Linear induction motor magnetic field assemblage producing constant thrust per unit width of the armature

Claim 1

A linear induction motor, polyphase energizable magnetic field assemblage adapted to generate, when energized, a magnetic field traveling along an end surface thereof to produce a reaction force in armature strip means adapted for relative movement with respect to and over said end surface, said magnetic field assemblage comprising a plurality of elementary magnetic circuits cooperating with a common polyphase field winding, said end surface being divided thereby into a corresponding plurality of elementary salient pole faces extending each longitudinally in the direction of travel of said magnetic field, said elementary pole faces being parallelly juxtaposed and spaced apart transversely of said direction a distance from each other, each magnetic circuit being individually polyphase energizable by said common field winding, said common field winding producing, when polyphase energized, a magnetic field traveling in said direction along the elementary pole face of each of said magnetic circuits to induce in contronting substantially coextensive parts of said armature strip means loop currents linking said elementary pole faces respectively individually so as to develop a substantially constant reactive force per unit width in juxtaposed parts of said armature strip means.