JP3438606B2 - AC generator for vehicles - Google Patents

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 or the like.

[0002]

2. Description of the Related Art In recent years, the engine room has become more and more narrow due to the slant nose to reduce the running resistance of the vehicle and the securing of living space inside the vehicle. Is disappearing. On the other hand, as the engine becomes quieter, noise reduction of the vehicle alternator is required. That is, it is required to provide a small-sized, high-power, low-noise vehicle AC generator at low cost.

As a means for reducing the size and increasing the output of an automotive alternator, there is an improvement in the cooling performance of the stator winding, which has the largest heat loss. Conventionally, a cooling fan is arranged in a frame as shown in FIG. However, an internal fan structure is generally used in which cooling air is directly applied to the coil ends for cooling. Here, FIG.
In the structure of 3, the cooling fan faces only the tip of the coil end group of the stator winding, and the cooling air generated by the rotation of the cooling fan is blown only to the tip of the coil end group and is discharged. Therefore, there is a problem that the cooling effect of the stator winding is low. On the other hand, actual Kaihei 5-1176
8 proposes that the coil end group of the stator winding is extended in the axial direction so as to sufficiently face the cooling fan, but since the root of the coil end group does not face the cooling fan, this part There is a problem that the cooling effect is low, and the output decreases due to the increase in the resistance value of the stator winding due to the height increase of the coil end.

Generally, it is well known that increasing the contact area of the cooling air and increasing the amount and speed of the cooling air are effective in improving the cooling performance. On the other hand, in a vehicle AC generator having an inner fan structure, unevenness is formed on the inner peripheral surface of the coil end group by disposing polyphase windings while overlapping them in the circumferential direction. Therefore, the periodic pressure fluctuation caused by the collision of the cooling wind and the unevenness increases, which causes a new problem of increasing fan noise. Japanese Unexamined Patent Application Publication No. 8-308190 discloses a structure in which the axial height of the coil end group and the height of the cooling fan are substantially equal to each other, and the two are arranged facing each other.
The problem that the fan noise increases due to the collision of the cooling air and the unevenness on the inner circumference of the coil end group still remains.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a small-sized, high-power, low-noise AC generator for a vehicle that achieves both improved cooling of the stator windings and reduced fan noise. It is a thing.

[0006]

According to the invention of claim 1, a stator core having a plurality of slots and a stator wound around the slots to form coil end groups at both axial ends of the stator core. A rotor provided with a stator provided with windings, a field iron core having magnetic pole claws arranged to face the inner peripheral side of the stator, and a cooling fan arranged at at least one axial end of the field iron core. In the vehicle alternator having, the coil end group arranged radially outside of the cooling fan is arranged such that 70% or more of its axial height overlaps with the cooling fan in the radial direction. , wherein the interior of the coil end groups are air passage formed cooling air by the cooling fan passes, and said coil
The end has a skewed portion that extends obliquely with respect to the axial direction.
Between the plurality of skewed portions included in the coil end group
It is characterized in that the ventilation passage is formed .
As a result, the wind generated by the rotation of the cooling fan passes through the inside of the coil end group over a wide range, so that the cooling efficiency can be improved, and between the inner peripheral surface of the coil end group and the outer periphery of the cooling fan. The resulting pressure fluctuation is suppressed. Therefore, it is possible to improve the cooling performance of the stator winding and reduce the fan noise. The coil end extends obliquely with respect to the axial direction.
It has a skewed part and is included in the coil end group.
It is said that the ventilation passage is formed between a plurality of oblique portions
The configuration is adopted. According to this configuration, the cooling fan
The wind from here can be softly dissipated at the slant part,
Most of the axial dimensions of the ruend group are radial of the cooling fan
Low noise even in a configuration that is directly opposed to the outside.
Sound can be realized.

According to a second aspect of the present invention, in the first aspect, the coil end group is formed by repeatedly arranging coil ends having a constant shape. As a result, irregularities on the inner peripheral surface of the coil end group are reduced, and periodic pressure fluctuations that occur between the irregularities on the inner peripheral surface of the coil end group and the outer periphery of the cooling fan are suppressed.

According to the invention of claim 3, the outer diameter of the cooling fan is 90% of the outermost diameter of the field iron core of the rotor.
As described above, it is characterized by being 96% or less. Thus, the distance between the inner periphery of the outer diameter of the coil end group of the cooling fan is widened, the pressure fluctuation of the cooling air in this portion is further reduced, Ru can further reduce the fan noise. In the invention of claim 7, since the number of blades of the cooling fan is set to a number different from the number of claws of the field iron core, the pressure fluctuation due to the centrifugal fan effect on the claw side surface of the field iron core and the pressure fluctuation due to the cooling fan are caused. It is possible to prevent the generation of loud fan noise due to synchronization.

According to the invention of claim 8 , the cooling fan having a number of blades different from the number of claws of the field iron core is provided at one end of the field iron core in the axial direction. It is desirable to secure a sufficient amount of cooling air by adopting a configuration in which another cooling fan is provided at the other axial end of the field iron core. In such a configuration, two cooling fans are installed on both end surfaces of the field core, but at least one of the cooling fans has a number of blades different from the number of claws of the field core to reduce noise. You can The number of blades of the other cooling fan can be arbitrarily selected. For example, the number of blades different from the number of claws of the field iron core may be used to prevent noise. Further, it is possible to adopt a configuration in which the number of blades is the same as the number of claws of the field core and the blades are located on the back surface of the claws to promote air blowing between the claws of the field core. The axial tip of the coil end group and the axial tip of the cooling fan are arranged so as to substantially coincide with each other, and the cooling fan relatively strongly pushes out the cooling air (from the axial center to the root).
However, it is desirable from the viewpoint of downsizing of the physique and reduction of noise that it is configured to face the oblique portion arranged at the axially intermediate portion of the coil end.

Further, it is desirable that the facing of the coil end group and the cooling fan is set to about 80% or more of the axial dimension of the coil end group in order to achieve high cooling performance.
Further, it is desirable to use a configuration in which the radially outer side of the flade of the cooling fan substantially entirely faces the inner peripheral surface of the coil end group together in order to effectively use the blowing capacity of the cooling fan.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment FIGS. 1 to 9 show a first embodiment of the present invention. FIG. 1 is a diagram showing a main part of a vehicle alternator, FIGS. 2 to 5 are explanatory diagrams of a stator of the present embodiment, and FIGS.
[FIG. 7] is an explanatory diagram of effects of the present embodiment.

The vehicle alternator 1 includes a stator 2 that functions as a stator, a rotor 3 that functions as a field, a housing 4 that supports the rotor 3 and the stator 2, and AC power that is directly connected to the stator. Is composed of a rectifier 5 for converting DC into DC and a voltage regulator 11 for increasing / decreasing the amount of field current to control the amount of power generation. The rotor 3 rotates integrally with the shaft 6, and includes a set of Lundell type field iron core 7, a front side cooling fan 12, a rear side cooling fan 13, a field coil 8, slip rings 9, 10 and the like. It is composed by. The shaft 6 is connected to the pulley 20 and is rotationally driven by a traveling engine (not shown) mounted on the automobile.

A front side cooling fan 12 and a rear side cooling fan 13 are fixed to the end faces of the rotor 3 at both ends in the axial direction. The front-side cooling fan 12 is configured by mixing a fan blade of a centrifugal fan and a fan blade of a mixed flow fan. The rear cooling fan 13
It is composed of a fan blade of a centrifugal fan. The outer diameter R0 of the cooling fans 12 and 13 is set to be smaller than the outermost diameter R1 of the field core 7. In this embodiment, R0 = 88 mm and R1 = 92 mm are set. Further, the number of fan blades is set to be smaller than the number of claws of the field core 7 in which the fan blades are arranged. In this embodiment, seven fan blades are used with eight claws. A suction hole 41 is provided on the axial end surface of the housing 4. The outer circumferential shoulders of the housing 4 are provided with cooling air discharge holes 42 corresponding to the radially outer sides of the first coil end group 31a and the second coil end group 31b of the stator 2.

The stator 2 includes a stator core 32, a stator winding formed of a plurality of electric conductors arranged in a slot 35 formed in the stator core 32, and a stator core 3
An insulator 34 that electrically insulates between 2 and the electric conductor.
And is supported by the housing 4. As shown in FIG. 2, the stator core 32 is formed with a plurality of slots 35 so as to accommodate multi-phase stator windings. In this embodiment, a plurality of slots 35 are arranged at equal intervals so as to accommodate three-phase stator windings, corresponding to the number of magnetic poles of the rotor 3. Further, the first coil end group 31 a and the second coil end group 3 of the stator 2
80% of the inner peripheral surface of 1b is the cooling fans 12, 13 respectively.
Is set to face.

The stator windings provided in the slots 35 of the stator core 32 are composed of a plurality of electric conductors, and each of the plurality of slots 35 has an even number (four in this embodiment). An electrical conductor is contained. Further, as shown in FIG. 2, the four electric conductors in one slot are arranged from the inner side to the inner end layer, the inner middle layer, in the radial direction of the stator core 32.
The outer middle layer and the outer end layer are arranged in a line in this order.

The electric conductor 331 of the inner end layer in one slot
The a is paired with the electric conductor 331b of the outer end layer in another slot which is separated from the magnetic pole pitch in the clockwise direction of the stator core 32. Similarly, the electric conductor 332a of the inner-middle layer in one slot is paired with the electric conductor 332b of the outer-middle layer in the other slot that is separated by one pole pitch in the clockwise direction of the stator core 32. Then, the electric conductors forming these pairs use the continuous wire at one end portion of the stator core 32 in the axial direction to form the turn portions 331c, 3c.
Connection is made via 32c. Therefore, at one end of the stator core 32, a continuous wire connecting the electric conductor of the outer middle layer and the electric conductor of the inner middle layer is connected to a continuous wire connecting the electric conductor of the outer end layer and the electric conductor of the inner end layer. The line will be enclosed. Thus, at one end of the stator core 32, the connecting portion of the pair of electric conductors is surrounded by the connecting portion of the other pair of electric conductors accommodated in the same slot. The middle layer coil end is formed by connecting the outer middle layer electric conductor and the inner middle layer electric conductor, and the end layer coil end is formed by connecting the outer end layer electric conductor and the inner end layer electric conductor.

On the other hand, the electric conductor 332a of the inner-middle layer in one slot is 1 in the clockwise direction of the stator core 32.
Inner end layer electrical conductors 3 in other slots separated by pole pitch
It is also paired with 31a '. Similarly, the electric conductor 331b ′ of the outermost layer in one slot is paired with the electric conductor 332b of the outer middle layer in the other slot, which is separated by one pole pitch in the clockwise direction of the stator core 32. There is. And
These electric conductors are connected by joining at the other axial end of the stator core 32.

Therefore, at the other end of the stator core 32, the joint for connecting the electric conductor of the outer end layer and the electric conductor of the outer middle layer, the electric conductor of the inner end layer and the electric conductor of the inner middle layer are connected. And a joint portion that connects to each other are arranged in the radial direction. The adjacent layer coil end is formed by the connection between the electric conductor of the outer end layer and the electric conductor of the outer middle layer, and the connection of the electric conductor of the inner end layer and the electric conductor of the inner middle layer. Thus, at the other end of the stator core 32, the connecting portion of the pair of electric conductors is
They are placed side by side without overlapping.

Further, as shown in FIG. 3, the electric conductor of the inner end layer and the electric conductor of the outer end layer are provided by a large segment 331 formed by molding a series of electric conductors into a substantially U shape. It Then, the inner-middle-layer electric conductor and the outer-middle-layer electric conductor are provided by a small segment 332 formed by molding a series of electric conductors into a substantially U-shape. Basic segment 33
Is formed by a large segment 331 and a small segment 332. Each of the segments 331 and 332 is housed in a slot and extends along the axial direction 331a, 3
31b, 332a, 332b, and oblique portions 331f, 33 extending obliquely at a predetermined angle with respect to the axial direction.
It is equipped with 1g, 332f, and 332g. These skewed parts are
The coil end is formed, and the ventilation passage is mainly formed between these oblique portions.

The above construction is repeated for all the segments 33 of the slot 35. Then, in the second coil end group 31b, the outer end layer joint 331e ′ and the outer middle layer joint 332e, and the inner middle layer joint 332d and the inner end layer joint 331d ′ are welded, ultrasonically welded, They are joined by means such as arc welding and brazing and are electrically connected. Insulation is coated to insulate and hold these joints together. In addition,
In order to improve vibration resistance and environment resistance, an insulating material may be attached so as to bridge between the plurality of joints. Also,
It is desirable that the insulating material is thickly attached only to the joint portion.

In the stator 2 manufactured as described above, FIG. 4 shows a segment for one phase viewed from the inner peripheral side of the stator core 32, and FIG. 5 is a perspective view of one coil end group. In the first coil end group 31a, the middle layer coil end and the end layer coil end are the basic coil ends. In the second coil end group 31b, the adjacent layer coil end is the basic coil end. The plurality of basic coil ends are regularly and repeatedly arranged. A gap is secured between all coil ends. Moreover, the coil ends are distributed at a substantially constant density in the circumferential direction within the annular coil end group.

In both coil end groups 31a and 31b, innumerable ventilation passages are formed between the plurality of coil ends. Moreover, those ventilation paths are evenly distributed in the circumferential direction within the annular coil end group. Inner peripheral surfaces of both coil end groups 31a and 31b are stator core 32
Is formed with an inner diameter slightly larger than the inner peripheral surface. Furthermore, both coil end groups 31a and 31b have a substantially constant height over the entire circumference.

Each of the coil end groups 31a and 31b includes only a few odd-shaped coil ends as winding connections or lead wires. Due to the presence of such deformed coil ends, the gap as a ventilation path between the coil ends locally widens or narrows, but does not form a conspicuous sparse / dense distribution in the circumferential direction in the coil end group. .

Although each coil end group 31a, 31b is thinly coated with a resin film, all the gaps between the coil ends are not completely closed. The thin resin film does not form a large density in the distribution of the gaps between the coil ends. Further, the thin resin film may cross-link between the coil ends in the radial direction and adhere, but the thin resin film has a small effect on the ventilation and does not form a large density.

In this way, both coil end groups 31a, 3
1b is mainly configured by arranging coil ends of a constant shape. Moreover, the coil ends are arranged with a substantially uniform density in the circumferential direction. Therefore, there is almost no sparse or dense coil end in the circumferential direction. The axial ends of the coil end groups 31a and 31b are substantially aligned with the axial ends of the cooling fans 12 and 13. And
About 80% of the axial dimension of the inner peripheral surface of each coil end group 31a, 31b is about the cooling fan 1 arranged on the inner periphery thereof.
2 and 13 are overlapped in the radial direction. Particularly, in this embodiment, each coil end group 31a, 31
About 80% of the axial dimension of the inner peripheral surface of b directly faces the outermost diameter portion of the cooling fans 12 and 13 arranged on the inner peripheral side in the radial direction. Moreover, the sides of the outermost diameter portions of the cooling fans 12, 13 are almost entirely opposed to the inner peripheral surfaces of the coil end groups 31a, 31b. Such a facing relationship between the coil end group and the cooling fan is ensured over the entire circumference of the coil end group. Therefore, an area of about 80% of the inner peripheral surface of each coil end group 31a, 31b directly receives the cooling air sent from the rotating cooling fans 12, 13 to the outside in the centrifugal direction.

In this embodiment, the coil end group 31a
The axial dimension L2 of the outermost diameter portion of the cooling fan 13 is about 80% of the axial dimension L1 of the above. The axial dimension L4 of the outermost diameter portion of the cooling fan 12 is about 80% of the axial dimension L3 of the coil end group 31b. [Operational Effects of First Embodiment] FIG. 6 is a graph showing the cooling effect of the stator windings of the present embodiment. The temperature of the stator winding was measured by the resistance method, with the ratio of the inner peripheral surface of the coil end group of the stator winding facing the cooling fan as a parameter. 70 of the inner peripheral surface of the coil end group of the stator winding
It can be seen that if at least% faces the cooling fan, the temperature of the stator winding can be kept low and good cooling performance can be obtained.

FIG. 7 is a graph showing the fan noise reduction effect of this embodiment. The measurement was carried out in an anechoic room, and a microphone was installed at a position 45 degrees and 30 cm rearward from the rear end of the vehicle AC generator, and the overall value was measured under no load. In the present embodiment, 80% of the inner peripheral surface of the coil end group of the stator winding faces the cooling fan, and a gap is formed between the coil ends of the coil end group. As shown in FIG. 7, both improved cooling and reduced fan noise can be achieved.

8 and 9, the stator 2 in which a gap is formed between the conductors of the coil end group is incorporated,
12000 when the outermost diameter R1 of the field iron core 7 of the rotor 3 is fixed and the outer diameter R0 of the cooling fans 12 and 13 is changed.
It shows the change in fan noise at rpm and the change in output at rated speed. When the ratio (R0 / R1) is 0.9 or more and 0.96 or less, the fan noise reduction effect can be ensured and a large output reduction can be suppressed.

From the viewpoint of vibration resistance, when the coil end group is coated with a thick resin film, the gap between the coil ends is lost. However, by adhering the thick resin film only to the tip end portion in the axial direction of the coil end group, it is possible to leave innumerable gaps as described above at the root of the coil end group. In such a configuration,
It is important that the range where a myriad of gaps are left faces the cooling fan with the above relationship.

Further, in consideration of the relationship with the shroud, it is important that the portions of the cooling fans 12, 13 exposed to the outside oppose the coil end group in a predetermined relationship. Further, when the edges of the outermost diameter portions of the cooling fans 12 and 13 are formed by oblique sides, it is important that the oblique sides face the inner peripheral surface of each coil end group in the above relationship.

[Second Embodiment] In the first embodiment, the segments formed so that the turn portions are multiplexed are used. However, as shown in FIGS. 10 and 11, the segments are arranged in different slots as an inner layer and an outer layer. A plurality of pairs of the segments 33 may be arranged by using the segment 33. Note that FIG. 10 shows a basic pair, and in order to set the number of electric conductors per slot to four as in the first embodiment, two pairs may be electrically connected in series. Also in this embodiment, a gap can be formed between each segment of the coil end group.

[Other Embodiments] In the first embodiment,
Although the structure of the stator winding in which the number of electric conductors per slot is 4 is shown, the number of electric conductors may be changed by changing the configuration of the segment according to the output specifications required for the generator. In the first embodiment, the cooling fans are arranged at both ends in the axial direction of the field iron core of the rotor, but the cooling performance has a margin in terms of the environment of the ambient temperature when mounted in the vehicle, the required power generation and the like. In this case, a configuration in which a cooling fan is provided on at least one side can be adopted. For example, since the ambient temperature of the generator is generally lower on the front side than on the rear side,
The front cooling fan 12 can be eliminated and only the rear cooling fan 13 can be used.

Of the two cooling fans provided at both ends of the field core, only one of them is a cooling fan having a number of blades different from the number of claws of the field core, and the other is a claw of the field core. A cooling fan having the same number of blades as the number may be used. It should be noted that the number of blades of the cooling fan can be selected according to the requirement of the cooling air volume, etc., under the condition that it is different from the number of claws of the field iron core. For example, if the number of nails is 8,
6, 7, 9, 10, etc. can be adopted. The number of blades of the cooling fan can be equal to or less than the number of claws of the field iron core. For example, if the number of nails is 8,
A combination can be selected in which the number of blades of the rear side cooling fan 13 is 7 and the number of blades of the front side cooling fan 12 is 8. Such a combination is suitable when the front cooling fan 12 is a cooling fan that promotes ventilation to the gap between the claws. By setting the number of blades of the front-side cooling fan 12 to be the same as the number of claws and positioning the blades on the back surface of the claws of the field iron core, it is possible to prevent the ventilation to the gap between the claws from being obstructed. In the first embodiment, the front cooling fan 12 is configured by mixing the fan blades of the centrifugal fan and the fan blades of the mixed flow fan, and the rear cooling fan 13 is configured by the fan blades of the centrifugal fan. There is. On the other hand, depending on the environment of the ambient temperature when mounted on a vehicle, all fan blades may be centrifugal fan blades, or all fan blades may be mixed flow fan blades. 12A and FIG.
(B) shows the front cooling fan 12 and the rear cooling fan 13 used in the first embodiment. This front side cooling fan 12 has two centrifugal fan blades and five mixed flow fan blades. Also,
The rear cooling fan 13 has seven axial fan blades.

Further, FIG. 12C shows a front side cooling fan 120 of a modified example. The front side cooling fan 120 has eight mixed flow fan blades. Each fan blade is located corresponding to the back surface of the claw of the field core. The front side cooling fan 120 of FIG. 12 (C) can be used in combination with the rear side cooling fan 13 of FIG. 12 (B). In the first embodiment, the turn portion side of the segment is arranged in the first coil end group and the joint portion side of the segment is arranged in the second coil end group, but the arrangement may be reversed.

In the first embodiment, the outermost diameter R1 of the field iron core is
Is 92 mm, the same setting range is effective when the outermost diameter R1 is 70 to 110 mm if the same ventilation cooling structure is used. Further, if the reinforcing ribs are not formed on the fan, the cooling air sucked in from the axial direction can be more smoothly changed in direction at the root portion of the blade and sent out to the outside in the radial direction. This advances to the coil end group in which the ventilation path is formed. Therefore, smooth ventilation is possible, and wind noise can be reduced.

Further, it is desirable that the gap formed between the coil ends forms a ventilation passage that completely penetrates the inside of the coil end group from the inner side to the outer side in the radial direction.
An oblique ventilation passage may be formed that extends at a predetermined angle in the radial direction. Alternatively, a resin film may be formed inside the coil end group, and a groove-shaped ventilation passage may be formed between the coil ends only on the inner peripheral surface of the coil end group.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of a vehicle AC generator according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the stator of the first embodiment.

FIG. 3 is a schematic perspective view of a segment of the first embodiment.

FIG. 4 is a schematic view showing how the segments of the first embodiment are attached to the stator core.

FIG. 5 is a perspective view showing how the segments of the first embodiment are attached to the stator core.

FIG. 6 is a diagram showing a cooling property improving effect of the stator winding of the first embodiment.

FIG. 7 is a diagram showing a fan noise reduction effect of the first embodiment.

FIG. 8 is a diagram showing a change in fan noise according to the first embodiment.

FIG. 9 is a diagram showing an output change of the first embodiment.

FIG. 10 is a schematic perspective view of a segment of the second embodiment.

FIG. 11 is a schematic diagram showing how the segments of the second embodiment are attached to the stator core.

FIG. 12 is a schematic view showing the blade arrangement of the cooling fan, wherein (A) and (B) show the cooling fan of the first embodiment, and (C) shows a cooling fan of a modified example.

FIG. 13 is a diagram showing a conventional vehicle alternator.

[Explanation of symbols]

1 Vehicle AC generator 2 stator 3 rotor 6 shafts 7 field iron core 8 field coil 9,10 slip ring 12 Front cooling fan 13 Rear cooling fan 31a First coil end group 31b Second coil end group 32 Stator core 33 segments 34 insulator

Continuation of the front page (56) Reference JP-A-7-222415 (JP, A) JP-A-5-111221 (JP, A) JP-A-4-190655 (JP, A) Actual Kaihei 5--11768 (JP , U) Actually open 2-33574 (JP, U) Actually open 58-153551 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 9/00-9/28 H02K 19/00-19/38

Claims (8)

(57) [Claims] 1. A stator comprising a stator core having a plurality of slots, and stator windings wound around the slots to form coil end groups at axially opposite ends of the stator core; In a vehicle AC generator having a field iron core having magnetic pole claws arranged to face each other on the circumferential side and a rotor provided with a cooling fan arranged at at least one axial end of the field iron core, 70% or more of the axial height of the coil end group arranged on the outer side in the radial direction overlaps with the cooling fan in the radial direction, and the cooling fan is arranged inside the coil end group. cooling air being air path through the formation by, and the Koiruen
Has a skewed portion that extends obliquely with respect to the axial direction.
Between a plurality of skewed parts included in the coil end group
An alternating current generator for a vehicle, wherein the ventilation passage is formed . 2. The vehicle alternator according to claim 1, wherein the coil end group is formed by repeatedly arranging coil ends having a constant shape. 3. The outer diameter of the cooling fan according to claim 1, which is 90% or more and 96% or less of the outermost diameter of the field core of the rotor. AC generator for vehicles. 4. The stator winding according to claim 1, wherein the stator winding has an inner diameter in a radial direction of the stator core.
The innermost layer, the inner middle layer, the outer middle layer, and the outermost layer are arranged in this order from the side.
A vehicle alternator characterized by being arranged in rows. 5. The electric conductor of the inner end layer and the electric conductor of the outer end layer according to claim 4, wherein
Providing with a large segment formed by forming the conductor into an almost U shape
The electrical conductor of the inner middle layer and the electrical conductor of the outer middle layer are provided as a series of electrical conductors.
Provided by a small segment formed by shaping the body into a U shape
An alternator for vehicles, which is characterized in that 6. The method of claim 5, wherein the large and small segments are contained within a slot.
Along with the part that extends along the axial direction,
Including the oblique portion that extends by being inclined at a predetermined angle
AC generator for vehicles characterized by. 7. The claim 1 6, wherein the number of blades of the cooling fan for a vehicle AC generator, characterized in that different from the pawl speed of the cooling fan is arranged field core. 8. The cooling fan according to claim 7 , wherein the cooling fan is provided at one axial end of the field iron core, and the other cooling fan is provided at the other axial end of the field iron core. An alternator for a vehicle, comprising a fan.