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US 5,068,554 AGranted
Electric motor
AssigneeFramo Developments (UK) Limited
InventorFrank Mohn
Life of this patent
Estimating the term…
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.
Claims22
An electric motor comprising:
- a housing,
- an output shaft having a longitudinal axis,
- means mounting said shaft in said housing for relative rotation around said axis and relative translation along said axis,
- electrical drive means carried by one of said shaft and said housing, said drive means comprising a plurality of axially spaced linear motor type annular windings oriented around said axis,
- driven means comprising a plurality of axially spaced discs of magnetic material carried by the other of said shaft and said housing, said drive and driven means having co-operating faces extending laterally of said shaft axis, and said drive means being energizable to act on said driven means, and
- energizing means selectively operable to energize said drive means so as to cause at least one of said relative rotation and said relative translation.
3 more elements
An electric motor comprising:
- a housing,
- an output shaft having a longitudinal axis, mounting said shaft in said housing for relative rotation around said axis and relative translation in at least one direction along said axis,
- electrical drive means comprising a plurality of winding means mounted on said housing,
- driven means comprising a plurality of axially spaced discs magnetic material mounted on said shaft, said drive and driven means having co-operating faces extending laterally of said shaft axis, and said drive means being energizable to act on said driven means, and
- energizing means selectively operable to energize said drive means so as to cause at least one of said relative rotation and said relative translation.
2 more elements
An electric motor comprising:
- a generally cylindrical housing having a longitudinal axis,
- a drive shaft extending along said longitudinal axis,
- bearing means journalling said drive shaft in said housing for relative rotation about said axis,
- a plurality of discs of magnetic material coaxially secured to said drive shaft at positions spaced therealong, said bearing means being operative between the peripheral outer edges of said discs and said housing,
- a plurality of annular electric winding elements secured to said housing internally thereof at positions spaced therealong, with each of said rotor discs between two of said plurality of electric winding elements, and
- energizing means for energizing said winding elements so as to effect said relative rotation of said housing and said shaft.
3 more elements
An electric motor comprising:
- a drive shaft,
- frame means around said drive shaft,
- mounting means mounting together said drive shaft and frame means for relative translational movement along said axis,
- at least one driven member of magnetic material secured to one of said shaft and said frame means,
- at least one electrical winding means secured to the other of said shaft and said frame means, said at least one driven member and said at least one electrical winding means each having a face extending transversely of said drive shaft,
- braking or abutment means carried by at least one of said transversely extending faces adapted to prevent engagement of said at least one driven member and said at least one electrical winding means, and
- energizing means for energizing said electrical winding means so as to effect said relative translational movement.
4 more elements
An electric motor comprising:
- a housing,
- an output shaft having a longitudinal axis mounting said shaft in said housing for at least one of relative rotation around said axis and relative translation along said axis,
- electrical driven means comprising a plurality of axially spaced discs of magnetic material mounted on said shaft,
- drive means comprising a plurality of winding means mounted in said housing, said drive and driven means having co-operating faces extending laterally said shaft axis, and said drive means being adapted to act on said driven means to effect said at least one of relative rotation and translation of said shaft and said housing, and
- energizing means adapted to energize at least a selected one of said winding means to effect said axial translation in one direction and at least one selected other of said winding means to effect said axial translation in the other direction.
2 more elements
An electric motor comprising:
- a housing,
- an output shaft having a longitudinal axis,
- means mounting said shaft in said housing for relative movement of said shaft and said housing along said axis,
- electrical drive means carried by one of said shaft and said housing,
- driven means carried by the other of said shaft and said housing, said drive means being energizable to act on said driven means to effect said relative movement in a selected one of a first direction and the direction opposite thereto, and
- energizing means adapted to energize said drive means to effect said movement.
3 more elements
Dependencies are inferred from the claim text.