VSP predictive torque control of PMSM

Abstract

This study applies the idea of variable switching point (VSP) to the predictive torque control (PTC) strategy for permanent magnet synchronous motor (PMSM) and proposes a new method to suppress the torque ripple of PMSM, without causing higher switching frequency. In this study, the head vector and tail vector act together in one control period. They form an infinite synthesised vector set based on VSP control. According to the distribution of all synthesised vectors and the position of expected voltage vector, the candidate VVs table containing duty ratio information is constructed off-line. By using the position information of expected voltage vector and the tail vector of the previous period, 3-5 candidate VVs in the table can be directly obtained, so the VSP predictive control can be realised without calculating the switching time online. The experimental results show that the proposed VSP-PTC can effectively suppress the torque ripple without causing high switching frequency.