Patent ID: 6710502
Filing Date: 2004-03-23
Classification: H02K

Abstract:
A rotary electric motor comprising:a cylindrical annular permanent magnet rotor disposed coaxially about an axis of rotation; a stator comprising a plurality of separate electromagnets having respective core segments; and a non-ferromagnetic support structure, the stator core segments affixed thereto and distributed without ferromagnetic contact with each other in an annular ring concentric with the rotor and separated therefrom by a radial air gap, the core segments thereby respectively defining separate magnetic paths isolated from each other, wherein each stator core segment further comprises: a center pole and two lateral poles having pole face surfaces at the air gap, the center pole integrally joined on each axial side thereof by a linking portion to a respective lateral pole to form an axial row of stator poles parallel to the axis of rotation, the linking portions being radially offset, relative to the stator poles, from the air gap; and a winding, exclusive to its respective core segment, to develop concurrently, when energized with current, one magnetic polarity in each of the lateral poles and an opposite magnetic polarity in the center pole.