Unified calculation method for motor Torque in reluctance network analysis

Kenji Nakamura, Osamu Ichinokura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A reluctance network analysis (RNA), which is an improved magnetic circuit method, has some advantages: the analytical model is simple, the calculation accuracy is relatively high, and a coupled analysis with an electric circuit, a heat circuit, a motion equation, etc. is fundamentally easy. The RNA has been applied to the dynamic analysis of several motors such as a surface permanent magnet (SPM) motor, an interior permanent magnet (IPM) motor, and a switched reluctance (SR) motor. The dynamic characteristics of these motors including starting and a sudden load change can be calculated by an RNA. However, the torque calculation methods for these motors are different from each other. This paper presents a unified calculation method for the motor torque in an RNA, which does not depend on the types and structures of motors. The validity and availability of the proposed method are demonstrated by a finite element method (FEM) and an experiment.

Original languageEnglish
Pages (from-to)1063-1069
Number of pages7
JournalIEEJ Transactions on Industry Applications
Issue number11
Publication statusPublished - 2015 Nov 1


  • Interior permanent magnet (IPM) motor
  • Reluctance network analysis (RNA)
  • Surface permanent magnet (SPM) motor
  • Switched reluctance (SR) motor
  • Torque calculation method


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