JPH01107640A - Rotor for vehicle ac generator - Google Patents

Abstract

PURPOSE:To enhance a permeability of varnish to improve a cooling efficiency and to prevent an insulation failure by providing intermediate collar parts having grooves between both ends of the cylindrical part of a bobbin and by part-winding a coil on both sides of said intermediate collar parts. CONSTITUTION:In a rotor, where a bobbin 3 is fitted between a pair of rotor cores 5 and at the outer periphery of a field core 2 and a field coil 4 is wound around said bobbin 3, intermediate collar parts 13, 14 are provided between both ends of the cylindrical part 10 of said bobbin 3. Grooves 19 are formed in said intermediate collar parts 13, 14. Further, field coils 20-22 are divided on both sides of said intermediate collar parts 13, 14 for part-winding. In this manner, not only cooling efficiency but also insulating properties are improved at the time of impregnating a field coil with varnish, because said varnish sufficiently permeates the innermost part of said coils 20-22 via grooves 19. Thus, it is possible to contrive to raise the output of an apparatus.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotor of an AC 5F for a vehicle and an electric machine, and particularly to a rotation of an AC generator tll for a vehicle, which is suitable for miniaturizing and increasing the output of a vehicle alternator. Concerning children.

[Conventional technology]

The rotor of a conventional vehicle alternator was developed in 1988.
As described in No. 449, a field core is inserted between a pair of rotor cores that rotate together with the rotating shaft, a resin bobbin is attached to the outer periphery of this field core, and a coil is wound around this bobbin. It is equipped with a field coil. This field coil was treated with varnish by dropping varnish from its outer peripheral surface. This is to prevent problems such as poor insulation of the coil and disconnection of the coil, since the rotor of the vehicle alternator is used under high rotation and high vibration conditions.

On the other hand, in recent years, the electronic control of equipment such as engine control devices and the electrification of equipment such as electric power steering have become increasingly popular, leading to an increase in power consumption and the need for vehicular ACs installed in limited space. There is a strong desire for smaller generators with higher output.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional rotor, no consideration was taken to sufficiently fill the inside of the field coil with varnish between both ends of the cylindrical portion of the resin bobbin. The varnish penetrated into the interior of only about three stages, and it was not possible to fill all the coil winding stages with the varnish. For this reason, there remains a part inside the coil that is not filled with varnish, and the heat generated by the field coil is trapped in this part, resulting in poor heat dissipation, increasing the temperature of the coil, and secondly, increasing the electrical resistance of the coil. There was a problem in that the power generation output increased and the power generation output decreased, making it impossible to ensure high power generation performance and not being able to sufficiently respond to the miniaturization and high output of vehicular alternating current generators.

Also, the fact that the inside of the field coil is not filled with varnish naturally means that the coil moves due to high rotation and high vibration in this part, making it impossible to sufficiently prevent problems such as poor insulation, short circuits, burnout, and disconnection of the coil, making it unreliable. There was a problem of not being able to secure sex.

Therefore, an object of the present invention is to provide an alternator for a vehicle that can be made smaller in size and have a higher output, and that can reliably prevent problems such as poor insulation of the coil, short circuit, burnout, and wire breakage. The objective is to provide a rotor for this purpose.

[Means for solving problems]

The above-mentioned object is to provide an alternator for a vehicle, characterized in that at least one intermediate collar portion having a break is provided between both ends of a cylindrical portion of a bobbin, and a coil is wound in segments on both sides of the intermediate collar portion. This is accomplished by a rotor.

[Effect]

The gap in the intermediate flange portion provides a gap extending from the outer circumferential surface to the inside at the end face of the split-wound coil.

When varnish is applied from the outer surface of this slicked field coil, the varnish penetrates into the inside of the coil through this gap.
Filled inside the coil. Thereby, the heat generated by the field coil is transmitted through the varnish without being trapped inside and is radiated to the outer peripheral surface of the coil or the rotating shaft, improving cooling efficiency. Therefore, the temperature rise after operation can be kept to a minimum, and a decrease in power generation output can be suppressed. In addition, since the varnish is filled to the inside, it is possible to firmly fix the bobbin and the coil and between the coil windings, and it is possible to reliably prevent defects such as poor insulation, short circuits, burnout, and disconnection of the field coil. , reliability is improved.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 shows the entire rotor of a vehicular alternator according to the present invention, in which a field core 2 is mounted on a rotating shaft 1.

A nylon bobbin 3 is fitted around the outer periphery of the field core 2, and the nylon bobbin 3 is provided with a field coil 4 having a coil wound thereon. The nylon bobbin 3 equipped with the field core 2 and the field coil 4 has a plurality of claws on both end surfaces.
The rotor core 5 is sandwiched between a pair of rotor cores 5 having a rotor core 5, and is fixedly held on the rotating shaft 1. Further, a slip ring 6 is inserted into the rotating shaft 1 and fixed thereto.

A cooling fan 7 is attached to the back of the rotor core 5. The sunrise wire 8 of the field coil 4 is electrically connected to the lead wire 9 of the slip ring 6.

The details of the structure of the nylon bobbin 3 and the field coil 4 are described in Part 2.
As shown in FIGS. Nylon bobbin 3 is
A cylindrical portion 10 around which a coil is wound, end flange portions 11 and 12 provided at both ends of the cylindrical portion 10, and at least one, in this embodiment, two intermediate portions provided between both ends of the cylindrical portion 10. It consists of a collar portion of 13° and 14°.

As shown in FIGS. 2 and 3, the end flange 11 has
A large number of holes 15 are formed on the side surface, and on the side surface where the field coil 4 is located, one end is open to the outer peripheral end of the collar, and the other end reaches near the cylindrical portion 10 at the inner peripheral end of the collar. A large number of grooves 16 are formed. Further, a plurality of half-moon-shaped protrusions 17 are formed on the outer peripheral end of the brim to be held between the claws of the rotor core 5 and to fix the position of the nylon bobbin 3.

A groove 16 and a half-moon-shaped protrusion 17 are formed in the other end flange 12, and two opposing half-row protrusions 1
A winding protrusion 18 is formed on the coil 7 for winding and fixing the winding start and winding end portions of the coil.

As shown in FIG. 4, the intermediate brim portion 13.14 has a number of notches 19, one end of which is open at the outer peripheral end of the brim, and the other end of which reaches near the cylindrical portion 10 at the inner peripheral end of the brim. It is formed.

The field coil 4 is assembled by dividing the winding into three coils 20, 21, and 22 on both sides of the intermediate collar 13, 14.

Since the rotor of this embodiment is configured as described above,
The three coils 20 of the field coil 4 are placed between the end collar portion 11.12 and the intermediate collar portion 13.14 of the nylon bobbin 3.
With coils 21 and 22 wound in sections, coils 20.
A gap extending from the outer peripheral surface to the vicinity of the cylindrical portion 10 is formed on both end surfaces of the tube 21.22 by the groove 16 of the end flange 11.12 and the notch 19 of the intermediate flange. Therefore, when varnish is applied from the outer peripheral surface of the field coil 4, the varnish is sufficiently filled to the inside of the field coil.

That is, looking at the coil 20, the varnish enters along both end surfaces of the coil 20 due to the gap formed by the concave groove 16 of the end face flange 11 and the notch groove 19 of the intermediate flange 13, and the varnish penetrates in the radial direction. The varnish reaches the cylindrical portion 10 and penetrates from both sides in the axial direction to the center or near the center, filling most of the coil 20 with the varnish. coil 2
The same applies to 1.22. In this way, the presence of the groove 16 in the end flange 11.12 and the intermediate flange 13.1
4 and its notch groove 19, especially the intermediate collar part 13.1
4 and its notch edge 19, the varnish is filled up to the inside of the field coil 4.

By filling the inside of the field coil 4 with varnish in this way, it is possible to firmly fix the nylon bobbin 3 and the field coil 4 and between each coil winding of the field coil 4. This prevents the movement of the field coil 4 due to the high rotation and high vibration of the rotor, and it is possible to reliably prevent problems such as poor insulation, short circuits, burnout, and disconnection of the field coil 4, thereby reducing the risk of occurrence. The reliability of one machine can be improved.

Also, by filling the inside of the field coil 4 with varnish, the heat generated in the field coil during operation is
Heat is radiated to the outer circumferential surface of the coil or the rotating shaft 1 through the varnish without being trapped inside, improving cooling efficiency. Therefore, the rise in temperature of the coil after operation can be kept to a minimum, and the reduction in power generation output due to the rise in temperature can be suppressed.

To explain this with reference to Fig. 7, the performance of an alternator is generally determined by the cold-time characteristic, which shows the relationship between the rotation speed and the output current in a state where there is no temperature rise immediately after rotation; It is evaluated based on the hot characteristic, which shows the relationship between the rotation speed and the output current after the temperature rises. For example, in the case of a 70A AC generator, the hot characteristic is 31 compared to the cold characteristic of 30.
However, according to this example, as shown by the broken line 32, the degree of decline in the temperature characteristics was reduced. As a result, for example, at a rotation speed of 5000 RPM, an output increase of about 3 A could be achieved.

Therefore, the alternator of this embodiment can obtain high output even though it is the same size as the conventional product, and the alternator can be made smaller and have higher output.

In the above embodiments, the grooves 16 on the end flange portions 11 and 12 were made into concave grooves, and the grooves 19 on the intermediate flange portions 13 and 14 were made into notched grooves, but these shapes are not limited to these.
For example, the groove of the intermediate flange 13.14 is connected to the end flange 11.1.
It may be formed in a concave groove as in the case of No. 2.

〔Effect of the invention〕

As is clear from the above, according to the rotor of the vehicular AC generator N R of the present invention, at least one intermediate collar portion having a groove is provided between both ends of the cylindrical portion of the bobbin, and both sides of the intermediate collar portion are provided with at least one intermediate collar portion having a groove. Since the coil is wound in parts, it is possible to make the AC generator for vehicles smaller and higher in output, and it also reliably prevents problems such as poor insulation, short circuits, burnout, and disconnection of the coil, making it possible to improve the quality of the generator. Reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the entire rotor of a vehicle alternator according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the bobbin and field coil portions of the rotor. Fig. 3 is a view of the bobbin and field coil shown in Fig. 2 as seen from the direction of the arrow ■, Fig. 4 is a sectional view taken along the line IV-IV in Fig. 2, and Fig. 5 is a view of the bobbin and field coil shown in Fig. 2 is a sectional view taken along line v-v in FIG. 2, FIG. 6 is a view of the bobbin and field coil portion shown in FIG. FIG. 2 is a diagram showing the output performance of the vehicle alternator in comparison with a conventional product. Explanation of symbols 1...Rotating shaft 2...Field core 3...
Bobbin 4... Field coil 5... Rotor core 10... Cylindrical portion 13.14... Intermediate collar portion 19... Notch erasure (groove) 20.21.22... Split coil applicant Hitachi, Ltd. Figure 1 Figure 2 Mu Kawara - Jin 3E Figure 4 q Figure 5 Figure 6

Claims (3)

[Claims] (1) A vehicular alternator equipped with a field coil in which a bobbin is attached to the outer periphery of a field core between a pair of rotor cores that rotate together with the rotating shaft, and a coil is wound around this bobbin. An alternating current generator for a vehicle, characterized in that the rotor has at least one intermediate collar portion having a groove between both ends of the cylindrical portion of the bobbin, and a coil is wound in segments on both sides of the intermediate collar portion. rotor. (2) A rotor for a vehicle alternator according to claim 1, wherein the groove is a notched groove. (3) A rotor for a vehicle alternator according to claim 1, wherein the groove is a concave groove.