Eddy current drive and motor control system for oil well...

Details Eddy current drive and motor control system for oil well... Eddy current drive and motor control system for oil well...

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 49/06 (2006.01) F16D 27/00 (2006.01) F16D 48/06 (2006.01)

Patent

CA 2091707

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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