Patent ID: 8049393
Filing Date: 2011-11-01
Classification: H02K

Abstract:
1. A rotor for an electric machine comprising: a rotor yoke having a plurality of axial winding slots distributed on an outer periphery of the rotor yoke; a winding bar disposed in one of the plurality of axial winding slots, the winding bar having at least one winding end emerging axially from the rotor yoke so as to form an end winding; a retaining device including a plurality of radial bolts, each of the plurality of radial bolts having a head fixedly connected to a shank, the retaining device including a retaining strip extending in an axial direction against the end winding and the plurality of radial bolts being arranged in series in the axial direction and configured to press the retaining strip against the end winding, wherein the retaining device retains the end winding against a centrifugal force acting on the end winding; at least one hammer-shaped recess configured to receive at least one counter strip having a threaded hole configured to receive one of the plurality of radial bolts so as to fasten the respective bolt on an outer periphery of an axial extension of the rotor yoke, wherein the axial extension is disposed inside the end winding, and wherein each of the plurality of radial bolts associated with each retaining strip is screwed into a common counter strip; and a locking strip configured to lock the plurality of radial bolts against rotation, wherein each of the plurality of radial bolts include a recess with a rectangular locating face disposed on an inner end of each of the plurality of radial bolts, the locking strip being axially inserted into the recess and disposed against the rectangular locating face.