Motor controller for pumping units

Details Motor controller for pumping units Motor controller for pumping units

1987-08-12

1990-06-19

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318778, 417 18, 361 24, 361 33, H02P 126, H02H 708

Patent

active

049356852

ABSTRACT:
A method and apparatus for controlling the operation of an oil well pumping unit in which the prime mover is a polyphase AC electric motor. The system comprises means for generating a plurality of signals representative of motor fault parameters including a motor winding overtemperature fault, undervoltage fault, and a phase imbalance fault. Upon occurence of a fault, a contactor in the motor supply leads is open to shut down the motor. After such shutdown because of undervoltage or phase imbalance faults the fault parameters are continuously scanned and once the fault has been cleared the motor is restarted. Where motor shutdown occurs because of an over temperature fault, the motor is maintained in a latched off shut down condition until an operator implemented reset occurs. An accessible counting memory is provided having separate registers for each of the fault conditions.

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patent: 4453117 (1984-06-01), Elms et al.
patent: 4490094 (1984-12-01), Gibbs
patent: 4695779 (1987-09-01), Yates

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