Vehicle alternator and stator for vehicle alternator

Abstract

A vehicle alternator and a stator for the vehicle alternator are disclosed wherein a stator winding includes a plurality of base segments wound on slots of the stator, each of the base segments including a large segment and a small segment disposed in the same slots distanced from each other by one-pole pitch. The large and small segments have turning portions extending from one axial end of the stator to form coil ends, respectively, with the turning portions of the large and small segments being dislocated from each other in a circumferential direction of the stator core to provide a circumferential space to create a cooling wind flow path to pass cooling wind in a radial direction of the stator core.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a vehicle alternator of an embodiment according to the present invention.

FIG. 2 is a fragmentary cross sectional view showing a stator of the present embodiment according to the present invention shown in FIG. 1.

FIG. 3 is a perspective view showing a structure of a base segment forming a stator winding of the stator of the present embodiment;

FIG. 4 is a winding specification diagram of the vehicle alternator of the present embodiment according to the present invention.

FIG. 5 is a winding specification diagram of the vehicle alternator of the present embodiment according to the present invention.

FIG. 6 is a winding specification diagram of the vehicle alternator of the present embodiment according to the present invention.

FIG. 7 is a connection diagram of the vehicle alternator of the present embodiment according to the present invention.

FIG. 8 is a schematic view showing the positional relationship between turning portions of large and small segments disposed in the same slots of the stator of the present embodiment.

FIG. 9 is a schematic view of a modified form of the stator wherein the turning portions of the large and small segments disposed in the same slots have the same axial heights.

Claims

1. A stator for a vehicle alternator comprising: a stator core formed with a plurality of slots; anda multi-phase stator winding wound on the plurality of slots of the stator core and including a plurality of segments composed of electrical conductors that are joined to each other to form the stator winding;wherein the segments have inclined portions forming coil ends extending from an axial end face of the stator core;each of the segments includes a U-shaped large segment having a turning portion with a large size and a U-shaped small segment having a turning portion with a small size;the stator winding has a coil-end group, extending from one axial end face of the stator core, wherein the turning portion of the large segment and the turning portion of the small segment are dislocated from each other in a circumferential direction of the stator core and the turning portions of the large and small segments passing through the same slots overlap each other along an axial direction of the stator core.

2. The stator for the vehicle alternator according to claim 1, wherein: the turning portions of the large and small segments passing through the same slots have the same axial heights.

3. The stator for the vehicle alternator according to claim 1, wherein: the inclined portions of the segments have circumferential spaces forming cooling wind flow paths to pass cooling wind in a radial direction of the stator core.

4. The stator for the vehicle alternator according to claim 1, wherein: the small segment has a pair of straight portions disposed in one of the slots and the other one of the slots circumferentially distanced from the one of the slots by one pole-pitch, a pair of inclined portions axially extending outward from the axial end face of the stator core, and a turning portion integral with the pair of inclined portions to form a coil end;the large segment has a pair of straight portions disposed in the one of the slots and the other one of the slots circumferentially distanced from the one of the slots by one pole-pitch, a pair of inclined portions axially extending outward from the axial end face of the stator core, and a turning portion integral with the pair of inclined portions to form a coil end; andthe turning portions of the large and small segments are circumferentially dislocated from each other to provide a circumferential space to create a cooling wind flow path to pass cooling wind in a radial direction of the stator core.

5. A vehicle alternator comprising: a stator core formed with a plurality of slots and having a multi-phase stator winding, wound on the plurality of slots, which includes a plurality of segments composed of electrical conductors that are joined to each other to form the stator winding; anda rotor rotatably disposed in the stator core and having an end face carrying thereon a cooling fan for creating a cooling wind in a radial direction of the rotor;wherein the segments have inclined portions forming coil-ends extending from an axial end face of the stator core;each of the segments includes a U-shaped large segment having a turning portion with a large size and a U-shaped small segment having a turning portion with a small size; the stator winding has a coil-end group, extending from one axial end face of the stator core, wherein the turning portion of the large segment and the turning portion of the small segment are dislocated from each other in a circumferential direction of the stator core and the turning portions of the large and small segments passing through the same slots overlap each other along an axial direction of the stator core.

6. The vehicle alternator according to claim 5, wherein: the small segment has a pair of straight portions disposed in one of the slots and the other one of the slots circumferentially distanced from the one of the slots by one pole-pitch, a pair of inclined portions axially extending outward from the axial end face of the stator core, and a turning portion integral with the pair of inclined portions to form a coil end;the large segment has a pair of straight portions disposed in the one of the slots and the other one of the slots circumferentially distanced from the one of the slots by one pole-pitch, a pair of inclined portions axially extending outward from the axial end face of the stator core, and a turning portion integral with the pair of inclined portions to form a coil end; andthe turning portions of the large and small segments are circumferentially dislocated from each other to provide a circumferential space to create a cooling wind flow path to pass the cooling wind in the radial direction of the stator core.

7. The vehicle alternator according to claim 5, wherein: the turning portions of the large and small segments have axial heights different from each other.

8. The vehicle alternator according to claim 5, wherein: the inclined portions of the segments have circumferential spaces forming cooling wind flow paths to pass cooling wind in a radial direction of the stator core.