Pumping system and method of operation
First Claim
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1. A pumping system comprising:
- a pumping mechanism;
a motor for driving the pumping mechanism;
a variable frequency drive that supplies electrical power to the motor;
a controller for controlling the motor via the variable frequency drive, wherein the controller sets a maximum value for a current in the motor and a maximum value for rotational frequency in the motor;
a first temperature sensor for supplying a first signal to the controller, the first signal indicative of a temperature of gas exhausted from an outlet of the pumping mechanism; and
a second temperature sensor located on a stator adjacent to an inlet throat of the stator of the pumping mechanism for supplying a second signal to the controller, the second signal indicative of the temperature of the stator adjacent to the inlet throat of the stator of the pumping mechanism,wherein the controller adjusts at least one of the maximum value for current in the motor and the maximum value for rotational frequency in the motor based on a difference between the temperature of the gas exhausted at the outlet of the pumping mechanism, as indicated by the first signal, and the temperature of the stator adjacent to the inlet throat of the stator of the pumping mechanism, as indicated by the second signal, during operation of the pumping system.
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Abstract
A pumping system includes a pumping mechanism, a motor for driving the pumping mechanism, a device for supplying power of a variable frequency to the motor, a control device for setting a maximum value for a current in the motor, and a device for supplying to the control device data indicative of the temperature of gas exhaust from the pumping mechanism and a temperature of the stator of the pumping mechanism, wherein the control device is configured to use the received data to adjust the maximum value during operation of the pumping system.
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Citations
19 Claims
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1. A pumping system comprising:
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a pumping mechanism; a motor for driving the pumping mechanism; a variable frequency drive that supplies electrical power to the motor; a controller for controlling the motor via the variable frequency drive, wherein the controller sets a maximum value for a current in the motor and a maximum value for rotational frequency in the motor; a first temperature sensor for supplying a first signal to the controller, the first signal indicative of a temperature of gas exhausted from an outlet of the pumping mechanism; and a second temperature sensor located on a stator adjacent to an inlet throat of the stator of the pumping mechanism for supplying a second signal to the controller, the second signal indicative of the temperature of the stator adjacent to the inlet throat of the stator of the pumping mechanism, wherein the controller adjusts at least one of the maximum value for current in the motor and the maximum value for rotational frequency in the motor based on a difference between the temperature of the gas exhausted at the outlet of the pumping mechanism, as indicated by the first signal, and the temperature of the stator adjacent to the inlet throat of the stator of the pumping mechanism, as indicated by the second signal, during operation of the pumping system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a pumping system comprising:
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setting maximum values for current and frequency in a motor of the pumping system, wherein the pumping system includes a pumping mechanism, the motor, which is for driving the pumping mechanism, and a variable frequency drive unit for supplying power to the motor; receiving data indicative of a temperature of gas exhausted from an outlet of the pumping mechanism and a temperature of a stator of the pumping mechanism adjacent to an inlet throat of the stator of the pumping mechanism; and adjusting at least one of the maximum value for current in the motor and the maximum value for rotational frequency in the motor based on a difference between the temperature of the gas exhausted at the outlet of the pumping mechanism and the temperature of the stator adjacent to the inlet throat of the stator of the pumping mechanism, as indicated by the data, during operation of the pumping system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification