Study of Control for Position Sensorless and Motor Current Sensorless Permanent Magnet Synchronous Motor Drives

Abstract

A vector control system is proposed for sensorless permanent magnet synchronous motor (PMSM) drives. In order to realize a simple and low-cost control system, the position sensor and current sensor are eliminated, and the motor current is detected from the direct current using the A/D converter of a microcomputer. When the direct current cannot be detected, the motor current is reversely converted from the current value of the dq axis. Finally, the effectiveness of the proposed control is verified by experiments using a salient pole PMSM.