Super-multipolar permanent magnet reluctance generator designed for small-scale wind-turbine generation

Kenji Nakamura, Osamu Ichinokura

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


A permanent magnet reluctance generator (PMRG) has almost the same structure as a switched reluctance generator, but has permanent magnets in the stator yoke. Therefore, neither an exciting circuit nor a position sensor is required. This paper describes a super-multipolar PMRG for small-scale wind-turbine generation, which can be directly connected to the turbine without a gear box. The designed PMRG has two features for reducing torque ripple drastically; the first one is two-stacked structure that one rotor is shifted by 180° in electrical angle from the other rotor; the second one is that the rotor pole-tips are cut off. To find the optimum shape of the rotor pole-tip efficiently, the coupled analysis of finite element method and a general purpose optimization program is employed. In addition, load characteristics of the PMRG are indicated.

Original languageEnglish
Article number6332862
Pages (from-to)3311-3314
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 2012


  • Permanent magnet reluctance generator (PMRG)
  • Super-multipolar
  • Two-stacked structure
  • Wind-turbine generation

ASJC Scopus subject areas

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


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