Linear motor powered pump unit
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United States of America Patent
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-
Jan 28, 1992
Grant Date -
N/A
app pub date -
Mar 8, 1989
filing date -
Mar 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump unit comprises a pump piston driven by a linear electric motor having induction and reaction members with closely adjacent flat surfaces. A reaction member can be sandwiched between two induction members. Co-operating induction and reaction members extend radially from a rod connected to the piston or to two axially spaced pistons or are grouped tangentially around it. The piston or pistons are driven synchronously and so that constant force is applied by way of a control system which includes a trajectory generator and a controller responsive to selected inputs relating to pump performance characteristics and feedback signals derived from measured current flow and piston position.
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