Abstract: An electrical multi-pole machine comprises a stator (1) having a soft-magnetic outer body (7) with permanent magnets comprising pole faces (9A-9D, 10A-10D, 11A-11D) arranged along a circular path, a rotor (3) which is coaxial with the stator and which comprises a soft-magnetic inner body (13) with teeth (15-22) comprising regularly spaced tooth surfaces (15A-22A) disposed along a circular path and which cooperate with the pole faces via an air gap (23), at least three active coils (29, 30, 31), and a machine shaft (5). The pole faces are arranged in groups, at least three groups (9, 10, 11) of magnets being provided, which groups are spaced from each other by coil slots (25, 26, 27) in which coil sides (29A, B, 30A, B, 31A, B) of the active coils are accommodated. Adjacent pole faces in each of said groups have opposite polarities.

Abstract: Electric multipolar machine, comprising a first machine part (1) with a magnetically soft outer element, a second machine part (3) arranged coaxially relative to the first machine part, with a magnetically soft inner element, provided with at least three teeth (17-19) and active coils (23, 24, 25), permanent magnets arranged in a circular path and ending in pole faces (31A1-A4, 31B1-B4, 31C1-C4), which mate with tooth faces (15A-H) across an air gap (35, 37), and a machine shaft (5), about which one of the abovementioned machine parts is rotatable relative to the other machine part. The outer element of the first machine part has at least one toothed magnetically soft disc-shaped plate (9, 11), which is provided with tooth faces distributed uniformly over the periphery of the plate.

Abstract: An electrical machine comprises a rotor (2) and a stator (5) as machine parts, means for generating an excitation flux, and active coils (W1-W5). In operation the coils link at least a portion of the excitation flux and generate a rotational e.m.f. The rotor and the stator comprise poles, the number of stator poles (N1-N6, S1-S6) differing from the number of rotor poles (T1.sup.x -T5.sup.x). During operation, the flux pattern of the portion of the excitation flux linking with the active coils rotates relative to the machine part carrying the active coils with such an angular velocity that the absolute value of the difference between said angular velocity and the angular velocity of the machine part comprising the active coils is larger than the absolute value of the difference in angular velocity between the rotor and the stator. For this purpose the pole faces (RS) of the rotor poles, viewed in the circumferential direction of the rotor, have a different width than the pole faces (PS) of the stator poles.