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HVAC actuator with output torque compensation

  • US 8,084,982 B2
  • Filed: 11/18/2008
  • Issued: 12/27/2011
  • Est. Priority Date: 11/18/2008
  • Status: Active Grant
First Claim
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1. A spring return actuator for driving an HVAC component, comprising:

  • a motor;

    a drive train driven by the motor, the drive train being configured to drive the HVAC component;

    a return spring configured to providing a varying opposing torque to the motor across a range of motion of the HVAC component; and

    a controller configured to regulate a maximum output torque of the motor in accordance with the varying opposing torque provided by the return spring such that the drive train outputs a relatively constant maximum torque to the HVAC component across at least part of the range of motion of the HVAC component when the HVAC component is being driven by the motor.

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