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유도전동기의 폐루프 고피나스 자속 관측기를 이용한 전압 모델 자속 관측기의 구현
조권재(Gwon-Jae Jo),최종우(Jong-Woo Choi) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.10
Accurate estimation of rotor flux is very important to implement direct vector control of induction motors. In case that error of rotor parameters (such as rotor resistance and mutual inductance) of induction motors exists, voltage model among various flux observers shows superb performance because this observer is robust with respect to error of these parameters. However, it is difficult to realize the voltage model flux observer because of the effect of voltage offset which occurs from PWM inverter and by others. This paper proposes realization of the voltage model flux observer by using the conventional closed-loop Gopinath flux observer and analyzing of characteristic function of that.
벡터제어 유도전동기의 슬립 각속도를 이용한 회전자 저항 추정
박현수(Hyunsu Park),조권재(Gwon-Jae Jo),최종우(Jong-Woo Choi) 대한전기학회 2018 전기학회논문지 Vol.67 No.10
Accurate tuning of parameter is very important in vector-controlled induction motor. Among the parameters of induction motor, detuning of rotor resistance used in controller design deteriorates drive performance. This paper presents a novel rotor resistance estimation strategy using slip angular velocity in vector-controlled induction motor drives. The slip angular velocity can be calculated by two methods. Firstly, it can be induced from the rotor voltage equation. Secondly, it can be induced from the difference between synchronous angular velocity and rotor angular velocity. The first method includes the rotor resistance, while the second method dose not include this parameter. From this fact, the rotor resistance can be identified by comparing the slip angular velocities in the two methods. In the tuned states of the rotor resistance, performances of flux estimator and speed drive are discussed. The simulation and experimental results are given to verify the validity of the proposed method in various situations.