The Research of PMSM Rotor Position Detection Based on Compound Algorithm

In condition of there is not rotor position detection method for full speed in the study of PMSM sensorless control, this paper tries a kind of compound algorithm by dividing the high speed and low speed into different section, to inject high frequency in low speed, detect the current signal and get the rotor position. The sliding mode observer designed in high speed to detect BEMF and get the rotor position. To extract the synthetic speed through the integral operation by weighted algorithm within switched interval. This method has advantages of insensitive to motor parameters variation, self-adaption of frequency and amplitude and fast response speed and some others, the correctness and feasibility of this method was verified through the simulation in MATLAB/SIMULINK environment.