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Asymmetric drive motor for a barrier operator or the like

  • US 6,777,902 B2
  • Filed: 03/20/2002
  • Issued: 08/17/2004
  • Est. Priority Date: 03/20/2002
  • Status: Expired due to Term
First Claim
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1. A motor for driving a movable barrier operator, said motor comprising:

  • a rotor capable of rotating in a first and a second direction;

    a stator, said stator comprising a first winding and a second winding, said first winding and second winding connected at one end to a neutral motor terminal;

    a first capacitor coupled across winding terminals at an other end of each of said first winding and said second winding;

    a direction control selectively passing alternating current (AC) to either side of said first capacitor to selectively rotate the rotor in the first or the second direction;

    a second capacitor selectively coupled across said first capacitor when AC is provided to one side of said first capacitor and disconnected from said first capacitor when AC is provided to a second side of said first capacitor to control the amount of power delivered by the motor;

    an apparatus for sensing motor speed; and

    a controller responsive to the sensed motor speed for controlling the selective coupling of the second capacitor.

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