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Effect of Pole to Slot Ratio on Cogging Torque and EMF Waveform in Permanent Magnet Motor with Fractional-Slot  

Lee, Kab-Jae (한양대 공대 전기공학과)
Lee, Ju (한양대 공대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers B / v.52, no.9, 2003 , pp. 454-459 More about this Journal
Abstract
Conventional integral-slot design in permanent magnet(PM) motor tends to have a high cogging torque and large end turns, which contribute to copper losses. The fractional-slot design is effective compared to integral-slot design in the cogging torque and electromotive force(EMF) waveform. The effectiveness of fractional slot can be maximized by selecting optimal pole to slot ratio. This paper presents the effect of pole to slot ratio on the cogging torque and EMF waveform in the PM motor with fractional-slot. The effectiveness of the proposed designs has been confirmed by comparing waveform of EMF. cogging torque and torque ripple between conventional and new models.
Keywords
Permanent Magnet Motor; Pole to Slot Ratio; Cogging Torque; EMF; Fractional-Slot;
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