Pole Changing Wide Speed Range Induction Motor Drive for Electric Vehicles

Abstract

The paper presents a two phase variable speed induction motor drive for wide speed application. The drive is designed to meet drive cycle requirements of Worldwide harmonized Light vehicles Test Procedure (WLTP). The required torque speed specifications of the induction machine are obtained from the drive cycle. The wide speed range operation of the drive obtained by pole changing technique. The proposed induction motor drive system consists of an online pole changing two phase induction motor which is driven using a four leg voltage source converter. Using the voltage source converter currents are controlled in certain coil groups of the machine to enable operation as two pole and four pole motor. The paper describes the windings configuration and operation of the two phase induction machine drive.