역기전력 추정 방식 센서리스 제어를 이용하는 IPMSM의 기동특성 개선

Abstract

This study is improvement of start-up characteristic of IPMSM using back EMF estimation based sensorless control. In this paper using method is SMO(Sliding Mode Observer) that is an one among of back EMF estimation based sensorless control. Sliding Mode control is useful to variable system such as motor control system, because the system's parameters are variable according surround condition. Sensorless algorithm using SMO needs back EMF. So, This method is difficult to apply when the motor speed is low. In order to solve this problem, the high frequency injection method was have been study. But, This method needs complex calculations, and is difficult for realization. Thus, this method is not used widely in industry applications. Widely utilized method is the synchronous acceleration one. In this method, the rotating magnetic field is generated for synchronous acceleration during open loop control period. However, the responses of speed and current are varied according to load condition. This brings to overshoot in speed response and undershoot in current response. In this paper a method employing another controller to solve the problem is presented. Simulation and experimental results are presented to verify proposed method.