Torque and Suspension Force in a Bearingless Switched Reluctance Motor

Masatsugu Takemoto, Hirofumi Akagi, Akira Chiba, Tadashi Fukao

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. The bearingless switched reluctance motors are characterized by integration of switched reluctance motors and magnetic bearings. These motors have two kinds of stator windings composed of motor main windings and suspension windings in the same stator in order to produce suspension force that can realize rotor shaft suspension without mechanical contacts or lubrication. For successful stable operation, accurate theoretical formulae of instantaneous torque and suspension force are necessary to a rotational speed controller and a rotor radial position controller. This paper derives the theoretical formulae of the instantaneous torque and the suspension force from an assumption of simple permeance distribution. This derivation process makes an assumption that fringing fluxes are distributed on elliptical lines. It is shown with experimental results that the derived theoretical formulae are very accurate in terms of practical application.

Original languageEnglish
Pages (from-to)556-565
Number of pages10
Journalieej transactions on industry applications
Issue number6
Publication statusPublished - Sept 1 2004
Externally publishedYes


  • bearingless motors
  • magnetic suspension
  • permeance method
  • switched reluctance motors

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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