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Bounded synchronous angle counter

  • US 5,041,979 A
  • Filed: 06/21/1989
  • Issued: 08/20/1991
  • Est. Priority Date: 04/08/1987
  • Status: Expired due to Term
First Claim
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1. In a system for measuring angle of a rotating rotor having rotor markings including a reference marking at a reference position on the rotor and a plurality of other markings spaced about the rotor, an angle measuring device for accurately indicating angular position of the rotor relative to the reference position in view of perceived changes of rotor speed, comprising:

  • means for detecting each of at least said other rotor markings and generating a signal pulse in response thereto;

    interpolation means, responsive to said signal pulses, for indicating relative angular position of said rotor by providing a plurality of interpolated angular position signal pulses, having a rate of occurrence, between each of said sensor signal pulses;

    counting means responsive to said sensor signal pulses and said interpolated angular position signal pulses, for generating a position signal which includes a binary number corresponding to a unique position of the rotor relative to the reference position; and

    correction means, responsive to time occurrences of said sensor signal pulses, for correcting said position signal by modifying the rate of occurrence of said interpolated angular position signal pulses;

    whereby the position signal is corrected in response to the sensor signal pulses so as to provide accurate indication of the position of the rotor.

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