Patent ID: 6424070
Filing Date: 2002-07-23
Classification: H02K

Abstract:
In an angular displacement motor having a magnetized rotor mounted for rotational movement relative to a stator, said rotor and stator being elongated about an axis of rotation, said stator having an axial length and coils adapted to be selectively energized by a current so as to cause a torque to be exerted on said rotor, the improvement comprising:said stator having a first cross-section along a first portion of said axial length; said stator having a second cross-section along a second portion of said axial length; said first cross-section being so configured and arranged as to produce a centering torque on said rotor; said centering torque being a function of the angular displacement of said rotor from a centered position; said second cross-section being so configured and arranged as to produce a driving torque on said rotor; said driving torque being a function of said current and being substantially independent of said angular displacement of said rotor from said centered position.