Multiphase motor with magnetized rotor having N/2 pairs of poles at its periphery

A multiphase motor with magnetized rotor having N/2 pairs of rotor poles at its periphery,

• wherein said rotor poles result from magnetization flux lines of the rotor which are contained in a plane perpendicular to the axis of rotation of said rotor, and wherein said rotor poles are regularly distributed at the rotor periphery and have alternate opposite polarity,
• wherein the rotor is surrounded by a stator the poles of which are concentric to the rotor, said stator being formed with m phases, wherein m=N/2n, n being a positive integer, and m being a positive integer greater than 1,
• wherein every phase comprises two polar pieces interpositioned one in the other one and 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 separated from one another by an angular interval at least approximately twice as large as that between the adjacent rotor poles at the periphery of the rotor, and (N/2m)-1 stator poles of a second polar piece of the remaining phase are full,
• wherein the m remaining stator poles of said second polar piece are fractional, the sum of their arcs being at least approximately equal to the arc of a full stator pole,
• wherein the phases are displaced with respect to one another, wherein the polar pieces of every phase are magnetically connected to one another by a core and wherein at least one coil is wound around every core.