HVAC actuator with soft stall control
First Claim
1. An actuator in a HVAC system, the actuator comprising:
- a motor;
a drive device driven by the motor and coupled to a movable HVAC component for driving the movable HVAC component between multiple positions;
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, wherein 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 and 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.
1 Assignment
0 Petitions
Accused Products
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.
39 Citations
20 Claims
-
1. An actuator in a HVAC system, the actuator comprising:
-
a motor; a drive device driven by the motor and coupled to a movable HVAC component for driving the movable HVAC component between multiple positions; 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, wherein 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 and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for controlling a HVAC actuator that includes a motor and a drive device driven by the motor and coupled to a movable HVAC component, the method comprising:
-
operating the motor to drive the movable HVAC component between multiple positions; generating, by a pulse width modulation (PWM) speed controller of the actuator, a PWM speed output for controlling a speed of the motor; determining, by a main actuator controller of the actuator, when the drive device is approaching an end stop; setting, by the PWM speed controller, the PWM speed output to zero in response to a determination that the drive device is approaching the end stop; and increasing, by the PWM speed controller, 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification