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간편한 2차저항 동정기능을 갖는 유도전동기의 센서리스 속도제어
이진국(Z. G. Lee),정석권(S. K. Jeong),유삼상(S. S. You) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The newly developed speed sensorless control scheme is proposed to estimate both motor speed and rotor resistance simultaneously using variable rotor flux. The rotor flux is given as sinusoidal waveform with appropriate amplitude and a frequency without affecting precise torque control. Especially the proposed method makes the simultaneous estimation of rotor resistance and speed with high precision even though at the low speed area including a few rpm. Moreover, on-line identification of rotor resistance can be performed simply without calculating troublesome trigonometric functions and complicated integral computation. Therefore, the proposed system can be accomplished by using very cheap microprocessors for several applications. The results of the numerical simulations and experiments demonstrate that this method is effective to estimate the speed and on-line identification of rotor resistance for sensorless induction motors.
가변 2차자속지령에 의한 유도전동기 속도센서리스 제어계의 2차저항 동정
이진국(Z. G. Lee),정석권(S. K. Jeong),유삼상(S. S. You) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, a new identification method of rotor resistance using variable rotor flux in speed sensorless control system for induction motors is presented. Simultaneous on-line estimations of speed and rotor resistance are realized based on a feedforward type torque control scheme. The rotor flux with a low frequency sinusoidal waveform is used to help the estimation. Since the proposed estimation does not depend on any derivative terms of currents and stator voltages. Therefore the proposed method can contribute to good speed sensorless control even though in a low speed region.