Research on Control Strategy of Diode Clamped Three-Level 12-Phase Permanent Magnet Synchronous Motor

Based on the mathematical model of multiphase permanent magnet synchronous motor, it can be summarized as single winding model and multi winding models in MT coordinate system. On this basis, this paper studies the speed regulation method of diode neutral point clamped (NPC) three-level twelve-phase permanent magnet synchronous motor (PMSM), and designs and implements multi-phase vector and multi-phase multi-vector speed control strategies. Three-level converter adopts space voltage vector pulse width modulation (SVPWM) technology; a diode clamped three-level twelve phase inverter is constructed, and a multi-phase vector control strategy of air gap flux-oriented control of twelve-phase permanent magnet synchronous motor is realized by using the linear auto disturbance rejection control (ADRC) method. On this basis, the operation of the motor under phase failure is analyzed and verified. The simulation results show that the system can achieve good control and operation performance by adopting the speed regulation strategy described in this paper.