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Method for determining a rotor position of a rotary motor or linear motor, and circuit arrangement for carrying out the method

  • US 5,691,613 A
  • Filed: 05/28/1996
  • Issued: 11/25/1997
  • Est. Priority Date: 05/30/1995
  • Status: Expired due to Fees
First Claim
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1. A method for determining a position of a rotor of a rotary motor or linear motor having at least two stator windings and a rotor with salient poles and operating at a first frequency, comprising the steps of:

  • superimposing an exciting current for the stator windings with a periodic measuring current having a second frequency exceeding the first frequency of the motor so as to be prevented from interfering with excitation of the stator windings,measuring a reactive voltage drop caused by the measuring current across the stator windings;

    calculating on the basis of the measured voltage drop the inductance of the stator windings to provide an information about an actual rotor position;

    comparing the actual rotor position with a desired rotor position; and

    adjusting the actual rotor position in response to a deviation of the actual rotor position from the desired rotor position by modifying the exciting current.

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