A control strategy of unified field permanent magnet dual mechanical port machine with spoke type PM arrangement

Spoke type Unified Field Dual Mechanical Port electric Machine (UFDMPM) is a novel type DMPM. Because of its unique electromagnetic coupling characteristic, the output torque of outer motor and inner motor will be affected by each other, so the traditional control method for DMPM is not very suitable for it. In this paper, a control strategy based on Space Vector Modulation Direct Torque Control (SVM-DTC) method is proposed to control the spoke type UFDMPM. The sufficient condition for direct torque control on spoke type UFDMPM is derived, and then the inner motor and outer motor can be separately controlled using SVM-DTC method, in spite of existing electromagnetic coupling between them. After improved the torque regulator by using an adjustable proportion coefficient, the control performance is improved. In the end, the control strategy is validated by simulations.