KR20220117051A - Stator heat radiating structure of vehicle alternator - Google Patents

Abstract

The present invention relates to a stator radiation structure of a vehicle AC generator and, more specifically, to a stator radiation structure of a vehicle AC generator, capable of increasing the area of contact with outside air through a shape change for an outer circumference surface of a stator core, always coming in contact with outside air, to increase the radiation performance of a stator, thereby improving the output performance of an AC generator. In accordance with the present invention, the stator radiation structure of a vehicle AC generator includes a stator core having a slot formed on an inner circumference, and an angular copper wire inserted into the slot, wherein a plurality of protruding parts having a structure protruding in a diameter direction are formed in an outer circumference surface part of the stator core coming in contact with outside air.

Description

Stator heat radiating structure of vehicle alternator

The present invention relates to a stator heat dissipation structure of an alternator for a vehicle, and more particularly, by changing the shape of the outer circumferential part of the stator core in contact with the outside air, the contact area with the outside air can be increased to increase the heat dissipation performance of the stator, , It relates to a stator heat dissipation structure of an alternator for a vehicle that can improve the output performance of the alternator through this.

In general, various electric and electronic devices operated by electric power supplied from a generator and a battery are mounted on a vehicle, and a charging device centered on the generator is provided for stable supply of electric power to be supplied to them.

A DC generator and an AC generator are used as the generator, but in recent years, an AC generator that maintains stability even at low speed and high speed is more widely used.

In order to increase the generated voltage at low speed and to exhibit stable performance at high speed, a three-phase or six-phase alternator called an 'alternator' is commonly used in the vehicle alternator. The phase alternator is connected to the crankshaft of the vehicle engine and receives power when the engine rotates to generate power and charge the battery.

A vehicle alternator includes a stator having a stator winding and a rotor having a rotor winding. The rotor has rotor poles disposed opposite to each other and rotor windings installed inside the opposing pole pieces. And, the magnetic pole pieces have a structure in which the magnetic pole parts protrude in the axial direction, and the magnetic pole parts formed on the opposite pole pieces are alternately arranged along the circumferential direction,

Here, the stator core provided in the stator has a structure in which thin plates are laminated in multiple layers to form a bonded structure, and a plurality of slots are arranged in the circumferential direction on the inner periphery of the stator core, and angular copper wire forming a conductor material inside the slot (or coil) is inserted.

On the other hand, the output performance of the alternator is greatly affected by the internal temperature. When the internal temperature is high, the output performance is lowered, and as the internal temperature is low, the output performance is rapidly increased. In such an alternator, since the stator portion provided with a angular copper wire made of a conductor material through which current flows acts as a main heat source, the output performance of the alternator may be greatly reduced by the high-temperature heat generated in the stator portion. For this reason, the alternator has a cooling fan installed at the end of the rotor to cool the heat generated in the stator portion through the cooling air flow formed inside the alternator by the cooling fan rotating in conjunction with the rotor.

However, the conventional air-cooled stator heat dissipation structure for dissipating the heat of the stator using the cooling air flow formed by the cooling fan as described above has a limitation in effectively dissipating the high-temperature heat generated in the stator portion, and in order to increase the cooling efficiency, When a large size cooling fan is installed, there is a disadvantage in that noise is generated due to the cooling fan driving. In addition, some conventional alternators have adopted a water-cooled stator heat dissipation structure in which heat generated from the stator part is cooled using cooling water supplied from the outside. There was a disadvantage in that it became complicated and the manufacturing cost of the alternator was increased. Therefore, there is an urgent need to find a new way to increase the output performance of the alternator by effectively cooling the high-temperature heat generated in the stator portion where each copper wire is installed.

Republic of Korea Patent Registration No. 10-0473101 (2005.02.15)

The present invention has been devised to solve the above problems, and the technical problem to be solved in the present invention is to form a plurality of protrusions having a shape protruding in the radial direction on the outer peripheral surface of the stator core in contact with external air to form an external By increasing the surface area of the stator core in contact with air, the heat generated from the stator part can be effectively dissipated to the outside, thereby increasing the cooling efficiency, thereby greatly improving the output performance of the alternator for vehicles. is to provide

A stator heat dissipation structure of an alternator for a vehicle according to the present invention for solving the above technical problem is a stator structure of an alternator for a vehicle having a stator core having a slot formed on the inner periphery, and a angular copper wire inserted into the slot, the external A plurality of protrusions having a structure protruding in a radial direction are formed on an outer circumferential portion of the stator core in contact with air.

Here, the plurality of protrusions may be arranged at regular intervals in the axial direction of the stator core to form a rectangular concave-convex structure when viewed from a direction perpendicular to the axis of the stator core.

In this case, the stator core includes a plurality of first iron core portions having a first radius and a plurality of second iron core portions having a second radius greater than the first radius, and the second iron core portion is the first iron core portion. It may be joined in a state interposed therebetween to form the plurality of protrusion structures.

According to the above-described stator heat dissipation structure of the present invention, a plurality of protrusions protruding in the radial direction are formed on the outer peripheral surface of the stator core that is in direct contact with the outside air in a state of being mounted on the alternator to increase the contact area with the outside air. By greatly increasing the heat generated from the stator part where each copper wire is installed, the cooling effect can be increased by efficiently dissipating the heat generated from the stator part where each copper wire is installed, and through this, the output performance of the AC generator can be greatly improved.

1 is a cross-sectional view showing an alternator according to the present invention.
Fig. 2 is a side view of a stator assembly according to the present invention;
3 is a perspective view showing a stator core according to the present invention;
Fig. 4 is a front view of the stator core shown in Fig. 3 in its axial direction;
Fig. 5 is a side view of the stator core shown in Fig. 3 viewed in a direction perpendicular to its axial direction;

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention.

However, the present invention may be implemented in several different forms and is not limited to the embodiments described herein. In addition, it should be noted that parts denoted by the same reference numerals throughout the detailed description mean the same components.

Hereinafter, one embodiment of a stator heat dissipation structure of an alternator for a vehicle of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a configuration of an alternator for a vehicle according to the present invention, and FIG. 2 is a side view showing a side structure of a stator assembly provided in the alternator of the present invention.

1 and 2, the vehicle alternator 100 of the present invention is rotatably disposed in the center of the housing 110 to generate magnetomotive force (Rotor Assembly; 120) and, A brush assembly 130 for supplying current to the rotor assembly 120 and the rotor assembly 120 are disposed along the inner circumference of the housing 110 to surround the rotor assembly 120 from the rotor assembly 120 . It is configured to include a stator assembly 140 that generates an induced electromotive force by the generated magnetomotive force, and a pulley 150 connected to the crankshaft of the engine through a belt to receive power from the engine.

The rotor assembly 120 is rotatably supported through bearings 162 and 164 installed at the front and rear of the housing 110 by coupling the rotor shaft 122 located at the center thereof to the center of the pulley 150 .

The stator assembly 140 includes a stator core 142 formed by stacking a plurality of thin steel plates having a predetermined thickness, and a plurality of angular copper wires ( Bar Wire; 146).

The slots 144 into which the copper wires 146 are inserted are arranged along the circumferential direction on the inner periphery of the stator core 142, and in the inner space of each slot 144, the copper wires 146 are inserted in two or more rows. is fixed

And, the alternator 100 while rotating in conjunction with the rotor shaft 122 in order to cool the high-temperature heat generated in the stator core 142 in which the angular copper wire 146 is installed at the end of the rotor shaft 122 . ) A cooling fan 160 that forms a cooling air flow therein is installed.

The cooling fan 160 is rotated in conjunction with the rotor shaft 122 rotated by receiving the driving force of the engine to form a cooling air flow in the axial direction inside the alternator 100 to blow cool outside air into the alternator 100 . ) The AC generator 100 is cooled by cooling the angular copper wire 146 and the stator core 142 part that radiates high heat after being drawn inside and discharging to the outside.

On the other hand, the high-temperature heat generated in the angular copper wire 146 and the stator core 142 portion through the cooling air flow formed by the cooling fan 160 during the operation of the alternator 100 can be cooled to some extent. However, since there is a certain limit in its cooling performance, a means for additionally cooling the heat generated in the angular copper wire 146 and the stator core 142 along with the cooling action by the cooling fan 160 is required. .

Accordingly, in the present invention, the shape of the stator core 142 directly in contact with the outside air is changed separately from the cooling action of the angular copper wire 146 and the stator core 142 using the cooling fan 160. The stator core 142 structure is provided so that an additional cooling action can be realized by increasing the contact area with air.

3 is a perspective view showing a stator core 142 according to an embodiment of the present invention, and FIGS. 4 and 5 are a front view of the stator core 142 shown in FIG. 3 in an axial direction and a direction perpendicular to the axis, and Each side view is shown.

3 to 5 , the stator core 142 according to the embodiment of the present invention has a thin steel plate-type iron core formed with a plurality of slots 144 for inserting the angular copper wire 146 on the inner periphery in multiple layers. Lamination is formed, and has a structure in which a plurality of protrusions P having a shape protruding by a predetermined width in the radial direction are arranged at regular intervals on the outer peripheral surface of the stator core 142 that is always in contact with external air.

Specifically, the stator core 142 of the present invention has a first radius R1 and a plurality of first iron core portions 142a joined to each other, and a second radius R2 greater than the first radius R1. and a plurality of second iron core portions 142b bonded to each other.

Here, the plurality of first iron core portions 142a and second iron core portions 142b have the same thickness, while their respective radius (or diameter) sizes are formed to be different from each other. That is, the radius (second radius) of the second iron core portion 142b is larger than the radius (first radius) of the first iron core portion 142a by a predetermined width.

In this case, a plurality of the first iron core portions 142a having the same first radius R1 may be stacked and joined together, and the second iron core portions 142b having the same second radius R2 also A plurality of them may be stacked and bonded to each other.

In this case, the second iron core portions 142b having a larger radius R2 than the first iron core portions 142a may overlap each other in a specific number to form one group of second iron core portions 142b, The iron core portions 142a may also be overlapped with each other in a specific number to form one group of the first iron core portions 142a.

Here, the plurality of groups of the second iron core parts 142b overlapped in a specific number are bonded to each other while being interposed between the groups of the plurality of first iron core parts 142a overlapped in a specific number, so that as shown in FIG. 5 , the stator core The outer peripheral surface of 142 may form a rectangular concave-convex structure in which a plurality of protrusions P are formed.

In this embodiment, three first iron core portions 142a overlap to form one first iron core portion 142a group, and three second iron core portions 142b overlap to form one second iron core portion 142b group. An example is shown, in which three groups of second iron cores 142b are interposed between the groups of four first iron cores 142a, and are joined to each other in a state where they are interposed, so that the outer peripheral surface of the stator core 142 has 3 Four protrusions P structures may be formed.

Here, the structure of the protrusion P is not formed in the form of a separate structure on the outer surface of the stator core 142 , but is formed of the first iron core portion 142a and the second iron core portion 142b constituting the stator core 142 . Since the outer periphery of the second iron core 142b protrudes from the outer periphery of the first iron core 142a by a predetermined width P through bonding with different radius (or diameter) sizes, the protrusion is shown in the drawing. Reference numerals for (P) and the protrusion width are the same. In this case, the protrusion width of the protrusion P is preferably formed to have a protrusion width within a range that does not interfere with the flow of magnetic flux flowing in the stator core 142 .

The stator core 142 of the present invention assembled as described above is perpendicular to the central axis of the stator core 142 as shown in FIG. The shape of the outer circumferential surface (side shape) of the stator core 142 viewed from the direction has a rectangular concave-convex structure, and therefore, in the state in which the stator core 142 is mounted in the alternator 100 , the stator is always in contact with external air. As the surface area of the outer peripheral surface of the core 142 is greatly increased, the high-temperature heat generated from the angular copper wire 146, which is the main heat source of the stator, can be easily discharged to the outside through the outer peripheral surface of the stator core 142 with the increased surface area, thereby dissipating heat. It can improve performance and increase cooling efficiency.

According to the stator heat dissipation structure of the present invention as described above, a plurality of protrusions (P) in the form of protruding in the radial direction from the outer peripheral surface of the stator core 142 that are always in contact with the outside air in the state mounted on the alternator 100 ) to increase the surface area of the stator core 142 in contact with the outside air, so that the high-temperature heat generated in the stator core 142 to which the angular copper wire 146 is fixed can be effectively discharged to the outside and cooled. When the above-described stator heat dissipation structure of the present invention is applied together with air cooling by the cooling fan 160, the output performance of the alternator 100 can be greatly improved.

Although preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to these specific embodiments, and those skilled in the art will appropriately change within the scope described in the claims of the present invention. this will be possible

100: alternator 110: housing
120: rotor assembly 122: rotor shaft
130: brush assembly 140: stator assembly
142: stator core 142a: first iron core
142b: second iron core 144: slot
146: copper wire 150: pulley
160: cooling fan 162,164: bearing

Claims (3)

In the stator structure of a vehicle alternator having a stator core having a slot formed on the inner periphery, and a angular copper wire inserted into the slot,
A stator heat dissipation structure for a vehicle alternator, characterized in that a plurality of protrusions having a structure protruding in a radial direction are formed on an outer peripheral surface portion of the stator core in contact with external air.
According to claim 1, wherein the plurality of protrusions are arranged at regular intervals in the axial direction of the stator core, characterized in that the shape viewed in a direction perpendicular to the axis of the stator core to form a rectangular concave-convex structure. Stator heat dissipation structure of automotive alternator.
The method of claim 1 , wherein the stator core comprises:
a plurality of first iron cores having a first radius;
Includes; a plurality of second iron cores having a second radius greater than the first radius;
The stator heat dissipation structure of an alternator for a vehicle, characterized in that the second iron core is joined with the first iron core interposed therebetween to form the plurality of protrusion structures.

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