Torque Ripple Analysis of Five-phase Induction Motor Drive with Pentacle Connected Stator Windings

This paper presents a method of analysis of torque ripple in a pulse width modulated five-phase induction motor (IM) drive whose windings are connected in pentacle mode. The proposed method is based on the notion of stator flux ripple. The torque ripple induced by switching harmonics in two distinct space vector PWM (SVPWM) techniques that utilize different sets of active vectors during the modulation process is investigated. The first PWM technique employs two large and two medium vectors, while the second technique employs four large vectors, in addition to zero vectors. The analyses demonstrate that, in a five-phase induction motor drive, the PWM method utilizing four large vectors generates higher torque ripple when compared to the method using two large and two medium vectors. The mathematical analysis is verified by simulation using the Matlab-Simulink software.