Optimal Configuration of Multiphase AC Motors Under Squarewave and PWM Operations

Abstract

In many applications such as electric vehicles, dual mode operation is needed. In the low speed region, PWM mode is chosen and squarewave mode is used for high speed region. In this paper, multiphase motor that is suitable for dual mode operation is investigated. Inverter input current ripple and rotor current ripple will be considered as the decision factors. This paper shows that nine-phase is suitable for such dual mode operation.