In attempt to further improve a constant power operation properties of an induction motor (IM), we have developed a six-phase pole change IM (six-phase PCIM). The six-phase PCIM can further expand a constant power operation range without increasing the volume and current of an IM. The pole change can be carried out smoothly without the torque fluctuation by the technique of controlling the currents of two modes (4-pole and 8-pole) independently. The characteristics of the proposed system are shown through the simulations and experimental results. Furthermore, the acceleration characteristics of the prototype electric vehicle (EV) mounted a six-phase PCIM is shown.
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