Abstract
This paper presents design, modelling and prototyping of three-phase permanent-magnet brushless machines having a fractional slot to pole ratio. In particular, permanent magnet brushless machines which exhibits slot number and pole number differ by either ±2 or ±1 will be considered. Such small difference in slot and pole numbers will potentially improve motor characteristics and subsequently result in better motor performance. Having fractional slot-pole number motors may also facilitate the deployment of double-layer windings or single-layer windings in order to simplify the manufacturing process. Finite-element methods are first used to predict the flux-linkage, back-emf and cogging torque waveforms, and they are shown to be in good agreement with the measured results. Two prototypes are built, the first motor has 12-slot/10-pole and the other motor has 9-slot/10-pole for test and validations. It is observed that the unity difference in 9-slot/10-pole motor would produce more trapezoidal phase back-emf waveform, hence, slightly higher average torque output with smaller torque ripples, in comparison with that found in 12-slot/10-pole motor.
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