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Skewing is one of the most widely used methods to reduce the torque ripples. However, it was reported that the on-load torque ripple was not always reduced by the conventional skewing, in which the skewing angle is one period of torque ripple. This paper proposes the way of improving the skewing to reduce the torque ripple when the conventional skewing fails. It is found that by optimizing the skewing...
This paper compares the torque densities, i.e. torque per volume (T/V) and torque per weight (T/G), between permanent magnet (PM) and electrically excited (EE) machines for low speed applications when they have the same overall size and copper loss. The machines are optimized individually and analytically. The optimal split ratio and flux density ratio are derived. The influence of pole number and...
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