IPMSM 센서리스 제어에서 회전자 초기 위치 추정

Abstract

In this paper, an improved estimating method for initial rotor position in sensorless control of IPMSM (Interior Permanent Magnet Synchronous Motor) is proposed. Experimental results are presented to verify proposed method. In this paper, the improved method uses a voltage pulse. It is based on the principle of the variation of inductance caused by the magnetic saturation. It is a merit of this method that it can be implemented without additional input signal. Also, this method remains unaffected by electric motor constant, because the initial position of the rotor can be estimated by comparing the magnitude of current responses on the space voltage vector in each phase. Conclusively, it can estimate d-axis position with the interval of 30 degrees to compare the current response obtained from given space voltage vector. The response time with this method is faster than conventional methods. In order to show the usefulness of the proposed estimation method, the experiment results are presented.