Comparative Analysis of Different Permanent Magnet Arrangements in a Novel Flux Modulated Electric Machine

Jiahui Huang,Weinong Fu,Xing Zhao,Shuangxia Niu

doi:10.1109/access.2021.3052545

Abstract

A novel dual permanent magnet (PM) machine with Halbach segmentation flux modulation is proposed in this paper, which is evolved from a flux switching PM machine (FSPM). In order to improve the performance of the FSPM, several PM arrangement methods have been adopted and three new different structures have been investigated. To achieve a fair comparison, all the structures are under the same size and rotate at the same speed. The performances of output torque and back EMF are compared. The analysis results show that the dual PM with Halbach segmentation has the highest torque density and power efficiency. The torque is improved by 100.3% from the FSPM while the PM volume does not increase too much. The unique of this best structure is that it not only combines the vernier machine and FSPM machine together, but also reduces the torque ripple. The performance of the motor is verified by the simulation using finite-element analysis (FEA).

Highlights

With the emergence and development of renewable energy and automation technology, electric machines have attracted more and more attention
The results show that the V-shaped permanent magnet (PM) arrangement
To reduce the torque ripple and asymmetric phase back-EMF caused by the consequent pole, different PM arrangements in rotors have been investigated and a hybrid pole structure has been proposed

Summary

INTRODUCTION

With the emergence and development of renewable energy and automation technology, electric machines have attracted more and more attention. These machines are based on the working principle of the novel magnetic gear proposed in [17] and the derivation from it. To further optimize the torque density, flux-modulated dual-PM-excited structures have been investigated. In [22], several dual-PM-excited motors have different stator structures with the same rotor are comparatively studied. J. Huang et al.: Comparative Analysis of Different PM Arrangements in a Novel Flux Modulated Electric Machine. To reduce the torque ripple and asymmetric phase back-EMF caused by the consequent pole, different PM arrangements in rotors have been investigated and a hybrid pole structure has been proposed.

MACHINE TOPOLOGIES

PERFORMANCE ANALYSIS

ANALYSIS OF DESIGN PARAMETERS

Findings

CONCLUSION