Multiphase motor with magnetized rotor having N pairs of poles with axial magnetization

Claim 1

A multiphase motor with a magnetized rotor having N pairs of rotor poles, the axis of magnetization of each rotor pole being parallel to the axis of rotation of said rotor, wherein the magnetization axes of the rotor poles are regularly distributed around the axis of rotation of said rotor, the adjacent rotor poles having opposite polarities, wherein the rotor is mounted opposite a stator, said stator formed with m phases where m=N/2n, n being an integer and m being an integer greater that 1, each phase comprising two substantially coplanar polar pieces, one of which is interpositioned in the other one and being separated therefrom by a sinuous air-gap, wherein for m-1 phases as well as for a first polar piece of the remaining phase, the stator poles of every polar piece, being n=N/2m in number, are full and spaced apart by an angular interval at least approximately two times larger than that between the adjacent rotor poles, (N/2m)-1 stator poles of a second polar piece of the remaining phase being full, wherein the m remaining stator poles of said second polar piece are fractional, the sum of the arcs of all fractional stator poles being at least approximately equal to the arc of a full pole, wherein the phases are phase-shifted with respect to one another, wherein the two polar pieces of every phase are magnetically connected to first and second ends, respectively, of a respective core, and wherein each core has at least one coil wound thereon.