HVAC actuator with soft stall control
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United States of America Patent
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-
Oct 11, 2016
Grant Date -
Nov 19, 2015
app pub date -
Jul 24, 2015
filing date -
Jun 26, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A actuator in a HVAC system includes a motor and a drive device driven by the motor. The drive device is coupled to a movable HVAC component for driving the movable HVAC component between multiple positions. The actuator further includes a main actuator controller that determines when the drive device is approaching an end stop and a pulse width modulation (PWM) speed controller that generates a PWM speed output for controlling a speed of the motor. The PWM speed controller sets the PWM speed output to zero in response to a determination that the drive device is approaching the end stop. The PWM speed controller then increases the PWM speed output until the end stop is reached, thereby causing the speed of the motor to increase as the drive device approaches the end stop.
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