Patent ID: 6727629
Filing Date: 2004-04-27
Classification: H02K

Abstract:
A rotary permanent magnet electric motor comprising:a stator comprising a plurality of separated, ferromagnetically isolated, electromagnet core segments disposed coaxially about an axis of rotation to form an annular cylindrical stator ring, each of the core segments comprising a plurality of poles integrally joined by a linking portion extending generally in the direction of the axis of rotation; and a cylindrical annular rotor concentric with the stator and spaced therefrom by a cylindrical annular air gap, said rotor comprising a plurality of permanent magnets having surfaces facing the air gap and forming axially spaced rings of separated magnets disposed circumferentially along the air gap, the number of said rings being equal in number to the number of stator poles in a stator core segment; wherein the poles of each stator core segment are offset from each other in the axial direction.