Finite Position Set-Based Fast Position Estimation Method for High-Speed Permanent Magnet Synchronous Motor

The fast position estimation method of high-speed permanent magnet synchronous motor (HSPMSM) is studied in this paper. A phase locked loop structure based on stator current is proposed. In this structure, the idea of finite set model predictive control is introduced, and the position plane is divided into eight regions where the d axis current is monotonic. The absolute value of d-axis current error is taken as the cost function. According to currents polarity, the position region is selected and discretized into finite control variables. Rolling optimization is carried out on the control variables to finally get the estimated position. It need not the extra position polarity judgment method and can reduce the calculation amount on the premise of ensuring the accuracy of the estimated position, which is more conducive to the digital realization of HSPMSM sensorless control.