high performance drive capability in the speed region, a Extended Kalman filter algorithm is adopted to estimate the rotor position as well as the angular velocity for the practical sensorless IPMSM drives. The high performance drive characteristics of the proposed method are verified using the wide simulation.

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임팩트 테스트를 이용한 초고속 회전체용 공기 포일 베어링의 동특성 계수 측정 (Measurement of Dynamic Coefficients of Air Foil Bearing for High Speed Rotor by Using Impact Test)

  • 박철훈;최상규;함상용
    • 한국유체기계학회 논문집
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    • 제14권1호
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    • pp.5-10
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    • 2011
  • MTG(Micro turbine generator) operating at 400,000 rpm is under development and the impact test rig to measure the dynamic stiffness and damping coefficient of air foil bearing for high speed rotor is presented in this study. The stiffness and damping coefficient of air foil bearing depending on the rotational speed can be measured easily and effectively by using the simple configuration of impact test rig which is composed of air gun, gap sensors and high speed motor. The estimation results of stiffness and dampling coefficient using least square estimation method is presented as well.

가변 풍력발전 시스템의 최대출력 제어를 위한 Fuzzy 제어기 설계 (A Fuzzy Logic Controller Design for Maximum Power Extraction of Variable Speed Wind Energy Conversion System)

  • 김재곤;허욱열;김병륜
    • 대한전기학회논문지:시스템및제어부문D
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    • 제53권11호
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    • pp.753-759
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    • 2004
  • This paper presents a modeling and simulation of a fuzzy controller for maximum power extraction of a grid-connected wind energy conversion system with a link of a rectifier and an inverter. It discusses the maximum power control algorithm for a wind turbine and proposes, in a graphical form, the relationships of wind turbine output, rotor speed, power coefficient, tip-speed ratio with wind speed when the wind turbine is operated under the maximum power control. The control objective is to always extract maximum power from wind and transfer the power to the utility by controlling both the pitch angle of the wind turbine blades and the inverter firing angle. Pitch control method is mechanically complicated, but the control performance is better than that of the stall regulation method. The simulation results performed on MATLAB will show the variation of generator's rotor angle and rotor speed, pitch angle, and generator output.

전압주입 방식을 이용한 PMSM 센서리스 제어에 관한 연구 (Sensorless control of PMSM in low speed range using high frequency voltage injection)

  • 윤석채;김장목
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2003년도 추계학술대회 논문집
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    • pp.119-122
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    • 2003
  • This paper describes the sensorless technique for the surface-mounted permanent-magent synchronous motor(SPMSM or PMSM) drive based on magnetic saliency. The control technique is a sensorless control algorithm that injects the high frequency voltage to the stator terminal in order to estimate the rotor position and speed. The rotor position and speed for sensorless vector control is achieved by appropriate signal processing to extract the position information from the stator current in the low speed range including zero speed. Proposed sensorless algorithm using the double-band hysteresis controller and initial rotor position detection exhibits excellent reference tracking and increased robustness. Experimental results are presented to verify the feasibility of the proposed control schemes.

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