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Analysis of magnetic bearing using inductive levitation by relative motion between magnet and conductor
Author(s) -
Takanashi Takeshi,
Matsuya Yuji,
Ohtsuka Yusuke,
Nishikawa Masahiro
Publication year - 2009
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.20652
Subject(s) - conductor , levitation , magnetic bearing , bearing (navigation) , finite element method , rotor (electric) , magnet , eddy current , mechanics , materials science , mechanical engineering , engineering , structural engineering , physics , electrical engineering , composite material , astronomy
In chemical plants, an anticorrosion magnetic drive pump is commonly used to deliver corrosive chemical liquids because of its high anticorrosion performance. However, when bubbles enter the chemical pump and accumulate between the shaft and the bearing, the shaft is often broken by thermal shock. The magnetic bearing which holds the rotor in noncontact has the advantage of avoiding thermal shock and keeping the rotor in a stable state by restoring force induced from the eddy current in the conductor. A model of magnetic bearing was analyzed using the three‐dimensional finite element method. In this model, a restoring force of 68.6 N and a braking torque of 8.7 N‐m were found. The locus of the rotation axis was also estimated using a radial load and a drag coefficient. The rotor may be located inside the movable range. ©2008 Wiley Periodicals, Inc. Electr Eng Jpn, 166(4): 80–87, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20652