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Torque ripple suppression in surface mounted PMSMs with distributed windings

This paper examines the torque ripple variation of surface mounted PMSMs with distributed windings and large number of slots per pole. The effect of established cogging torque reduction methods such as magnet step skewing, stator dummy slots and magnet pole shaping on the torque ripple variations and magnetic flux production is investigated, as these methods address the same factors that influence torque ripple. Finite element analysis is performed in order to obtain the torque ripple and air-gap flux density waveforms. The effect of each applied method on the machines torque production and peak-to-peak variations are also presented. Magnet pole skewing method appears to be most effective when taking into consideration both torque ripple suppression and torque production.