Abstract
Tooth-tip local magnetic saturation can be significant in surface-mount PM (SPM) machines. In this paper, the influence of tooth-tip local magnetic saturation on the on-load iron and PM eddy current losses is comprehensively investigated in SPM machines having different slot/pole number combinations (Ns±2=2p, Ns±1=2p, Ns/2p=3/2 or 3/4, and Ns/2p=integer). It is found that due to the local magnetic saturation, the tooth-tip iron loss density is much higher than the iron loss density in the other stator parts. The tooth-tip iron loss density also remains high even under deep flux weakening operation. PM loss also can be high even when closed slots are employed. The fractional slot machines have higher iron and PM losses than the integer slot machines. Also the SPM machine will exhibit larger iron loss than the SPM machine having the same slot number but lower pole number.
Published Version
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