Electric multipolar machine

A multi-polar rotary machine comprising a stator; and a cylindrical outer rotor (10) arranged concentrically with the stator (6) and with an air gap therebetween. The stator (6) has two splitted stator elements (4, 5) and a ring shaped permanent magnet (3) held between the stator elements (4, 5) and magnetized so as to form N and S poles in the axial direction of the stator (6). A plurality of small stator teeth A and A¯ and B¯ and B separated in the axial direction of the stator (6) from each other, respectively, are formed on the outer peripheral surface of the splitted stator elements (4, 5). Stator windings (12, 13) for A phase and B phase are wound around the stator elements (4, 5), respectively. The rotor (10) has a plurality of small rotor teeth similar in number to the small stator teeth. The small stator teeth A, A¯, B¯ and B are circumferentially shifted from said small rotor teeth by a 1/4 pitch of the small stator teeth, respectively. Each of the stator (6) and rotor (10) is formed of pressed powder consisting of soft magnetic material, and of resin and / or inorganic material. A ratio of a thickness of the small stator teeth A¯ in the axial direction of the stator (6) to a thickness of the small stator teeth A in the axial direction of the stator (6) or a ratio of a thickness of the small stator teeth B¯ in the axial direction of the stator to a thickness of the small stator teeth B in the axial direction of the stator (6) is set to a value smaller than 1 so as to equalize substantially in mean permeance both small stator teeth A and A¯ or B¯ and B to each other.