Electric motor
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United States of America Patent
Stats
-
Nov 26, 1991
Grant Date -
N/A
app pub date -
Aug 30, 1989
filing date -
Aug 30, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric motor suitable for incorporation in pipestacks for drilling and pumping applications has a drive shaft (4) carrying spaced rotor discs (6) driven by annular stator windings (7) carried by the motor housing wall. The windings (7) are organized as linear motors operating on a circular path and provision can be made for energization of the windings so as to cause axial movement of the shaft, for hammering or braking action. The shaft (4) can be tubular to provide a passage for drilling mud, or for a fluid being pumped.
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