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Permanent magnet synchronous motor is a nonlinear, multivariable, strong coupling system with uncertain external interference. In order to improve the accuracy of its speed control, the improved ADRC is used instead of the traditional ADRC. A new function is constructed by interpolation to replace the original optimal control function in ADRC, and the linear error feedback control rate is used to replace the nonlinear error feedback control rate, so as to reduce the difficulty of parameter adjustment. a position identification system based on pulse high frequency injection method and sliding mode observer method is established to meet the accuracy requirements of PMSM rotor position identification. The simulation results show that the improved ADRC can achieve better control effect in the positon sensorless control method. The error of rotor position estimation is less than 0.002rad, the error of speed estimation is less than 0.02rad/min, the speed overshoot is less than 4%, and the maximum oscillation is not more than 60rad/min. Compared with the traditional ADRC controller, the system has stronger anti disturbance performance, and the identification effect of motor position and speed is also better.