Abstract: Aiming at dual power Open-winding Permanent Synchronous Motor (OW-PMSM) for electric vehicle, three winding modes, star mode, triangle mode and independent mode, and their implementation methods were proposed. A novel winding mode shifting strategy was put forward on the basis of discussing the working range of each winding mode, in which the torque saturation decision is insensitive to motor parameters. Also a multi-level current hysterisis modulation method was proposed, which could assign the main power source and change it anytime by additional electric levels and their trigger mechanism. Using this method the energy can be distributed between two power sources. The modulation method has two patterns, the low switching frequency pattern and the high power difference pattern, to achieve different energy distribution effects. Simulation results show that, the proposed method can take full advantage of the working range of each winding mode, reduce device loss and improve the effectiveness of the system, and provide theoretical basis and engineering proposal for designing the drive system of electric vehicle with dual power sources.

Key words: vehicle engineering, open-winding permanent magnet synchronous motor, winding mode shift, torque saturation decision, current hysterisis modulation, energy distribution