Research on torque ripple suppression of in-wheel fractional slot permanent magnet synchronous motors based on auxiliary slots

Abstract

Abstract To address the issue of significant torque ripple in in-wheel fractional slot motors, a method involving the introduction of stator auxiliary slots is employed to weaken cogging torque and reduce vibration and noise generated during motor operation. Through analysis of cogging torque, the impact of the size, spacing, and quantity of auxiliary slots on torque performance is investigated. When four appropriately parameterized auxiliary slots are introduced, the cogging torque decreases from 7.81 Nm to 2.38 Nm, a reduction of 69.53%. Underrated conditions, the output torque increases from 131.84 Nm to 137.32 Nm, and the ripple of torque decreases from 14.87% to 6.97%. Thus, the motor’s torque performance is significantly improved.