Patent ID: 7893577

Claim:
A rotor for an electrodynamic machine comprising: a laminated core including a plurality of lamination segments arranged in series in an axial direction wherein the laminated core includes cooling ducts formed by duct spacers disposed between axially adjacent lamination segments, wherein the duct spacers are configured to resist centrifugal forces acting on the duct spacers and arc supported by axial bolts extending through the laminated core in the axial direction, wherein the at least one duct spacer is comprised of a plurality of individual parts at least partially axially adjacent to each other, and wherein the plurality of individual parts includes a first part and a second part, the first part including a perforated disk, and the second part having a second widened Section with a hole configured to receive the axial bolt and a second narrow section in a form of at least two radial fingers disposed circumferentially next to and spaced apart from each other, wherein the perforated disk and the second widened section axe disposed axially adjacent to each other.