Electric motors

摘要

An alternating current electric motor comprises a stator and a substantially flat armature of magnetic material. The armature is adapted to move relative to the stator and has a plurality of sections which are mutually spaced in the direction of intended movement of the armature. The stator has a plurality of poles having coplanar polefaces spaced apart in the direction of travel of the armature and all of the polefaces are spaced from and face one side only of the armature. At least one winding is wound upon the stator and is arranged so that upon energisation of the winding by an alternating current all of the polefaces are of like polarity and the relative flux density of adjacent ones of the polefaces is caused to alternate without polarity change about a mean value. The alternation of relative flux density of the adjacent polefaces induces movement of the armature relative to the stator.