A Consequent Pole Flux Reversal Machine With Asymmetric V-PM Structure for High Torque Performance Applications

Abstract

Conventional flux reversal machines (FRMs) are limited in torque density due to large pole flux leakage, while the inherently doubly salient structure results in a large torque ripple. In order to enhance the torque performance, a consequent pole FRM (CP-FRM) with asymmetric V-shaped permanent magnet (PM) structure (AV-CPFRM) is proposed in this article. The pole flux leakage of the AV-CPFRM is reduced by utilizing the flux focus effect of the V-shaped magnets in conjunction with the CP structure, while the torque ripple is reduced by adopting the asymmetric pole structure. Subsequently, the AV-CPFRM is optimized and analyzed, and the influence of the torque performance on the asymmetric pole structure parameters is investigated. In addition, the electromagnetic performance of the optimized AV-CPFRM is compared with CP-FRM and CP-FRM with V-shaped (V-CPFRM) magnets based on finite-element analysis (FEA). The results suggest that the AV-CPFRM reduces torque ripple by 86.6% with an average torque increase of 11% compared to the conventional CP-FRM. Finally, the AV-CPFRM prototype is constructed and experimented.