Abstract
Vernier permanent magnet (VPM) machines are obtaining more and more attentions due to their high torque density and low torque ripple feature. Owing to the “magnetic gearing effect,” VPM machines are capable of achieving high torque at low speed, which makes them suitable for direct-drive applications. However, they suffer from low power factor. In this paper, a triple-rotor axial-flux spoke-array vernier permanent magnet (TR-AFSAVPM) machine is proposed to enhance VPM machine power factor to a reasonable level and maintain their high torque density and adequate constant speed range. Both quasi-3-D finite element analysis (FEA) and 3-D-FEA are employed to investigate the proposed machine performances. Analysis results show that the TR-AFSAVPM machine has high power factor, viz. 0.94 and high torque density, viz. 22.87 kNm/m 3 .
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