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Fractional-slot PM machines have several advantages, but they suffer from the high contents of space harmonics in the air-gap MMF distribution. The MMF space harmonic amplitude and frequency depend on the particular combination of number of slots and poles. Such harmonics induce losses in the rotor since they are not synchronous with the rotor speed. This paper compares two kind of machines with the...
In spite of their several advantages, the fractional-slot PM machines suffer high contents of space harmonics in the air-gap MMF distribution. The MMF space harmonic amplitude and frequency depend on the particular combination of number of slots and poles. The main consequence of such harmonic contents is the induced losses in the rotor. Moreover the slot opening can produce considerable rotor losses...
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