Sensorless control for hybrid motor
                                                                     CHEN Qian1, CHEN Minxiang1, WANG Zongpei2
(1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.Zhuhai Motion Control Motor Co., Ltd., Zhuhai 519000, China)

Abstract: Aiming at the limited usage of hybrid permanentmagnet synchronous motor in servocontrol applications, based on its structural features, the fluxweakening performance was analyzed, and the control strategies were summarized and studied. A sensorless control strategy was proposed which applies constant currentfrequency ratio control in its lowspeed range and uses stateobserver as the feedback for rotor position during the highspeed range, the experimental platform based on STM32 ARM CortexM4 MCU was set up, the closedloop control mode can be switched to when 20 percent of the base speed is reached, and the speed can be expanded to 4 times of the base speed, this verified the effectiveness of the control strategy. The results indicate that the hybrid permanentmagnet synchronous motor has excellent fluxweakening performance, and the sensorless control strategy can meet the performance requirements of the servo system with wide speed range on the basis of cost advantages. It expands the application range of the hybrid PMSM driving system.

Key words: hybrid permanentmagnet synchronous motor; sensorless control; fluxweakening performance