Design and development of efficient induction machine drive for reduced torque pulsations

Abstract

This paper presents a design philosophy to design an induction machine drive with minimized torque ripples. An induction motor model has been derived to incorporate the effect of machine design parameter as a ripple producing cause in the torque response. Harmonics in the flux density wave, due to distribution of winding around air gap periphery and due to slot permeance effect have been considered together and modeled as ripple producing cause in the torque response. Classical approach of induction machine modeling through mutual inductance calculation has been adopted. Large ripples have been identified in the torque response derived from model simulation. In order to minimize these torque ripples model has been subjected to a heuristic based optimization technique. Optimization for torque ripple minimization has suggested the new values for some of the design parameters. Next the feasibility condition for the design parameters have been checked and the optimized design parameters have been rounded off to the nearest feasible design values. Induction machine model response for the feasible design values has been determined through model simulation. Torque ripple has been reduced to a negligible value in the optimized machine model.