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Magnetic suspension force in an induction bearingless motor with a squirrel cage rotor
Author(s) -
Katou Tatsuya,
Chiba Akira,
Fukao Tadashi
Publication year - 2007
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.20340
Subject(s) - squirrel cage rotor , induction motor , stator , suspension (topology) , rotor (electric) , control theory (sociology) , torque , electromagnetic coil , engineering , physics , computer science , mathematics , mechanical engineering , electrical engineering , voltage , control (management) , artificial intelligence , homotopy , pure mathematics , thermodynamics
Theoretical equations of magnetic force in an induction bearingless motor have been reported. In the bearing‐less motor, both 4‐pole and 2‐pole windings are stored in stator slots for torque and suspension force generation. In the analysis, squirrel cage rotor currents are considered. These currents are induced by both torque and suspension winding currents. Inductance matrix is represented by four sets of three‐phase windings, thus a 12×12 matrix is constructed. A simplification and reasonable assumptions are introduced to obtain understandable expressions for suspension force and torque representation. The rotor flux linkages in an induction bearingless motor are derived, and a simulation model of suspension force is then constructed. It is shown that the response and the phase of suspension force are delayed in the case of cage rotors. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 159(3): 77–87, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20340