Patent ID: 7573169
Filing Date: 2009-08-11
Classification: H02K

Abstract:
1. A permanent magnet rotor for use in a motor having a stator, the rotor comprising: a shaft with a periphery; a hollow cylindrical permanent magnet; an elastic connecting medium between the shaft and the permanent magnet, wherein the permanent magnet is arranged co-axially around the shaft and the elastic connecting medium is arranged in several first areas along the periphery of the shaft, in which the distance between the shaft and the permanent magnet is a first distance, which is separated from second areas in which the distance between the shaft and the permanent magnet is a second distance that is smaller than the first distance and greater than zero and wherein the second areas are dimensioned in such a way that a small longitudinal expansion compensation of the shaft material is possible as compared to the permanent magnet material, but a large deflection of the permanent magnet in relation to the stator is prevented.