Research on vector control and PWM technique of five-phase PMSM

The mathematic model that based on vector space for fivephase permanent magnet synchronous motor (PMSM) is established. The five-phase PMSM is designed with five sets of windings in Y-connected mode shifted by 72 electrical degrees. In the model, the variables of the motor are mapped to the α1-β1 fundamental subspace associated with the electromechanical energy conversion and α3-β3 third harmonic subspace. Different from six-phase PMSM, the five-phase model implies that the harmonic current in α3-β3 subspace have positive effect on electromechanical energy conversion. The vector control scheme for five-phase PMSM is presented, in which the currents in the subspace α1-β1 and α3-β3 are controlled in closed loop. A space vector pulse width modulation (SVPWM) algorithm of five-phase voltage-source inverter based on near two vectors is discussed. The voltage in α1-β1 and α3-β3 can be modulated simultaneously. Through the simulation and experiment analysis, the vector control method and PWM technique for five-phase PMSM are proved to be feasible and effective.