Pumps – Motor driven – Electric or magnetic motor
Patent
1992-10-14
1995-08-15
Bertsch, Richard A.
Pumps
Motor driven
Electric or magnetic motor
417 18, 417 22, 417 24, 417 45, 417223, 417319, 417420, 318432, F04B 4900
Patent
active
054413893
ABSTRACT:
An eddy current coupling with an electrically controllable field current is used to rotatably connect a drive motor to an oil well pumping mechanism where the eddy current drive speed is controlled to a reference speed using a speed feedback control system and operation can be limited in torque output by a torque feedback control system. In a first alternative embodiment, the eddy current coupling output speed is controlled by a stroke modulation unit using a first selected speed for the upward pumping stroke and a second selected speed for the downward pumping stroke. In a second alternative embodiment a controller is used to select torque or speed control for the upward or downward .pumping stroke. An eddy current coupling output stall condition is sensed by comparing the eddy current drive speed to a preselected stall speed and when the eddy current coupling output speed dips below the stall speed limit, the eddy current coupling coil electrical power is disconnected thereby terminating the electromagnetic coupling of the eddy current inductor and pole member to disconnect the drive motor from the oil well pumping mechanism.
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Sieger William L.
Watson Alvin J.
Wolcott John H.
Bertsch Richard A.
Eaton Corporation
Thai Xuan M.
Uthoff Jr. Loren H.
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