HVAC Control Valve Actuator Torque Modulation for Blockage Release

The actuator applies dynamic torque modulation instead of static overdimensioning. The control circuit repeatedly changes the drive torque between a first torque value and a second torque value, and periodically modulates the first torque value between a third torque value and a fourth torque value. This dynamic approach provides sufficient torque to overcome blockages while avoiding continuous high torque application, thus protecting the actuator without requiring an overdimensioned torque range.

The invention changes the torque parameter dynamically during operation. By monitoring rotation angle changes and detecting blocking conditions, the system adjusts the drive torque parameter adaptively. When blocking is detected, the torque is increased to overcome the blockage, then reduced afterward. This parameter change approach allows the actuator to handle blockages effectively without needing a constantly high torque capacity.

The control circuit implements periodic torque modulation to release blockages efficiently. The drive torque is repeatedly changed between different values in a periodic manner, and the first torque value is periodically modulated between a third and fourth torque value. This periodic action creates oscillating forces that help break through blockages without requiring continuous high torque, thereby preventing overheating and damage to the actuator.

The system prepares for potential actuator damage by implementing torque limitation and modulation before damage can occur. The control circuit is designed to limit the maximum torque values and to reduce torque after blockage detection, providing a cushioning effect that prevents the actuator from overheating or suffering mechanical damage during the blockage release process.