In-well submersible motor with stacked component stator

Claim 1

A submersible deep oil well pump motor comprising: a linear armature including a plurality of elongated equal-length sections of ferromagnetic material separated by equal-length sections of non-ferromagnetic material of shorter length than said ferromagnetic sections, each ferromagnetic section and one adjacent non-ferromagnetic section constituting an armature module, a linear stator including an inner tube concentrically surrounding said armature in relatively axially slidable relationship, and an outer tube concentric with and radially spaced outwardly from said inner tube and means connecting said inner tube and outer tube at each end of the tubes forming a closed annulus therebetween, said stator further including a plurality of annular field modules, said field modules being equal in length to said armature modules, each field module including a stack of a plurality of annular equal-diameter field coils, at least one coil in each module being electrically connected respectively with at least one corresponding coil in each of the other modules forming therewith a set of coils, and means for sequentially energizing adjacent sets of coils so that a first energizing cycle moves said linear armature in one direction and a second energizing cycle moves said linear armature in the opposite direction.