Dynamic speed control for pump motor
AssigneeRegal Beloit America, Inc.
InventorJustin M. Magyar
Life of this patent
Estimating the term…
Abstract
Systems and methods of controlling the speed of a pump configured to move liquid through a pump system are described. The actual motor speed of the pump motor is controlled by adjusting a current applied to the motor based on the difference between the actual motor speed and the target motor speed according to a gain setting. A first gain value is applied as the gain setting when the difference between the actual motor speed and the target motor speed does not exceed a first threshold. However, a second, higher gain value is applied when the difference between the actual motor speed and the target motor speed exceeds the first threshold.
Claims15
A pump system comprising:
- a pump configured to move a liquid through the pump system, the pump including a pump motor;
- and
- a pump controller configured to:
- determine a difference between an actual motor speed and a target motor speed,
- control the actual motor speed by adjusting a current applied to the motor based on the difference between the actual motor speed and the target motor speed according to a gain setting,
- apply a first gain value as the gain setting when the difference between the actual motor speed and the target motor speed does not exceed a first threshold, and
- apply a second gain value as the gain setting when the difference between the actual motor speed and the target motor speed exceeds the first threshold, the second gain value being greater than the first gain value.
A motor controller comprising a processor and a memory, the memory storing instructions that, when executed by the processor, cause the motor controller to:
- determine a difference between an actual motor speed and a target motor speed,
- control the actual motor speed by adjusting a current applied to the motor based on the difference between the actual motor speed and the target motor speed according to a gain setting, wherein increasing the gain setting causes the pump controller to adjust the current applied to the motor with greater sensitivity in response to the difference between the actual motor speed and the target motor speed;
- apply a first gain value as the gain setting when the different between the actual motor speed and the target motor speed does not exceed a first threshold;
- apply a second gain value as the gain setting when the difference between the actual motor speed and the target motor speed exceeds the first threshold and does not exceed a second threshold, the second gain value being greater than the first gain value;
- and
- apply a third gain value as the gain setting when the difference between the actual motor speed and the target motor speed exceeds both the first threshold and the second threshold, the third gain value being greater than both the first gain value and the second gain value.
Dependencies are inferred from the claim text.