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Takahashi, Norio Okayama University
Suenaga, Ryousuke Okayama University
Miyata, Koji Shin-Etsu Chemical Corporation Limited
Ohashi, Ken Shin-Etsu Chemical Coporation Limited
The minor loops of B and H of steel due to pulse excitation and eddy currents induced in steel affect the magnetic characteristics of a permanent-magnet-type MRI. In this paper, the magnetic properties of a permanent magnet assembly is examined by using the finite-element method taking into account minor loop. The distribution of residual magnetization in the yoke is illustrated, and the effect of residual magnetization on the behavior of residual flux density is examined. It is shown that the behavior of B and H in minor loops is affected by the eddy currents in the yoke and pole piece.
finite element analysis
Digital Object Identifier: 10.1109/TMAG.2003.810510
Published with permission from the copyright holder. This is the institute's copy, as published in Magnetics, IEEE Transactions on, May 2003, Volume 39, Issue 3, Part 1, Pages 1337-1340.
Copyright © 2003 IEEE. All rights reserved.