Abstract: A locking structure for the rotor end winding of a distributed polar electric machine comprises a retaining ring embracing the rotor end winding and fixed on the rotor body by a shrink fit, and a locking ring preventing the retaining ring from axial shift with respect to the rotor body. The locking ring embraces both the retaining ring and the rotor body within their connection area and is secured firmly against radial shift with respect to both of them by the shrink fit. Said locking ring has bayonet joint portions on its inner surface at one of the end faces thereof, and has a bead at its other end face, serving as a thrust for a ring key. Mating portions of the bayonet joint are provided on the outer surface of the retaining ring, while the ring key is located on the rotor body.

Abstract: A current supplying device comprises a slip ring mounted on a rotor shaft with an electrically insulating layer interposed therebetween, and contacting the brushes of the current collecting bus bars of the brush contact device of an electric machine. At least on one end of the slip ring a distribution ring is mounted to which a current supplying bus bar electrically connected with the rotor winding is secured and which contacts the slip ring through an additional electrically conductive layer formed of a material with a lower specific electric resistance than that of the material of the slip ring. Both the slip ring and the distribution ring are provided with through holes arranged around the circumference of these rings and having longitudinal axes parallel to longitudinal axes of these rings. Each one of the through holes of the slip ring corresponds to one of the through holes of the distribution ring and is coaxial therewith, so that they form an integral ventilating channel.

Abstract: An electric machine rotor end winding mounting shroud comprising a cylindrical shell having a thinned portion adjacent directly to the rotor body and provided with an inner annular recess at the edge region of the rotor body, whereby this cylindrical shell portion is made flexible, the cylindrical shell being cantilever-like arranged at the end portion of the rotor body.