Optimization of rotor of actual IPM motor using ON/OFF method

Norio Takahashi, Takaya Yamada, Satoshi Shimose, Daisuke Miyagi

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


For the design of an Interior Permanent Magnet (IPM) motor with small torque ripple and large driving torque, the optimal design method called the ON/OFF method is attractive, because a new magnetic circuit, which we could not imagined beforehand, may be obtained. In this paper, a non-parametric optimization technique to find a new magnetic circuit which minimizes a torque ripple and maximizes a driving torque of IPM motor is examined. The effectiveness of the ON/OFF method for the optimal design of a motor is examined by applying it to the design of the verification model of the IPM motor established by the technical committee of IEE of Japan. Factors affecting torque ripple and driving torque of the obtained optimal motor core are also discussed.

Original languageEnglish
Article number5754777
Pages (from-to)1262-1265
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number5
Publication statusPublished - 2011 May


  • Adjoint variable method
  • IPM motor
  • ON/OFF method
  • nodal force method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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