Alternator for vehicle
First Claim
Patent Images
1. An alternator for a vehicle, comprising:
- a frame;
a stator fixed to the frame and having a stator iron core formed with a plurality of slots, the stator having a polyphase armature coil accommodated in the slots, the stator having ends in an axial direction of said core which are provided with coil end groups as sets of coil ends of the polyphase armature coil; and
a rotor opposing the stator;
whereinthe rotor has moving blades for providing a cooling medium toward the coil end groups;
the coil end groups include a plurality of stationary blade coil ends including;
first portions extending in axial directions from an outer layer of one of two said slots spaced from each other by a predetermined pitch;
second portions extending in axial directions from an inner layer of the other of the two slots; and
third portions located at axial-direction end portions of the coil end groups and extending radially to connect axial-direction end portions of the first portions and the second portions;
cooling medium passages are formed between the third portions of the stationary blade coil ends;
the third portions extend from ends of the second portions toward ends of the first portions, and extend in a radial direction and a circumferential direction of said core and incline in a direction of rotation of the moving blades from an inner side toward an outer side; and
the third portions form stationary blades cooperating with the moving blades of the rotor, which rotates together with the rotor, in axial-direction end surfaces of the coil end groups.
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Accused Products
Abstract
An alternator for a vehicle which maintains or improves the cooling performance and which reduces the fan noise caused by the interference between the cooling winds and the stator windings. An armature coil provided on a stator of the alternator includes an X-phase coil group, a Y-phase coil group, and a Z-phase coil group. Coil end groups are sets of coil ends forming bridge wires between slots. The coil end groups have stationary blade shapes which form passages for the cooling winds directed from a cooling fan on a rotor toward outlets in a frame. The sound of the interference between the cooling winds and the coil end groups is reduced while the cooling performance is enhanced.
163 Citations
26 Claims
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1. An alternator for a vehicle, comprising:
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a frame; a stator fixed to the frame and having a stator iron core formed with a plurality of slots, the stator having a polyphase armature coil accommodated in the slots, the stator having ends in an axial direction of said core which are provided with coil end groups as sets of coil ends of the polyphase armature coil; and a rotor opposing the stator;
whereinthe rotor has moving blades for providing a cooling medium toward the coil end groups; the coil end groups include a plurality of stationary blade coil ends including; first portions extending in axial directions from an outer layer of one of two said slots spaced from each other by a predetermined pitch; second portions extending in axial directions from an inner layer of the other of the two slots; and third portions located at axial-direction end portions of the coil end groups and extending radially to connect axial-direction end portions of the first portions and the second portions; cooling medium passages are formed between the third portions of the stationary blade coil ends; the third portions extend from ends of the second portions toward ends of the first portions, and extend in a radial direction and a circumferential direction of said core and incline in a direction of rotation of the moving blades from an inner side toward an outer side; and the third portions form stationary blades cooperating with the moving blades of the rotor, which rotates together with the rotor, in axial-direction end surfaces of the coil end groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An alternator for a vehicle, comprising:
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a stator including a stator iron core and a polyphase armature coil, the stator iron core having a plurality of slots, the polyphase armature coil being provided on the stator iron core and having coil end groups; and a rotor for generating a rotating magnetic field intersecting the stator, the rotor having moving blades;
whereinthe coil end groups include a plurality of stationary blade coil ends, the stationary blade coil end including; first portions extending in axial direction of said core from an outer layer of one of two said slots spaced from each other by a predetermined pitch; second portions extending in axial directions from an inner layer of the other of the two slots; and third portions located at axial-direction end portions of the coil end groups and extending radically to connect axial-direction end portions of the first portions and the second portions; passages for the cooling medium are formed between the third portions of the stationary blade coil ends; the third portions have a plate shape and extend from ends of the second portions toward ends of the first portions, and extend in a radial direction and a circumferential direction of said core and incline in the direction of rotation of the moving blades from an inner side toward an outer side; and the third portions form stationary blades cooperating with the moving blades of the rotor, which rotates together with the rotor, in axial-direction end surfaces of the coil end groups. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification