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Clamp assembly including permanent magnets and coils for selectively magnetizing and demagnetizing the magnets

  • US 8,912,872 B2
  • Filed: 04/30/2012
  • Issued: 12/16/2014
  • Est. Priority Date: 04/30/2012
  • Status: Active Grant
First Claim
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1. A clamp assembly for clamping a stack having a first surface and a second surface, the clamp assembly comprising:

  • a first clamp including a plurality of magnet devices, each magnet device including a permanent magnet and a coil surrounding the permanent magnet;

    a controller for pulsing the coils to selectively magnetize and demagnetize the permanent magnets; and

    a second clamp generally opposite the first clamp that forms an air gap with at least one of the permanent magnets of the first clamp, the second clamp providing a flux path between at least two of the plurality of magnet devices,wherein the first clamp is configured to be positioned against the first surface of the stack;

    wherein the second clamp is configured to be positioned against the second surface of the stack; and

    wherein the air gap is configured to receive the stack.

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