关键词: 永磁同步电机, 电磁力密度, 高频注入, 无位置传感器控制

Abstract: The sensorless control based on pulsating high-frequency( HF) injection will cause the permanent magnet synchronous motor to generate additional HF electromagnetic force,which will aggravate the vibration of the motor. Aiming at this problem, this paper proposes a variable angle HF voltage injection sensorless control method, which reduces the radial electromagnetic force generated by HF voltage by changing the voltage injection angle, thereby weakening the motor vibration. The space-time characteristics of the radial electromagnetic force wave of the motor under HF injection are analyzed by analytical method and finite element method. The relationship between the voltage injection angle and the amplitude of the HF electromagnetic force density is derived. The corresponding demodulation method of the rotor position estimation error under variable angle injection is illustrated. The experimental results show that changing the injection angle can effectively reduce the electromagnetic vibration caused by HF injection.

Key words: permanent magnet synchronous motor, electromagnetic force density, high frequency injection, senseless control