Dual Three-Phase Winding Topology Design and Electromagnetic Performance Optimization of PMSM for Electrified Underwater Propulsion Equipment

Abstract

Facing strict requirements on reliability, power density, vibration and noise for electrified underwater propulsion (EUP) drive motors, this paper investigates dual three-phase winding selection and structural parameter multi-objective optimization of a 24-slot/22-pole surface-mounted permanent magnet (PM) synchronous motor (PMSM). According to winding function theory and magnetomotive force (MMF) harmonic analysis under normal and faulty operation, a double-layer 30° phase-shifted (DL30°) winding is chosen, which is proven to boost torque output and attenuate torque ripple via finite-element (FE) analysis. Key dimensions are globally optimized by the multi-objective particle swarm optimization algorithm, yielding a 5.36% torque density rise and a 41.46% reduction in torque ripple. Prototype experiments agree well with simulations and validate the design strategy.