According to one embodiment, there is provided a gas cooled electric rotating machine in which a cooling gas is flowed through into a rotor and a stator. The rotor includes a pair of center hole conductors inserted into a center hole along a center of rotation while being electrically insulated from a shaft and from each other, the center hole conductors including respective protruding parts protruding toward an end of the shaft. The rotor includes a pair of end conductors provided at the end of the shaft so as to be each electrically insulated from the shaft, the end conductors being electrically connected to side surfaces of the protruding parts of the pair of center hole conductors, the side surfaces serving as electric connection surfaces.

A rotor for a rotating electric machine includes a rotor winding arranged for conjoint rotation on a rotor shaft, and a slip ring body arranged on an axial end of the rotor shaft and having an end face on an axial end of the slip ring body opposite to the rotor winding. The slip ring body includes connection adapters which project axially beyond the end face of the slip ring body for connection of line ends of the rotor winding. A driver unit for a rotary encoder is fastened to the end face of the slip ring body and/or to the axial end of the rotor shaft and electrically insulated from the connection adapters. A centrifugal force support ring is arranged on the end face of the slip ring body such that the connection adapters and the driver unit are arranged in a through-opening of the centrifugal force support ring.

A rotor for a rotating electric machine includes a rotor winding arranged for conjoint rotation on a rotor shaft, and a slip ring body arranged on an axial end of the rotor shaft and having an end face on an axial end of the slip ring body opposite to the rotor winding. The slip ring body includes connection adapters which project axially beyond the end face of the slip ring body for connection of line ends of the rotor winding. A driver unit for a rotary encoder is fastened to the end face of the slip ring body and/or to the axial end of the rotor shaft and electrically insulated from the connection adapters. A centrifugal force support ring is arranged on the end face of the slip ring body such that the connection adapters and the driver unit are arranged in a through-opening of the centrifugal force support ring.

According to one embodiment, a rotor of a rotating electric machine includes a collector shaft which is fastened to a main shaft of the machine and mounted with paired collector rings on an outer circumferential surface thereof. Longitudinal lead bars extend in electrically insulated state in longitudinal lead grooves provided in an outer circumferential surface of the collector shaft and are connected to ring through studs. Radial lead bars are located at a collector shaft-side end portion of the main shaft and connect at their inner end portions to the bands. And, both ends of conductive longitudinal studs inserted into longitudinal through holes at a main shaft-side end portion of the collector shaft are connected to outer end portions of the radial lead bars and to the longitudinal lead bars.

According to one embodiment, a rotor of a rotating electric machine includes a collector shaft which is fastened to a main shaft of the machine and mounted with paired collector rings on an outer circumferential surface thereof. Longitudinal lead bars extend in electrically insulated state in longitudinal lead grooves provided in an outer circumferential surface of the collector shaft and are connected to ring through studs. Radial lead bars are located at a collector shaft-side end portion of the main shaft and connect at their inner end portions to the bands. And, both ends of conductive longitudinal studs inserted into longitudinal through holes at a main shaft-side end portion of the collector shaft are connected to outer end portions of the radial lead bars and to the longitudinal lead bars.

A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core, an axial end part, and a rotor magnet inserted into an insertion hole formed so as to pass through the rotor core. The axial end part has a recessed portion. The rotor magnet includes a first side surface and a second side surface. The first side surface is fixed to a first inner wall surface of the insertion hole. In a cross section perpendicular to the axial direction, a width of the first inner wall surface is larger than a width of the first side surface. The second side surface is fixed to a second inner wall surface of the recessed portion. In the cross section perpendicular to the axial direction, a width of the second inner wall surface is larger than a width of the second side surface.

The invention relates to a rotor for an electric machine, comprising at least one first (22) and a second (32) conductor end and a contact element, which provides a connection between the at least two conductor ends (22, 32), and wherein the contact element can be positioned along a rotor axis (R) of the rotor in such a way that the connection can be established in an intermediate position, which is offset away from the rotor in relation to an end position of the contact element.

The invention relates to a rotor for an electric machine, comprising at least one first (22) and a second (32) conductor end and a contact element, which provides a connection between the at least two conductor ends (22, 32), and wherein the contact element can be positioned along a rotor axis (R) of the rotor in such a way that the connection can be established in an intermediate position, which is offset away from the rotor in relation to an end position of the contact element.

In an assembly for electrically exciting the rotor of an electrical machine, the wear of the sliding contacts is reduced in operating conditions with low current density in that an AC current is injected. The additional injection of the AC current is superimposed upon the DC current. The rotor poles function as an open circuit with respect to the AC current through a co-rotating capacitor.

In an assembly for electrically exciting the rotor of an electrical machine, the wear of the sliding contacts is reduced in operating conditions with low current density in that an AC current is injected. The additional injection of the AC current is superimposed upon the DC current. The rotor poles function as an open circuit with respect to the AC current through a co-rotating capacitor.