Vertically reciprocating constant power drive unit for raising a load step by step
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United States of America Patent
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Mar 23, 1993
Grant Date -
N/A
app pub date -
Jun 10, 1991
filing date -
Dec 12, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vertically reciprocating and substantially constant power drive unit, including pumping equipment situated at the bottom of a string of drive rods is provided. The drive unit comprises a linear electric motor whose field inductor and whose armature are constituted by two coaxial cylindrical parts, one of which is coupled to the top end of the drive rods and is movable relative to a stationary structure. A balancing device exerts a force on the moving equipment constituted by the pumping equipment, the rods, and the motor coupled thereto, which force is equal and opposite to the sum of the weight of the moving equipment plus one-half the weight (H/2) of the load.
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