Permanent magnet reduction by current harmonics injection for surface permanent magnet machines

Daniele De Gaetano, Giacomo Sala, Michele Degano, Chris Gerada

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

Abstract

This paper presents the analysis of multi-harmonic current injection in multi-three phase surface permanent magnet (SPM) machines. An analytical model, extended to a generic harmonic order, is used to describe and determine the no load flux density, the back electromotive force (BEMF) and the electromagnetic torque produced. These are analysed as a function of the permanent magnet span. Based on the BEMF, the harmonics injection technique is adopted to increase the torque in the machine, while keeping the RMS current constant, thus without affecting the Joule losses. In order to understand how the torque is affected by the harmonics injection, considering different PMs rotor span, a comparison with and without injection is presented. It is shown how, thanks to specific harmonics injection, it is possible to reduce the permanent magnet content in SPM machines while generating the same torque performance of a motor with higher PM content, without harmonic injection. The analytical results are finally validated by means of Finite Element Analysis (FEA) considering two different PM rotor span, as a case study, highlighting the benefits of the proposed method.

Original languageEnglish
Title of host publicationProceedings - 2021 IEEE Workshop on Electrical Machines Design, Control and Diagnosis, WEMDCD 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages137-142
Number of pages6
ISBN (Electronic)9781728176154
DOIs
Publication statusPublished - 8 Apr 2021
Externally publishedYes
Event2021 IEEE Workshop on Electrical Machines Design, Control and Diagnosis, WEMDCD 2021 - Virtual, Modena, Italy
Duration: 8 Apr 20219 Apr 2021

Publication series

NameProceedings - 2021 IEEE Workshop on Electrical Machines Design, Control and Diagnosis, WEMDCD 2021

Conference

Conference2021 IEEE Workshop on Electrical Machines Design, Control and Diagnosis, WEMDCD 2021
Country/TerritoryItaly
CityVirtual, Modena
Period8/04/219/04/21

Keywords

  • Analytical models
  • Electric machines
  • Harmonic injection
  • Magnetic flux density
  • Multiphase machines
  • Permanent magnet machines
  • Rotating machines

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Safety, Risk, Reliability and Quality
  • Control and Optimization

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