Patent ID: 7768168

Claim:
An electrical machine comprising a rotor ( 1 ) a stator, an essentially hollow cylindrical permanent magnet ( 3 ) the permanent magnet ( 3 ) having axial and/or radial contact faces ( 9 , 14 ), and retaining elements ( 4 , 5 ) each having an integrally formed resilient region securing the permanent magnet ( 3 ) to the rotor ( 1 ) at the axial and/or radial contact faces ( 9 , 14 ), the permanent magnet ( 3 ) being elastically supported in the axial direction (X-X) and/or the radial direction of the rotor ( 1 ) by means of the retaining elements ( 4 , 5 ), further comprising a disklike friction element ( 26 ) located between the contact faces ( 9 , 14 ) of the permanent magnet ( 3 ) and the retaining elements ( 4 , 5 ), and wherein the disklike friction elements ( 26 ) or the retaining elements ( 4 , 5 ) have a steel face ( 28 , 29 ) coated with corundum or diamond, and wherein the coating of corundum or diamond is located between the permanent magnet ( 3 ) and the retaining elements.