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Method and apparatus for measuring angular displacement

  • US 4,691,192 A
  • Filed: 08/27/1986
  • Issued: 09/01/1987
  • Est. Priority Date: 03/25/1983
  • Status: Expired due to Fees
First Claim
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1. A method of measuring angular displacement comprising the step of:

  • rotating a multi-pole rotor about an axis;

    producing a periodic signal from the passage of poles on the rotor past a sensor journalled about the axis for orbital movement along the periphery of the rotor;

    generating an index mark once each revolution of the rotor as a selected pole passes a selected location on the periphery;

    positioning the sensor to a reference orbital position;

    measuring for an integral number of revolutions beginning upon and relative to a first index mark the times at which each pole passes the sensor at the reference orbital position;

    averaging the times obtained by the measuring step at the reference orbital position to obtain a reference average time of occurrence of a pole passing the sensor;

    positioning the sensor to an input orbital position;

    measuring for an integral number of revolutions beginning upon and relative to a second index mark the times at which each pole passes the sensor at the input orbital position;

    averaging the times obtained by the measuring step at the input orbita1 position to obtain an input average time of occurrence of a pole passing the sensor; and

    expressing the difference between the reference average time of occurrence and the input average time of occurrence as a fraction of the time required for one revolution.

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