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US 2005/0029974 A1Published application
Asymmetric drive motor for a barrier operator or the like
AssigneeThe Chamberlain Group, Inc.
InventorsJames Fitzgibbon, Edward Laird
Life of this patent
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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 of speed. The drive power is controlled by electrically changing the capacitance value for a permanent split capacitor motor.
Claims5
A barrier movement arrangement comprising:
- a motor having a first power output and a second power output, for moving a barrier between open and closed positions;
- first apparatus for enabling the first power output;
- second apparatus for enabling the second power output, the second power output being greater than the first;
- and
- a controller responsive to sensed barrier movement conditions for controlling the first apparatus to enable the motor at the first power output when predetermined conditions are sensed and for controlling the second apparatus to enable the motor at the second power output when predetermined other conditions are sensed.
2 more elements
Dependencies are inferred from the claim text.