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Self‐sensing active magnetic bearings with zero‐bias‐current control
Author(s) -
Kato Yuki,
Yoshida Toshiya,
Ohniwa Katsumi
Publication year - 2008
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.20616
Subject(s) - magnetic bearing , electromagnet , rotor (electric) , control theory (sociology) , magnetic levitation , position (finance) , linearity , controller (irrigation) , digital control , engineering , signal (programming language) , magnet , current (fluid) , digital signal processing , position sensor , nonlinear system , electrical engineering , physics , computer science , control (management) , artificial intelligence , agronomy , finance , biology , economics , programming language , quantum mechanics
A zero‐bias‐current self‐sensing active magnetic bearing is proposed. One degree‐of‐freedom (DOF) of the rotor is controlled by a pair of electromagnets which are alternatively energized by the proposed circuit. The rotor position of the one DOF is measured by using both electromagnets: the nonenergized electromagnet also contributes to the position sensing. The proposed method gives good linearity in the position estimation. The controller of the magnetic levitation consists of a digital signal processor, DSP, which compensates the nonlinearity of the magnetic force and achieves good damping. In the experiment, the rotor can run at 45,000 min ‐1 . © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 165(2): 69–76, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20616
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