Operation principle and basic characteristics of VR magnetic gear

Hidenori Kato, Tatsuya Tonari, Michinari Fukuoka, Kenji Nakamura

Research output: Contribution to journalArticlepeer-review


A magnetic gear has advantages with respect to noise and maintainability, and the so-called PM (Permanent Magnet) magnetic gear has been studied, which consists of two magnet rotors and a ferromagnetic pole-piece rotor. In this study, we research a novel magnetic gear that we call a VR (Variable Reluctance) magnetic gear. It consists of a magnet rotor and two ferromagnetic pole-piece rotors to improve its performance. First, we describe the operating principle and compare the charactericstics of the VR magnetic gear with those of the PM magnetic gear by using a finite element analysis. Next, we prototype a VR magnetic gear and demonstrate its validity by experiment.

Original languageEnglish
Pages (from-to)1100-1106
Number of pages7
JournalIEEJ Transactions on Industry Applications
Issue number11
Publication statusPublished - 2015 Nov 1


  • Eddy current loss
  • Flux modulated type magnetic gear
  • Variable reluctance


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