JPH11164504A - Ac generator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sharply reduce fan noises generated by interference between cooling wind and a stator winding, while cooling performance is maintained and improved. SOLUTION: An armature coil 50 formed into a stator 40 of an AC generator for a vehicle containing an X-phase coil group 51, a Y-phase coil group 52 and a Z-phase coil group 53 as a three-phase AC generator. A coil end group is an assemblage where a plurality of coil ends as the crossover between slots are gathered. The coil end group constitutes stationary vanes to form the channel of cooling wind from the cooling fan of a rotor toward the outlet of a frame, and improves cooling performance, while reducing the interference noise of the cooling wind and the coil end group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator.

[0002]

2. Description of the Related Art Conventionally, a fan is provided on a rotor end face located radially inward of a coil end of an armature coil protruding on both sides of a stator core, and the air flow of the fan is provided. In an internal fan type vehicle alternator that cools the coil end, the gap between the fan and the coil end is quite narrow, and the wind pressure generated by the fan blades acts on the generator to easily generate fan noise. Met.

In particular, the coil end group of the armature coil has, as shown in FIG. 18 and FIG. 19, an irregular shape having a constant pitch due to interference between phases in the circumferential direction.
There is a problem that noise of a predetermined audible frequency is generated, and both the fan noise overall (hereinafter abbreviated as OA) and the pitch noise component are large. Japanese Patent Publication No. 4-24939 discloses a method in which a radial gap is provided between coil end groups of units for each phase wound around a predetermined stator slot to allow cooling air generated by a cooling fan to pass in a circumferential direction. It has been known.

Japanese Patent Application Laid-Open No. 55-157948 discloses a device in which at least two split coils are provided for each phase and inserted to reduce unevenness on the inner peripheral surface of the slot. Further, Japanese Unexamined Patent Application Publication No. 4-79742 discloses a coil end group formed by two sets of three-phase armature windings, which is wound so as to have an irregular pitch.

However, in any case, the inner peripheral surface of the coil formed by the coil end group is not uniform, and the coil ends are not separated from each other. Therefore, the level of cooling air pressure generated by a fan or the like, that is, a so-called breathing state occurs, so that reduction of fan noise is insufficient.

[0006] With respect to Japanese Patent Publication No. Hei 4-24939,
The gap in the radial direction is only ensured at a pitch in which the three-phase coil end group is a set of units, and is insufficient to suppress interference. In Japanese Patent Application Laid-Open No. 55-157948, although the irregularities on the inner peripheral surface of the coil can be suppressed, the generation of interference noise itself is insufficient.

[0007] With respect to Japanese Patent Application Laid-Open No. 4-79742,
It was possible to change the frequency of audible noise by changing the arrangement pitch of the unevenness, but it was insufficient to reduce the noise itself due to interference. There is also a method of reducing the fan noise by increasing the size of the generator body and conversely reducing the size of the cooling fan. However, it goes without saying that not only the size but also the cooling capacity of the fan decreases.

The present invention has been made in view of the above-mentioned problems, and provides an automotive alternator that maintains and improves cooling performance and significantly reduces fan noise generated by interference between cooling air and an armature coil. Is the task to be solved.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention forms a stationary vane shape in a coil end group to make the flow of a cooling medium more efficient and improve the cooling performance. A stator core fixed to a frame and having a plurality of slots, and a polyphase armature coil housed in the slot, wherein a plurality of the polyphase armature coils are provided at an axial end of the stator core. A stator having an annular coil end group formed as an assembly of coil ends, and a rotor arranged opposite to the stator, and a stator blade shape formed by the coil ends in the coil end group. Is formed, and a passage for a cooling medium is formed between the plurality of stationary blade shapes formed by the plurality of coil ends. be able to.

[0010] According to this configuration, the stationary blade shape is formed by the coil end, and the passage of the cooling medium is formed between the plurality of stationary blade shapes, so that the flow of the cooling medium is made more efficient and the heat radiation at the coil end is reduced. Promoted. For example, when general air is used as the cooling medium, the cooling air generated by the cooling fan smoothly passes through the coil end group, so that the interference sound generated from the coil end group can be greatly reduced, and OA And pitch noise can both be reduced. In addition, the heat radiation area of the armature coil can be improved, and the cooling performance can be improved.

Incidentally, the stationary blade shape can be formed by arranging a plurality of coil ends. According to such a configuration, it is possible to obtain a stationary blade shape without being restricted by the shape of the electric conductor forming the coil end, and as a result of arranging a plurality of coil ends, the physical size of the coil end group does not increase. .

Further, the stationary blade shape can be formed by making the sectional shape of the coil end into a rectangular shape. According to such a configuration, the stator blade shape can be easily obtained, and
The surface area can be increased also as the coil end of the book. It is desirable that the stationary blade shape is formed to have a thickness corresponding to the thickness of the coil end, and to be formed so as to extend along the flow direction of the cooling medium with a width equal to or greater than the thickness of the coil end. According to this configuration, the surface of the coil end to be cooled can be sufficiently brought into contact with the cooling medium, and the flow resistance to the flow of the cooling medium can be reduced, and the disturbance of the flow of the cooling medium can be reduced. For this reason, when air is used as the cooling medium, the heat dissipation can be improved and the noise can be reduced.

[0013] Here, the minimum unit of an independent electrical conductor that is electrically insulated as the coil end can be made to correspond. In this case, the thickness refers to the diameter in the case of a conductor having a circular cross section, the dimension of its short side in the case of a conductor having a rectangular cross section, and the dimension in the short axis side of the conductor having an elliptical cross section. Further, the coil end has a circumferentially extending portion extending along the circumferential direction of the stator core, and a radially extending portion extending along the radial direction of the stator core. A configuration in which a stationary blade shape is formed can be employed.

In this configuration, since the coil end has a characteristic configuration of a radially extending portion, a stator blade shape is formed by the radially extending portion, and in particular, a passage along the radial direction can be provided. . Note that the radially extending portion may have a shape that extends in the axial direction at the same time. Further, the circumferentially extending portion may be arranged on only one side of the radially extending portion, in addition to a mode of being arranged as an inner layer portion and an outer layer portion on both sides of the radially extending portion.

Further, it is desirable that the coil end group has a stationary blade shape and a passage with a substantially uniform density over the entire circumference. Further, it is desirable that the coil end group is configured by arranging a stationary blade shape having a substantially uniform shape over the entire circumference. According to such a configuration, uniform flow characteristics for the cooling medium over the entire circumference of the coil end group can be obtained. When a cooling fan is employed, excellent low noise characteristics, high heat radiation, and high cooling performance can be obtained over the entire circumference with respect to the ventilation.

The rotor may be provided with a moving blade for flowing a cooling medium toward the coil end group. Thereby, the rotor blades are arranged close to the coil end group, and efficient circulation of the cooling medium can be realized. In particular, when a cooling fan is used as the moving blade, excellent low noise characteristics, high heat radiation, and cooling performance can be obtained.

Furthermore, it is possible to adopt a configuration in which a coil end group is formed at each of both ends of the stator, and a rotor is formed with a rotor blade corresponding to each coil end group. As a result, the same effects as described above can be obtained in the coil end groups at both ends. The armature coil has a U-shaped segment having two straight portions housed in different slots of the stator core and a U-shaped turn portion forming a coil end at an end of the stator core. It can be provided and configured. According to this configuration, the space factor of the electric conductor in the slot can be improved. In addition, the management of the gap between the coil ends in the coil end group is facilitated, so that the stationary blade shape can be easily configured.

The armature coil has a first three-phase connection coil and a second three-phase connection coil mounted on a common stator core, and each three-phase connection coil is a short-node lap winding coil. It is possible to adopt a configuration in which each phase is connected in the same connection manner, and each phase of each three-phase connection coil is mounted on the stator core shifted by π / 3 (radian). According to such a configuration, the overlap of the coil ends can be reduced and the surface area of the stationary blade can be increased, so that the cooling performance can be improved, and the fan noise can be reduced when a blower fan is employed.

The stator may have a configuration in which the number of slots per pole and phase is two. According to this configuration, the coil end can be arranged with a uniform gap, and the number of layers of the armature coil can be doubled, and the surface area of the stationary blade can be increased, so that the cooling performance can be improved, and when a blower fan is employed. Can reduce fan noise.

By forming at least a part of the coil end portion by a plate-like member to form a stationary blade, the stationary blade cooperates with the rotor blade of the rotor, so that the armature coil can be efficiently cooled. it can. In addition, since the stationary blade portion is formed in a plate shape, the cooling air flows smoothly along the surface of the plate portion, so that interference noise generated by the coil end group can be reduced.

By making the coil end portion a plate-like conductor that extends along the direction of air flow of the rotor blade, the coil end portion can be effectively cooled without obstructing the flow of cooling air, and the coil end portion can be cooled by the coil end portion. It is possible to significantly reduce the generated interference sound. By arranging the extending portions extending from the transition portion of the coil end portion, the stationary blade can be easily formed. Thus, cooling of the coil end portion and reduction of fan noise can be achieved by using the stationary blade portion.

By using the connecting portion of the segment as the extending portion as the stationary blade, the end of the segment can be used without waste as a cooling member and a fan noise reducing member, and the formation of the stationary blade is facilitated. At the same time, the direction can be easily adjusted. Since the inner layer portion of the coil end portion near the rotor blade of the rotor constitutes the stationary blade, the cooling capability of the coil end and the effect of reducing the interference noise of the cooling wind can be enhanced.

Since the inner layer portion of the coil end portion regularly extends so as to form a predetermined angle with the rotating direction of the rotor blade,
The gap between the adjacent inner layers can be widened to reduce the ventilation resistance of the cooling air, and the cooling performance can be improved by increasing the air volume. In addition, since the cooling air generated along the rotating direction of the rotor blade flows along the inner layer, the heat radiation of the coil end portion can be improved.

By forming an outer layer portion on the outer peripheral side of the inner layer portion of the coil end portion so as to intersect the inner layer portion, a regular mesh-shaped coil end portion can be formed. By applying the cooling air generated thereby, the coil end portion can be cooled, and fan noise can be reduced by covering the outer periphery of the moving blade with the mesh portion.

[0025] In addition to the bridging portions corresponding to the inner layer portion and the outer layer portion of the coil end portion, by having an extending portion extending from this bridging portion, the cooling effect by the extending portion and the effect of reducing fan noise are greatly added. This makes it possible to reduce the temperature of the coil end and reduce noise. By forming an armature coil by connecting a plurality of segments and using a connection portion of each segment as an extended portion as a stationary blade, formation of the stationary blade and adjustment of its direction are facilitated.

By forming the entire coil end portion with a plate-shaped conductor, the plate-shaped portion serves as a fin member, and the moving blade cooperates with the fin member. Can be cooled.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a partially broken cross section of the vehicle alternator according to the present embodiment. The vehicle alternator 1 has a frame 10. Frame 10
Is composed of a front frame 11 and a rear frame 12, which are fastened by a plurality of fastening bolts 13.
In the frame 10, inlet openings 14 and 15 are formed at both ends in the axial direction as cooling air inlets. On the other hand, a plurality of exit openings 16 and 17 as slit-shaped cooling air outlets are opened in parallel in the circumferential direction on the radially outer peripheral surface of the frame 10 corresponding to the radially outer side of a cooling fan described later.

A rotary shaft 20 is rotatably supported by the frame 10. A pulley 21 receiving the power of the engine is fixed to a front portion of the rotating shaft 20.
A rotor 30 is fixed to the center of the rotation shaft 20. Further, a current collector 42 including a slip ring and a brush is attached to the rear end of the rotating shaft 20, and a field current to the field coil 32 is supplied.

The rotor 30 includes a rundle type pole core 3.
1 and a field coil 32 attached to the pole core 31
And The pole core 31 includes a pair of claw poles 3.
1a and 31b. Each of the claw poles 31a and 31b has a boss 31c fitted and fixed to the rotating shaft 20,
Disk portion 31d extending radially outward from the boss portion
And a claw-shaped magnetic pole portion 31e extending in the axial direction from the disk portion. FIG. 4 shows the claw pole 31a.
31c, 31d, and 31e.

At both ends of the rotor 30 in the axial direction, cooling fans 33 and 34 as moving blades are fixed to the end faces. The front-side cooling fan 33 is configured by mixing a fan blade as a centrifugal fan and a fan blade as a mixed flow fan. The fan blade of the mixed flow fan is provided on the axial end surface of the disk portion 31d so as to substantially coincide with the U-shaped opening formed between the claw-shaped magnetic pole portions 31e. On the other hand, the rear cooling fan 34 is configured by a fan blade as a centrifugal fan.

A stator 40 is arranged on the outer peripheral side of the rotor 30 so as to face the same. This stator 40 is mounted on the frame 10
It is fixed to. The stator core 41 is formed in a cylindrical shape by laminating steel plates to a predetermined thickness, and has a plurality of slots formed on an inner peripheral surface. An armature coil 50 is wound around the stator 40 by a coil element wire provided with an organic insulating film. The armature coil 50 has a housing portion housed in the slot, and coil end groups 54 and 55 exposed at both axial ends of the stator 40.

FIG. 1 is a plan view of the stator 40 viewed from the outside in the radial direction. FIG. 1 shows three repeating units of the coil end. FIG. 2 is a plan view of the stator 40 viewed from the axial direction. FIG. 2 illustrates three repeating units of the coil end. FIG.
FIG. The armature coil 50 includes an X-phase coil group 51 and a Y-phase coil group 5 as a three-phase AC generator.
2, including a Z-phase coil group 53. Coil end group 54, 5
5 is a plurality of coil ends 5 as crossovers between slots.
Reference numeral 6 denotes an aggregate. In each phase, two coils are bundled and wound, and as a result, four coils are inserted in one slot.

A voltage adjusting circuit 60 and a rectifying circuit 70 are mounted on the outside of the rear frame 12, and a plate-shaped cover 8 is provided.
Covered with 0. Next, the basic operation of the vehicle alternator 1 of FIG. 4 will be described. When the rotor 30 is rotationally driven by the engine, the voltage adjustment circuit 60 sends the current collector 42
A field current is supplied to the field coil 32 via the. As a result, a rotating field is formed, and AC power is generated in the armature coil 50 mounted on the stator 40. This AC power is rectified by the rectifier circuit 70 and output as DC power.

The rotation of the rotor 30 causes the cooling fan 3
3, 34 rotate and draw air from both ends in the axial direction,
Discharges radially outward. On the front side, the entrance opening 14
Cooling air is introduced from. The cooling air is divided into a flow toward the coil end group 54 and a flow for cooling the rotor 30 by flowing in the axial direction along the claw-shaped magnetic pole portions 31e. At this time, a part of the air is caused to flow outward in the centrifugal direction by the side wall surface of the U-shaped opening of the disk portion 31d of the front claw pole 31a, and heads toward the coil end group 54.

On the rear side, the air after cooling the voltage adjusting circuit 60, the rectifying circuit 70, and the current collector 42 is introduced from the inlet opening 15 through a plurality of openings formed in the cover 80. This cooling air flows toward the coil end group 55. At the same time, the cooling air that has passed between the claw-shaped magnetic pole portions 31e is applied to the disk portion 31 of the rear claw pole 31b.
The flow is made to flow outward in the centrifugal direction by the side wall surface of the U-shaped opening d and heads toward the coil end group 55.

The cooling air generated by the two cooling fans 33 and 34 serving as cooling means cools all the components of the vehicle alternator 1 and particularly toward the outlet openings 16 and 17. In the flowing process, the coil end group 54,
The coil end 56 constituting 55 is cooled. Next, the configuration of the coil end groups 54 and 55 and the principle of fan noise reduction will be further described.

As shown in FIG. 4, the coil end groups 54, 55 are provided on the path of the cooling air from the cooling fans 33, 34 provided on both end faces of the rotor 30 to the outlet openings 16, 17. Are located. Coil end group 54, 5
5 is arranged near the outer peripheral side of the cooling fans 33 and 34, that is, immediately after the blowing side. In particular, the axial ends of the coil end groups 54 and 55 are
3, 34 are located approximately at the center of the axial height.

As shown in FIGS. 1 to 3, the coil end groups 54 and 55 are configured as an aggregate of a plurality of coil ends 56. As shown in FIG. 3, the coil end 56 has a belt-like body 57 formed by arranging two coil ends 56a and 56b in parallel. For this reason, the band-like body 57 has a thickness corresponding to the diameter of the coil ends 56a and 56b, and has a width equal to or greater than the diameter of the coil ends 56a and 56b. Each coil end 56a, 56
b is a unit electric conductor of a circular cross section insulated from each other. Such a configuration can be obtained by bundling a plurality of electric conductors in advance and wrapping them around the stator core 41.

As shown in FIG. 2, two strips 57 are arranged in one slot, and as a result, four electric conductors are arranged in one slot. One belt-like body 57 has two skewing portions 57a and 57b extending along the circumferential direction of the stator core 41, and a turning portion 57c which is raised in the axial direction and bent in the radial direction. One skewing portion 57a is arranged radially outward, and the other skewing portion 57b is arranged radially inside. A turn portion 57c extending in the radial direction is provided between these two oblique portions.
Is arranged.

In this embodiment, one strip 57 is arranged so as to bridge between different slots. In addition, on the end face of the stator core 41, the stator core 41 is laid with a laying pattern extending from the inner diameter side of one slot and entering the outer diameter side of the other slot. The plurality of strips 57 arranged on one end face of the stator core 41 all have the same shape and are all arranged with the same laying pattern.

The strips 57 are all dispersedly spaced apart from each other with a gap therebetween, forming an air passage therebetween. In addition, the belt-shaped body 57 has an outer layer sloping portion 57a, an inner layer sloping portion 57b, and a turn portion 57c.
Are arranged in such a manner that the width direction thereof coincides with the radial direction of the stator 40. For this reason, the stator 4
A small projection area is provided in the radial direction of 0, and a wide area is provided along the radial direction.

In this configuration, the plurality of strips 57 are arranged in parallel with the radial direction, and form stationary vanes for the cooling fans 33 and 34. For this reason, the cooling air pressure generated by the cooling fans 33 and 34 is efficiently discharged to the outlet openings 16 and 17 provided on the outer periphery of the frame. As a result, the cooling air generated by the rotation of the rotor 30 passes along the belt-like body 57 including the coil end 56 by using the cooling fans 33 and 34 and the claw-shaped magnetic poles of the rotor 30 as the blowing means. For this reason, the surface of the coil end 56 can be uniformly cooled over a wide range. Moreover, the cooling air and the coil end 5
6 can be greatly reduced.

Further, the coil end groups 54 and 55, which are also an aggregate of the plurality of strips 57, are formed by repeating the strips 57 having the same shape over the entire circumference, so that the low ventilation resistance is uniform over the entire circumference. To provide a uniform guide angle for cooling air over the entire circumference. For this reason,
The reflected wave due to the collision of the cooling air can be reduced. In particular, the turn portion 57c provides a band-shaped portion that extends in the radial direction at the axial end portions of the coil end groups 54 and 55.
For this reason, the present invention provides a stationary blade that increases the efficiency of blowing the cooling air from the cooling fans 33 and 34 and reduces noise.

It is preferable that the coil end group has a configuration in which all of the coil ends included therein have completely the same shape, and are arranged uniformly without deviation. Are partially irregularly shaped, and their arrangement is also partially irregularly shaped. Such irregularities occur due to the output of the multi-phase armature coil, interphase connection, or errors in the manufacturing process. However, such a degree of partial irregularity does not make a significant difference in performance. For this reason, such irregularities are within acceptable limits,
Even if such a degree of irregularity is included, the coil end group is configured by arranging coil ends of the same shape over the entire circumference, and the coil end group provides uniform density and ventilation resistance over the entire circumference. It can be said.

As the cooling fans 33 and 34, a cooling fan having a flat fan blade or a curved fan blade can be used. Also,
As the cooling fans 33 and 34, a cooling fan in which a plurality of fan blades are arranged at an equal pitch or an unequal pitch can be adopted. Furthermore, a configuration in which a cooling fan is provided only on one end face of the rotor 30 may be adopted, and only the coil end group facing the cooling fan may be configured with the coil ends forming the stationary blade shape as described above. . Also in such a configuration, the ventilation in the coil end group can be made more efficient, and effects such as lower noise and improved heat dissipation can be obtained. That is, it is important that at least one of the coil end groups formed on both end faces of the stator core has the shape according to the present invention.

[Other Embodiments] In the above-described embodiment, the coil ends 54 and 55 have the same shape, but as shown in FIG. 5, the coil end groups at both ends are different from each other. It is also possible to provide vane shapes having different characteristics. By employing such a configuration, it is possible to provide a stator blade shape corresponding to the air blowing characteristics before and after the stator core. Further, only the turn portion 57c may have a shape of a stationary blade. According to this configuration, it is possible to improve the heat radiation property and reduce noise at the axial end of the coil end group while reducing the axial height of the coil end group.

Further, the coil end 5 shown in FIG.
The stator vane shape may be provided on only one of 4, 4 and 55. In this case, the remaining coil end group can have a shape in which a plurality of coil ends are arranged without gaps. According to such a configuration, it is possible to reduce the size in accordance with the required specifications by taking advantage of the effects of improving heat dissipation and reducing noise. Next, another embodiment will be described.

In this embodiment, substantially U having a rectangular cross section is used.
An armature coil is formed using a character-shaped segment.
The plurality of substantially U-shaped segments are mounted on the stator core 41, and one end face of the stator core 41 forms a coil end at a U-shaped turn portion, and the other end face of the stator core 41 has a U shape. The two ends of the letter are connected to other segments to form a coil end. By forming the armature coil using the segment formed of the plate-shaped conductor, the shape of the stationary blade cooperating with the cooling fan of the rotor as the moving blade can be easily realized by the coil end portion.

For example, as shown in FIG. 6 and FIG. 7, two straight portions 91 as storage portions, and these straight portions 9
As shown in FIGS. 8 to 11, one straight portion 91 is connected to the inner diameter side of the slot of the stator core, and Is inserted into the stator slot such that the straight portion 91 is on the outer diameter side of the slot. One of the two straight portions 91 is inserted into the inner diameter side of the slot and the other is inserted into the outer diameter side. The outer half portion 95b of the other half is disposed at a position close to the fan and at a position far from the cooling fan of the rotor.

In this manner, a group of coil ends as shown in FIG. 11 is formed on one end face of the stator 40. This coil end group is formed by arranging a plurality of coil ends having the same shape. Each of the coil ends is constituted by a transition portion 95 of the U-shaped segment 90. Accordingly, one coil end includes an inner layer portion 95a as a circumferentially extending portion that extends obliquely in the axial direction along the circumferential direction of the stator 40, and an outer layer portion 95.
In order to connect the inner layer portion 95a and the outer layer portion 95b, a folded portion 92 as a radially extending portion extending along the radial direction of the stator 40 is provided.

On the other hand, on the other end face of the stator 40, FIG.
A coil end group as shown in FIG. The ends of the two straight portions 91 of the segment 90 are respectively arranged so as to protrude from the slots. As shown in FIG. 8 or FIG. 10, these ends are bent so that the inner layer portion and the outer layer portion are inclined in opposite directions along the circumferential direction of the stator. Each end is then connected to an end of a different layer of another segment projecting from a different slot separated by a predetermined pitch.

For example, the inner layer portion 93a is connected to the outer layer portion 93b of another segment. In order to connect the inner layer portion 93a and the outer layer portion 93b, an extended portion 93c is formed to extend further in the axial direction than the transition portion formed by the inner layer portion 93a and the outer layer portion 93b. The joining at the extending portion 93c can employ a technique such as ultrasonic welding, arc welding, brazing or caulking so that electrical connection can be achieved and required mechanical strength can be obtained.

Therefore, one coil end is connected to the stator 40
Has an inner layer portion 93a as a circumferentially extending portion extending obliquely in the axial direction along the circumferential direction, and an outer layer portion 93b. Further, the inner layer portion 93a and the outer layer portion 93b are fixed to connect the inner layer portion 93a and the outer layer portion 93b. It has an extension 93c as a radially extending portion extending along the radial direction of the child 40. In addition,
In the embodiment illustrated in FIGS. 8-11, the stator 40
Two electric conductors are accommodated in one slot.

In this embodiment, the electric conductor constituting the armature coil has a rectangular cross-sectional shape, and a stationary blade shape is obtained in the entire coil end portion. Therefore, it is possible to improve heat dissipation and reduce noise. By employing such a configuration, the surface area that receives the cooling air from the cooling fan can be increased, and the heat dissipation can be promoted to improve the cooling performance. Further, wind noise at the coil end can be reduced to reduce noise.

In this embodiment, of each coil end, the folded portion 92 or the extended portion 93c as an axial end remote from the stator core has a high inclination angle which is effective as a stationary blade. Area. At the axial end of the coil end, in other words, at the distal end, the electric conductors are arranged at an inclination angle along the direction of air blowing from the cooling fan. At the axial end of the coil end, the cooling effect due to the heat transfer to the stator core is low, but high cooling performance can be exhibited by supplementing this. Also, since relatively strong wind from the cooling fan of the rotor is received by the axial end of the coil end, noise reduction can be achieved by forming such a portion into a stationary blade shape.

In this embodiment, of the coil end portions, inner layer portions 95a and 93a as inner layer portions located radially inward of the stator core have shapes as stationary vanes. For this reason, the stationary blade is arranged near a cooling fan as a moving blade mounted on the rotor. In this embodiment, one coil end having an inner layer portion and an outer layer portion has the inner layer portion disposed forward and the outer layer portion disposed rearward with respect to the rotation direction of the cooling fan 33 or 34 serving as a moving blade. . For this reason, one coil end can provide a stationary blade shape that is reasonably inclined along the rotation direction of the cooling fan.

In particular, in the folded portion 92 formed by bending a rectangular conductor, a shape is obtained that is smoothly and continuously connected from the inner layer portion to the outer layer portion. Similarly, in the extended portion 93c formed by joining the flat conductors,
A shape that is smoothly and continuously connected from the inner layer portion to the outer layer portion is obtained. For this reason, it is possible to provide a stationary blade shape that is inclined along the rotation direction of the cooling fan.

In this embodiment, a rectangular copper wire having a width larger than the thickness in the cross section is used as the electric conductor, and the stationary blade is provided by the plane of the rectangular copper wire. Thereby, a stationary blade can be provided with a simple configuration. Moreover, the entirety of one coil end bridged between one slot and another slot provides a vane. Further, since the armature coil is composed of a plurality of segments, the formation of the stator blade-shaped coil end portion is facilitated.

In this embodiment, a plurality of coil ends are annularly arranged and arranged on one end face of the stator core to form a group of coil ends, that is, a group of coil ends. A gap is secured between almost all coil ends, and almost all of the multiple coil ends are placed as vanes in the flow of air blown by the cooling fan,
The entire outer surface of the coil end is in contact with the blast air.
In addition, almost all of the plurality of coil ends disposed on one end face of the stator core have the same shape.

For this reason, in the coil end group,
The coil ends are arranged at a uniform density over the entire circumference. Moreover, since the coil ends are arranged along the radial direction in the longitudinal direction of the cross section, the coil ends exhibit lower ventilation resistance in the radial direction than in the circumferential direction. Furthermore, as a result of the coil ends having the same shape being arranged, the coil end group
A stationary blade having uniform ventilation resistance and an inclination angle over the entire circumference is provided. For this reason, by combining with a vehicle AC generator having a cooling fan at the end of the rotor, a higher cooling effect can be obtained by the cooling fan. In addition, noise can be reduced.

The coil end group surrounds the cooling fans 33 and 34 in a fine mesh shape as a whole. For this reason, the effect of reducing the wind interference sound is exhibited as in the case of the mesh-shaped wind screen put on the microphone or the like. Further, similar coil end groups are formed on both end faces of the stator core, and the effect of the stationary vane can be obtained at both ends of the stator core. For this reason, by combining with a vehicle AC generator having cooling fans at both ends of the rotor, a high cooling effect can be obtained by both cooling fans. In particular, both coil end groups can be cooled evenly. In addition, it is possible to reduce the blowing noise caused by both cooling fans.

In the embodiment of FIGS. 8 to 11, the case where two electric conductors are arranged in one slot of the stator 40 has been described, but four electric conductors are arranged in one slot. Alternatively, the same effect as in the above embodiment can be obtained. As shown in FIGS. 12 and 13, it is also easy to change the inclination angle of the stationary blade portion of each segment, and the stationary blade portion of the stator is changed in accordance with the direction of the cooling air discharged from the cooling fan of the rotor. The angle can be changed as appropriate.

Next, a description will be given of a winding method and a wiring method of the multi-phase winding which can be adopted in the above-described embodiment. In the embodiment described above, the armature coil 5
Various winding methods can be adopted as the zero winding method. For example, wave winding, lap winding, concentrated winding, or distributed winding can be adopted, and the winding pitch is not limited to full-pitch winding and can be adopted.

A typical example of the winding method will be described with reference to FIGS. FIG. 14 shows two stators mounted on the same stator core.
The armature coils of the group are shown separately in upper and lower parts for ease of explanation. The armature coil 50 has a first polyphase coil group 510 and a second polyphase coil group 520. The first multi-phase coil group 510 has a plurality of coils 511, 512, and 513 mounted on the stator core by short-section lap winding corresponding to the magnetic pole pitch of the rotor. Construct a phase connection coil. On the other hand, the second polyphase coil group 520 has a plurality of coils 521, 522, and 523 mounted on the stator core by short-section lap winding corresponding to the magnetic pole pitch of the rotor. To form a multi-phase connection coil. Further, one coil of the first multi-phase coil group 510 and one coil of the second multi-phase coil group 520 for generating a corresponding phase output are shifted by π / 3 (radian). ing. FIG. 14 illustrates a case of three phases.

FIG. 15 shows an example of the winding specification when the number of stator slots per pole and phase is two. FIGS. 15A and 15B respectively show VII-VI
A series of armature coils 50 connected by I lines and VIII-VIII lines and arranged in an annular shape is shown. In this embodiment, twelve teeth between the slots of the stator core are formed with respect to the two magnetic pole pitches of the rotor. The armature coil 50 has a first polyphase coil group 530 and a second polyphase coil group 540. First polyphase coil group 5
Reference numeral 30 denotes a plurality of coils 531, 532, 53 mounted on the stator core by wave winding corresponding to the magnetic pole pitch of the rotor.
3 These are connected in polyphase. On the other hand, the second polyphase coil group 540 includes a plurality of coils 541 mounted on the stator core by wave winding corresponding to the magnetic pole pitch of the rotor.
542 and 543. These are connected in polyphase. Further, one coil of the first multi-phase coil group 530,
Second polyphase coil group 5 for generating a corresponding phase output
The one coil 40 is shifted by π / 6 (radian). FIG. 15 illustrates a case of three phases.

As an electric conductor that can be used in the above-described embodiment, a wire obtained by providing an organic insulating film on a copper wire can be used. In addition, using bare copper wire without film,
It is good also as a structure which obtains required insulation with an organic insulating film. In addition, as the cross-sectional shape of the electric conductor, a circular cross section,
A rectangular section, polygonal section, or polyhedral section can be used.

As shown in FIGS. 16 and 17,
The coil end shape of the armature coil wound with a continuous wire
It is also possible to form a wall-shaped stationary blade portion aligned with the direction of the rotation axis, separate the stationary blade portions, and allow cooling air to pass between them.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the shape of a coil end group according to the present invention.

FIG. 2 is an axial plan view showing the shape of a coil end group according to the present invention.

FIG. 3 is a perspective view showing a shape of a coil end group of the present invention.

FIG. 4 is a partially cutaway sectional view of a vehicle generator to which the present invention is applied.

FIG. 5 is a schematic view illustrating the shape of a coil end group according to another embodiment.

FIG. 6 is a plan view of a substantially U-shaped segment.

FIG. 7 is a schematic view of a substantially U-shaped segment.

FIG. 8 is a schematic diagram showing the shape of a coil end group according to another embodiment.

FIG. 9 is an axial plan view illustrating a shape of a coil end group according to another embodiment.

FIG. 10 is a perspective view showing the shape of a coil end group according to another embodiment.

FIG. 11 is a perspective view showing the shape of a coil end group according to another embodiment.

FIG. 12 is a schematic view illustrating a modified example of the coil end group shape according to another embodiment.

FIG. 13 is an axial plan view showing a modification of the coil end group shape according to another embodiment.

FIG. 14 is an explanatory view showing a winding structure according to the invention of claim 6;

FIG. 15 is an explanatory view showing a winding structure according to the invention of claim 7;

FIG. 16 is an axial plan view showing the shape of a coil end group according to another embodiment.

FIG. 17 is a schematic view showing the shape of a coil end group according to another embodiment.

FIG. 18 is a schematic view showing the shape of a conventional coil end group.

FIG. 19 is a plan view showing the shape of a conventional coil end group.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle alternator 10 Frame 30 Rotor 40 Stator 50 Armature coil 54, 55 Coil end group 56 Coil end

Claims (22)

[Claims] 1. A stator core fixed to a frame and having a plurality of slots, and a polyphase armature coil housed in the slots, wherein the polyphase armature coil is provided at an axial end of the stator core. A stator in which an annular coil end group as an aggregate of a plurality of arm ends of the armature coil is formed, and a rotor arranged to face the stator, wherein the coil in the coil end group An alternator for a vehicle, wherein a stationary blade shape is formed by an end, and a passage of a cooling medium is formed between the plurality of stationary blade shapes formed in the coil end group. 2. The alternator for a vehicle according to claim 1, wherein the stator blade shape is formed by arranging a plurality of the coil ends. 3. The alternator for a vehicle according to claim 1, wherein the stator blade shape is formed by making a cross-sectional shape of the coil end into a rectangular shape. 4. The cooling medium according to claim 1, wherein the stationary blade shape is formed with a thickness corresponding to the thickness of the coil end, and the width of the cooling medium is greater than the thickness of the coil end. An alternator for a vehicle, wherein the alternator is formed so as to extend along a flow direction. 5. The stator according to claim 1, wherein the coil end has a circumferentially extending portion extending along a circumferential direction of the stator core, and a diameter extending along a radial direction of the stator core. An AC generator for a vehicle, comprising: a radially extending portion; and the stationary blade shape is formed by at least the radially extending portion. 6. The vehicle according to claim 1, wherein the coil end group has the vane shape and the passage with a substantially uniform density over the entire circumference. For alternator. 7. The coil end group according to claim 1, wherein the coil end group is configured by arranging the stationary blade shapes having a substantially uniform shape over the entire circumference. AC generator for vehicles. 8. The automotive alternator according to claim 1, wherein the rotor is provided with a moving blade for flowing a cooling medium toward the coil end group. 9. The method according to claim 8, wherein the coil end group is formed at each of both ends of the stator, and a rotor blade corresponding to each of the coil end groups is formed on the rotor. Characteristic alternator for vehicles. 10. The coil end according to claim 1, wherein the armature coil has two straight portions housed in different slots of the stator core and an end portion of the stator core. An alternator for a vehicle, comprising: a U-shaped segment having a U-shaped turn portion forming the following. 11. The armature coil according to claim 1, comprising a first three-phase connection coil and a second three-phase connection coil mounted on a common stator core. The three-phase connection coil is configured by connecting the short-coil wrapped coils in each phase in the same connection manner, and each phase of each three-phase connection coil is shifted by π / 3 (radian) and mounted on the stator core. AC generator for vehicles. 12. The vehicle alternator according to claim 1, wherein the stator has two slots for each phase of each pole. 13. A stator comprising a stator core having a plurality of slots formed therein, a multi-phase armature coil mounted on the stator core, and a rotor for providing a rotating magnetic field interlinking the stator. In the automotive alternator comprising: the multi-phase armature coil includes: a plurality of housing portions housed in the slot; and a space between the housing portions in the slot separated by a predetermined pitch at an end of the iron core. A plurality of coil end portions, and the rotor has a moving blade for blowing air toward the plurality of coil end portions, and each of the coil end portions is disposed apart from each other, and Between the coil end portion located in the air passage, at least a part of the coil end portion is configured by a plate-shaped conductor, to constitute a stationary blade that cooperates with the rotor blade. Feature Vehicle alternator. 14. The alternating current power generator for a vehicle according to claim 13, wherein the coil end portion located in the ventilation passage is formed of a plate-shaped conductor that extends in a ventilation direction of the moving blade. Machine. 15. The device according to claim 14, wherein the coil end portion has a crossover portion connecting the storage portions in the slot separated by a predetermined pitch, and an extension portion extending from the crossover portion. An AC generator for a vehicle, wherein an extended portion constitutes the stationary blade. 16. The alternator for a vehicle according to claim 15, wherein the armature coil is configured by connecting a plurality of segments, and the extending portion is a connecting portion of the segments. 17. The vehicle AC according to claim 14, wherein the coil end portion has an inner layer portion disposed close to the rotor blade, and the inner layer portion constitutes the stationary blade. Generator. 18. The alternator according to claim 17, wherein the inner layer portion extends at a predetermined angle with respect to a rotation direction of the rotor blade. 19. The coil end portion according to claim 18, wherein the coil end portion further has an outer layer portion disposed apart from the rotor blade, and the outer layer portion extends crossing the inner layer portion. Vehicle alternator. 20. The coil end part according to claim 19, wherein the coil end portion has a bridging portion composed of the inner layer portion and the outer layer portion, and an extending portion extending from the bridging portion. Comprises the stationary vane. 21. The alternator according to claim 20, wherein the armature coil is configured by connecting a plurality of segments, and the extending portion is a connecting portion of the segments. 22. The alternator for a vehicle according to claim 14, wherein the coil end portion is entirely formed of a plate-shaped conductor and forms a stationary blade that cooperates with the rotor blade.