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In-situ magnetization of NdFeB magnets for permanent magnet machines

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3 Author(s)
Liuchen Chang ; Dept. of Electr. Eng., Queen''s Univ., Kingston, Ont., Canada ; Eastham, T.R. ; Dawson, Graham E.

In-situ magnetizers are needed to facilitate the assembly of permanent magnet machines and to remagnetize the magnets after weakening due to a fault condition. The air-core magnetizer in association with the silicon steel lamination structure of the rotor has advantages over its iron-core counterpart. This method has been used to magnetize the NdFeB magnets in a 30-hp permanent magnet synchronous motor. The magnetizing capability for different magnetizer geometries was investigated for the magnetization of NdFeB material. The design, testing, and operation of this magnetizer are reported.

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 5 )