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Mechanical vibration to electrical energy converter

  • US 7,498,681 B1
  • Filed: 03/21/2007
  • Issued: 03/03/2009
  • Est. Priority Date: 03/21/2007
  • Status: Active Grant
First Claim
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1. An apparatus for generating a voltage in response to an external source of vibrations, the apparatus comprising:

  • a frame;

    a ferromagnetic circuit attached to the frame, the ferromagnetic circuit having a gap;

    an electrically conductive coil wound around at least a portion of the ferromagnetic circuit;

    a magnet moveably coupled to the frame by a coupling, the coupling operatively arranged to allow a motion of the magnet through the gap, the frame comprising a material having a coefficient of thermal expansion that approximately matches a coefficient of thermal expansion of the coupling;

    a restrainment for limiting an extent of the motion of the magnet, whereby the motion of the magnet through the gap induces the voltage in the coil.

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