Electromotor with rotor comprising circle of magnets - has holder for magnets to ensure concentric mounted on shaft

摘要

The electromotor has a rotor consisting of a circle of magnets with diametral poles axes mounted exactly concentric on the shaft even though its central hole may not be quite concentric. This is achieved by mounting the magnets on a holder or nonmagnetic material and fixing the holder to the shaft. The magnets are held concentric to the shaft by being centered with the holder by means of an aligned circular recess in the holder, this recess being coaxial with the shaft. The holder is held to the shaft by a clamp that forms part of the shaft itself, e.g. such as plate or disc.