Direct Torque Control of Five-phase Permanent Magnet Synchronous Motor Based on Model Prediction

Abstract

The five-phase permanent magnet synchronous (FP-PMSM) motor has many advantages such as small size, strong fault tolerance, low voltage and high power. But it is different from the three-phase permanent magnet synchronous motor (TP-PMSM), its unique xy subspace will produce larger current harmonics. Therefore, three-phase direct torque control (DTC) cannot be directly extended to five-phase systems. In order to suppress the current harmonics generated in the xy subspace, this paper analyzes the principle of DTC extended to the five-phase motor, and uses the traditional model prediction method, and proposes an improved model prediction method. This method reduces current harmonics and torque ripple by simplifying the voltage vector and optimizing the objective function. And the feasibility of theoretical analysis is verified by simulation results.