Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1989-05-11
1990-11-20
Smith, Leonard E.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 24, 417 45, 417 53, 318808, F04B 4900
Patent
active
049715224
ABSTRACT:
A control system for an AC motor driven cyclic load, such as a beam pumping unit, includes a flywheel, transducer, tachometer, outside set point source, controller, and variable frequency power supply. The flywheel is rotatably connected between the motor and the cyclic load for receiving and storing rotational kinetic energy from the motor and the load during portions of a cycle of the cyclic load when there is excess energy and returning the stored rotational kinetic energy to drive the cyclic load during portions of a cycle when there is an energy demand by the cyclic load. The transducer generates a transducer signal which is a function of the cycle speed. The tachometer means generates a tachometer signal which is a function of the speed of rotation of the motor's rotor. The outside set point source generates an outside set point signal representative of a desired set point cycle speed of the cyclic load. The controller receives the transducer signal, the tachometer signal and the outside set point signal and generates a control signal representative of the adjustment to the power supply frequency of the motor needed to achieve the set point cycle speed. The variable frequency power supply receives the control signal and adjusts the frequency of the power supplied to the motor accordingly.
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Scheuermann David W.
Smith Leonard E.
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