Rotor Position Estimation of Permanent Magnet Synchronous Motor without Position Sensor Compound Control

In order to optimize the problem that a single method in the position sensorless control of permanent magnet synchronous motors is not suitable Ibr the full speed range, this paper proposes a position sensorless compound control strategy based on interior permanent magnet synchronous motor. The weighted switching Iiinction is used to combine the rotating high frequency voltage injection method with the sliding mode observer method, and a position sensorless composite control strategy model based on IPMSM is built through Matlab/Simulink, and simulation analysis is performed. The simulation results show that the proposed compound control strategy can improve the estimation accuracy of rotor position and speed in the full speed range, and use different methods to switch smoothly, and has good dynamic perldrinance and estimation accuracy.