Patent ID: 8643248

Claim:
An electrical machine configured to operate at a power range of several MVA comprising: a rotor configured to rotate about an axis and including a rotor winding disposed in a rotor lamination stack and having an exposed winding head outside of the rotor lamination stack, wherein the winding head includes a winding head retention system including: a plurality of radially oriented retention elements each including a locking device configured to secure a respective one of the retention elements against at least one of an unintentional loosening and a flying away in an event of a breakage due to centrifugal forces, wherein the plurality of retention elements each include at least one of a threaded rod and a threaded bolt configured to extend through the winding head in a radial direction, an outer end of the at least one of the threaded rod and the threaded bolt including one of a nut and a screw head configured to support the winding head, wherein the locking device includes a wire locking device including a wire configured to stretch over the outside of at least one of the threaded bolt, threaded rod, nut and screw head, wherein the wire locking device is stretched circumferentially and is in close contact with the outside of at least one of the threaded bolt, threaded rod, nut and screw head.