An Overview of Methods and a New Three-Dimensional FEA and Analytical Hybrid Technique for Calculating AC Winding Losses in PM Machines

Narges Taran, Dan M. Ionel, Vandana Rallabandi, Greg Heins, Dean Patterson

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

This article proposes a new hybrid analytical and numerical finite element (FE) based method for calculating ac eddy current losses in wire windings and demonstrates its applicability for axial flux permanent magnet electric machines. The method takes into account three-dimensional (3-D) field effects in order to achieve accurate results and yet greatly reduce computational efforts. The new 3-D FE-based method is advantageous as it employs minimum simplifications and considers the end turns in the eddy current path, the magnetic flux density variation along the effective length of coils, and the field fringing and leakage, which ultimately increases the accuracy of simulations. This study is one of the first ones to compare meticulous 3-D finite element analysis (FEA) models with more approximate, but faster solution methods, which can be employed in the optimization process. The accuracy of the 3-D FEA calculations has been confirmed through tests on a prototype axial flux permanent magnet machine. The proposed method is applicable for cases with majority of ac copper losses induced due to external magnetic flux sources, such as permanent magnets. Examples of such machines designs are coreless or open slot PM machines with conductors sizes smaller than skin depth.

Original languageEnglish
Article number9242250
Pages (from-to)352-362
Number of pages11
JournalIEEE Transactions on Industry Applications
Volume57
Issue number1
DOIs
StatePublished - Jan 1 2021

Bibliographical note

Publisher Copyright:
© 1972-2012 IEEE.

Keywords

  • AC winding loss
  • PM machine
  • axial flux motor
  • eddy current loss
  • finite element (FE)
  • three-dimensional (3-D) model

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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