Symmetrical two phase motor with a bipolar permanent magnet rotor and method of making such a motor

A method of making a motor of small size having a stator with several magnetic poles around an aperture provided for the permanent magnet rotor, the method comprising the following successive steps:

• (a) cutting out a plate formed of a magnetic material so as to define the aperture for the rotor and the several magnetic poles that extend in the same general plane, these poles defining pole pieces separated by slots in the peripheral region of the aperture, at least a part of the slots are blind so that the magnetic poles remain formed physically as a single part at this stage;
• (b) applying an annular element to the cut out plate in a manner centered relative to the aperture, wherein the slots and this annular element are arranged so that the annular element passes over the slots and the slots extend beyond an external contour of the annular element, wherein the annular element is at least partially covering the several magnetic poles and is formed of a non-magnetic or weakly magnetic material relative to the plate of magnetic material;
• (c) fixing the annular element to the several magnetic poles;
• and
• (d) cutting the plate in such a manner as to extend at least two of the blind slots to obtain through slots magnetically separating at least one of the magnetic poles from the other poles of the stator thus formed.