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Control of brushless D-C motors

  • US 3,906,320 A
  • Filed: 10/23/1973
  • Issued: 09/16/1975
  • Est. Priority Date: 10/27/1972
  • Status: Expired due to Term
First Claim
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1. Method of controlling the operation of brushless d-c motors having a rotor (26), winding means (11, 12) being pulse-energized to generate torque pulses, and means (45, 46) to store magnetic energy during generation of torque and to release the stored energy during gaps between torque pulses to provide substantially uniform torque to the rotor during rotation thereof;

  • comprising the steps of deriving a signal (U70) representative of voltage induced in the motor winding means;

    separating said signal into its a-c and its d-c components;

    displacing the a-c component to derive a displaced signal (103) having absolute maxima and minima values which are displaced with respect to the absolute maxima and minima of said a-c component;

    controlling the timing of energization of said motor winding means, with respect to angular rotor position, in dependence on said displaced a-c component; and

    controlling the inteNsity of energization of said winding means in accordance with the d-c component.

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