KR100576227B1 - Alternator - Google Patents

Abstract

 Acquire a vehicle alternator that can realize high output and high efficiency and can reduce noise. In the multiphase stator winding 16, the long wire 30 is folded outside the slot 15a on the end face of the stator core 15, so that the inner and outer layers are alternately adopted in the depth direction of the slot 15a. The turn portions 30a of the element wires 30 folded outside the slots on the cross-sectional side of the stator core 15 are arranged in equal pitch in the circumferential direction with substantially the same shape to form the coil end groups 16a and 16b, and the coil ends The groups 16a and 16b are arranged in a plurality of rows in the radial direction and are cooled in the radial direction generated by the fan 5 provided at the axial end of the rotor 7 opposite the coil end groups 16a and 16b. The wind D vents the coil end groups 16a and 16b.

Stator core, stator winding, slot, element wire.

Description

Automotive alternator {ALTERNATOR}             

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the structure of the vehicular alternator which concerns on Embodiment 1 of this invention.

Fig. 2 is a perspective view showing the rotor of the vehicular alternator according to Embodiment 1 of the present invention.

Fig. 3 is a perspective view showing a stator of the vehicular alternator according to Embodiment 1 of the present invention.

Fig. 4 is a plan view illustrating a connection state of one phase of the stator winding in the vehicular alternator according to Embodiment 1 of the present invention.

5 is a circuit diagram of a vehicular alternator according to Embodiment 1 of the present invention.

FIG. 6 is a view for explaining the manufacturing steps of the winding group constituting the stator winding applied to the vehicular alternator according to Embodiment 1 of the present invention. FIG.

FIG. 7 is a view for explaining the manufacturing steps of the winding group constituting the stator winding applied to the vehicular alternator according to Embodiment 1 of the present invention. FIG.

FIG. 8 is a view showing an element group on an inner layer side constituting a stator winding applied to an automotive alternator according to Embodiment 1 of the present invention. FIG.                 

Fig. 9 is a diagram showing an element group on the outer layer side constituting a stator winding applied to the vehicular alternator according to Embodiment 1 of the present invention.

Fig. 10 is a perspective view showing main parts of element wires constituting a stator winding applied to an automotive alternator according to Embodiment 1 of the present invention.

Fig. 11 is a diagram illustrating an arrangement of element wires for a stator winding applied to an automotive alternator according to Embodiment 1 of the present invention.

Fig. 12 is a diagram for explaining the structure of a stator core applied to this vehicle alternator.

Fig. 13 is a process sectional view for explaining a manufacturing process of a stator applied to this vehicle alternator.

Fig. 14 is a plan view showing the mounting state of the elementary wire group constituting the stator winding applied to this vehicle alternator to the iron core;

FIG. 15 is a cross-sectional view illustrating a manufacturing process of a stator applied to an automotive alternator according to Embodiment 1 of the present invention. FIG.

Fig. 16 is a sectional view showing a configuration of a vehicular alternator according to Embodiment 2 of the present invention.

Fig. 17 is a perspective view showing the rotor of the vehicular alternator.

18 is a cross-sectional view showing a configuration of a vehicular alternator according to Embodiment 3 of the present invention.

Fig. 19 is a sectional view showing the configuration of a vehicular alternator according to Embodiment 4 of the present invention.

Fig. 20 is a perspective view showing the stator of the vehicular alternator according to Embodiment 5 of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: front bracket, 1c: smooth surface,

2: rear bracket, 7: rotor,

8,8A, 8B: stator, 15: stator core,

15a: slot, 15b: opening,

16,16A: multiphase stator winding,

16a: front side coil end group,

16b: rear coil end group,

22,23: clonal stimulation,

22a, 22b: meat and meat part, 25: insulating resin,

30: wire, 30a: turn part,

30b: straight part,

31: first winding, 32: second winding,

33: winding 3, 34: winding 4,

101,102,103: shielding plate (planarization means), C, F: ventilation paths,

D, E: Cooling wind.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator mounted on a vehicle such as a passenger car or a truck and driven by an internal combustion engine, and more particularly to a vehicle alternator capable of realizing high output and high efficiency and reducing noise.

(Conventional technology)

For example, cooling wind is ventilated to the coil end which is a heat generating part to make a generator high power. In addition, in order to suppress wind noise caused by ventilation of this part, it is necessary to reduce the coil end which becomes a ventilation resistance. In other words, it is necessary to improve the spot ratio of the electric conductors stored in the magnetic circuit of the stator, and to align and increase the density of the bridge portions of the stator windings (bridge portions other than the stator cores are called coil ends).

Then, for example, Japanese Patent No. 2927288 proposes a structure for improving the dripping rate of the electric conductors and aligning and densifying the coil ends by using flat and short conductor segments in the stator electric conductors. .

However, because the windings of the stator described in this publication consist of a number of short segments, welds for connection are formed.

In addition, the presence of this weld had a limitation in lowering the height of the coil end and caused interference noise.

On the other hand, Japanese Patent Laid-Open No. 11-164519 discloses a technique for increasing the surface area exposed by varying the height of the coil in the axial direction in order to improve the cooling property of the coil end group.

However, this configuration has a limit in temperature reduction even if the coil end is increased in height, the copper loss is increased, the heat generation is increased, and the cooling property is increased.

In addition, since the area receiving the cooling wind with respect to the radial flow of the cooling wind from the fan is large, as a result, the coil end becomes the ventilation resistance, the pressure loss is increased, and the noise is worsened.

The present invention has been invented to solve the above problems, and an object of the present invention is to obtain an automotive alternator capable of realizing high output and high efficiency and reducing noise.

delete

The automotive alternator according to the present invention includes a rotor, a stator core disposed opposite to the rotor, a stator having a multiphase stator winding mounted to the stator core, and a vehicle alternator having a bracket for storing and supporting the rotor and the stator. In the stator core, a plurality of slots extending in the axial direction are formed in a predetermined pitch in the circumferential direction, and in the multiphase stator winding, the long wires are folded out of the slots on the cross-sectional side of the stator core so that the slot depths in the slots are predetermined in each slot. It is recommended to adopt the inner and outer layers alternately.In the slot of the stator core, a plurality of wires are arranged in one row in the radial direction, and the turns of the wires folded outside the slot on the cross section side of the stator core have the same shape and have the same pitch in the circumferential direction. Aligned to form a coil end group, the coil end group is arranged in a plurality of rows in the radial direction, The cooling wind flowing in the radial direction generated by the fan provided at the axial end of the rotor facing the air vents the coil end group.

In addition, the magnetic pole of the rotor is a claw pole, the fan is provided at the axial end of the claw pole, the shoulder portion of the claw pole is disposed opposite the coil end group, and the fan is the semi-fixed iron core side of the coil end group. It faces the ventilation path formed in.

In addition, the shoulder portion of the claw pole is provided with a straight section or a curved section of the cross section, and the intersection between the outermost surface of the rotor and the ridge line of the section is coincident with the cross section of the stator core.

In addition, the shoulder portion of the claw pole is provided with a straight or cross-sectioned slender portion, and the outer diameter of the fan coincides with the intersection of the end face in the axial direction of the claw pole and the ridge line of the flesh pole.

In addition, the shoulder portion of the claw pole is provided with a straight section or a curved section of the claw, and the intersection of the outermost surface of the rotor and the ridge of the ridge portion coincides with the cross section of the stator core and the axial end of the claw pole. The outer diameter of the fan coincides with the intersection of the ridgeline of the sixth side and the sixth side.

Moreover, the fan is provided so that the wing surface may be inclined toward the fleshing part side.

Moreover, the opposing part of a fan in a bracket is a substantially empty space.

Moreover, the planarization means is provided in the inner peripheral part of the coil end group.

Moreover, the planarization means is provided in the top part of a coil end group.

Further, planarization means are provided in the inner circumferential portion and the top of the coil end group.

Moreover, the part which faces the coil end group of a bracket becomes a smooth surface, and the cooling path ventilation path is formed in the smooth surface and the top of a coil end group.

[Embodiment of the Invention]

Embodiment 1.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the structure of the vehicular alternator which concerns on Embodiment 1 of this invention.

2 is a perspective view showing the rotor of the vehicular alternator;

3 is a perspective view showing a stator of the vehicular alternator;

Fig. 4 is a plan view for explaining a connection state of one phase of the stator winding in this vehicle alternator.

5 is a circuit diagram of this vehicle alternator.

6 and 7 are diagrams for explaining a manufacturing process of the winding group constituting the stator winding applied to this vehicle alternator.

Fig. 8 is a diagram showing a group of ships on the inner layer side constituting the stator winding applied to this vehicle alternator,

Fig. 8A is a side view thereof and Fig. 8B is a plan view thereof.

FIG. 9 is a view showing a group of wires on the outer layer side constituting a stator winding applied to the vehicle alternator, FIG. 9A is a side view thereof, and FIG. 9B is a plan view thereof.

Fig. 10 is a perspective view showing the main parts of element wires constituting a stator winding applied to this vehicle alternator.

FIG. 11 is a view for explaining an arrangement of element wires constituting a stator winding applied to the vehicle alternator. FIG.

FIG. 12 is a view for explaining the structure of the stator core applied to the vehicular alternator, FIG. 12A is a side view thereof, and FIG. 12B is a rear view thereof.

Fig. 13 is a process sectional view for explaining a manufacturing process of a stator applied to this vehicle alternator.

Fig. 14 is a plan view showing the mounting state of the elementary wire group constituting the stator winding applied to the vehicular alternator to the iron core.

Fig. 15 is a process sectional view for explaining a manufacturing process of the stator applied to the vehicular alternator.

In FIG. 3, lead wires and bridge wires are omitted.

In Fig. 1, a vehicle alternator has a rotor material through a shaft (6) in a case (3) in which a rotor (Lundell Type) rotor (7) is composed of an aluminum front bracket (1) and a rear bracket (2). The stator 8 is fixed to the inner wall surface of the case 3 so that the stator 8 covers the outer peripheral side of the rotor 7.

The shaft 6 is rotatably supported by the front bracket 1 and the rear bracket 2.

The pulley 4 is fixed to one end of the shaft 6 so that the rotational torque of the engine can be transmitted to the shaft 6 through the belt.

A brush disposed in the case 3 so that a slip ring 9 for supplying current to the rotor 7 is fixed to the other end of the shaft 6 and a pair of brushes 10 slide on the slip ring 9. It is stored in the holder 11.

A regulator 18 for adjusting the magnitude of the alternating voltage generated by the stator 8 is adhered to the heat sink 17 fitted to the brush holder 11. A rectifier 12 electrically connected to the stator 8 and rectifying the alternating current generated by the stator 8 with a direct current is mounted in the case 3.

In FIG. 2, the rotor 7 is installed to cover the rotor coil 13 and the rotor coil 13 which generate magnetic flux by flowing an electric current, and by the magnetic flux generated by the rotor coil 13. It is composed of a pair of pole cores 20 and 21 in which magnetic poles are formed.

The pair of pole cores 20 and 21 are made of iron, and each of the eight claw poles 22 and 23 protrudes at an equiangular pitch in the circumferential direction on the outer circumferential edge, and engages the claw poles 22 and 23. To the shaft 6.

In addition, the fan 5 is fixed to both ends in the axial direction of the rotor 7.

In FIG. 1, the intake holes 1a and 2a are provided at the axial ends of the front bracket 1 and the rear bracket 2, and the exhaust holes 1b and 2b are the front bracket 1 and the rear bracket 2, respectively. Is provided so as to face the radially outer side of the coil end groups 16a and 16b on the front side and the rear side of the stator winding 16 of the outer peripheral shoulder portion.

As shown in Fig. 3, the stator 8 includes stator cores 15 and cylindrical stator cores each having a plurality of cylindrical laminations formed at a predetermined pitch in the circumferential direction with a plurality of slots 15a extending in the axial direction. A recommended multiphase stator winding 16 and an insulator 19 mounted in each slot 15a to electrically insulate the multiphase stator winding 16 and the stator core 15 are provided.

In the multiphase stator winding group 16, one element wire 30 is folded out of the slot 15a on the cross-sectional side of the stator core 15, and the inner layer is formed in the depth direction of the slot in the slot 15a every predetermined number of slots. It is equipped with a plurality of windings recommended as a waveform to alternate between the outer layer and the outer layer.

Here, 96 slots 15a are formed at equal intervals in the stator core 15 so as to accommodate two sets of three-phase stator windings 160 corresponding to the number of magnetic poles of the rotor 7.

As the element wire 30, a long copper wire material with an insulating coated long direction cross section is used, for example.

Next, a winding structure of the stator winding group 161 for one phase will be described in detail with reference to FIG.

The stator winding group 161 of one phase is comprised from the 1st-4th windings 31-34 which become one element wire 30, respectively.

In addition, the first winding 31 waveforms one element wire 30 alternately adopting the first position on the outer circumferential side and the second position on the outer circumferential side in the slot 15a every 6 slots from slot numbers 1 to 91. It is wound up.

The second winding 32 winds the element wire 30 in a waveform so as to alternately adopt the second position on the outer circumference side and the first position on the outer circumference side in the slot 15a every six slots from slot numbers 1 to 91. Consists of.

The third winding 33 winds the element wire 30 in a waveform so as to alternately adopt the third position on the outer circumferential side and the fourth position on the outer circumferential side in the slot 15a every 6 slots from slot numbers 1 to 91. Consists of.

The fourth winding 34 winds the element wire 30 in a waveform so as to alternately adopt the fourth position on the outer circumference side and the third position on the outer circumference side in the slot 15a every six slots from slot numbers 1 to 91. It is composed.

In each slot 15a, four wires 30 are arranged side by side in the longitudinal direction in the longitudinal direction of the longitudinal cross section, and four are arranged side by side in the radial direction.

At one end of the stator core 15, an end 31a of the first winding 31 extending from slot number 1 and an end 33b of the third winding 33 extending from slot number 91 are formed. Is joined, and the end 33a of the third winding 33 extending from the slot number 1 again and the end 31b of the first winding 31 extending from the slot number 91 are joined to each other to make two turns. ) Winding is formed.

In addition, a portion of the element wire 30 of the second winding 32 extending to one end side of the stator core 15 in slot numbers 61 and 67 is cut, and one end of the stator core 15 in slot numbers 67 and 73 is cut off. The part of the element wire 30 of the 1st winding 31 extended to the side is cut | disconnected. Then, one cut of four turns is obtained by joining the cut end portion 31c of the first winding 31 and the cut end portion 32c of the second winding 32 to connect the first to fourth windings 31 to 34 in series. The stator winding group 161 is formed.

Moreover, the junction part of the cut end part 31c of the 1st winding 31 and the cut end part 32c of the 2nd winding 32 becomes a bridge connection connection part, The cut end part 31d of the 1st winding 31 and the 2nd The cut ends 32d of the windings 32 become lead wires O and neutral points N, respectively.

In this manner, the stator windings 161 for six phases are formed by shifting the slots 15a for which the element wires 30 are recommended one by one.

As shown in FIG. 5, the stator winding group 161 is molded by three phases to form two sets of three-phase stator winding groups 160, and each of the three phase stator winding groups 160 is formed. Are respectively connected to the rectifier 12. The DC outputs of each rectifier 12 are connected in parallel and synthesized.

Here, each element wire 30 constituting the first to fourth windings 31 to 34 extends from one slot 15a to the cross-sectional side of the stator core 15 and is folded into a slot 15a spaced six slots apart. Recommended as a waveform winding to enter.

In addition, each element wire 30 is recommended to alternately adopt an inner layer and an outer layer in the slot depth direction (diameter direction) every six slots.

The turn part 30a of the element wire 30 which is extended to the end surface side of the stator core 15 and forms the coil end forms the coil end.

Thus, the turn portions 30a formed in the same shape at both ends of the stator core 15 are spaced apart from each other in the circumferential direction and in the radial direction so as to be arranged in two rows and arranged in the circumferential direction so as to form the coil end groups 16a and 16b. Doing.

A method of assembling the stator 8 will be described in detail with reference to FIGS. 6 to 15. As shown in FIG. 6, twelve long wires 30 are simultaneously bent in a zigzag shape on the same plane.

Subsequently, as shown by the arrow of FIG. 7, the element group 35A as shown in FIG. 8 is produced by folding by a jig | tool in the perpendicular direction.

In this manner, as shown in Fig. 9, an element group 35B having a bridge connection and a lead wire is produced.

And in order to easily shape the iron core 36 equipped with element group 35A, 35B to annular shape, the element wire winding 35A, 35B is annealed at 300 degreeC for 10 minutes.

In addition, each element wire 30 is bent in a planar pattern in which the straight portions 30b connected to the turn portions 30a are arranged in six slot pitches 6P, as shown in FIG.

The straight portion 30b is shifted by the width W of the element wire 30 by the turn portion 30a.

In the element group 35A and 35B, the element pairs in which the two element lines 30 formed in such a pattern are shifted by 6 slot pitches as shown in FIG. 11 are arranged so that the linear portions 30b are overlapped are shifted by one slot pitch. 6 pairs are arranged.

And the end part of the element wire | wire 30 is extended by 6 by the both sides of the both ends of element wire group 35A, 35B.

The turn portions 30a are arranged on both sides of the element wire groups 35A and 35B. In addition, a predetermined number of SPCC materials having a trapezoidal slot 36a formed at a predetermined pitch (30 degrees in electrical angle) are laminated, and the outer peripheral portion thereof is laser welded to produce an iron core 36 of a rectangular parallelepiped as shown in FIG.

As shown in Fig. 13A, an insulator 19 is mounted in the slot 36a of the iron core 36, and each straight line portion of the two element groups 35A and 35B is superposed in each slot 36a. .

For this reason, as shown in FIG.13 (b), two element group 35A, 35B is attached to the iron core 36. As shown in FIG.

At this time, the linear part 30b of the element wire 30 is insulated from the iron core 36 by the insulator 19, and 4 pieces are aligned and accommodated in the slot 15a in the radial direction.

In addition, two element group 35A, 35B is attached to the iron core 36 so that it may overlap as shown in FIG.

Next, the iron core 36 is rounded, the end surfaces thereof are brought into contact with each other, and welded to obtain a cylindrical iron core 37 as shown in Fig. 13C. By rounding the iron core 36, the slot 36a (corresponding to the slot 15a of the stator iron core) becomes a rectangular cross-sectional shape, and the opening 36b (corresponding to the opening 15b of the slot 15a) is a straight line. It becomes smaller than the slot width direction dimension of the part 30b.

The stator winding group 161 is formed by connecting end portions of the respective element wires 30 according to the connection method shown in FIG. 4.

Then, the iron core 37 is inserted into the cylindrical sheath core 38 in which the SPCC material is laminated, and then shrinkage-bonded and integrated to obtain the stator 8 shown in FIG.

Here, the iron core 37 and the outer core 38 integrated together correspond to the stator core 15.

In the vehicle alternator configured as described above, current is supplied from the battery (not shown) to the rotor coil 13 through the brush 10 and the slip ring 9, and magnetic flux is generated.

This magnetic flux causes the clot pole 22 of one pole core 20 to magnetize to the N pole, and the close pole 23 of the other pole core 21 magnetizes to the pole S.

On the other hand, the engine rotation torque is transmitted to the shaft 6 through the belt and the pulley 4 and rotated with the rotor 7.

Thus, a rotating magnetic field is applied to the multiphase stator winding 16 and electromotive force is generated in the multiphase stator winding 16.

The AC electromotive force is rectified to DC through the rectifier 12, the size thereof is adjusted by the regulator 18 and charged in the battery.

On the rear side, the outside air is sucked by the rotation of the fan 5 through the intake hole 2a provided to face the heat sink of the rectifier 12 and the heat sink 17 of the regulator 18, and the shaft 6 After cooling the rectifier 12 and the regulator 18 along the axis of the fan, bent in the centrifugal direction by the fan 5 to cool the rear coil end group 16b of the multiphase stator winding 16, It is discharged to the outside in (2b).

On the front side, on the front side, the outside air is sucked in the axial direction by the rotation of the fan 5 in the intake hole 1a, and then bent in the centrifugal direction by the fan 5 so that the front side coil end group of the multiphase stator winding 16 Cooling 16a is discharged | emitted from the exhaust hole 1b to the outside.

As described above, according to the first embodiment, the vehicular alternator according to the present invention includes a rotor 7, a stator core 15 and a stator core 15 arranged opposite to the rotor 7. In a vehicular alternator having a stator 8 having a winding 16 and brackets 1 and 2 for receiving and supporting the rotor 7 and the stator 8, the stator core 15 is in the axial direction. A plurality of elongated slots 15a are formed at a predetermined pitch in the circumferential direction, and in the multiphase stator winding 16, a long element wire 30 is folded outside the slot 15a on the end face side of the stator core 15 so that a predetermined slot 15a is formed. ) It is recommended to alternately adopt the inner layer and the outer layer in the slot 15a depth direction from the inside of the slot 15a every other number, and the plurality of element wires 30 are radially inside the slot 15a of the stator core 15. The turn portions 30a of the element wires 30 which are aligned in one row and folded outside the slots 15a of the cross section side of the stator core 15 have the same shape. The coil end groups 16a and 16b are constituted with equal pitches in the direction, and the coil end groups 16a and 16b are arranged in two rows in the radial direction and are opposed to the coil end groups 16a and 16b. The cooling wind flowing in the radial direction generated by the fan 5 provided at the axial end portion vents the coil end groups 16a and 16b.

In the multiphase stator winding 16, the long wire 30 is folded out of the slot 15a on the cross-sectional side of the stator core 15 so that the slot 15a is in the depth direction of the slot 15a for each of the predetermined slots 15a. Since it is recommended to adopt the inner and outer layers alternately, there is no welding point, and the height of the coil end can be lowered, the copper loss of the coil can be reduced, and the temperature, output, and efficiency can be improved.

In addition, the interference noise of the coil end installed in the ventilation path of the cooling wind can be reduced and the noise can be reduced.

In addition, since the inner and outer pairs of turn portions 30a are arranged in two rows in the radial direction without overlapping in the axial direction, the axial direction of the coils of the coil end groups 16a and 16b in two rows with respect to the radial flow of the cooling wind. The surface portion and the circumferential surface portion are exposed and the cooling property is good.

Further, the magnetic poles of the rotor 7 are the close poles 22 and 23, and the fan 5 is provided at the axial ends of the close poles 22 and 23, and the shoulders of the close poles 22 and 23 are the same. The part is disposed opposite to the coil end groups 16a and 16b, and the fan 5 is opposed to the ventilation path C formed on the anti-stator iron core side of the coil end groups 16a and 16b. And the close-up magnetic poles 22 and 23 are provided with the air cooling function which sends a wind to the coil end groups 16a and 16b similarly to the fan 5, and cools the coil end groups 16a and 16b.

And the fan 5 is opposed to the ventilation path C of the cooling wind formed in the semi-stator iron core side of the coil end group 16a, 16b, and this cooling path (C) has a rapid cooling speed (speed) in the radial direction ( D) (indicated by a solid line in FIG. 1), the low pressure in the ventilation path C is generated, and the above-described coil end groups 16a and 16b are generated by the shoulder portions of the close-up magnetic poles 22 and 23. Cooling wind E (indicated by the dotted line in Fig. 1) for cooling the water is attracted to improve the cooling property. In the brackets 1 and 2, the opposing portions of the fan (that is, the ventilation path c) are spaces only. Since the space is provided in the opposing part of the fan 5 and there is no opposing obstacle, the pressure loss of the fan 5 is reduced, the interference noise is reduced, and the cooling wind z in the coil end groups 16a and 16b is reduced. It is attracted and the cooling is improved.

In addition, a portion of the bracket 1 that faces the coil end groups 16a and 16b becomes a smooth surface 1c, and cooling air D flows through the top of the smooth surface 1c and the coil end groups 16a and 16b. Blowing path C is formed.

For this reason, the smooth surface 1c does not disturb the flow of cooling wind D. FIG.

As a result, interference noises to the brackets 1 and 2 of the cooling wind D are reduced. Furthermore, the cooling wind D is rectified by the smooth surface 1c and the cooling property is improved.

In the above embodiment, the stator core is provided with an outer core but the outer core may be omitted.

According to such a structure, the insertion process of an exterior iron core is skipped, productivity improves, and the deterioration of the thermal conductivity in an iron core produced by the clearance between internal and external iron cores, output reduction, and electronic musicification can be suppressed.

In the above embodiment, the case where the copper wire of the longitudinal cross section is used as the element wire has been described, but the element wire is not limited to the copper wire of the longitudinal cross section, for example, the copper wire of the circular cross section may be partially or may be partially. When the circular cross-sectional shape is applied to the cross-ventilated portion, the ventilation resistance due to passage is reduced, and the cooling performance is further improved. In addition, since the formability of the element wire is improved, excretion and connection of the element wire are easy, and workability is further improved. Furthermore, the element wire is not limited to the copper wire and may be an aluminum wire.

Embodiment 2.

Fig. 16 is a sectional view showing a configuration of a vehicular alternator according to Embodiment 2 of the present invention.

Fig. 17 is a perspective view showing the rotor of the vehicular alternator.

In the present embodiment, three element groups are superimposed on the stator core 15.

For this reason, in the coil end groups 16a and 16b, the turn part 30a is formed in three rows. In addition, the shoulder parts of the close-up magnetic poles 22 and 23 are cut in a straight line (taper shape), and the fleshing parts 22a and 23a are provided. The fan 5 is smaller in diameter than the first embodiment, and is retracted and mounted by the size of the fleshing parts 22a and 23a.

For this reason, in the present embodiment, the three rows of turn portions 30a are efficiently cooled against the radial flow of the cooling wind.

Moreover, the ventilation path is enlarged and the cooling property is improved by the meat removal part 22a of the claw poles 22 and 23. As shown in FIG.

For this reason, even the small fan 5 exhibits sufficient cooling.

In addition, since the ventilation path is enlarged, the ventilation resistance is further reduced to reduce noise.

As described above, according to the second embodiment, the sectional pole portions 22a, 23a are provided in the shoulder portions of the close-up poles 22, 23, and the outermost mirror surface 7a and the flesh portion of the rotor 7 are provided. The intersection portions G of the ridge lines 22a and 23a coincide with the end faces of the corrector core 15.

As a result of the formation of the fleshing parts 22a and 23a, a space extending annularly in the circumferential direction is formed.

Since this space becomes the ventilation path F adjacent to the ventilation path C, the circumferential component of the cooling wind D increases, and the cooling property by the circumferential component of the cooling wind D can be improved.

This improves the cooling performance without impairing the blowing cooling function of the shoulders of the claw poles 22 and 23.

In addition, since the circumference of the outer circumferential portion of the cross section of the stator core 15 and the ridge of the sixth portion are aligned in the circumferential direction, interference noise is reduced.

In addition, according to the second embodiment, the outer diameter of the fan 5 substantially coincides with the axial end surfaces of the claw poles 22 and 23 and the intersection portion H of the ridge lines of the fleshing parts 22a and 23a.

In general, the fan 5 has a large amount of momentum on the outermost diameter side and a large speed of the cooling wind, so that the discharge-side resistance is a factor that greatly worsens the pressure loss.

On the other hand, a space extending annularly in the circumferential direction is formed on the outer side in the radial direction of the fan 5 as a result of the fleshing parts 22a and 23a.

The outer diameter of the fan 5 coincides with the axial end faces of the claw poles 22 and 23 and the intersection portion H of the ridge lines of the fleshing parts 22a and 23a, and the fan 5 faces the space. Therefore, when the cooling wind is discharged from the fan, the ventilation path is enlarged, the pressure loss on the discharge side of the fan 5 is reduced, and the cooling property is improved.

In this way, the cooling property can be ensured and the fan 5 can be made small in diameter, so that the noise can be reduced.

In addition, in the present embodiment, the fleshing parts 22a and 23a are formed in a cross-sectional straight shape, but the present invention is not limited thereto, and may be curved as the radius of curvature increases.

In this case, it is the same with the cotton ear.

Embodiment 3.

18 is a cross-sectional view showing a configuration of a vehicular alternator according to Embodiment 3 of the present invention.

In the present embodiment, the shield plate 101 is provided on the inner circumference of the coil end group as the planarization means.

Other configurations are the same as those in the second embodiment.

In the vehicular AC generator of Embodiment 3 having such a configuration, since the shield plate 101 is provided at the inner circumference of the coil end groups 16a and 16b, the interference sound can be reduced.

In addition, the turn parts 30a arranged in three rows are arranged in the radial direction without overlapping in the axial direction, and are coiled by the action of the shield plate 101 which is disposed to face the radial flow of the cooling wind D. The inside of the end becomes low pressure and a part of the cooling wind D flows in from the top of the coil end, and at the same time, the flow is attracted from the outside in the coil end and the cooling property can be improved.

Although the planarization means of this embodiment is implemented by the shield plate 101, the planarization means is not limited to this shield plate 101. As shown in FIG. For example, the planar surface of the mold resin covering the coil end groups 16a and 16b may be smoothed and provided.

Embodiment 4.

Fig. 19 is a sectional view showing a configuration of a vehicular alternator according to Embodiment 4 of the present invention.

In the present embodiment, the shield plate 102 is provided on the top of the coil end group as the planarization means.

Moreover, as for the front side fan 5, the wing surface is inclined toward the fleshing part 22a side.

Other configurations are the same as those in the second embodiment.

In the vehicular AC generator according to the fourth embodiment having such a configuration, since the shield plate 102 is provided at the top of the coil end groups 16a and 16b, the interference sound can be reduced.

In addition, the turn portions 30a arranged in three rows are arranged to be aligned in the radial direction without overlapping in the axial direction, and since the above-described shielding plate 102 is provided, the shielding plate 102 is formed by the cooling wind D. Since the guided air is reliably ventilated without obstructing the cooling wind D, it is possible to improve cooling performance.

Moreover, the fan 5 is provided with the wing surface inclined toward the fleshing part 22a side, and as a result of the fleshing part 22a, the coil end group of cooling winds through the ventilation path F extended annularly in the circumferential direction formed ( 16a, 16b) directly contact the component increases, the axial flow component is increased by the inclined blade surface against the flow of cooling wind in the radial direction, and the cooling wind flows from the inner circumference of the coil end to the circumferential direction has sufficient cooling properties .

Embodiment 5.

20 is a perspective view showing a stator of the vehicular alternator according to Embodiment 5 of the present invention.

In the present embodiment, the shield plate 103 is provided on the inner circumferential portion and the top of the coil end groups 16a and 16b as planarization means.

The boundary between the inner circumference and the top of the shield plate 103 is smoothly connected. A plurality of holes are formed in the shield plate 103.

Other configurations are the same as those in the second embodiment.

In the vehicular AC generator of Embodiment 5 having such a configuration, since the shield plate 103 is provided at the inner circumference and the top of the coil end groups 16a and 16b, the interference noise can be further reduced.

In addition, the pair of inner and outer turn portions are arranged in the radial direction without overlapping in the axial direction, and furthermore, since the above-described shield plate 103 is provided, the shield plate 103 serves as a guide for the cooling wind, and the cooling wind in the radial direction is coiled. Since the cooling wind is generated in the outer coil by attracting the top of the end, the cooling air can be surely ventilated without being obstructed on the way, thereby improving the cooling performance.

The automotive alternator according to the present invention includes a rotor, a stator core disposed opposite to the rotor, a stator having a multiphase stator winding mounted to the stator core, and a vehicle alternator having a bracket for receiving and holding the rotor and the stator. The stator core has a plurality of slots extending in the axial direction at a predetermined pitch in the circumferential direction, and in the multiphase stator winding, the long wires are folded outside the slots on the cross section side of the stator core, and the inner layer is arranged in the slot depth direction in the slot for each predetermined number of slots. It is recommended that the outer layer and the outer layer are alternately selected.In the slot of the stator core, a plurality of element wires are arranged in a row in the radial direction, and the turns of the element wires folded outside the slot on the end side of the stator core are aligned in the same shape in the circumferential direction. Are arranged to form a coil end group, and a plurality of coil end groups are arranged in a radial direction, and the coil end group The cooling wind flowing in the radial direction generated by the fan provided at the axial end of the rotor opposite to the air vents the coil end group.

For this reason, the multi-phase stator winding is recommended to adopt the inner layer and the outer layer alternately in the slot depth direction within the slot for every predetermined number of slots because the long wire is folded outside the slot of the stator core. It can lower, reduce copper loss of coil, improve temperature, output and efficiency.

In addition, it is possible to reduce the interference sound of the coil end group installed in the ventilation path of the cooling wind and to reduce the noise.

In addition, since the inner and outer pairs are arranged in the radial direction without overlapping in the axial direction, the axial surface portion and the circumferential surface portion of the coil of the coil end group are exposed to the radial flow of the cooling wind, and the cooling performance is good.

In addition, the magnetic pole of the rotor is a claw pole, the fan is provided at the axial end of the claw pole, the shoulder portion of the claw pole is disposed opposite to the coil end group, and the fan is placed on the semi-stator iron core side of the coil end group. Since it is opposed to the ventilation path to be formed, the claw pole has a cooling function to cool the coil end group.

The fan is opposed to the ventilation path of the cooling wind formed on the semi-stator iron core side of the coil end group, and the cooling fan is ventilated at a high speed in this ventilation path, so low pressure is generated in the ventilation path, and it is caused by the shoulder part of the claw pole. Cooling wind for cooling the coil end group is attracted to improve the cooling.

In addition, the claw magnetic pole shoulder portion is provided with a straight section or a curved curved section, and the intersection between the outermost surface of the rotor and the ridge line of the flesh section is matched with the cross section of the stator core, so that the annular section is annular in the circumferential direction as a result of the formation of the flesh section. A space extending to is formed.

Since this space becomes a ventilation path, the circumferential component of the cooling wind increases, and the cooling property by the circumferential component of the cooling wind can be improved. Thus, the cooling performance can be improved without impairing the blowing cooling function of the shoulder portion of the claw stimulus.

In addition, since the circumference of the outer circumferential portion of the cross section of the stator core coincides with the ridge line in the circumferential direction, interference noise is reduced.

In addition, the shoulder portion of the claw pole is provided with a straight line section or a cross section curved section, and the outer diameter of the fan coincides with the intersection of the axial end face of the claw pole with the ridge line of the blade pole. As a result of the formation of the fleshing portion, a space extending in the circumferential direction is formed outside the radial direction of the fan.

Since the fan has the greatest momentum on the outermost side and the speed of the cooling wind is high, the resistance on the discharge side is a factor which greatly worsens the pressure loss.

For this reason, the outer diameter of the fan coincides with the axial end surface of the claw pole and the ridge line of the fleshing part. Since the fan faces the space, the ventilation path is enlarged when the cooling air is released from the fan, and the pressure loss on the discharge side of the fan is increased. This is reduced and the cooling property is improved.

In this way, the cooling property can be ensured, and the fan can be made small, so that the noise can be reduced.

In addition, a claw-shaped magnetic pole shoulder portion is provided with a sectional straight line or a sectional curved portion, and the intersection of the outermost surface of the rotor and the ridgeline of the ridge portion coincides with the cross-section of the stator core, and the axial end face of the claw magnetic pole. Since the outer diameter of the fan coincides with the ridge line of the ridge of the flesh, a space extending in the circumferential direction is formed in the circumferential direction as a result of the formation of the flesh.

Since this space becomes a ventilation path, the circumferential component of a cooling wind increases and the cooling property by the circumferential component of a cooling wind can be improved. Thus, the cooling performance can be improved without impairing the blowing cooling function of the shoulder portion of the claw stimulus. In addition, since the circumference of the outer circumferential portion of the cross section of the stator core and the ridge line of the sixth portion coincide in the circumferential direction, interference noise is reduced.

In addition, since the fan is opposed to the above-mentioned space, when the cooling wind comes out of the fan, the ventilation path is enlarged, the pressure loss on the discharge side of the fan is reduced, and the cooling property is improved.

In this way, the cooling property can be ensured, and the fan can be made small, so that the noise can be reduced.

In addition, since the fan surface is inclined toward the fleshing part side, the component directly contacting the coil end group of the cooling wind increases through the ventilation path extending in the circumferential direction as a result of the formation of the fleshing part, and the cooling performance is improved.

Moreover, the opposing part of a fan in a bracket is a substantially empty space.

For this reason, a space is provided in the opposing part of the fan, and since there is no opposing obstacle, the pressure loss on the discharge side of the fan is reduced, the interference noise is reduced, and the cooling wind in the coil end group is attracted to improve the cooling performance.

Moreover, since the flattening means is provided in the inner circumference of the coil end group, the inner circumference of the coil end group becomes flat, so that the interference noise is reduced.

In addition, the inner and outer pairs of turn portions are arranged in the radial direction without overlapping in the axial direction, and the coil end group has a low pressure due to the flattening means which are opposed to each other, and a part of the radial flow flows in from the top of the coil end portion. At the same time, the flow from the outside in the coil end group is attracted and cooling can be improved.

In addition, since the flattening means is provided at the top of the coil end group, the top of the coil end group becomes flat, so that the interference noise can be reduced. In addition, the pair of inner and outer turn portions are arranged in the radial direction without overlapping in the axial direction, and furthermore, since the above-described flattening means is provided, the flattening means serves as a guide of the cooling wind, and the ventilation wind is surely ventilated without obstructing the way Therefore, cooling performance can be improved.

In addition, since the flattening means is provided at the inner circumference and the top of the coil end group, the inner circumference and the top of the coil end group become flat, whereby interference noise can be further reduced.

In addition, since the pair of inner and outer turns are arranged in the radial direction without overlapping in the axial direction, and the planarization means described above is further provided, the planarization means serves as a guide for the cooling wind, so that the cooling wind is not disturbed in the middle. Ventilation can improve cooling.

Moreover, the part facing the coil end group of the bracket becomes a smooth surface, and since the cooling air blow path is formed in the smooth surface and the top of the coil end group, the part facing the coil end group of the bracket becomes a smooth surface, An air blower for cooling wind is formed at the top of the coil end group. As a result, the interference sound to the bracket of the cooling wind is reduced. Furthermore, the cooling wind is rectified by the smooth surface and the cooling performance is improved.

Claims (3)

A rotor 7 comprising claw-shaped magnetic poles 22 and 23 having a shoulder portion; A stator (8) comprising a stator core (15) disposed opposite to the rotor (7) and a polyphase stator winding (16) provided at the stator core (15); And Brackets 1 and 2 supporting the rotor 7 and the stator 8 Including; The stator iron core 15 is formed with a plurality of slots 15a extending in the axial direction at a predetermined pitch in the circumferential direction, The multiphase stator winding 16 includes a plurality of winding portions, In each of the windings one wire strand 30 is recommended to alternately adopt an inner layer and an outer layer in the slot depth direction in the slot 15a every predetermined number of slots, The element wire 30 is folded back out of the slot at the axial end surface of the stator core 15 to form a turn portion 30a, The plurality of element wires 30 are arranged in a row in the radial direction inside the slot 15a of the stator core 15. The turn portion 30a of the element wire 30 is the same shape and is aligned at the same pitch in the circumferential direction to form the coil end groups 16a and 16b, The coil end groups 16a and 16b are arranged in a plurality of rows in the radial direction, Cooling air generated in the radial direction by the fan 5 provided at the end of the rotor 7 facing the coil end groups 16a and 16b and flowing in the radial direction ventilates the coil end groups 16a and 16b. In the automotive alternator, Cut-out portions 22a and 23a having a straight or curved cross-sectional shape are provided in the shoulder portions of the claw poles 22 and 23, The intersection of the outermost mirror surface 7a of the rotor 7 and the ridge line G of the ridge lines of the fleshing parts 22a and 22b substantially coincides with the end surface of the stator core 15. Vehicle alternator, characterized in that. The method of claim 1, The fan 5 is installed at the axial ends of the claw poles 22 and 23, and the shoulder portions of the claw poles 22 and 23 are disposed to face the coil end groups 16a and 16b. And the fan (5) is opposed to a ventilation path formed at the coil end group (16a, 16b) spaced apart from the stator core (15). The method according to claim 1 or 2, The intersection of the shaft end surface of the said claw pole (22, 23) and the ridgeline of the said fleshing part (22a, 23a) substantially matches the outer diameter of the said fan (5).

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