In this paper, a switch duty cycle (SDC) based model predictive control (MPC) strategy is proposed for the hybrid-inverter driven open-winding permanent magnet synchronous motor (HI-OW-PMSM) system. The voltage equation of OW-PMSM, PI controller and power distribution method are combined with switch duty cycle. Then, the conventional cost function is transformed into only switch duty cycle constraint, thus the weighting factors are eliminated. Besides, the duty cycle of each switch device is calculated directly, which realizes the multi-vector MPC in the HI-OW-PMSM system without iterative or modulated process for voltage vector. Experimental results show that the proposed method has stable static performance, fast response speed and simple control process.

Open winding permanent magnet synchronous motor (OW-PMSM); Model predictive control (MPC); Switch duty cycle (SDC)