Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Work or object holding type
Patent
1998-04-13
1999-12-14
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Work or object holding type
335291, 335285, H01F 720
Patent
active
060023171
ABSTRACT:
In the switchable magnet system disclosed herein, a central pole piece is backed by at least two permanent magnets having substantially different energies (H.sub.c) so that one of the magnets is relatively switchable or reversible and the other is not. A magnetically permeable frame provides a peripheral pole face at least on either side of the central pole face and a backing plate bridging the central pole piece over the permanent magnets. A coil surrounds the first and second permanent magnets inside of the peripheral pole face. According, energization of the coil in one direction can reverse the polarization of the first magnet, thereby effectively short circuiting flux produced by the second magnet and terminating holding, while energization of the coil in the opposite direction can polarize the first magnet in parallel with the second magnet, thereby to effect holding.
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Donovan Lincoln
Manus Peter J.
Pahl Jr. Henry D.
Walker Magnetics Group, Inc.
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