Fault‐Tolerant Control and Torque Ripple Mitigation in a Modular Six‐Phase, Non‐Sinusoidal PMSM Drive With Dual‐Stator Windings

ABSTRACT This paper addresses fault‐tolerant control (FTC) in a six‐phase permanent magnet synchronous motor (PMSM) with a dual stator winding. Each motor phase comprises two windings symmetrically positioned relative to the stator center. To enhance drive reliability, a modular architecture is adopted for both the stator and the drive system. In this design, each stator winding is independently powered by a dedicated single‐phase H‐bridge inverter, with individual microcontrollers governing the inverters of each phase. To mitigate harmonic distortions in the phase back‐EMFs and minimize torque ripple, the study proposes an optimized harmonic current injection method, complemented by quasi‐proportional‐resonant (QPR) current controllers for precise tracking of harmonic reference currents. In the event of a phase failure, torque oscillations inevitably arise. To suppress these oscillations, a FTC strategy is employed, which eliminates the second‐order harmonic components of the electromagnetic torque generated by the remaining healthy windings. The effectiveness of the proposed control system is validated through software simulations under various fault scenario. Additionally, experimental results are provided to corroborate the theoretical framework and simulation outcomes.This paper deals with the control of a specific PMSM that can be used for electric transportation. The design of the motor and drive is completely modular and in each fault scenario, torque can be produced.