In-well submersible motor with stacked component stator

DETAILED DESCRIPTION This invention relates to electric motors and more particularly to a submersible reciprocating motor especially adapted for use in actuating a reciprocating pump placed at the bottom of an oil well, although it may still find utility in other applications, e.
g.
robotics.
In an application filed Oct.
17, 1983 entitled Periodic Reciprocating Motor, Ser.
No.
542,634 applicant has disclosed a motor comprising an armature having a plurality of sections alternately of ferromagnetic and non-ferromagnetic material which travels axially within and is reciprocated by a stator comprising a stack of coils.
The coils are arranged in groups.
There are a plurality of groups with the corresponding coils of each group being connected as a set for simultaneous energization.
The sets are successively energized, several at a time to produce a plurality of moving fields simultaneously to sweep the armature sections in one direction from one end toward the other.
After one tandem sweep has been made and the armature moved one section length the sweep is repeated in the same direction to move the armature another section length.
The tandem sweeps are repeated until the armature has moved the desired distance (stroke).
Then the tandem sweeps are reversed to move the armature in the opposite direction a full stroke, completing one cycle.
The cycle is repeated as long as desired.
As disclosed herein, for use with a conventional sucker rod pump, the motor may be placed above the pump with its armature connected to the traveling valve and suitable flow path means provided to communicate the pump outlet with the pipe string above the motor.
The present invention relates to a construction of the motor adapting it to the geometry and environment at the bottom of an oil well.
The stator coils are of an annular disc or washer-like configuration, i.
e.
of less height than the outer diameter of the coils.
The coils are formed of insulated ribbons of copper or other conductive material.
The inner end of each coil is brought over the top or bottom of the coil to the outside and folded down along the outside of the coil adjacent to the similarly positioned outer end of the coil