Torque Ripple Reduction of Consequent-pole Permanent Magnet Machine by Shaped Rotor

In this paper, the sinusoidal + third (Sin+3rd) harmonic shaped PM is used to suppress the high torque ripple of consequent-pole machine (CPM). This paper will introduce the general development status of CPM machine and the research actuality of torque ripple of CPM machine. The parameters of conventional CPM machine and Sin+3rd shaped CPM machine will be optimized by 2D finite element analysis. Moreover, the optimal results of air-gap magnetic flux density, cogging torque, torque waveform of different machines will be compared and analyzed in this paper. The results show that the PMs adopting Sin+3rd shaping can reduce the torque ripple of CPM machine and further improve the utilization ratio of rare earth PM material.