Rotor assembly for an electric excited synchronous motor (EESM)

A rotor assembly for an electric excited synchronous motor (EESM), comprising:

• a rotor shaft,
• a rotor core connected to the rotor shaft and including a plurality of circumferentially distributed pole portions, with respective windings being received around the pole portions, wherein the windings have first winding ends that project axially from a first end face of the rotor core and, on the opposite side, second winding ends that project axially from a second end face of the rotor core;
• a first fluid guide element arranged at a first end of the rotor core;
• a second fluid guide element arranged at a second end of the rotor core;
• wherein the rotor shaft comprises an axial bore and, extending therefrom, a plurality of radial bores arranged in an axially central region of the rotor shaft;
• wherein the rotor core includes a plurality of inlet openings that are fluidically connected to the radial bores of the rotor shaft, and axial channels that extend from the inlet openings axially to first outlet openings at the first end face of the rotor core and to second outlet openings at the second end face of the rotor core;
• wherein the first fluid guide element is fluidically connected to the first outlet openings of the rotor core and comprises a fluid structure that is configured to receive cooling fluid from the first outlet openings of the rotor core and guide the cooling fluid to first escape openings arranged in circumferential direction between two circumferentially adjacent first winding ends;
• wherein the second fluid guide element is fluidically connected to the second outlet openings of the rotor core and comprises a fluid structure that is configured to receive cooling fluid from the second outlet openings of the rotor core and guide the cooling fluid to second escape openings arranged in circumferential direction between two circumferentially adjacent second winding ends;
• and
• wherein at least one of the first fluid guide element and the second fluid guide element is made of a non-conducting material that is different from a material of the rotor core.

A rotor assembly for an electric excited synchronous motor (EESM), comprising:

• a rotor shaft,
• a rotor core connected to the rotor shaft and including a plurality of circumferentially distributed pole portions, with respective windings being received around the pole portions, wherein the windings have first winding ends that project axially from a first end face of the rotor core and, on the opposite side, second winding ends that project axially from a second end face of the rotor core;
• a first fluid guide element arranged at a first end of the rotor core;
• a second fluid guide element arranged at a second end of the rotor core;
• wherein the rotor shaft comprises an axial bore and, extending therefrom, a plurality of radial bores arranged in an axially central region of the rotor shaft;
• wherein the rotor core includes a plurality of inlet openings that are fluidically connected to the radial bores of the rotor shaft, and axial channels that extend from the inlet openings axially to first outlet openings at the first end face of the rotor core and to second outlet openings at the second end face of the rotor core;
• wherein the first fluid guide element is fluidically connected to the first outlet openings of the rotor core and comprises a fluid structure that is configured to receive cooling fluid from the first outlet openings of the rotor core and guide the cooling fluid to first escape openings arranged in circumferential direction between two circumferentially adjacent first winding ends;
• wherein the second fluid guide element is fluidically connected to the second outlet openings of the rotor core and comprises a fluid structure that is configured to receive cooling fluid from the second outlet openings of the rotor core and guide the cooling fluid to second escape openings arranged in circumferential direction between two circumferentially adjacent second winding ends;
• wherein a first end ring is provided at the first side of the rotor core and a second end ring is provided at the opposite second side, wherein the first end ring and the second end ring are clamped axially against each other by a plurality of clamping elements respectively extending between two circumferentially adjacent windings;
• and
• wherein at least one of the first end ring and the second end ring comprises a flange portion for supporting the clamping elements and a jacket portion surrounding the end windings, wherein the end ring comprises a plurality of outlet openings.