A Novel 24-Slot/10-Pole Dual Three-Phase Fractional-Slot Overlapped Winding for Low Non-Working Space Harmonics and Stator Modularization

Abstract

This paper proposes a novel 24-slot/10-pole dual three-phase (DTP) fractional-slot overlapped winding, which can simultaneously achieve the goals of low non-working space harmonics and stator modularization. Moreover, the proposed winding inherits the majority of the merits of conventional fractional-slot concentrated winding (FSCW), such as low cogging torque, low torque ripple and short end-windings. The winding configuration of the proposal is described first, and then its magnetomotive force (MMF) analysis is conducted to calculate the winding factors by using the star of slots. According to the theoretical analysis, the harmonic reduction mechanism of the proposal is expounded in depth. In addition, a specific case of a permanent magnet synchronous machine (PMSM) equipped with the proposal is analyzed and compared with two PMSMs equipped with DTP-FSCW and two-slot-pitch fractional-slot winding (TSP-FSW) respectively by finite element method (FEM) in terms of no-load back electromotive force (EMF), cogging torque, armature reaction field, on-load torque, efficiency, and fault tolerance. A prototype with the proposed winding is built and tested to verify the theoretical analysis and numerical simulations.

Keywords

• Fractional-slot winding
• modularization
• permanent magnet synchronous machine
• space harmonic