Asymmetric drive motor for a barrier operator or the like

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.

1 . 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 . A barrier movement arrangement in accordance with  claim 1  comprising apparatus for sensing expected barrier movement direction and wherein the controller responds to the sensed condition that a barrier is to be moved toward the open position for controlling the second apparatus to enable the motor at the second power output.  
   
   
       3 . A barrier movement arrangement according to  claim 1  comprising apparatus for sensing an expected direction of barrier movement and wherein the controller responds to a sensed condition that the barrier is to be moved toward the closed position for controlling the first apparatus to enable the first power output to start and move the door.  
   
   
       4 . A barrier movement arrangement according to  claim 1  comprising the ability to sense obstructions to barrier movement wherein the controller responds to sensed obstructions by reversing a direction of travel of the barrier and by controlling the second apparatus to enable the motor at the second power output.  
   
   
       5 . A barrier movement arrangement according to  claim 1  comprising the ability to sense barrier movement speed after the motor has been started and the controller responds to barrier movement speed after the motor has been started to control the second apparatus to enable the motor at the second power when the sensed barrier movement speed is below a predetermined value.