JP2000295826A - Ac generator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the cooling property of a stator winding. SOLUTION: Oblique parts 26 and 126, which extend toward the turn parts 28 and 128 from the straight parts of two pieces of conductor segments 23 and 123 being arranged in piles in the circumferential direction of rotation inside or outside one slot, are arranged aslant in the same direction in the circumferential direction of rotation. Besides, the coupling position between the oblique part 126 of one conductor segment 123 and the straight part is set in a position more apart from the end face of the stator iron core 22 than the coupling position between the oblique part 26 of the other conductor segment 23 adjoining the one to circumferential direction and the straight part. Therefore, large space S1 is made between one oblique part 26 and the other oblique part 126.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator mounted on a passenger car, a truck and the like.

[0002]

2. Description of the Related Art As a stator used in an automotive alternator, a stator having a winding formed by joining a plurality of conductor segments is conventionally known. For example, WO92 / 06527 discloses a stator in which a plurality of U-shaped conductor segments are inserted from one end face side of a stator core, and then the opposite ends are joined together to form a stator. Is disclosed. This stator has a feature that a regularly arranged winding can be easily formed as compared with a case where a winding is formed by winding a continuous conductor winding. Similarly, assuming that a winding is formed using a U-shaped conductor segment, WO98 / 5482
The vehicle alternator disclosed in No. 3 is known.

[0003]

By the way, the above-mentioned W
In the alternator for a vehicle disclosed in O92 / 06527, a total of four conductors, two in the inner layer and two in the outer layer, are accommodated in each slot of the stator. The two conductors on the inner layer are skewed in the predetermined circumferential direction, and the two conductors on the outer layer are skewed on the opposite side to the conductor on the inner layer. Therefore, in each of the inner layer and the outer layer, the conductor is bent in units of two, so that only a small gap is formed between the two conductors bent in the same direction, and through the gap portion, There is a problem that the cooling air is difficult to flow and that the electrolyte or the like easily stays in the small gap.

In recent years, in particular, the entire engine and electrical components have come closer to the road surface due to the slant nose for reducing the running resistance of the vehicle and improving the field of view, and the conditions of water splashing from the tires during running have become severe. Further, in cold regions, a large amount of salt is sprayed for the purpose of preventing roads from freezing in winter, so that salt or water containing salt is involved during traveling, and the engine room is subjected to more severe corrosive environmental conditions. I have. In addition, car shampoo and the like used in steam cleaning in an engine room are also electrolytes. As described above, since the vehicular generator is exposed to the above-mentioned harsh environment, the power generation is likely to be stopped due to corrosion by water or electrolyte such as salt.

[0005] The process for stopping power generation is as follows. In other words, when the electrolyte such as water or salt repeatedly reaches the coil end of the stator, the coil film causes corrosion deterioration such as hydrolysis, causing an electric short circuit between the coils, and the copper wire due to local heat generation. , And eventually leads to coil disconnection. In particular, in the case of an internal fan type vehicle alternator having a cooling fan in the frame, the electrolyte such as water or salt taken in together with the cooling air reaches so as to be beaten to the inner periphery of the coil end, Since the cooling air discharge ventilation passage is provided in the frame near the coil end, when the engine is stopped, that is, when the inside of the engine room is cleaned while the vehicle alternator is stopped rotating, the exhaust ventilation passage passes through the discharge ventilation passage. Since the electrolyte such as a car shampoo easily reaches the outer periphery of the coil end, the above-described problem is likely to occur.

[0006] On the other hand, with an increase in electric loads of safety control devices and the like mounted on vehicles, generators for vehicles are required to have higher and higher output. Needless to say, cost reduction is required.

On the other hand, like a vehicle alternator disclosed in Japanese Patent Application Laid-Open No. Hei 3-235644, a drip-proof cover is mounted on the cooling air intake side to cut off the entrance path of water from the outside. There is a prior art to do. By using the drip-proof cover disclosed in this publication, it is possible to prevent the electrolyte from being mixed with the cooling air taken into the inside by the rotation of the cooling fan to some extent, but the coil end is provided by the ventilation provided in the radial direction of the frame. Since it is located near the window, when the rotation is stopped, water, salt water, and the like from the radial outside of the generator can easily reach the coil end and stay there. To prevent this, it is conceivable to attach a drip-proof cover also to the outside of the ventilation window provided in the radial direction of the frame, but in this case, the ventilation resistance increases, the cooling air volume decreases, and the hot air after cooling Evacuation is hindered, and the temperature of the entire generator rises significantly. This is not an effective measure in view of the demand for higher output and improved durability. Further, the addition of the drip-proof cover is not preferable because the manufacturing cost for parts and assembly increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the cooling performance of a stator winding and to prevent an electrolyte or the like from remaining in the stator winding. It is an object of the present invention to provide a vehicle alternator capable of preventing the occurrence of an electric current.

It is another object of the present invention to increase the space factor of the stator windings in the slot to achieve high output and to reduce the manufacturing cost.

[0010]

According to the first aspect of the present invention, a stator of an automotive alternator includes a stator core having a plurality of slots, and a plurality of conductors housed in the slots. And a straight portion which is accommodated in the slot which is spaced apart corresponding to the NS magnetic pole pitch of the rotor, and a slant portion which connects the straight portion outside the slot. A row portion, and in the slot, the skew portions connected to the plurality of linear portions adjacent to each other are inclined in the same circumferential direction, and the skew portions are mutually aligned along the rotation axis direction. They are placed apart.

Thus, even if water droplets of the electrolyte containing salt or the like reach the coil end formed by the oblique portion, they are discharged to the outside together with the cooling air passing through the gap between the conductor segments separated from each other. Therefore, it is possible to prevent stagnation of water droplets of the electrolyte, and it is possible to suppress corrosion of the film and a final disconnection failure. In addition, the cooling performance can be improved by passing the cooling air through the gap.

According to the invention described in claim 2, the plurality of skewing portions inclined in the same circumferential direction correspond to the different heights at different heights along the rotation axis direction from the end face of the stator core. It is connected to the straight section. Because the straight section is housed in the slot, a high space factor can be maintained, and the position where the straight section and the sloping section are connected is
Due to the difference in adjacent conductor segments,
The gap between the conductor segments at the coil end can be reliably provided.

According to the third aspect of the present invention, the conductor segment is formed such that each of the plurality of linear portions located in the slot has a substantially rectangular cross-sectional shape along the shape of the slot. Is formed. Accordingly, the conductor segments can be inserted and accommodated along the slots, and a high space factor can be easily realized.

According to the invention described in claim 4, the above-mentioned conductor segment is a substantially U-shaped conductor having two straight portions, and the U-shaped conductor is provided on one end face side of the stator core. The end of the U-shaped conductor is disposed on the other end face side, and the ends of the two conductor segments accommodated in the two slots spaced apart in correspondence with the NS pole pitch. The parts are joined. Thus, the stator winding can be formed only by performing the insertion of the conductor segment from one end side of the stator core and by joining the other, and the winding forming process can be performed more efficiently. Thus, the manufacturing cost can be reduced.

According to a fifth aspect of the present invention, the above-described conductor segment is formed in a shape without a turn portion so as to have two ends protruding from both sides of the slot, and the stator core is formed. On both end face sides, the ends of the two conductor segments accommodated in the two slots spaced apart corresponding to the NS magnetic pole pitch are joined. Thereby, the shape of the conductor segment can be simplified, so that the manufacturing process of the conductor segment itself can be simplified and the manufacturing cost can be reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle AC generator according to an embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of an automotive alternator according to this embodiment. The vehicle alternator 1 shown in FIG. 1 includes a stator 2, a rotor 3, a frame 4, a rectifier 5, and the like.

The stator 2 includes a stator core 22 and two types of conductor segments 23 and 123 constituting a stator winding 21.
And an insulator 24 for electrically insulating between the stator core 22 and each of the conductor segments 23 and 123. The detailed structure of the stator 2 will be described later.

The rotor 3 includes a field winding 31 formed by winding an insulated copper wire in a cylindrical and concentric manner, each of which has a length of 6 mm.
The rotation axis 33 is provided by the pole core 32 having the claw portions.
Has a structure sandwiched from both sides. Also,
A cooling fan 35 for discharging the cooling air sucked in from the front side in the axial direction and the radial direction is attached to the end face of the pole core 32 on the front side by welding or the like. Similarly, a cooling fan 36 for discharging the cooling air sucked from the rear side in the radial direction is attached to an end face of the pole core 32 on the rear side by welding or the like. In the vicinity of the rear end of the rotating shaft 33, two slip rings 37 electrically connected to both ends of the field winding 31,
38 are formed, and these slip rings 37,
Power is supplied from the brush device 7 to the field winding 31 via 38.

The frame 4 houses the stator 2 and the rotor 3, the rotor 3 is supported rotatably about a rotation shaft 33, and the outer periphery of the pole core 32 of the rotor 3. Is fixed to the stator 2 disposed with a predetermined gap therebetween. The frame 4 has a discharge window 41 for cooling air at a portion facing the coil end of the stator winding 21 protruding from the axial end face of the stator core 22, and has a suction window 42 at the axial end face. ing.

AC generator 1 for vehicle having the above structure
When a rotational force from an engine (not shown) is transmitted to the pulley 20 via a belt or the like, the rotor 3 rotates in a predetermined direction. In this state, by applying an excitation voltage to the field winding 31 of the rotor 3 from the outside, the respective claw portions of the pole core 32 are excited, and NS magnetic poles are formed alternately along the rotation circumferential direction of the rotor 3. Therefore, a three-phase AC voltage can be generated in the stator winding 21, and a predetermined DC current is extracted from the output terminal of the rectifier 5.

Next, details of the stator 2 will be described.
FIG. 2 is a partial cross-sectional view of the stator 2. As shown in FIG. 2, the stator core 22 has a plurality of slots 25, and each slot 25 accommodates a multi-phase stator winding 21. In the present embodiment, 36 slots 25 are arranged at equal intervals in the circumferential direction of rotation so as to accommodate the three-phase stator windings 21 corresponding to the number of magnetic poles of the rotor 3. Further, each of the plurality of slots 25 accommodates four electric conductors. The four electric conductors in one slot 25 are arranged in two rows in each of the radial direction (depth direction) and the circumferential direction of the stator core 22.

FIG. 3 is a perspective view showing the detailed shape of one conductor segment 23 constituting the stator winding 21. As shown in FIG. FIG. 4 is a perspective view showing the detailed shape of the other conductor segment 123 constituting the stator winding 21.

One conductor segment 23 shown in FIG.
The conductor is formed in a U-shape having a substantially rectangular cross section in which the conductor is turned at the turn portion 28, and the straight portions 23a and 23b housed in the slot 25 and the outer portions are arranged outside the slot 25 and extend along the circumferential direction of rotation. And a sloping portion 26 that is inclined. In this conductor segment 23, the end opposite to the turn portion 28 is welded to the other end of the conductor segment 23 housed in another slot 25 which is separated according to the NS magnetic pole pitch of the rotor 3. The joining portion 27 is used for joining by the method described above. Thus, the conductor segment 23 has two straight portions 23a, 2
3b, and one straight portion 23a is
5 is one of the electric conductors disposed on the inner layer side in the slot 25 shown in FIG. Further, the other straight portion 23b is arranged on the outer layer side of the slot 25, and serves as one electric conductor arranged on the outer layer side in the counterclockwise direction in the slot 25 shown in FIG.

In FIG. 2, the two straight portions 23a and 23b accommodated in one slot 25 are
, And corresponds to two different conductor segments 23 accommodated in the respective slots 25 spaced apart in correspondence with the NS magnetic pole pitch, and one of the straight portions is denoted by reference numeral 23b '. In FIG. 3, “X” is the length of each of the linear portions 23 a and 23 b in the rotation axis direction. "Y1"
Is the length along the rotation axis direction of the skewed portion 26 from the straight portion 23a on the inner layer side to the joining portion 27, and "Y2" is the slope from the straight portion 23b on the outer layer side to the joining portion 27. The length of the row portion 26 along the rotation axis direction. “Z1” is the length along the rotation axis direction of the oblique portion 26 from the straight portion 23a on the inner layer side to the turn portion 28, and “Z2” is the length from the straight portion 23b on the outer layer side to the turn portion 28. Is the length along the rotation axis direction of the skewing portion 26.

Similarly, one conductor segment 123 shown in FIG. 4 is formed in a U-shape having a substantially rectangular cross section in which a conductor is folded at a turn portion 128, and has a straight portion 123 a accommodated in the slot 25. , 123b, and a skew portion 126 disposed outside the slot 25 and inclined along the rotational circumferential direction. In the conductor segment 123, the end opposite to the turn 128 is a joint 127 used to join the ends of the conductor segments 123 housed in different slots 25 by welding or the like. As described above, the conductor segment 123 includes the two linear portions 123a and 123b, and one of the linear portions 123a is disposed on the inner layer side of the slot 25, and the inner layer side of the slot 25 shown in FIG. Is the other electric conductor disposed on the clockwise side of the other. Further, the other straight portion 123b is arranged on the outer layer side of the slot 25, and serves as the other electric conductor arranged on the outer layer side in the clockwise direction in the slot 25 shown in FIG.

In FIG. 2, the two straight portions 123a and 123b accommodated in one slot 25 correspond to different conductor segments 123, and therefore, one of the straight portions is denoted by reference numeral 123b '. It is attached and shown.
In FIG. 4, “X” indicates the straight line portions 123 a and 123.
b is the length in the rotation axis direction. “Y1” is a skewed portion 126 from the outer-layer-side straight portion 123b to the joining portion 127.
Is the length along the rotation axis direction, and “Y2” is the skewed portion 1 from the straight portion 123a on the inner layer side to the joining portion 127.
26 is a length along the rotation axis direction. “Z1” is the length along the rotation axis direction of the oblique portion 126 from the straight portion 123b on the outer layer side to the turn portion 128, and “Z2”
Is the length along the rotation axis direction of the oblique portion 126 from the straight portion 123a on the inner layer side to the turn portion 128.

As described above, in this embodiment, the two conductor segments 23 and 123 which are arranged side by side in one slot in the circumferential direction are formed at a portion extending from one axial opening end of one slot 25. Has different shapes. A description will be given focusing on the shape of the conductor segment at the axial opening end of any one slot 25. One of the conductor segments is bent immediately after extending from the end face of the stator core 22, and is connected to the oblique portion. The other conductor segment extends straight from the end face of the stator core 22 by a predetermined length P and is bent to be connected to the oblique portion. In addition, the other conductor segment is located behind the one conductor segment in the inclined direction with respect to the circumferential direction in which the inclined portions 26 and 126 of the two conductor segments extend inclining. For this reason, gaps S1 and S2 are formed between the two skewed portions 26 and 126 formed by the two conductor segments, and are determined by the protrusion amount P and the inclination angles of the skewed portions 26 and 126. You.

In this embodiment, the two conductor segments 23 and 123 which are arranged side by side in one slot 25 in the circumferential direction are formed on one end face and the other end face of the stator core 22 in the circumferential direction, respectively. In the opposite direction. For this reason, the two conductor segments 23, 1 arranged side by side in the circumferential direction in one slot 25
One of the conductor segments 23 is connected to the oblique portion 26 immediately after coming out of the slot 25 at one axial end face opening of the one slot 25, but is connected to the one slot 25.
At the other axial end face opening, a straight line extends a predetermined length P from the slot 25 and is then connected to the skewing portion 26. Further, the remaining conductor segment 123 is linearly extended by a predetermined length P from the slot 25 at one axial end face opening of one slot 25, and then the skewed portion 126 is formed.
However, at the opening in the other axial end face of one slot 25, it is connected to the skewing portion 126 immediately after exiting the slot 25. Therefore, one conductor segment 23 is axially positioned at one axial opening end of one slot 25, and the other conductor segment 123 is axially positioned at the other axial opening end of one slot 25. Is carried out so that both conductor segments 23, 123
Are both axially positioned in one slot 25.

Further, in this embodiment, since one conductor segment is formed in a U-shape, one conductor segment extends from each of the four axially open ends of the two slots 25. Therefore, conductor segments are formed at these four locations so as to have the protrusion amount P as described above. As a result, in this embodiment, at the axially open ends of all the slots 25, the two conductor segments extend with the protrusion amount P as described above.

Moreover, the extending portions from the four slots 25 included in one U-shaped conductor segment are formed such that the diagonally extending extending portions have the same shape. Therefore, one U-shaped conductor segment is positioned without being shifted in the axial direction with respect to the stator core 22.

FIG. 5 shows a case where the conductor segment is the stator core 22.
It is a perspective view showing the state equipped with. FIG. 6 is an external view of the stator 2. As described above, one straight portion 23a of the conductor segment 23 and one straight portion 123a of the conductor segment 123 are arranged on the inner layer side in the same slot 25 so as to overlap with each other along the rotational circumferential direction. From the straight portions 23a, 123a to the turn portions 28, 1
The skewed portions 26 and 126 extending toward 28 are formed in the same direction along the rotational circumferential direction. In addition, when viewed from the inner diameter side, the connection position between the skewing portion 26 and the linear portion 23a of one conductor segment 23 disposed on the left side along the circumferential direction is determined by the other conductor segment 123 disposed on the right side.
Is set at a position farther from the end face of the stator core 22 than the connecting position of the skewed portion 126 and the straight portion 123a.
3 and 4, the hatched area indicates the position of the stator core 22 in the rotation axis direction, and the connecting position of the skewed portion 126 on the turn portion 128 side of the conductor segment 123 and the straight portion 123a is the stator. While the axial position of the core 22 coincides with the axial end surface position, the connecting position between the sloping portion 26 on the turn portion 28 side of the conductor segment 23 and the linear portion 23 a is determined from the axial end surface position of the stator core 22. At a distance of. Therefore, one skewing portion 126 and the other skewing portion extending from the inner layer side in each slot 25 of the stator core 22 toward the turn portions 28 and 128 and disposed near the end face of the stator core 22 are arranged. 26, a large gap S1 is formed as shown in FIG.

Similarly, the oblique portions 26, 126 extending from the straight portions 23a, 123a toward the joining portions 27, 127, respectively.
Are formed in the same direction along the rotational circumferential direction. In addition, the skewed portion 126 and the straight portion 1 of one conductor segment 123 disposed on the right side along the circumferential direction when viewed from the inner diameter side
The connecting position of 23a is set at a position farther from the end face of the stator core 22 than the connecting position of the skewed portion 26 and the linear portion 23a of the other conductor segment 23 arranged on the left side. Therefore, one of the oblique portions 2 that extends from the inner layer side in each slot 25 of the stator core 22 toward the joints 27 and 127 and is disposed on the side closer to the end face of the stator core 22.
6, a large gap S2 is formed between the skewed portion 126 and the other skewed portion 126, as shown in FIG.

In the above description, each slot 25
Attention has been paid to the straight portions 23a, 123a housed on the inner layer side and the skewing portions 26, 126 connected to these, but the straight portions 23b, 12 housed on the outer layer side in each slot 25 are focused on.
The same applies to 3b and each of the skewing portions 26 and 126 connected thereto. That is, one skewing portion 26 and the other skewing portion extending from the outer layer side in each slot 25 of the stator core 22 toward the turn portions 28 and 128 and disposed on the side close to the end face of the stator core 22. 126, a large gap S1 is formed. Also, one skewing portion 126 and the other skewing portion extending from the outer layer side in each slot 25 of the stator core 22 toward the joining portions 27 and 127 and disposed near the end face of the stator core 22 are provided. 26, a large gap S2 is formed.

The procedure for forming the stator winding 21 using the above-described conductor segments 23 and 123 is as follows. First, two types of conductor segments 23 ', 1' in a state where the skewing portions 26, 126 on the joint portions 27, 127 side as shown by dotted lines in FIGS. 3 and 4, respectively, are not formed.
23 'is prepared. And these conductor segments 2
3 ', 123' turn portions 28, 128 and each straight portion 23
While holding a, 23b, 123a, and 123b, these are inserted into two slots 25 of the stator core 22 separated by a magnetic pole pitch from the direction of the rotation axis while being superposed in the circumferential direction. At this time, the skewed portion 26 on the turn portion 28 side of the conductor segment 23 and the turn portion 128 of the conductor segment 123
A gap S1 shown in FIG. 6 is formed between the side skewing portions 126.

After this insertion operation, the outer ends of the conductor segments 23, 123 protruding from one end face of the stator core 22 are bent in a predetermined circumferential direction to form a gap S2 shown in FIG. The oblique portions 126 and 26 on the outer layer side are formed as described above. At the same time or before or after this step,
Ends of the conductor segments 23 and 123 protruding from one end face of the stator core 22 on the inner layer side are bent in a circumferential direction opposite to the outer layer side, and are formed on the inner layer side so as to form a gap S2 shown in FIG. The skew portions 26 and 126 are formed. In addition, the formation of the skewed portions 26 and 126 is performed by the respective conductor segments 23 and
This is performed by inserting a shaping jig corresponding to the gap S2 between the gaps 123.

As a result, as shown in FIG. 6, the skewed portions 26, 12 of the inner layer forming the coil ends of the stator winding 21 are formed.
6 and the oblique portions 26 and 126 of the outer layer are arranged so as to be inclined in opposite directions along the circumferential direction, respectively. After that, according to the winding specification diagram shown in FIG. 7, the reverse crossover 331 is arranged at the coil end on the turn portion 28, 128 side, and then the inner layer joints 27, 127 or the outer layer joint 27,
127 are electrically connected by welding, soldering, or the like, and the stator winding 21 having four electric conductors per slot 25 is formed.

As described above, in the automotive alternator 1 of the present embodiment, as shown in FIG. 6, at each coil end of the stator winding 21, between two conductor segments extending from the same slot, In addition, a predetermined gap can be secured along the rotation axis direction. Therefore, even if an electrolyte such as salt water or car shampoo reaches the coil end, the electrolyte is discharged together with the cooling air in the centrifugal direction by the internal cooling fans 35 and 36 through this gap, so that stagnation can be prevented. It is possible to prevent disconnection failure or the like due to corrosion of the coil end caused when the coil end is made. In addition, since the conductor segments forming the coil end are spaced apart from each other by the gap described above, the cooling performance of the coil end can be improved.

Further, as shown in FIG. 2, by forming the cross section of each of the conductor segments 23 and 123 into a rectangular shape, the space factor in the slot 25 can be increased. Value can be reduced and the power generation capacity can be improved. Moreover, by using the conductor segments 23 and 123 without using the continuous winding, in addition to the above-described high space factor, the process of forming the gap between the coil ends can be simplified, and the manufacturing cost of the stator 2 can be reduced. Can be reduced.

In the above-described embodiment, the electric conductors accommodated in the slots 25 are two rows in the depth direction (inner layer and outer layer) and two rows in the rotating circumferential direction. Although the case where the electric conductors are accommodated in the slot 25 has been described, the number of electric conductors in the depth direction or the rotational circumferential direction of the slot 25 may be changed according to the required output or the like.

Further, in the above-described embodiment, the U-shaped conductor segments 23 and 123 are used. However, as shown in FIG.
23 from the axial direction of the stator core.
3h may be aligned and inserted, and the inserted distal end may be inclined in a predetermined circumferential direction. In this case, in a plurality of conductor segments that are accommodated in the same slot and whose skewed portions are inclined in the same circumferential direction, the positions of the connecting portions of the linear portions 223h and the skewed portions in the rotation axis direction are shifted from each other. The gaps S1 and S2 as shown in FIG. 6 can be secured. Further, since the shape of the conductor segment 223 is simpler than that of the U-shape, the manufacturing process of the conductor segment itself is simplified, and the manufacturing cost of the stator can be reduced.

In the above-described embodiment, each of the slots 25 of the stator core 22 as shown in FIG. ′, And then shaping the distal end of the insertion into the conductor segments 23, 12 shown in FIGS.
9 is completed. As shown in FIGS. 9 and 10, by forming a protruding portion 130 or 132 along the radial direction at each tooth tip end portion 124 of the stator core 122, the inner circumference of the slot 125 is formed. The circumferential width of the side opening may be set to be the same as the circumferential width inside the slot 125. When such a stator core 122 is used, U-shaped or J-shaped conductor segments 23, 123
After the insertion, the protrusion 130 of each tooth tip 124,
Before being housed in the slot 125, the conductor segment 2 having skewed portions in both the turn portion and the anti-turn portion as shown in FIGS.
3, 123 can be manufactured, and the manufacturing process can be simplified as compared with the case where the gaps S1 and S2 are formed by inserting into each slot of the stator core and then shaping. After the conductor segments 23 and 123 are inserted into the slots 125, the conductor segments 23 and
3 can be deformed in accordance with the slot shape.
It is possible to improve the output by increasing the space factor in 5.

The segment shape having the protrusion amount P may be formed only in a part of the axial openings of the plurality of slots formed in the stator core 22.

For example, it may be formed only at the opening of the slot 25 on one end face of the stator core 22. Such a configuration is effective when a particularly high heat dissipation property is desired to be realized at the coil end formed on one end face of the stator core 22. Further, the same shape may be adopted only in every other opening among the openings of the slots arranged in the circumferential direction.
Such a configuration is effective when it is desired to form a ventilation path with a required density at the coil end and to improve the heat radiation as a whole, while obtaining advantages such as ease of processing in the processing step.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a vehicle alternator according to an embodiment.

FIG. 2 is a partial sectional view of a stator.

FIG. 3 is a perspective view showing a detailed shape of one conductor segment constituting a stator winding.

FIG. 4 is a perspective view showing a detailed shape of another conductor segment forming a stator winding.

FIG. 5 is a perspective view showing a state where a conductor segment is mounted on a stator core.

FIG. 6 is an external view of a stator.

FIG. 7 is a winding specification diagram of a stator.

FIG. 8 is a perspective view showing another example of the conductor segment.

FIG. 9 is a partial sectional view showing a modified example of the stator.

FIG. 10 is a partial sectional view showing another modification of the stator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle alternator 2 Stator 3 Rotor 4 Frame 21 Stator winding 22 Stator core 23, 123 Conductor segment 24 Insulator 25 Slot

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 5H603 AA09 AA11 BB02 BB07 BB09 BB12 CA01 CA05 CB03 CC05 CC07 CD02 CD06 CD22 CE05 EE11 5H609 BB05 BB13 BB18 PP02 PP06 PP09 QQ02 QQ12 QQ13 RR03 RR16 RR27 RR33 RR33 RR33 RR33 RR33 RR33 RR33 RR33 RR33 SS04 5H619 AA01 AA05 AA11 AA13 BB02 BB06 BB17 PP01 PP14

Claims (5)

[Claims] 1. A rotor having NS magnetic poles formed alternately along a rotational circumferential direction and having a fan at at least one of both axial ends, a stator disposed to face the rotor, A vehicle alternator having a stator and a frame supporting the stator, wherein the stator has a stator core having a plurality of slots,
And a plurality of conductor segments housed in the slot, wherein each of the conductor segments is the N of the rotor.
A straight portion accommodated in the slot separated in accordance with the S magnetic pole pitch, and a skewed portion connecting the straight portion outside the slot; An alternating current generator for a vehicle, wherein the skewed portions connected to the respective linear portions are inclined in the same circumferential direction, and the skewed portions are arranged apart from each other along the rotation axis direction. 2. The device according to claim 1, wherein the plurality of sloping portions inclined in the same circumferential direction are connected to the corresponding linear portions at different heights along an axis of rotation from an end face of the stator core. AC generator for vehicles. 3. The conductor segment according to claim 1, wherein each of the plurality of linear portions located in the slot has a substantially rectangular cross-sectional shape along the shape of the slot. AC generator for vehicles. 4. The conductor segment according to claim 1, wherein the conductor segment is a substantially U-shaped conductor having two straight portions, and the U-shaped conductor is provided on one end face side of the stator core.
A turn portion of a U-shaped conductor is arranged, and the U
An end portion of the V-shaped conductor is arranged, and the end portions of the two conductor segments accommodated in the two slots separated according to the NS magnetic pole pitch are joined. Alternator. 5. The stator according to claim 1, wherein the conductor segment has two ends protruding from both sides of the slot, and the NS is provided on both end faces of the stator core. An alternator for a vehicle, wherein the end portions of two conductor segments housed in two of the slots separated according to a magnetic pole pitch are joined.