Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1984-10-09
1987-04-28
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318474, 417 12, 417 53, 73151, H02P 500, F04B 4900
Patent
active
046617515
ABSTRACT:
A well pump control system is disclosed for utilization with a conventional well pump having a stationary member and a reciprocating member. The reciprocating member operates a down-hole pump and is attached to a rocking beam through a load cell. The rocking beam is driven by an electric motor through a counterbalanced crank. The strain present on the reciprocating member as detected by the load cell is utilized to operate a variable frequency drive unit which acts to control the frequency of the voltage applied to the electric motor. In this manner, the speed of the motor may be selectively and gradually varied during the pump cycle to both minimize power consumption and increase slip during heavy loading. Additionally, the maximum amount of strain present on the reciprocating member can be controlled throughout the entire cycle to minimize maintenance costs associated with excessive strain.
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Freeman Claude C.
Ip Shik Luen Paul
Shoop Jr. William M.
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