Method and apparatus for controlling operation of a submersible pump
AssigneeGeneral Electric Company
InventorsMassimo Polo, Stefano Cavagna, Robert M. Gamber, Charles E. Konrad
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Abstract
A submersible pumping system which, in one embodiment, includes a motor, a pump and a control circuit, or unit, coupled to the motor for controlling the operation of the motor is described. Using motor and sensor signals, the control unit detects various conditions within the pumping system and alters motor operation. In an exemplary embodiment, the control unit initiates an oscillation sequence of applying a forward torque for a first preselected period of time, applying a reverse torque for a second preselected period of time, and then repeating the torque applying steps a selected number of times to eliminate an obstruction from the pump.
Claims33
A method for operating a deep well pumping system including a pump, a motor coupled to the pump, and a control unit coupled to the motor, the control unit includes a timer for measuring time, said method comprising the steps of:
- initiating a start sequence of the motor;
- determining whether a timer value exceeds a first valid time range;
- if the timer value exceeds the first valid time range, then determining whether a motor frequency is less than or equal to a first valid frequency range;
- and
- if the motor frequency does not exceed the first valid frequency range, then altering signals supplied to the motor.
A deep well pumping system including a pump, a motor coupled to said pump, and a control unit coupled to said motor, said control unit comprises a timer for measuring time, said system configured to:
- initiate a start sequence of said motor;
- determine whether a timer value exceeds a first valid time range;
- if the timer value exceeds the first valid time range, then determine whether a motor frequency is less than or equal to a first valid frequency range;
- and
- if the motor frequency does not exceed the first valid frequency range, then alter signals supplied to said motor.
A control unit for a deep well pumping system including a motor coupled to a pump, said control unit coupled to the motor, said control unit comprises a timer for measuring time, said control unit configured to:
- initiate a start sequence of the motor;
- determine whether a timer value exceeds a first valid time range;
- if the timer value exceeds the first valid time range, then determine whether a motor frequency is less than or equal to a first valid frequency range;
- and
- if the motor frequency does not exceed the first valid frequency range, then alter signals supplied to the motor.
Dependencies are inferred from the claim text.