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Position sensor for generating a voltage changing proportionally to the position of a magnet

  • US 4,774,465 A
  • Filed: 02/06/1987
  • Issued: 09/27/1988
  • Est. Priority Date: 03/27/1986
  • Status: Expired due to Term
First Claim
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1. A magnetic position sensor for generating a signal corresponding to the position of a moveable test object, said test object generating a magnetic field, said sensor being for use with an alternating voltage source and comprising in combination with said test object:

  • a strip-shaped core consisting of material having low magnetic coercivity disposed out of contact with said test object but within the magnetic field of said test object so as to be saturated thereby at a location along said core corresponding to the position of said test object;

    two excitation coils spaced from each other with at least a portion of said core therebetween, said excitation coils respectively connectable to said alternating current source for oppositely magnetizing said core; and

    a secondary coil wound around said core between said excitation coils, said secondary coil having terminals across which a position signal is measured,whereby upon magnetization of said core by said excitation coils, a simulated air gap is generated at a location along said core by said test object, thereby changing the voltage across said terminals of said secondary coil corresponding to said position signal.

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