회전자 위치센서 없는 영구자석 동기전동기의 운전에 관한 연구

Abstract

This paper introduces the study on the operation of sensorless permanent magnet synchronous motor(PMSM). Sensorless control is required because there is no rotor position sensor currently used. Among the existing sensorless algorithms, we applied position information estimation using estimated extended electromotive force(EMF). The motor used specific purpose can be rotated by the external environment. Speed information is indispensable to driving the motor that is rotated by the external environment. The speed level is determined as the maximum value of the counter electromotive force through counter EMF sensing. At high speed(900 rpm ~ 2,400 rpm), the period of the counter electromotive force is read and calculated in terms of speed. At low speed(100rpm ~ 900rpm), phase current is read and the speed is calculated. And restarts the motor based on the calculated speed information and position information. Below 100 rpm, the motor is stopped and the motor is driven through alignment and synchronous acceleration. The time required to stop the motor depends on the maximum value of the phase current. The sensorless control algorithm was confirmed through simulation. It was verified through experiment that it is applied to the control algorithm and driven at the rated speed of 2,400 rpm. The proposed restarting method proves its effect through experimental results.