JPH09103041A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance thermal conduction between an aluminum diecast housing frame and a stator by coating the outer circumferential surface of a stator with an adhesive and then fitting the stator to the inner circumferential surface of aluminum diecast housing frame. SOLUTION: The gap formed between an aluminum diecast housing frame 1 and a stator 2 due to the level difference of the outer circumferential surface 2A of stator is filled with an adhesive 3A. More specifically, the gap (air layer) between the aluminum diecast housing frame 1 and the stator 2 is filled with the adhesive 3A having higher thermal conductivity than the air. Consequently, the gap at fitting part is prevented from enlarging due to thermal expansion of the aluminum diecast housing frame 1 caused by heat generated during operation. Heat generated in an electric rotating machine is transmitted efficiently from the stator 2 to the housing frame 1, thus enhancing thermal conduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine assembled by fitting a stator to an inner peripheral surface of an aluminum die-cast housing frame, and more particularly to improving heat conduction between the aluminum die-cast housing frame and the stator. It is about.

[0002]

2. Description of the Related Art Conventionally, as a method of attaching a stator to a housing frame in a rotating electric machine, as shown in FIG. 35, a method of fixing the stator by fitting it into the housing frame is known. There is.

In FIG. 35, reference numeral 4 denotes a housing frame in which the stator 2 is attached. And
End brackets 5A and 5B are engaged with both ends of the housing frame 4 and fixed with bolts or the like.

Bearings 6A and 6B are provided on the end brackets 5A and 5B, respectively, and the rotary shaft 7 is supported by these bearings.

An iron core of the rotor 8 is fixed near the center of the rotary shaft 7 by fitting or the like, whereby a magnetic path is formed together with the iron core of the stator 2. Although not shown, the rotor 8 is provided with a cage winding integrally with the end ring 9 by die casting or the like, and the end ring 9 is provided with a fan for internal cooling. A blade 10 is provided.

Therefore, when a predetermined alternating current is supplied to the stator coil 11 provided on the stator 2, a rotating magnetic field is created, and an alternating secondary current flows through the cage winding of the rotor 8,
Torque is generated, and the rotating shaft 7 is rotated together with the rotor 8.

When the rotating electricity is operated, heat is generated due to the loss internally generated and the temperature rises. Most of the heat generated inside the rotating electricity is radiated from the stator 2 to the outside through the housing frame 4.

Therefore, the heat conduction between the housing frame 4 and the stator 2 is good or bad, that is, the fitting portion is closely attached (sealed).
Sex has an important meaning.

Although not clear from FIG. 35 in the above-mentioned prior art, the following items exist individually or in combination, and are present in the fitting portion between the inner peripheral surface of the housing frame and the stator. It causes a slight gap. Since this gap is a layer of air, heat conduction is significantly deteriorated as compared with the case where the metals are in direct contact with each other, and efficient heat dissipation cannot be performed.

In the following description, only the housing frame and the stator are taken out and shown in the drawings, and the description will be made with these.

First, as shown in FIG. 36, generally, the iron core of the stator 2 is manufactured by stacking die-cut thin iron plates having a thickness of about 0.5 mm. Therefore, the outer peripheral surface 2A of the stator is not smooth and has a very slight step, and there is a gap 12 between the housing frame 4 and the stator 2.

Next, as shown in FIG. 37, in a housing frame or the like manufactured by die casting, the inner peripheral surface 4A of the housing frame is slightly tapered (conical), and the inner diameters of both ends of the fitting portion are large. In D1 and D2, the inner diameter D2 on one side is larger, and a gap 12 is formed between the housing frame 4 and the stator 2.

Next, as shown in FIG. 38, in a housing frame and the like that is also manufactured by die casting, shot blasting is performed to remove burrs and the like generated in the product. Therefore, not only the housing frame surface 4B,
The inner peripheral surface 4A of the housing frame also becomes rough and rough, and a gap 12 is formed between the housing frame 4 and the stator 2.

Further, as shown in FIG. 39, even if the housing frame inner peripheral surface 4A and the stator outer peripheral surface 2A are processed to be smooth, it is technically difficult to make them completely coincide (close contact) with each other. Gap 1 between the stators 2
You can do 2.

In particular, since the aluminum die-cast housing frame has a large thermal expansion as compared with the iron housing frame, the extent of spread of the gap is large due to the heat generated during operation, and the existence of the gap is neglected as compared with the iron housing frame. There are things you can't do.

[0016]

SUMMARY OF THE INVENTION An object of the present invention is to improve the heat conduction between the aluminum die-cast housing frame and the stator, and to provide a rotating electric machine with good heat dissipation performance.

[0017]

In order to achieve the above object, according to the present invention, an aluminum die-cast housing frame having a cylindrical inner peripheral surface and a fixing member fitted to the inner peripheral surface of the aluminum die-cast housing frame are provided. In a rotary electric machine including a child, a filling material is inserted into a slight gap between an inner peripheral surface of an aluminum die-cast housing frame and a stator.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a rotating electric machine according to the present invention will be described in detail with reference to some illustrated embodiments.

In the following embodiments, the entire structure of the rotary electric machine is the same as that of the prior art described with reference to FIG.
In both cases, only the housing frame and the stator are taken out and shown in the drawings, and the description will be made with these.

First, as shown in FIG. 1, the first embodiment is one in which a gap 12 between a housing frame 1 made of aluminum die casting and a stator 2 caused by a step on the outer peripheral surface 2A of the stator is filled with an adhesive 3A. is there. Alternatively, as shown in FIG. 2, the inner peripheral surface 1 of the housing frame made of aluminum die casting
The gap 1 between the housing frame 1 made of aluminum die casting and the stator 2 caused by the taper (cone) shape of A
2 is filled with the adhesive 3A. Alternatively, as shown in FIG. 3, the inner peripheral surface 1 of the housing frame is formed by shot blasting a housing frame made of aluminum die casting.
Adhesive 3 is applied to the gap 12 between the aluminum die-cast housing frame 1 and the stator 2 caused by the surface roughness of A.
It is filled with A. Alternatively, as shown in FIG. 4, the adhesive 3A is applied to the gap 12 between the housing frame 1 made of aluminum die casting and the stator 2 caused by the processing tolerance.
Is filled. Alternatively, these may be performed not only individually but also in combination. The filling of the adhesive 3A can be performed by applying the adhesive 3A to the outer peripheral surface 2A of the stator, and then fitting the stator 2 into the housing frame 1 made of aluminum die casting by press fitting, shrink fitting, or the like. it can.

In this way, the gap (air layer) 12 existing between the aluminum die-cast housing frame 1 and the stator 2 has an adhesive 3A having a better heat conduction than air.
Filled with. As a result, expansion of the clearance of the fitting portion (reduction of contact area) due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced. As a result, the heat generated inside the rotating electric machine can be more efficiently transferred from the stator 2 to the housing frame 1 and radiated.

Next, in the second embodiment, as shown in FIG. 5, a silicone potting agent 3B is filled in a clearance 12 between the housing frame 1 made of aluminum die casting and the stator 2 caused by a step on the outer peripheral surface 2A of the stator. It is a thing.
Alternatively, as shown in FIG. 6, a silicone potting agent 3B is filled in the clearance between the aluminum die-cast housing frame 1 and the stator 2 which is generated by the taper (cone) shape of the aluminum die-cast housing frame inner peripheral surface 1A. Alternatively, as shown in FIG. 7, the silicone potting agent 3 is provided in the gap 12 between the housing frame 1 made of aluminum die casting and the stator 2 caused by the surface roughness of the inner peripheral surface 1A of the housing frame made by shot blasting of the housing frame made of aluminum die casting.
It is filled with B. Alternatively, as shown in FIG. 8, the silicone potting agent 3B is filled in the gap 12 between the aluminum die-cast housing frame 1 and the stator 2 which is caused by the processing tolerance. Alternatively, these may be performed not only individually but also in combination. The filling of the silicone potting agent 3B is carried out on the outer peripheral surface 2A of the stator.
After applying the adhesive 3A to the housing 2, it can be performed by fitting the stator 2 to the housing frame 1 made of aluminum die casting by press fitting, shrink fitting, or the like.

In this manner, the gap (air layer) existing between the aluminum die-cast housing frame 1 and the stator 2 is filled with the silicone potting agent 3B having a higher thermal conductivity than air. As a result, expansion of the clearance of the fitting portion (reduction of contact area) due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced. As a result, the heat generated inside the rotating electric machine is more efficiently transferred from the stator 2 to the housing frame 1,
Can dissipate heat.

Next, in the third embodiment, as shown in FIG. 9, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the step of the outer peripheral surface 2A of the stator is filled with the adhesive 3C containing a filler. Is. Or Figure 1
As shown in 0, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the taper (cone) shape of the inner peripheral surface 1A of the aluminum die-cast housing frame is filled with the adhesive agent 3C containing a filler. Alternatively, as shown in FIG. 11, a filler-containing adhesive 3C is provided in the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the surface roughness of the housing frame inner peripheral surface 1A by shot blasting of the aluminum die-cast housing frame. It is filled. Alternatively, as shown in FIG. 12, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by processing tolerances is filled with a filler-containing adhesive 3C. Alternatively, these may be performed not only individually but also in combination. Filling the adhesive with filler 3C
This can be done by applying the filler-containing adhesive 3C to the outer peripheral surface 2A of the stator, and then fitting the stator 2 to the housing frame 1 made of aluminum die casting by press fitting, shrink fitting, or the like.

In this way, the gap (air layer) existing between the aluminum die-cast housing frame 1 and the stator 2 is filled with the filler-containing adhesive 3C having a higher thermal conductivity than air. As a result, expansion of the clearance of the fitting portion (reduction of contact area) due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced. As a result, the heat generated inside the rotating electric machine can be more efficiently transferred from the stator 2 to the housing frame 1 and radiated.

Next, in the fourth embodiment, as shown in FIG. 13, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the step on the outer peripheral surface 2A of the stator is filled with an adhesive 3D containing aluminum powder. It was done. Alternatively, as shown in FIG. 14, the aluminum die-cast housing frame 1 and the stator 2 are formed by the taper (cone) shape of the inner peripheral surface 1A of the aluminum die-cast housing frame.
The gap 3 is filled with an adhesive 3D containing aluminum powder. Alternatively, as shown in FIG. 15, the aluminum die-cast housing frame 1 and the stator 2 caused by the surface roughness of the housing frame inner peripheral surface 1A by the shot blasting of the aluminum die-cast housing frame.
The gap 3 is filled with an adhesive 3D containing aluminum powder. Alternatively, as shown in FIG. 16, the housing frame 1 made of aluminum die-casting caused by the processing tolerance.
The gap between the stator 2 and the stator 2 is filled with an adhesive 3D containing aluminum powder. Alternatively, these may be performed not only individually but also in combination. Aluminum powder adhesive 3D
Is filled with an adhesive 3 containing aluminum powder on the outer peripheral surface 2A of the stator.
This can be done by applying D and then fitting the stator 2 to the housing frame 1 made of aluminum die-cast by press fitting, shrink fitting, or the like.

In this manner, the gap (air layer) existing between the aluminum die-cast housing frame 1 and the stator 2 is filled with the aluminum powder-containing adhesive 3D, which has better thermal conductivity than air. As a result, expansion of the clearance of the fitting portion (reduction of contact area) due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced. As a result, the heat generated inside the rotating electric machine can be more efficiently transferred from the stator 2 to the housing frame 1 and radiated.

Next, in the fifth embodiment, as shown in FIG. 17, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the step of the outer peripheral surface 2A of the stator is filled with the heat radiating compound 3E. is there. Alternatively, as shown in FIG. 18, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the taper (cone) shape of the aluminum die-cast housing frame inner peripheral surface 1A is filled with a heat dissipation compound 3E. Alternatively, as shown in FIG. 19, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the surface roughness of the housing frame inner peripheral surface 1A by the shot blasting of the aluminum die-cast housing frame is filled with the heat dissipation compound 3E. It is a thing.
Alternatively, as shown in FIG. 20, a housing frame 1 and a stator 2 made of aluminum die casting, which are caused by machining tolerances.
The heat-dissipating compound 3E is filled in the gap between and. Alternatively, these may be performed not only individually but also in combination. The heat dissipation compound 3E can be filled by applying the heat dissipation compound 3E to the outer peripheral surface 2A of the stator and then fitting the stator 2 into the aluminum die-cast housing frame 1 by press fitting, shrink fitting, or the like. it can.

In this way, the gap (air layer) existing between the aluminum die-cast housing frame 1 and the stator 2 is filled with the heat radiating compound 3E, which has better heat conduction than air. As a result, expansion of the clearance of the fitting portion (reduction of contact area) due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced.
As a result, the heat generated inside the rotating electric machine is
The heat can be more efficiently transmitted to the housing frame 1 and radiated.

Next, in the sixth embodiment, as shown in FIG. 21, the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the step on the outer peripheral surface 2A of the stator is filled with the heat-radiating silicone compound 3F. It is a thing. Alternatively, as shown in FIG. 22, the aluminum die-cast housing frame 1 is formed by the taper (cone) shape of the inner peripheral surface 1A of the aluminum die-cast housing frame.
The gap between the stator and the stator 2 is filled with a heat-dissipating silicone compound 3F. Alternatively, as shown in FIG. 23, a heat-radiating silicone compound 3F is provided in the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the surface roughness of the inner peripheral surface 1A of the housing frame by shot blasting of the aluminum die-cast housing frame. It is filled. Alternatively, FIG.
As shown in FIG. 3, the gap between the housing frame 1 made of aluminum die casting and the stator 2 caused by the processing tolerance is filled with the heat dissipation silicone compound 3F. Alternatively, these may be performed not only individually but also in combination. To fill the heat-dissipating silicone compound 3F, apply the heat-dissipating silicone compound 3F to the outer peripheral surface 2A of the stator, and then fit the stator 2 into the aluminum die-cast housing frame 1 by press fitting or shrink fitting. Can be done by

In this manner, the gap (air layer) existing between the aluminum die-cast housing frame 1 and the stator 2 is filled with the heat-dissipating silicone compound 3F, which has better heat conduction than air. As a result, expansion of the clearance of the fitting portion (reduction of contact area) due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced. As a result, the heat generated inside the rotating electric machine can be more efficiently transferred from the stator 2 to the housing frame 1 and radiated.

Next, in the seventh embodiment, as shown in FIG. 25, a thin metal sheet 3G is loaded in the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the step of the outer peripheral surface 2A of the stator. Is. Alternatively, FIG.
As shown in FIG. 6, a thin metal sheet 3G is loaded in the gap between the aluminum die-cast housing frame 1 and the stator 2 which is created by the taper (cone) shape of the aluminum die-cast housing frame inner peripheral surface 1A. Alternatively, as shown in FIG. 27, a thin metal sheet 3G is loaded in the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the surface roughness of the housing frame inner peripheral surface 1A by shot blasting of the aluminum die-cast housing frame. It was done. Alternatively, as shown in FIG. 28, a thin metal sheet 3G is loaded in the clearance between the aluminum die-cast housing frame 1 and the stator 2 which is caused by a processing tolerance. Alternatively, these may be performed not only individually but also in combination. To load the thin metal sheet 3G, as shown in FIG. 33, the stator outer peripheral surface 2A is covered with the thin metal sheet 3G, and then the stator 2 is fitted to the aluminum die-cast housing frame 1 by shrink fitting or the like. Can be done by doing.

In this way, the gap (air layer) existing between the aluminum die-cast housing frame 1 and the stator 2 is filled with the thin metal sheet 3G having a better thermal conductivity than air. As a result, an increase in the clearance (decrease in contact area) of the fitting portion due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced. As a result, the heat generated inside the rotating electric machine can be more efficiently transferred from the stator 2 to the housing frame 1 and radiated.

In the eighth embodiment, as shown in FIG. 29, an aluminum foil 3H is loaded in the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the step on the outer peripheral surface 2A of the stator. is there. Alternatively, as shown in FIG. 30, an aluminum foil 3H is loaded in the clearance between the aluminum die-cast housing frame 1 and the stator 2 which is formed by the taper (cone) shape of the inner surface 1A of the aluminum die-cast housing frame. Alternatively, FIG.
As shown in FIG. 3, the aluminum foil 3 is provided in the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the surface roughness of the inner peripheral surface 1A of the housing frame by shot blasting of the aluminum die-cast housing frame.
It is loaded with H. Alternatively, as shown in FIG. 32, an aluminum foil 3H is formed in the gap between the aluminum die-cast housing frame 1 and the stator 2 caused by the processing tolerance.
It is loaded with. Alternatively, these may be performed not only individually but also in combination. Loading aluminum foil 3H
As shown in FIG. 34, this can be performed by covering the outer peripheral surface 2A of the stator with aluminum foil 3H and then fitting the stator 2 to the housing frame 1 made of aluminum die casting by shrink fitting or the like.

In this way, the gap (air layer) existing between the aluminum die-cast housing frame 1 and the stator 2 is filled with the aluminum foil 3H, which has better thermal conductivity than air. As a result, expansion of the clearance of the fitting portion (reduction of contact area) due to thermal expansion of the aluminum die-cast housing frame due to heat generation during operation is reduced. As a result, the heat generated inside the rotating electric machine can be more efficiently transferred from the stator 2 to the housing frame 1 and radiated.

[0036]

According to the present invention, the heat dissipation performance of a rotating electric machine is improved by a simple method of applying or coating a filler on the outer peripheral surface of the stator core and then fitting the stator to the housing frame. The effect is that it can be done.
Further, the improvement of heat dissipation (cooling) performance has an effect of contributing to downsizing of the rotating electric machine.

[Brief description of the drawings]

FIG. 1

FIG. 4 is a cross-sectional view showing a first embodiment of the rotating electric machine according to the present invention.

[Figure 5]

FIG. 8 is a sectional view showing a second embodiment of the rotating electric machine according to the present invention.

FIG. 9

FIG. 12 is a sectional view showing a third embodiment of the rotating electric machine according to the present invention.

FIG. 13

FIG. 16 is a sectional view showing a fourth embodiment of the rotating electric machine according to the present invention.

FIG.

FIG. 20 is a sectional view showing a fifth embodiment of the rotating electric machine according to the present invention.

FIG. 21

FIG. 24 is a sectional view showing a sixth embodiment of the rotating electric machine according to the present invention.

FIG. 25

FIG. 28 is a sectional view showing a seventh embodiment of the rotating electric machine according to the present invention.

FIG. 29

FIG. 32 is a sectional view showing an eighth embodiment of the rotating electric machine according to the present invention.

FIG. 33 is a diagram showing a seventh embodiment of the rotating electric machine according to the present invention.

FIG. 34 is a diagram showing an eighth embodiment of the rotating electric machine according to the present invention.

FIG. 35 is a cross-sectional view showing a conventional example of a rotary electric machine.

FIG. 36

FIG. 39 is a sectional view showing a conventional example of a rotary electric machine.

[Explanation of symbols]

1 ... Aluminum die-cast housing frame, 1A ...
Aluminum die cast housing frame inner surface, 1B
… Aluminum die-cast housing frame outer surface, 2
... Stator, 2A ... Stator outer peripheral surface, 3A ... Adhesive,
3B ... Silicone potting agent, 3C ... Adhesive containing filler, 3D ... Adhesive containing aluminum powder, 3E ... Heat dissipating compound, 3F ... Heat dissipating silicone compound, 3G ... Metal sheet, 3H ... Aluminum foil, 4 ... Housing frame, 4A ... Housing frame inner peripheral surface, 4B ... Housing frame outer peripheral surface, 5A, 5B
... end bracket, 6A, 6B ... bearing, 7 ... rotating shaft, 8 ... rotor, 9 ... end ring, 10 ... vane, 11 ... stator coil, 12 ... gap part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takao Omura 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture Hitachi Industrial Co., Ltd. Industrial Equipment Division (72) Inventor Takahiro Takeda 7-1, Higashi Narashino, Narashino City, Chiba Prefecture Issue Hitachi Industrial Equipment Division (72) Inventor Eiichiro Sugawa 7-1-1 Higashi Narashino, Narashino City, Chiba Prefecture Industrial Equipment Division Hitachi, Ltd. (72) Toshifumi Suzuki 7-1 Higashi Narashino, Narashino City, Chiba Prefecture No. 1 Industrial Machinery Division, Hitachi, Ltd. (72) Keisuke Yamanaka, Keisuke Yamanaka 7-1, Higashi Narashino, Narashino City, Chiba Prefecture, Ltd. Industrial Business Division, Hitachi, Ltd. (72) Masahiro Oki, 7 Higashi Narashino, Narashino, Chiba Prefecture No. 1-1, Hitachi, Ltd. Industrial Equipment Business The inner (72) inventor Umino MoriMichi Hitachi City, Ibaraki Prefecture Omika-cho, seven chome No. 1 Co., Ltd. Hitachi, Ltd. Hitachi within the Institute

Claims (8)

[Claims] 1. A rotary electric machine comprising: an aluminum die-cast housing frame having a cylindrical inner peripheral surface; and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame. A rotating electric machine characterized in that after applying an adhesive, the stator is fitted to the inner peripheral surface of an aluminum die-cast housing frame. 2. A rotating electric machine comprising an aluminum die-cast housing frame having a cylindrical inner peripheral surface and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame, wherein the outer peripheral surface of the stator is A rotating electric machine characterized by applying a silicone potting agent and then fitting the stator to the inner peripheral surface of an aluminum die-cast housing frame. 3. A rotary electric machine comprising an aluminum die-cast housing frame having a cylindrical inner peripheral surface and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame, wherein the outer peripheral surface of the stator is A rotating electric machine characterized in that an adhesive containing a filler is applied and then the stator is fitted to the inner peripheral surface of a housing frame made of aluminum die casting. 4. A rotary electric machine comprising an aluminum die-cast housing frame having a cylindrical inner peripheral surface and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame, wherein the outer peripheral surface of the stator is A rotating electric machine characterized in that a silicone potting material containing aluminum powder is applied and then the stator is fitted to the inner peripheral surface of an aluminum die-cast housing frame. 5. A rotary electric machine comprising an aluminum die-cast housing frame having a cylindrical inner peripheral surface, and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame, wherein the outer peripheral surface of the stator is A rotating electric machine characterized by applying a heat-dissipating compound and then fitting the stator to the inner peripheral surface of an aluminum die-cast housing frame. 6. A rotary electric machine comprising: an aluminum die-cast housing frame having a cylindrical inner peripheral surface; and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame. A rotating electrical machine characterized in that a heat-dissipating silicone compound is applied and then a stator is fitted to an inner peripheral surface of an aluminum die-cast housing frame. 7. A rotary electric machine comprising: an aluminum die-cast housing frame having a cylindrical inner peripheral surface; and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame. A rotating electric machine, characterized in that a thin metal sheet is covered and then a stator is fitted to an inner peripheral surface of an aluminum die-cast housing frame. 8. A rotary electric machine comprising: an aluminum die-cast housing frame having a cylindrical inner peripheral surface; and a stator fitted to the inner peripheral surface of the aluminum die-cast housing frame. A rotating electric machine characterized in that an aluminum foil is covered and then a stator is fitted to an inner peripheral surface of an aluminum die-cast housing frame.