Electronic pole changing technique of multiphase induction motor based on vector control

Abstract

SUMMARY In order to extend the range of a constant-power operation regulation of the AC drive system, the electronic pole changing (EPC) technique for multiphase induction motor (IM) is proposed based on multiphase system transformation theory and the vector control (VC). This proposed technique can extremely expand a constant-power operation range without increasing the volume or current of an IM. The harmonic currents are generated in different orthogonal planes by VC to realize EPC without the poweroff. The EPC process is continuous and smooth, and the torque impulse is not obvious. An EPC experiment of a nine-phase IM is demonstrated in this paper. The experimental results verify that the proposed EPC technique has the ability to extend the operation range of multiphase IM. Copyright © 2012 John Wiley & Sons, Ltd.