Rotor initial position detection method based on fixed virtual axis high-frequency pulsating square wave injection

The invention discloses a rotor initial position detection method based on fixed virtual axis high-frequency pulsating square wave injection, which comprises a high-frequency pulsating square wave injection module, an electrical angle adjusting module of a motor, a detection module and an interval judgment module, and is characterized in that a pulsating square wave high-frequency voltage signal is injected into a d'axis of a virtual rotating coordinate system; the amplitude and frequency of the injected high-frequency voltage signal depend on the motor, and the q'axis injection voltage is 0. According to the method, the saturation salient pole effect of the motor is utilized, the rotor position of the hidden polarity motor can be detected, no filtering, no adjustable parameter and no complex calculation process exist, high-frequency signal injection enables the rotor to generate response current, response current values corresponding to different positions of the rotor are different, and therefore the respon