Asymmetric drive motor for a barrier operator or the like
First Claim
Patent Images
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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Accused Products
Abstract
An asymmetrical drive motor and apparatus with the asymmetric drive motor driving a barrier. The asymmetric drive motor drives the barrier at different drive powers according to direction, time of travel, safety requirements or speed. The drive power is controlled by electrically changing the capacitance value for a permanent split capacitor motor.
26 Citations
18 Claims
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1. A motor for driving a movable barrier operator, said motor comprising:
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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. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10)
a light relay selectively passing AC to said direction controller when said motor is energized; and
said direction controller passing AC from said light relay to a selected one of said one side and said second side of said first capacitor.
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6. A motor as in claim 5 further comprising:
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a down relay connected between said direction relay and said second side, said down relay passing current to said second side of said first capacitor when said down relay is energized; and
a higher power relay series connected with said second capacitor.
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7. A motor as in claim 6 further wherein:
said higher power relay and said down relay are energized mutually exclusively.
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8. A motor as in claim 7 wherein said down relay is connected between said direction controller and said second side of first capacitor, said high power relay and said direction controller being coupled to said one side of said first capacitor.
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9. A motor as in claim 8 wherein said first capacitor is series connected at said one side with a second high power relay and further including a bleed resistor parallel connected with each of said first capacitor and said second capacitor, wherein at least one of said down relay, the first said high power relay and said second high power relay always being de-energized.
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10. A motor as in claim 8 wherein one end of said series connected high powered relay and said second capacitor is connected between said light relay and said direction controller and to said second end of said first capacitor.
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3. A motor for driving a movable barrier operator, said motor comprising:
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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;
apparatus for sensing a time for which the motor has been in motion; and
a controller is responsive to the sensed time for controlling the selective coupling of the second capacitor.
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4. A motor for driving a movable barrier operator, said motor comprising:
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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; and
wherein the motor is connected to move a barrier and comprising an apparatus for sensing a distance of travel of the barrier and a controller for controlling the selective coupling of the second capacitor according to the distance of travel.
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11. A movable barrier operator including a motor for driving a movable barrier operator, said motor comprising:
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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; and
whereby said motor provides power at a first drive power level for driving said movable barrier operator into a first open position and at a second drive power level for driving to a closed position, said first drive power level being greater than said second drive power level.
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12. An apparatus for opening and closing a garage door comprising:
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an alternating current asymmetric drive motor driving a garage door open at a first drive power and dosed at a second drive power;
a motor control circuit selecting drive power for said asymmetric drive motor responsive to door control commands and an indication that said garage door is being opened or closed, said first drive power being greater than said second drive power; and
wherein said asymmetric drive motor comprises;
a rotor;
a stator, said stator comprising a start winding and a drive winding, said start winding and drive winding connected at one end to a neutral motor terminal;
a first capacitor coupled across winding terminals at an other end of said start winding and said drive winding;
a direction switch selectively passing alternating current (AC) to either side of each of said first capacitor responsive to said motor control circuit; and
a second capacitor coupled across said first capacitor to select said first drive power, AC being provided to one side of both said first capacitor and said second capacitor, responsive to said motor control circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18)
a light relay selectively energizing a light and passing AC to said direction relay when said motor is energized responsive to said motor control circuit;
said direction switch passing AC from said light relay to a selected one of said one side and a second side of said first capacitor responsive to said motor control circuit, said second capacitor being disconnected when AC is passed to said second side.
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14. An apparatus as in claim 13 further comprising:
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a down relay connected between said direction relay and said second side, said down relay passing current to said second side of said first capacitor when said down relay is energized;
a high power relay series connected with said second capacitor, said motor control circuit mutually exclusively energizing either of said higher power relay and said down relay.
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15. An apparatus as in claim 13 wherein said down relay is connected between said direction relay and said second side of said first capacitor, said higher power relay and said direction relay being coupled to said one side of said first capacitor.
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16. An apparatus as in claim 15 wherein said first capacitor is series connected with a second higher power relay, and further including a bleed resistor parallel connected with each of said first capacitor and said second capacitor, said motor control circuit maintaining at least one of said down relay, the first said higher power relay and said second higher powered relay deenergized.
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17. An apparatus as in claim 15 wherein one end of said series connected high powered relay and second capacitor are connected at one end to said light relay and said direction relay and at another end to said second end of said first capacitor.
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18. An apparatus as in claim 12 further comprising a sensor sensing garage door rate of travel.
Specification