Low Cost High Torque Density Dual-Stator Permanent Magnet Vernier Machine

Abstract

Permanent magnet vernier machines (PMVMs) have some distinct advantages of high torque density and low torque ripple at low speed [1]. Due to these advantages, they have been extensively researched and proposed for wind power generation [2] and wave energy conversion [3]. To increase the torque density of a PMVM, a novel dual stator vernier topology was presented recently [4], which possessed higher torque density and higher efficiency compared to a conventional vernier machine. However, PMVM generally have high permanent magnet (PM) pole pairs, which increases the cost of the machine. For simplicity, the recently presented machine will be termed as existing machine in this paper. In this paper, in order to further increase the torque density and decrease the cost of the existing machine, a dual stator consequent pole vernier machine has been proposed. The results show that the proposed machine provides a higher torque density compared to the existing machine. Moreover, the cost of the machine is also low since magnet volume has been decreased.