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Torque and suspension force in a bearingless switched reluctance motor
Author(s) -
Takemoto Masatsugu,
Chiba Akira,
Akagi Hirofumi,
Fukao Tadashi
Publication year - 2006
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20157
Subject(s) - switched reluctance motor , control theory (sociology) , stator , suspension (topology) , permeance , rotor (electric) , electromagnetic suspension , torque , reluctance motor , electromagnetic coil , magnetic reluctance , engineering , physics , mechanical engineering , computer science , magnet , mathematics , electrical engineering , membrane , control (management) , permeation , artificial intelligence , homotopy , biology , pure mathematics , genetics , thermodynamics
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 formulas of instantaneous torque and suspension force are necessary to a rotational speed controller and a rotor radial position controller. This paper derives the theoretical formulas 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 formulas are very accurate in terms of practical application. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 157(2): 72–82, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20157