Patent attributes
The invention relates to a permanent magnet coupling for the synchronous transmission of torque, comprising a first member (1) having permanent magnets (4a, 4b) and a second member (2), the members being designed as inner rotor and outer rotors and separated by an air gap (3) extending between the members (1, 2), wherein the members (1, 2) are coupled to enable a synchronous movement by forces generated by the permanent magnets (4a, 4b) by the interaction with the second member (2), wherein the first member (1) comprises a first group of permanent magnets (4a) having magnetizing directions parallel to the air gap (3) and a second group of permanent magnets (4b) having magnetizing directions perpendicular to the air gap (3), wherein the permanent magnets (4a, 4b) of the first group and of the second group of the first member (1) are alternately arranged in the circumferential direction, and wherein, as viewed in the circumferential direction, the consecutive permanent magnets (4a) of the first group and the consecutive permanent magnets (4b) of the second group have opposing magnetizing directions, respectively. According to the invention, the permanent magnets (4b) of the second group, starting from the air gap (3), are arranged offset toward the back with respect to the permanent magnet (4a) of the first group such that permanent magnet-free intermediate spaces (5), in particular made of soft iron, remain between the air gap (3) and the permanent magnet (4b) of the second group, said intermediate spaces being delimited laterally by the permanent magnets (4a) of the first group.
