Control method and control system of permanent magnet synchronous motor based on speed feedback frequency conversion tracking

The invention discloses a permanent magnet synchronous motor control method and system based on speed feedback frequency conversion tracking, and relates to the field of permanent magnet synchronous motor control. The invention aims to solve the problem of low estimation precision in the control of a permanent magnet synchronous motor without a position sensor in the prior art. An estimated sine curve and an estimated cosine curve are obtained according to a phase voltage u alpha beta and a phase current i alpha beta of a motor and a feedback angular velocity estimated value; an angular velocity estimated value and a position angle estimated value of a rotor are obtained according to the estimated sine curve and the estimated cosine curve; a driving signal is obtained according to the angular velocity estimated value and the position angle estimated value; the method reduces the current error, improves the estimation precision, and achieves the stable operation of the permanent magnet synchronous motor. 基于速度反