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Residual magnetic devices and methods

  • US 8,403,124 B2
  • Filed: 03/30/2005
  • Issued: 03/26/2013
  • Est. Priority Date: 03/30/2005
  • Status: Active Grant
First Claim
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1. A clutch for use in coupling a first element to a second element, the clutch comprising:

  • a core housing coupled to one of the first element and the second element;

    an armature positioned adjacent to the core housing, the armature coupled to one of the first element and the second element; and

    a coil positioned in the core housing, the coil receiving a magnetization current to create a substantially closed magnetic path including an air gap from approximately 0.002 inches to approximately 0.005 inches between the core housing and the armature in order to create an irreversible residual magnetic force with a magnetic air gap energy of at least 6652 (line-amp-turn)/cm3 and to couple the first element to the second element in the subsequent absence of the magnetization current and in the absence of any other magnetic force.

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