Research on Electromagnetism Torque of the Six-Phase Induction Machine with Special Phase Current Waveform

With the characteristic which the control of the multiphase machine is more complex compared with three-phase AC machine, a novel control method is proposed in this paper, namely six-phase motor trapezoidal wave phase current control. By using the trapezoidal phase current waveform, the stator winding is separated into the field winding and the torque winding. The function which is about the field and torque control in directed and separated mode can be realized without the complex Park transformation. The performance of the output torque of the six-phase induction motor using trapezoidal wave phase current is investigated in this paper. Three methods are used to verify the torque of the motor namely conventional analytical calculation, finite element calculation and practical measurements. K-value is analyzed and calculated as MMF decoupling. The result of the output torque obtained from these methods show good agreement.