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US 9,062,684 B2Granted
Method of operating a pumping system
AssigneeEdwards Limited
InventorSimon Harold Bruce
Life of this patent
Estimating the term…
Abstract
A pumping system for evacuating an enclosure comprises a pumping mechanism (30), a motor (32) for driving the pumping mechanism, and a controller (36) for controlling the motor. The controller sets a maximum value for a rotational frequency of the motor and a maximum value for a current in the motor, and, to optimize the performance of the pumping system, independently adjusts the maximum values during evacuation of the enclosure.
Claims11
A pumping system comprising:
- a pumping mechanism;
- a motor for driving the pumping mechanism;
- a controller for controlling the motor,
- wherein the controller sets a maximum value for a rotational frequency of the motor and a maximum value for a current in the motor;
- and
- a pressure relief valve in fluid communication with an exhaust from the pumping mechanism for selectively releasing gas compressed by the pumping mechanism to the atmosphere,
- wherein at least one sensor is configured to detect the position of the pressure relief valve, the position of the pressure relief valve being indicative of a gas pressure within the pumping system, and
- wherein the controller is configured to adjust at least one of the maximum values depending on an indication of the detected position from the at least one sensor.
5 more elements
Dependencies are inferred from the claim text.