Abstract: Disclosed is a current supply arrangement for an electric machine rotor winding, comprising a slip ring made of a high-strength steel, fitted onto the rotor shaft with an electrically insulating layer therebetween, and adapted to be engaged by contact brushes of current collecting bars of the contact brush device. The slip ring is provided with a cylindrical recess cut in the end face thereof and disposed coaxially with the inner opening of said ring. The recess serves to receive a distributing ring made of a material having a high electrical conductivity, and provided with a current conducting bar secured thereto and electrically connected to the rotor winding by means of current conducting screws and a number of current supplying bars. The distributing ring is adapted to make electrical contact with the slip ring through an additional electrically conductive layer made of a homogeneous material and having a resistivity lower than that of the slip ring material.

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.