Ultrafast Steady-State Multiphysics Model for PM and Synchronous Reluctance Machines

Yi Wang, Dan M. Ionel, David Staton

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


A new technique for coupling the electromagnetic, thermal, and airflow analysis is proposed particularly for electric machines that exhibit reduced dependence of core losses with temperature and load and have low rotor losses. Within the overall iterative loop, another inner loop that cycles only the thermal calculations and employs a simplified model to estimate losses is introduced. The thermal and airflow analysis models the conduction, radiation, and convection heat transfer and is based on equivalent circuit networks. A computationally efficient finite-element (FE) technique is employed for the electromagnetic field analysis. The combination of algorithms results in ultrafast processing as the number of outer loop iterations, which include electromagnetic FE analysis, is minimized. The overall computational time is significantly reduced in comparison with the conventional method, such that the new technique is highly suitable for large-scale optimization studies. Example simulation studies and measurements from an integral horsepower interior permanent-magnet motor are included to support validation.

Original languageEnglish
Article number7080858
Pages (from-to)3639-3646
Number of pages8
JournalIEEE Transactions on Industry Applications
Issue number5
StatePublished - Sep 1 2015

Bibliographical note

Publisher Copyright:
© 1972-2012 IEEE.


  • air-flow problem
  • coupled electromagnetic
  • design optimization
  • electric machine
  • electromagnetic finite element analysis
  • equivalent thermal network
  • multi-physics analysis
  • thermal

ASJC Scopus subject areas

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


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