JPS61254040A - Rotor for ac generator for vehicle - Google Patents

Abstract

PURPOSE:To attenuate interference noise between a pole core and a stator, by inserting a spacer formed integrally with a bobbin wound up with the exciting coil of a rotor, between the clicks of the pole core. CONSTITUTION:After the output periphery of a bobbin 20 is wound up with an exciting coil 5, a spacer 30 is bent inside a hinge section 22 and is inserted into a pole core 1. The click 1-p of the pole core 1 is fitted on the concave section 30-a of the spacer 30. Then, a concave section 30-d is formed at the adjacent containing section 30-c of the spacer 30. After that, the click 1-p' of a pole core 1' is fitted on the concave section 30-d. Then, between the clicks 1-p, 1-p' of the pole core 1, 1', the curved surface sections 30-b are arranged, and so the outer peripheries of the clicks 1-p, 1-p' of the pole core 1, 1' and the curved surface sections 30-b of the spacer 30 are formed in a cylindrical shape without rugged sections.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotor for a vehicle alternator, and particularly to a pole core portion of the rotor.

[Summary of the invention]

The present invention provides a rotor for a vehicle alternator, in which a spacer integrally formed with a bobbin around which an excitation coil of the rotor is wound is inserted into a space between the pawls of a pole core, so that the outer circumference of the rotor is uneven. By creating a cylindrical shape with no cracks, it reduces noise in the high-speed rotation range due to interference between the pole core and the stay tape, and also prevents the bobbin from rotating and prevents disconnection and short circuits of the excitation coil. It was designed to do so.

[Conventional technology]

Conventionally, as a rotor for a vehicle alternator, a plurality of claw-shaped pole core parts protruding in the axial direction are provided on the outer periphery as described in Japanese Patent Laid-Open No. 58-79455 to improve the cooling effect. The formed pair of rotor cores is constructed by fitting the excitation coil fixed to the yoke onto the shaft so as to be sandwiched by the pair of rotor cores, and the pole cores of the pair of rotor cores are opposed to each other and mesh with each other. There are some types in which a cooling air path is formed along the side surface of the pole core.

[Problem that the invention seeks to solve]

However, in recent years, alternators have been made faster by increasing the pulley ratio in order to achieve small size, light weight, and high output. Two problems arise.

First, when the ball core rotates, centrifugal air is generated by the fan action on the side of the pole core, which causes pulsating pressure fluctuations between the stator and the pole core, which are caused by the teeth on the inner circumference of the stator. Noise caused by wind noise caused by interference with the uneven parts of the windshield.

Second, since the pole core of the rotor and the bobbin around which the excitation coil is wound are formed separately, as the rotation speed increases and decreases due to high-speed rotation, the inertia force increases.
Misalignment between the pole core and bobbin (bobbin rotation) occurs, and excessive tension is applied to the excitation coil inside the bobbin, resulting in disconnection or short circuit of the excitation coil.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a rotor for a vehicle alternator that reduces wind noise in a high-speed rotation range and prevents disconnection and short-circuiting of an excitation coil. It is.

[Means for solving problems]

A Lundell type pole core having a plurality of claws is arranged so as to mesh with each other alternately, and a rotor having an excitation coil wound inside the pole core, and a rotor arranged to face the rotor in the radial direction. A vehicular alternating current generator turtle comprising: a bobbin around which the excitation coil is wound; and a space formed integrally with the bobbin and facing at least the teeth. and a spacer made of a non-magnetic material so that the outer peripheral part of the rotor has a cylindrical shape without unevenness.

[Effect]

The spacer closes the space between the claws of the pole core,
Centrifugal wind is not generated due to the fan effect on the side surface of the pawl of the pole core, and the spacer and bobbin are integrally formed to prevent the bobbin and the pole core from rotating relative to each other.

〔Example〕

A pair of frames 9.9 forming the outer shell of the generator in Fig. 9
′ are both substantially bowl-shaped, and the opening sides are directly joined,
Multiple □ pairs of stud bolts 10 and nuts 8 (
In the drawing, only one pair is shown).

The stator 2 is press-fitted onto the inner periphery of the frame 9 using the stud bolts 10 .

The stator 2 is composed of a stator core 2-a and a stator coil 2-b wound around the stator core 2-a. The stator core 2-a has a plurality of conventionally known open-type teeth (magnetic pole teeth) 2-a'. (Fig. 10) toward the inner circumference.

A cylindrical bearing box 19.19 protrudes toward the inside of the generator at the center of the side surface of both frames 9.9'.
' is formed and said bearing bore, xl. , 19'C
A shaft 4 is rotatably supported by both bearings 11 and 11'.

The shaft 4 has a shaft 1 located inside the stator.
A pair of claw-shaped pole cores 1, 1' are mechanically fixed, and a conventionally known rotary heel 5 is sandwiched inside the pole cores 1.1'.

On both sides of the pole cores 1, l', centrifugal cooling fans 7.7' having a diameter smaller than the inner diameter of the stator are installed concentrically with the shaft, and the blades of the fans 7.7' are mounted on both sides of the pole cores 1, l'. -a and 7-a' are directed in the opposite direction to the pole core, and are closely attached and fixed to the pole core by appropriate means.

Further, the fan 7.7' is a mixed flow type in which the blades 1-a and 7-a' are tilted forward in the direction of rotation in order to force cooling air into the pole core 1.1' so as to cool the rotor coil 5. It becomes.

On both sides of the pair of end frames 9.9', there is a shroud which functions as a guide plate for the fan and faces the blades 7-a, 7-a' of the fan 7.7' with an appropriate gap. (Cover) 9-a and 9-a' are formed.

Also, the bearings 1 on both sides of both end frames 9 and 9'
In the vicinity of 1.11', there are suction windows 9-b, 9-b' so that cooling air is sucked into the frame by fans 7.7'.
A discharge window 9-c for discharging the hot air after cooling is formed in a portion located on the outer periphery of the stator coil 2-b. Although only 9-c is shown in FIG. 1, there is also a discharge window on the end frame 9' side.

Boo IJ placed on the outside of the end frame 9.9'
1.2 is connected to the shaft 4 by a nut 13 via a bearing 11. Furthermore, the shaft 4 is connected to the engine (not shown) via the boot IJ12.
It is rotated by

A diode (not shown) is installed on the outside opposite to the pulley side of the outer frame formed by the end frame 9.9'.
The electrical functional components including the diode fin 14 with a diode fin 14, the brush holder 15 that holds the brush 15-a that supplies excitation current to the rotor coil 5, and the IC regulator (not shown) that adjusts the output voltage are mounted on the rear cover. 16 and is fixed to the frame 9'.

The rear cover 16 is formed so as to surround the diode fin 14, the brush holder 15, and the regulator, and regulator cooling holes and diode cooling holes are appropriately opened in the side surface.

FIGS. 1 to 3 show the structures of a bobbin 20 and a spacer 30, which are each made of insulating resin.

Flange portions 20-a are formed at both ends of the bobbin 20, and 1
A connection part 21 having a narrow width is integrally formed from the tail part 20-a at a position facing the end of the claw 1-p of the pole core 1, and is connected to the spacer 30 via a hinge part 22. ing. The spacer 30 has a recess 30-a that contacts the side surface 1-a and back surface ib of the claw 1-p of the pole core 1, and an outer circumference of the claw 1-p on both sides of the recess 30-a. A curved surface portion 30-b along this curved surface portion 3o
- L-shaped storage part 30 bent inward from the end of b
It consists of c. And the claw t-p of pole core 1
The same number of spacers 30 are connected to the bobbin 2 by the connecting part 21.
0 is integrally formed.

Next, assembling will be described. As shown in FIG. 4, the excitation coil 5 is wound around the outer periphery of the bobbin 20. Thereafter, as shown in FIG. 5, the spacer 30 is bent inward at the hinge portion 22 and inserted into the pole core 1. Then, the claw 1-p of the pole core 1 is fitted into the recess 30-a of the spacer 30. At this time, as shown in Figure 7,
Storage portions 30-C of adjacent spacers 30 face each other,
A recess 30-d into which the claw 1-p' of the pole core 1' fits is formed in a pair of adjacent storage parts 30-c.

Next, as shown in FIGS. 6 and 8, the claw 1-p' of the pole core 1' is fitted into the recess 30-d formed by the pair of adjacent storage parts 30-c. The bobbin 20 is then fixed between the pole cores 1.1'. A spacer 3° curved surface portion 30-b is arranged in the gap between the claws 1-p, 1-p' of the pole core 1.1', and the pole cores l, 1.
The outer peripheries of the claws 1-p and 1-p' and the curved surface portion 30-b of the spacer 3o have a cylindrical shape with no unevenness. Further, the length in the axial direction of the curved surface portion 30-b of the spacer 30 is the same as that of the pole core 1.
．． 1', at least stator teeth 2
- claw of pole core 1.1' in the part opposite to a' x-p
, 1-p' to the extent that the unevenness on the outer periphery disappears. moreover,
As can be seen from FIGS. 5 and 6, a space is formed between the spacer 30 and the excitation coil 5.

Next, the operation of the above vehicle alternator will be explained. Current is supplied to the rotor coil 5 via the brush 15-a and the slip ring, and the rotor coil 5 is rotated via the pulley 12, whereby an alternating current is induced in the stator coil 2-b and rectified by the rectifier. Since the power generation system in which the output voltage is controlled by a regulator is well known, a detailed explanation will be omitted, and the operation unique to the present invention will be explained.

When the shaft 5 rotates, the cooling fans on both sides of the pole core 1.1' -a and 7-a' rotate, and the suction window 9-b
, 9-b', cools the bearings 11, 11', cools the stator coil 2-b, and is discharged as hot air to the outside through the discharge window 9-c. Also, a part of the cold air is pushed toward the pole core 1.1', receives heat from the rotor coil 5, cools the stator coil 2-b, and is discharged as hot air from the discharge window 9-c. Ru.

When the above-mentioned cold air passes through the pole core 1.1', as the speed has increased in recent years, centrifugal wind This caused pulsating pressure fluctuations between the stator 2 and the pole core 1.1', and interference noise was generated due to the unevenness formed by the stator teeth 2-a' and the slots. Pole core claw side 1-
Since the curved surface part 30-b of the spacer 30 is installed in the space between the pole core claws 1-pS1-p', the outer periphery of the pole core claw 1-pS1-p' has a cylindrical shape with no unevenness, so that the pole core side surface 1-a No centrifugal air is generated due to the fan effect, and no interference noise is generated between this centrifugal air and the unevenness of the stator teeth 2-a'.

Further, in the spacer 30, the concave portion 30-a is located at the pole core 1.
Since it is in contact with the back surface 1-b of the claw t-p, it is prevented from scattering due to centrifugal force.

Also, the blades of fan 7 when the rotor rotates? -by a,
Regarding the cooling air flowing between the claws 1-p and 1-p1 of the pole core 1.1', there is a gap between the spacer 3o and the excitation coil 5, so the ventilation can be carried out in the axial direction as before, and the excitation Cooling of the coil 5 is possible.

Further, the recesses 30-a and 30-d of the spacer 30 are connected to the side surfaces 1-a and 1-a' and the back surfaces l-s and i-b' of the claws t=p and 1-p' of the pole core 111', respectively. Since the bobbin 20 is in contact with the pole core 1.1' and the bobbin 20 is integrally formed with the connecting portion 21, the relative rotation between the bobbin 20 and the pole core 1.1' is prevented by moving the bobbin 20 together with the pole core 1.1'. Due to the excitation coil wound around the bobbin 20 without any movement, the pawl l-p of the pole core 1.1'.

1-p', the force of the spacer 30 expanding toward the outer periphery presses the claws 1-p, 1-p' toward the outer periphery, causing the claws 1-"p, , '1- By suppressing the radial vibration of p', the pawls 1-p, 1 of the pole core 111'
-p' resonance sound can also be reduced.

In addition, as another embodiment, as shown in FIGS. 11 and 12, the spacers 30 may be formed integrally with the pair of tail portions 20a of the bobbin 20 alternately using the connecting portions 21.

〔Effect of the invention〕

As described above, in the present invention, at least the outer periphery of the rotor facing the teeth of the stator is provided in the space formed between the claws of the pole core by the spacer formed integrally with the bobbin around which the excitation coil is wound. Since it has a cylindrical shape with no unevenness, centrifugal wind is not generated due to the fan effect on the side of the claw of the pole core, and interference noise between this centrifugal wind and the unevenness of the teeth is prevented. It has an excellent effect of preventing relative rotation of the bobbin and preventing disconnection and short circuit of the excitation coil.

[Brief explanation of drawings]

1st. The figure is a schematic diagram of a bobbin and a spacer used in an embodiment of the rotor of an alternator for a vehicle according to the present invention, FIG. 2 is a perspective view of the spacer in FIG. 1, and FIG. -■Cross-sectional view! Figure 4 is a cross-sectional view showing the state in which the excitation coil is wound around the bobbin, Figure 5 is a cross-sectional view showing the state in which one pole core is attached to the bobbin, and Figure 6 is a cross-sectional view showing the state in which a pair of pole cores are attached to the bobbin. Figure 7 is a perspective view showing a state in which one pole core is attached to the bobbin, Figure 8 is a perspective view showing a state in which a pair of pole cores are attached to the bobbin, and Figure 9 is a main part of a vehicle alternator. Cross-sectional view, Figure 10 is the 9th
The front view as viewed from arrow P in the figure, and FIGS. 11 and 12 are a schematic diagram and a sectional view of a bobbin and a spacer used in another embodiment of the rotor of the vehicle alternator of the present invention. 1.1'...Pole core, 1-p, 1-p'...Claw. 2... Stator 2-a/... Teeth, 5... Excitation coil, 20... Bobbin, 21... Connecting portion, 22
...Hinge part, 30...Spacer, 3O-a-recessed part, 30-b...Curved surface part, 30-c...Storage part, 30
-d...concavity.

Claims (1)

[Claims] A pair of Lundell-type pole cores each having a plurality of claws are arranged so as to mesh with each other alternately, and a rotor having an excitation coil wound inside the pole core, and a rotor arranged in a radial direction around the rotor. A vehicular alternator comprising a stator having teeth arranged to face each other, a bobbin around which the excitation coil is wound, and a space formed integrally with the bobbin and formed between the claws, at least A rotor for an alternator for a vehicle, comprising: a spacer made of a non-magnetic material such that an outer peripheral portion of the rotor facing the teeth has a cylindrical shape without unevenness;