JP2003088014A - Rotating electric machine and armature therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armature for rotating electric machine with enhanced cooling capability without forced increase in cooling air quantity, and a rotating electric machine. SOLUTION: In the armature 20 for rotating electric machine, wires 22 are wound on an armature core 21. The armature core 21 is provided with teeth 21a on which wires are wound. The teeth 21a are provided with heat radiating faces which penetrate the teeth in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature for a rotating electric machine and a rotating electric machine, and more particularly to an armature for a rotating electric machine and a rotating electric machine that are lightweight and have high cooling performance.

[0002]

2. Description of the Related Art Generally, in rotating electric machines such as blower motors, which are required to have high output, the cooling technology of electric motors, which is how to improve the heat radiation efficiency in order to secure the life of the brush commutator and increase the efficiency, is a major issue. Has become.

In the conventional cooling technology, for example, a forced cooling method is adopted for cooling, but there is a limit to cooling the air in the limited space, but there is a limit. There is a limit to the high efficiency of A known technique for dissipating heat from an armature is to provide a propeller in the vicinity of the armature or directly on the armature, and cool the propeller by rotating the propeller. Further, the outer peripheral portion of the armature is provided with a recess parallel to the axial direction of the rotating electric machine,
It is also known that the surrounding air is agitated by the depressions as the armature rotates, and a certain degree of fan action is produced.

The technique of providing a propeller in the vicinity of the armature for cooling requires a separate propeller, which not only increases the size of the rotating electric machine but also raises the manufacturing cost. The technology of agitating the surrounding air by providing a recess in the outer peripheral part of the armature parallel to the axial direction of the rotating electric machine does not require a separate propeller, but the fan action is weak and the air is sufficiently sent. The cooling effect is insufficient because the flow cannot be performed and the air cannot be circulated constantly. Therefore, there is also known a technique in which a plurality of axial cooling through holes are formed in the core (for example, Japanese Patent Laid-Open No. 10-2435).
88 publication).

[0005]

However, in this technique, since the cooling through hole is formed near the rotating shaft,
There is an inconvenience that the place where the winding is wound is not cooled. The present invention aims at obtaining an armature and a rotating electric machine with high cooling efficiency, paying attention to that most of the heat generation in the armature occurs in the copper wire. That is, an object of the present invention is to obtain an armature for a rotating electric machine and a rotating electric machine having improved cooling performance without forcibly increasing the cooling air volume.

[0006]

According to an armature for a rotating electric machine according to the present invention, the above-mentioned problem is an armature for a rotating electric machine in which a winding is wound around an armature core. The core is formed with teeth around which windings are wound, and the teeth are formed with a heat dissipation surface that penetrates the inside in the axial direction.
Will be solved by.

According to another aspect of the present invention, there is provided a rotating electric machine including a stator and an armature having a core arranged inside the stator. The core is formed with teeth around which windings are wound, and the heat dissipation surface is formed in the teeth so as to penetrate the inside in the axial direction.

Most of the heat generated by the armature for a rotating electric machine and the rotating electric machine is generated by the copper wire, and as in the present invention, the heat radiating surface penetrating axially inside the tooth portion around which the winding is wound. Since the core is formed, the core in contact with the copper wire directly acts as a radiator, and it is possible to increase the surface area of the tooth portion and improve the cooling performance.

The core is preferably formed by laminating a plurality of core sheets. When the core sheets are laminated in this manner, when forming the radiating surface that penetrates, it is only necessary to form slit holes (holes) in the teeth when manufacturing the core sheet. (Hole) can be formed, and the armature core can be easily manufactured.

Further, it is preferable that an end portion of the radiating surface that penetrates is formed with an opening so that the opening is not closed when the winding is wound. With this configuration, the heat radiation surface (hole) penetrating by the winding is not blocked, and it is possible to secure the circulation of air on the heat radiation surface in the tooth to assist heat radiation.

Furthermore, the present invention is suitable when the armature is provided with an insulating coating of powder. That is, if there is no heat radiating surface (through hole), the powder retains heat and accumulates heat, resulting in a significant decrease in output. However, since the powder does not go around the heat radiation surface (through hole) and the metal surface is exposed, the heat radiation effect is great.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

1 to 5 show an embodiment of the present invention. FIG. 1 is a plan view of a laminating steel plate, and FIG. 2 is a laminating steel plate on the core end face side of an armature for a rotating electric machine. A plan view, FIG. 3 is a plan view of an armature core formed by using the laminating steel sheets of FIGS. 1 and 2, and FIG. 4 is an armature core formed by using the laminating steel sheets of FIGS. 1 and 2. FIG. 5 is a perspective view, and FIG. 5 is an explanatory sectional view of the rotating electric machine.

As shown in FIG. 5, the rotating electric machine S of this example is
1 shows a blower motor, which includes a housing 10 having a stator 11, an armature 20, a commutator 30, a brush device 40, and a bearing 50. Note that reference numeral 60
Is a flange.

The armature 20 of this example includes an armature core 21 and
The armature core 21 includes a winding wire 22 and a rotating shaft 23.
Is formed by laminating a large number of laminating steel plates X as shown in FIG. 1, and both end faces are formed by laminating laminating steel plates Y as shown in FIG. A rotary shaft 23 is inserted into the armature core 21, a tooth portion 21 a extending outward is formed in the armature core 21, and a plurality of slot portions 21 b are formed between the teeth 21. . A winding wire 22 is wound around the slot portion 21b, and an end portion of the winding wire 22 is connected to a connection end portion of a commutator 30 formed on the rotating shaft 23. The brush device 40 is configured to be in sliding contact with the commutator 30. The rotary shaft 23 that constitutes the armature 20 is supported by a bearing 50.

The armature core 21 of this example is formed by using two kinds of laminating steel plates X and Y as shown in FIGS. 1 and 2, and a large number of laminating plates except the end side are laminated. As shown in FIG. 1, the laminating steel plate X has a tooth portion 21a.
A core body 21c, an elongated slit hole 21d,
The core main body portion 21c includes a rotary shaft 2
A hole 21e for inserting 3 is formed, a plurality of tooth portions 21a are formed outside the core main body portion 21c, and a slot portion 21b is formed between the teeth by stacking the plurality of tooth portions 21. ing.

As described above, the tooth portion 21a of the present example.
An elongated slit hole 21d is formed in the. Since the elongated slit hole 21d is formed in the tooth portion 21a in this manner, when a plurality of layers are stacked, the elongated slit hole 21d forms the elongated through hole 24, thereby expanding the heat radiation area. .

Further, a laminating steel plate Y arranged on both end surfaces
As shown in FIG. 2, the elongated slit holes are different from those of the laminating steel sheet shown in FIG. The same components as those of the laminating steel plate X are designated by the same reference numerals, and the description thereof will be omitted. That is, the laminating steel plate Y of this example has the core main body 21
Since the elongated slit hole 21f is extended to c, the slit hole 21f communicating with the through hole 24 is formed when stacked, and the core body portion 21
The portion of the elongated slit hole 21f extending to c is the opening after winding.

Therefore, a large number of laminating steel plates X shown in FIG. 1 are laminated, and one or more laminating steel plates Y as shown in FIG. 2 are laminated on both end surface sides to form the armature core 21. To do. With this configuration, even if the winding wire 22 is wound around the slot portion 21b of the armature core 21, the opening portion of the slit hole 21f of the laminating steel plate Y disposed on the end face side is covered with the winding wire 22. As a matter of fact, it is possible to secure the opening portion and secure the circulation of the cooling air into the through hole 24 formed in the armature core 21.

The armature core 21 is coated with powder insulation. When the insulating coating with powder is performed in this manner, the heat generated by the powder coating is accumulated and the output is significantly reduced. However, as in this example, the heat dissipation surface (through hole 24) With the formation, the powder does not flow into the through hole 24 in the tooth portion 21a, and the metal surface of the slit hole 21d of the laminating steel plate X forming the armature core 21 is exposed in the through hole 24. Therefore, it is possible to make direct contact with the cooling air flowing through the through holes 24 to enhance the heat radiation effect.

(Modification 1) In the above-mentioned embodiment, an example using two kinds of laminating steel plates X and Y is shown, but it is also possible to constitute with only laminating steel plate Y as shown in FIG. is there.
According to this structure, the number of laminated steel sheets is one, and the manufacturing is easy.

(Modification 2) In the above-described embodiment, the two kinds of laminating steel sheets have slit holes 21 in the teeth portion 21a.
Although the example in which d and 21f are formed is shown, the laminated steel plates Y on both end sides have slit holes 2 over the entire teeth portion 21a.
It is not necessary to form 1f, and the laminating steel plate X excluding both end sides
The slit hole 21d and the slit hole 21f of the laminating steel plates Y on both ends may be partially communicated with each other. For example, the slit holes 21f of the steel plates Y for lamination on both ends need only be able to secure an opening, and the portion of the core body 21c where the winding wire 22 is not wound and the teeth portion 21 near the core body 21c.
It is also possible to form only the portion on the a side and not form the slit holes in the other tooth portions 21a. According to this structure, in insulating coating with powder, it is possible to prevent coating of the through holes of the teeth and invasion of foreign matter into the through holes, and to expose the metal surface to the end of the through holes. The effect can be secured sufficiently.

[0023]

As described above, according to the present invention, for example, when a blower motor operates at a high output, a high current flows through a copper wire forming a winding to generate heat, but an armature core adjacent to the winding is generated. The heat is transferred to the heat exchanger, and this heat is radiated (cooled) by the cooling air flowing through the through holes as well as the cooling area is increased by forming the through holes, thereby improving the cooling performance and the cooling performance. As a result, it becomes possible to obtain a high output of the rotating electric machine. Thus, according to the present invention, it is possible to reduce the weight, without forcibly increasing the cooling air volume,
An armature for a rotary electric machine and a rotary electric machine with improved cooling performance can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a laminating steel plate according to the present invention.

FIG. 2 is a plan view of a laminating steel plate on the core end surface side of the armature for a rotary electric machine according to the present invention.

FIG. 3 is a plan view of an armature core formed using the laminating steel plate of FIGS. 1 and 2.

FIG. 4 is a perspective view of an armature core formed using the laminating steel plate of FIGS. 1 and 2.

FIG. 5 is an explanatory cross-sectional view of a rotating electric machine.

[Explanation of symbols]

10 housing, 11 stator, 20 armature,
21 armature core, 21a teeth portion, 21b
Slot part, 21c core body part, 21d, 21
f slit hole, 21e hole, 22 winding wire, 23
Rotating shaft, 24 through holes, 30 commutator, 40 brush device, 50 bearing, 60 flange, X, Y
Laminated steel plate, S rotating electric machine.

Claims (8)

[Claims] 1. An armature for a rotary electric machine, wherein a winding is wound around an armature core, wherein a core around which the winding is wound is formed in a core of the armature, and the tooth has an inside. An armature for a rotating electric machine, characterized in that a heat radiating surface penetrating in the axial direction is formed. 2. The armature for a rotary electric machine according to claim 1, wherein the core is formed by laminating a plurality of core sheets. 3. An opening is formed at an end of the radiating surface that penetrates the opening, and the opening is formed so as not to be closed when the winding is wound. Alternatively, the armature for a rotating electric machine according to item 2. 4. The armature for a rotary electric machine according to claim 1, wherein the armature is coated with an insulating coating of powder. 5. A rotating electric machine comprising a stator and an armature arranged inside the stator and having a core, wherein the core of the armature has teeth around which windings are wound. Is
A rotating electric machine, wherein a heat radiating surface that penetrates the inside in the axial direction is formed on the teeth. 6. The rotating electric machine according to claim 5, wherein the core is formed by laminating a plurality of core sheets. 7. An opening is formed at an end of the radiating surface which penetrates, and the opening is formed so as not to be blocked when the winding is wound. Alternatively, the rotating electric machine according to item 6. 8. The rotary electric machine according to claim 5, wherein the armature is coated with an insulating coating of powder.