Assessment of torque components in brushless permanent-magnet machines through numerical analysis of the electromagnetic field

Dan M. Ionel, Mircea Popescu, Malcolm I. McGilp, T. J.E. Miller, Stephen J. Dellinger

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

For the calculation of torque in brushless (BL) alternating current motors a local method is proposed, based on the Maxwell stress theory and the filtered contributions due to the harmonics of the magnetic vector potential in the motor air gap. By considering the space fundamental field only, the method can efficiently estimate the average synchronous torque for a variety or motor topologies, including concentrated winding designs. For BL direct current motor analysis a global method is introduced, based on the virtual work principle expressed in terms of energy components in various motor regions. The method leads to simplifications in the average torque calculation and enables the direct identification of the cogging and ripple components. The mathematical procedures have been validated against experiments and other numerical techniques.

Original languageEnglish
Pages (from-to)1149-1158
Number of pages10
JournalIEEE Transactions on Industry Applications
Volume41
Issue number5
DOIs
StatePublished - Sep 2005

Keywords

  • Brushless (BL) permanent-magnet (PM) motor
  • Cogging torque
  • Electric machine simulation
  • Finite-element analysis (FEA)
  • Ripple torque
  • Synchronous machine

ASJC Scopus subject areas

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

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