A Predictive Torque Control Method for Dual Three-Phase Permanent Magnet Synchronous Motor without Weighting Factor

Abstract

In order to solve the problem of the difficult design of weighting factor for model predictive torque control (MPTC) of dual three-phase permanent magnet synchronous motor (DT-PMSM), this paper proposes a MPTC strategy without weighting factor. Firstly, the virtual voltage vector (V3) is introduced to reduce the harmonic currents. Secondly, an approximate alternative principle for predicted current is proposed, which simplifies the dual-vector prediction model and decreases the complexity of the prediction model. The control set at ( k+1 )th is selected by judging the change in torque and the position of the stator flux, which reduces the number of candidate voltage vectors. Thirdly, the cost function is selected according to the system state at two adjacent moments. The cost function separates the electromagnetic torque and the stator flux, and eliminates the weighting factor. Decreasing the complexity of the prediction model, reducing the number of candidate voltage vectors, the combination of the two methods in this paper can significantly reduce the computational burden of the CPU. Finally, experiments verify the effectiveness of the proposed method. The results show that the proposed method greatly reduces the calculation burden of the system under the performance of electromagnetic torque does not change much.