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In direct-drive systems that require high torque density and low-speed control, some applications need permanent magnet synchronous motors (PMSMs) to operate under continuous stall conditions. This operational mode causes a significant local temperature rise due to the uneven distribution of winding losses. This paper investigates the effect of pole/slot combinations and winding configurations on the temperature rise of fractional slot concentrated winding (FSCW) PMSMs. Four PMSMs with single-layer and double-layer windings in 18-slot/20-pole (18s/20p) and 24-slot/20-pole (24s/20p) FSCWs are first designed. Then, the loss distribution is calculated at different rotor stall positions. The finite element method (FEM) is used to investigate temperature distribution and thermal properties for four PMSMs under stall conditions. Results demonstrate the superior thermal performance of the 24s/20p double-layer winding under stall conditions. Finally, the proposed analysis is validated by experiments.

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Effect of Pole/Slot Combinations and Winding Configurations on Temperature Rise in Fractional Slot PMSM Under Stall Condition

  • 会议论文

  • 发表日期：

    2026年

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  • Mingchi Ge,
  • Bing Peng

摘要

In direct-drive systems that require high torque density and low-speed control, some applications need permanent magnet synchronous motors (PMSMs) to operate under continuous stall conditions. This operational mode causes a significant local temperature rise due to the uneven distribution of winding losses. This paper investigates the effect of pole/slot combinations and winding configurations on the temperature rise of fractional slot concentrated winding (FSCW) PMSMs. Four PMSMs with single-layer and double-layer windings in 18-slot/20-pole (18s/20p) and 24-slot/20-pole (24s/20p) FSCWs are first designed. Then, the loss distribution is calculated at different rotor stall positions. The finite element method (FEM) is used to investigate temperature distribution and thermal properties for four PMSMs under stall conditions. Results demonstrate the superior thermal performance of the 24s/20p double-layer winding under stall conditions. Finally, the proposed analysis is validated by experiments.