Abstract
This article investigates the post-demagnetization torque ripple of fractional-slot surface-mounted PM wind power generators. Firstly, the demagnetizing magnetomotive force from 3PSC currents is modelled and the demagnetization distribution pattern is analyzed. Then the post-demagnetization cogging torque is investigated. It shows that the cogging torque increases with demagnetization level. Afterwards, the post-demagnetization back-EMF and load torque ripple are analyzed. It is found that the demagnetization adds low-order harmonics in the back-EMF and leads to additional torque ripple component under the same stator current, which also increases with demagnetization level. Although the harmonic torque ripple offsets the cogging torque, it has smaller amplitude and thus the total torque ripple still increases with demagnetization level. Most importantly, the demagnetization distribution heavily depends on the 3PSC start rotor position.
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