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Induction type motion sensor

  • US 5,416,372 A
  • Filed: 08/19/1993
  • Issued: 05/16/1995
  • Est. Priority Date: 08/21/1992
  • Status: Expired due to Fees
First Claim
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1. A motion sensor comprising:

  • a stator having a permanent magnet as a fixed part thereof, said stator having an air gap;

    an electrical coil wound around said stator; and

    a pendulum freely rotatable around an axis and having an eccentric mass distribution relative to said axis for freely oscillating in response to a movement force, said pendulum having a plurality of ferromagnetic teeth at a periphery thereof disposed to move through said air gap, and thereby induce current in said coil, upon oscillation of said pendulum.

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