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Magneto-resistive tachometer sensor module with different resolution outputs for the same magnetic drum

  • US 5,654,633 A
  • Filed: 05/05/1995
  • Issued: 08/05/1997
  • Est. Priority Date: 01/17/1992
  • Status: Expired due to Fees
First Claim
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1. A tachometer including an enclosure for monitoring the speed and direction of rotation of a rotatable shaft, the tachometer comprising:

  • a drum member attachable to the shaft for rotation therewith, the drum member being at least in part enclosed by the enclosure, the drum member having at least one magnetic pattern thereon; and

    a sensor module, removably mountable to the enclosure, the sensor module comprising;

    at least one magnetoresistive sensor disposed to cooperate with said drum member, and adapted to sense rotation of said shaft via said at least one magnetic pattern and further adapted to provide at least a responsive pair of electrical signals in quadrature; and

    a programmable circuit connected to receive said pair of quadrature electrical signals, said programmable circuit scaling timings of said quadrature signal pair to provide at least a pair of scaled quadrature output signals, said programmable circuit including an output resolution selection circuit for setting the output resolution of said sensor module;

    wherein said drum member in combination with a sensor module can be used to produce at least any selected one of plural different quadrature output resolutions each responsive to the same drum member magnetic pattern, the resolution of the sensor module quadrature output signals being determined by the output resolution set by the output resolution selection circuit.

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