Abstract: Aiming at the problems of slow starting speed, inaccurate starting torque control and large energy consumption in traditional starting method of scraper motor, this paper presents scraper starting method based on high frequency square wave voltage injection method with separation strategy of carrier signal without filter. By introducing the observer of rotor position and speed of permanent magnet motor, the precise starting torque control can be realized and the fast and smooth starting can be realized. The strategy of carrier signal separation without filter can avoid the use of filter in the traditional method of signal separation, thus improving the dynamic performance of the system.The simulation results show that the starting time and starting current of heavy load starting control strategy of scraper based on high-frequency voltage injection method are reduced by 52.3% and 75.0% compared with the traditional I/F starting method, which indicates that the starting performance of coal scraper is greatly improved.