Improved V-shaped interior permanent magnet rotor topology with inward-extended bridges for reduced torque ripple

Peng Gao, Xibin Sun, David Gerada, Chris Gerada, Xiaoyuan Wang

Research output: Journal PublicationArticlepeer-review

Abstract

Interior permanent magnet synchronous machines (IPMSMs) with V-shaped permanent magnet (PM) rotors are widely used as traction motors in electric vehicles because of their high torque density and high efficiency. However, the V-shape IPMSMs have the disadvantages of inevitable torque ripple due to the non-sinusoidal air-gap flux density distribution and the utilisation of the reluctance torque. In this study, with the aim of improving the torque ripple characteristics, a modified V-shaped IPMSM rotor configuration with bridges extended inwards towards the pole centre is proposed to generate a more sinusoidal air-gap flux density waveform. The proposed topology, referred to as 'Type C' within this study, is compared with baseline rotor configuration references, namely 'Type A' which is a conventional V-shaped PM rotor, as well as 'Type B' which is a related configuration with a mechanically non-uniform air gap. The analysis results show that the rotor 'Type C' exhibits significant advantages in terms of reducing cogging torque, torque ripple and radial force, without incurring additional air-gap friction losses. Finally, a prototype of the IPMSM with the proposed rotor configuration is manufactured and tested, verifying the predicted benefits experimentally.

Original languageEnglish
Pages (from-to)2404-2411
Number of pages8
JournalIET Electric Power Applications
Volume14
Issue number12
DOIs
Publication statusPublished - 1 Dec 2020
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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