Rotor of rotary-electric machine
View Patent ↗In a rotor of a rotary-electric machine, in order to improve a cooling performance of a rotor winding, in a rotor winding on an end portion of the rotor in an axial direction, the rotor winding being held by a retaining ring of the rotor winding formed by laminating a plurality of conductors in slots of a rotor iron core extending in an axial direction and having a plurality of slots formed at predetermined intervals in a peripheral direction, ventilation channels through which cooling air flows are formed in the surfaces of the conductors along a longitudinal direction. The ventilation channels have air inlet holes which guide the cooling air and exhaust holes which exhaust the cooling air, the conductors provided with the ventilation channels which are formed in the surfaces of the conductors along the longitudinal direction and through which the cooling air flows are laminated to constitute the rotor winding, and the conductors include openings of the air inlet holes in bottoms of the conductors on a side opposite to a side on which the ventilation channels are formed.
1. A rotor of a rotary-electric machine comprising: a rotor iron core extending in an axial direction and having a plurality of slots formed at predetermined intervals in a circumferential direction; a rotor winding constituted by laminating and storing a plurality of conductors in each slot of said rotor iron core; and a retaining ring which covers and holds an end portion of said rotor winding in the axial direction, and said rotor winding being provided with ventilation channels on the surfaces of said conductors along a longitudinal direction and through which cooling air flows, said ventilation channels being provided with air inlet holes which introduce said cooling air and exhaust holes which exhaust the cooling air,
wherein said ventilation channels which are formed in the surfaces of said conductors along the longitudinal direction and through which cooling air flows are formed along the axial direction and along the circumferential direction halfway in an upper part of said rotor winding in a laminating direction of said conductors,
said ventilation channels are formed in the surfaces of said conductors in only the axial direction in a lower part of said rotor winding in the laminating direction of said conductors,
said ventilation channels include:
first air inlet holes of which openings are formed in bottoms of said conductors and which continuously extend in a diametric direction to communicate with end portions of said ventilation channels formed in the surfaces of said conductors along the circumferential direction; and
second air inlet holes of which openings are formed in the bottoms of said conductors and which continuously extend halfway in the diametric direction to communicate with end portions of said ventilation channels in the axial direction, said ventilation channels being formed in the surfaces of said conductors in only the axial direction, in a lower part of said rotor winding in the laminating direction of said conductors, and
as the exhaust holes which exhaust the cooling air flowing through said ventilation channels,
a path which communicates with the end portions of said ventilation channels in the axial direction, said ventilation channels being formed along the axial direction and the circumferential direction, in the upper part of said rotor winding in the laminating direction of said conductors; and
another path which communicates with the other end portions of said ventilation channels in the axial direction to extend through said conductors, the channels being formed in only the axial direction, in the lower part of the rotor winding in the laminating direction of the conductors, said paths being arranged independently of each other.
2. The rotor of the rotary-electric machine according to claim 1 , wherein said exhaust hole is omitted from said conductor positioned in a lowermost part of said rotor winding.