Winding Factors and Magnetic Fields in Permanent-Magnet Brushless Machines With Concentrated Windings and Modular Stator Cores

Greg Heins, Dan M. Ionel, Mark Thiele

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Removing some sections of the stator yoke in a permanent-magnet brushless machine can be beneficial for reducing punching waste and simplifying motor manufacture. However, in some cases, restricting the possible flux paths, in this way, will have a detrimental impact on the torque and air-gap harmonics. This paper discusses the potential implications of modular stator core arrangements and presents the air-gap flux density harmonics and winding factors for potential slot/pole combinations. Finite-element analysis (FEA) simulations are presented to support the analytical calculations. The analysis indicates that the performance reduction from using a modular stator is minimal when the number of slots and poles are similar but drops off substantially when this is not the case. A modular core stator will increase the MMF subharmonics due to the magnet field but can reduce the subharmonics due to the armature if a single-layer winding is used. The effect of slotting is very similar for a modular and conventional core machine, and FEA results match previously published analytical analyses.

Original languageEnglish
Article number07017551
Pages (from-to)2924-2932
Number of pages9
JournalIEEE Transactions on Industry Applications
Volume51
Issue number4
DOIs
StatePublished - Jul 1 2015

Keywords

  • Analytical models
  • brushless machines
  • electromagnetic fields
  • electromagnetic modeling
  • magnetic losses
  • manufacturing
  • permanent-magnet machines

ASJC Scopus subject areas

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

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