关键词: 永磁同步电机, 无传感器控制, 高频方波注入, 滑模观测器

Abstract: Aiming at the problems of control accuracy and response speed in sensorless control of embedded permanent magnet synchronous motor (PMSM) in full speed range, a high-performance hybrid control strategy was proposed to accurately obtain position information and rotor speed within a wide speed range. High frequency orthogonal-square wave injection was used to extract rotor position information through arctangent function in low speed domain, and high order sliding mode observer was used to estimate rotor velocity in medium and high speed domain. In order to realize smooth switching in wide speed domain, hysteresis algorithm was used to control the switching strategy. The simulation and experimentresults prove the feasibility and effectiveness of the hybrid control strategy.

Key words: permanent magnet synchronous motor(PMSM), sensorless control, high frequency square wave injection,sliding mode observer(SMO)