Analysis of pulsating torque in squirrel cage induction machines by investigating stator slot and rotor bar dimensions for traction applications

The purpose of this paper is to analyze the pulsating torque in squirrel cage induction machines by studying the stator slot and rotor bar dimensions. To mitigate the pulsating torque produced by the non-sinusoidal spatial distribution of magnetomotive force (MMF) and permeance in the air-gap, design options are evaluated at various stator and rotor slot dimensions and operating conditions. Analytical and finite element analyses are conducted to evaluate the influences of changing slot dimensions to the output average and ripple torque. Design trade-offs are also discussed in the end.