JPH099575A - Rotary electric machine - Google Patents

Abstract

PURPOSE: To obtain a rotary electric machine having an excellent cooling capacity by providing a plurality of fins on the inner wall of a housing. CONSTITUTION: A rotary electric machine seals an exchange mechanism having a stator 3 and a rotor 4 by a housing having a frame 1 and end brackets 2a, 2b, sucks the atmosphere from the ventilation inlet 10a of an end cover 10 and diffuses it from the ventilation outlet 10b when an outer fan 9 rotates together with the rotor 4. Since the air passes the surfaces of radiation fins 13a, 13b, the frame 1 is cooled. On the other hand, since an inner fan 12 rotates together with the rotor 4, an air flow generates in the machine, passes while cooling the end ring 11 and both the end faces of a stator coil 7 and a stator core 6, then passes the surfaces of radiation fins 14a, 14b so that heat is removed, and the heat is transferred to the fins 13a, 13b to be radiated. As a result, the heat transfer area is increased by the amount providing the plurality of fins to improve the cooling capacity of the machine.

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 in which a conversion mechanism for converting electric energy into mechanical rotational force is housed inside a housing.

[0002]

2. Description of the Related Art A rotary electric machine in which a conversion mechanism for converting electric energy into a mechanical rotary force is housed in a housing is, for example, a fully closed rotary electric machine as shown in FIG. 10 and a rotary electric machine as shown in FIG. It is roughly divided into such open-type rotary electric machines.

The conventional example of the fully closed type shown in FIG. 10 is roughly divided into the following structures.

That is, the housing composed of the frame 601 and the end brackets 2a and 2b, the stator 3 and the rotor 4 for generating a mechanical rotational force from the supplied electric energy, and the generated rotational force. It is configured to have a mechanism (rotary shaft 8, bearings 5a, 5b) for transmitting to the outside. The stator 3 includes a stator core 6 and a stator coil 7 wound around the stator core 6.

One end side (right side in the figure) of the rotary shaft 8 is inserted through the bearing 5b and protrudes to the outside to form an output shaft. On the other end side (left side in the figure) of the rotary shaft 8, an external cooling fan (hereinafter referred to as an outer fan) is provided at a portion protruding from the bearing 5a.
9 is attached.

The outer fan 9 is covered with an end cover 10. The front side of the end cover 10 is provided with an opening 10a (hereinafter referred to as a ventilation inlet) for taking in outside air. The rear side of the end cover 10 has an opening 10b.
(Hereinafter, referred to as a ventilation outlet).

The rotor 4 is provided with an internal cooling fan 12 (hereinafter referred to as an internal fan) composed of a plurality of blade blades.

When the outer fan 9 rotates together with the rotor 4, the outside air is sucked from the ventilation inlet 10a of the end cover 10 and blown out from the ventilation outlet 10b. The blown outside air passes through the surface of the heat radiation fin 614 as indicated by arrow A. The frame 601 is cooled by this ventilation.

On the other hand, since the inner fan 12 also rotates together with the rotor 4, the air inside the machine circulates and a cooling action is generated thereby.

In the open type conventional example of FIG. 11, the internal mechanism such as the stator 3 and the rotor 4 is substantially the same as that of the fully closed type of FIG. 10, but the outside air around the machine body is inside the machine. Is available for distribution.

That is, the end bracket 102a having the ventilation inlet 110a and the ventilation outlet 110b formed at both ends of the frame 701, the ventilation inlet 110c and the ventilation outlet 11 respectively.
The end bracket 102b on which 0d is formed is attached.

When the inner fan 12 rotates together with the rotor 4, outside air is sucked in through the ventilation openings 110a and 110c. The sucked outside air removes heat inside the machine body and is then discharged from the ventilation outlets 110b and 110d as indicated by arrow A.

[0013]

Recently, the miniaturization of devices has been attempted in various fields, and rotary electric machines are no exception. Therefore, various proposals have been made regarding ideas regarding internal devices for realizing miniaturization of rotating electrical machines, including electrical ones and mechanical ones. The miniaturization of rotating electrical machines is, of course,
This means miniaturization of the housing itself.

However, for example, in the case of a fully-closed rotary electric machine as shown in FIG. 10, the heat radiation fin 614 naturally becomes smaller as the size is reduced. If the heat radiation fins 614 are small, the heat radiation area is reduced, so that the device main body cannot perform sufficient heat radiation and is easily overheated. Also,
In the case of the open type rotary electric machine as shown in FIG. 11, the cooling fan is also small. If the cooling fan becomes smaller, the amount of cooling air will decrease, and the temperature of the equipment will inevitably rise.

Needless to say, the improvement of the cooling capacity is an important issue even in a normal rotating electric machine in which downsizing is not particularly considered.

In consideration of the above problems, an object of the present invention is to provide a rotating electric machine having an excellent cooling capacity.

[0017]

According to a first aspect of the present invention for achieving the above object, a rotary electric machine in which a conversion mechanism for converting electric energy into a mechanical rotational force is housed inside a housing. In the above, there is provided a rotary electric machine characterized in that a plurality of fins are provided on the inner wall of the housing.

According to a second aspect of the present invention for achieving the above object, in the first aspect, the conversion mechanism comprises:
The stator is fixed to the housing, and the rotor is rotatable. The stator includes a stator core and a stator coil wound around the stator core, and a part of the plurality of fins. A rotary electric machine is provided in which all or all are connected to the stator coil with a molding resin.

[0019]

According to the present invention, since the heat transfer area of the housing is increased by the plurality of fins, efficient heat transfer can be performed between the housing and the air inside the housing.

Therefore, for example, in the case of an open type rotary electric machine, the heat of the housing is efficiently radiated to the outside air taken into the machine. Further, in the case of the fully closed rotary electric machine, the housing easily receives the heat of the air circulating inside the machine.

In addition, some or all of the plurality of fins are
If the stator coil and the mold resin are coupled, the heat generated in the stator coil is not directly transmitted to the stator core, but is efficiently dissipated by the fins. Therefore, the life of the stator coil and the stator core can be extended.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention.

In this embodiment, two cylindrical members 1a and 1b are used.
A frame 1 formed by joining together, end brackets 2a and 2b attached to both ends of the frame 1, a stator 3 fixed to the frame 1, and a rotor 4 that is a rotating portion. End bracket 2a, 2b
A so-called fully-closed rotary electric machine in which a housing made of is hermetically sealing a conversion mechanism composed of a stator 3 and a rotor 4 (specifically, a mechanism for converting electric energy into mechanical rotational force). I am configuring.

The end brackets 2a and 2b are also called bearing brackets and house the bearings 5a and 5b. The stator 3 is composed of a stator core 6 made of a laminated body of silicon steel plates, and a stator coil 7 wound around a plurality of slots (not shown) provided in the inner peripheral portion of the stator core 6. .

The rotor 4 has a rotating shaft 8. Rotary axis 8
Is rotatably held by bearings 5a and 5b,
It rotates at a predetermined position facing the stator 3. Further, one end side (the right side in the figure) of the rotary shaft 8 is inserted through the bearing 5b and protrudes to the outside to form an output shaft. An external cooling fan (hereinafter referred to as an external fan) 9 is attached to the other end side (left side in the figure) of the rotary shaft 8 at a portion protruding from the bearing 5a.

The outer fan 9 is covered with an end cover 10. The front side of the end cover 10 is provided with an opening 10a (hereinafter referred to as a ventilation inlet) for taking in outside air. The rear side of the end cover 10 has an opening 10b.
(Hereinafter, referred to as a ventilation outlet).

The rotor 4 is provided with a secondary conductor bar (not shown) and an end ring 11. The end ring 11 has an internal cooling fan 1 formed integrally therewith.
2 (hereinafter referred to as an inner fan) is provided. The inner fan 12 is composed of a plurality of blade blades axially protruding from both end surfaces of the end ring 11.

The frame 1 is composed of the two cylindrical members 1a and 1b as described above, and the details thereof are as shown in FIG. Since the cylindrical members 1a and 1b are symmetrical with each other, here, the cylindrical member 1a
Description will be made by taking b as an example.

A plurality of plate-shaped heat radiation fins 13b extending in the axial direction are radially provided on the outer peripheral surface of the cylindrical member 1b. Further, a plurality of heat radiation fins 14b having a shorter length than the heat radiation fins 13b are radially provided on the inner peripheral surface of the cylindrical member 1b. Since the stator 3 is incorporated in the vicinity of the inner center of the frame 1 as shown in FIG. 1,
The radiating fins 14b are arranged so as not to interfere with them.

Next, the operation of this embodiment will be described.

In FIG. 1, when the outer fan 9 rotates together with the rotor 4, the outside air is sucked from the ventilation inlet 10a of the end cover 10 and blown out from the ventilation outlet 10b. The outside air blown out is radiating fins 13a, 1
Pass the surface of 3b as indicated by arrow A. The frame 1 is cooled by this ventilation.

On the other hand, since the inner fan 12 also rotates with the rotor 4, an air flow is generated inside the machine. This air passes while cooling both end surfaces of the end ring 11, the stator coil 7, and the stator core 6. The air whose temperature has risen due to the cooling then passes through the surfaces of the radiation fins 14a and 14b, and the heat is taken by these. This heat is transferred to the above-mentioned heat radiation fins 13a and 13b and is radiated.

If the heat dissipating fins 14a and 14b are provided on the inner peripheral surface of the frame 1 as described above, the heat transfer area is increased accordingly, so that the heat of the air circulating in the machine is efficiently transferred to the heat dissipating fins 13a and 13b. I can tell.

Further, when air circulates in the machine, the radiating fins 14a and 14b also have a rectifying effect, so that
The cooling capacity of the rotating electric machine is further improved.

FIG. 3 shows a second embodiment of the present invention.

In this embodiment, the end bracket 102a is used.
, A ventilation inlet 110a and a ventilation outlet 110b are formed,
A ventilation inlet 110c and a ventilation outlet 110d are formed on the end bracket 102b, which constitutes a so-called open-type rotary electric machine that allows the outside air around the machine body to flow into and out of the machine.

In this embodiment, the stator 3 and part of the heat radiation fins 14a and 14b are solidified with the mold resin 21.

Since the structure other than these is substantially the same as that of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted. The frame 101 (cylindrical member 1
01a, 101b) is different from the above in the radiation fin 1
Neither 3a nor 13b are provided, nor is the external fan 9 attached here.

Similar to the first embodiment, when the inner fan 12 rotates together with the rotor 4, the ventilation openings 110a and 110c.
The outside air is sucked in from. The outside air sucked in is the end ring 11, the stator coil 7, and the stator core 6.
While passing through both end faces of each of the heat dissipation fins 14a and 14b as shown by the arrow A, the ventilation outlet 11
It is discharged from 0b and 110d.

According to the present embodiment, the radiation fin 1
The heat of the frame 101 is efficiently dissipated from 4a and 14b.

Further, the stator coil 7 and the radiation fin 1
Since 4a and 14b are connected by a mold resin having a higher heat transfer coefficient than that of air, heat generated in the stator coil 7 is not generated on the side of the stator core 6 but radiating fins 14a and 14b.
It can be efficiently transmitted to the b side. It should be noted that if the above-mentioned molding resin is also embedded in the gap between the stator core 6 and the frame 101, the stator core 6 will be removed from the frame 101.
The heat transfer resistance to is reduced.

FIG. 4 shows a third embodiment of the present invention.

In this embodiment, the end brackets 2a and 2b are respectively attached to the cylindrical members 1a and 1b in the first embodiment.
This is an embodiment in which 2b are integrated, and a frame 201 (cylindrical members 201a, 201b) as shown in FIG. 4 is used.

According to this structure, the heat transfer resistance between the cylindrical member and the end bracket is eliminated, and the heat radiation from the end bracket side can be increased. Further, since a member (for example, a bolt) for fastening the cylindrical member and the end bracket is not necessary, the flow of outside air as shown by arrow A is not obstructed.

FIG. 5 shows a fourth embodiment of the present invention.

In this embodiment, a frame 301 as shown in FIG. 6 is used. On the outer peripheral surface of the frame 301, a plurality of radiation fins 313 having substantially the same length as the frame 301 are radially provided. Frame 30
In No. 1, the inner diameter in the vicinity of the opening is set to be larger than the inner diameter in the vicinity of the center.
Are provided in a radial pattern. The height (radial length) of the heat radiation fin 314 is determined so that the upper surface of the heat radiation fin 314 matches the inner peripheral surface near the center of the frame 301. With this configuration, the radiation fins 314 do not get in the way when the stator 3 is fitted to the inner peripheral surface near the center of the frame 301. Note that such a step structure does not necessarily have to be provided in both openings of the frame 301.
Should be incorporated.

FIG. 7 shows a fifth embodiment of the present invention.

This embodiment has a structure in which the mold resin is not provided in the second embodiment. Even with such a structure, the heat radiation area is increased by the amount corresponding to the heat radiation fins 14a and 14b. Therefore, the cooling capacity is sufficiently improved.

FIG. 8 shows a sixth embodiment of the present invention.

This embodiment is an embodiment in which the end brackets 102a and 102b are integrated with the cylindrical members 101a and 101b in the fifth embodiment, and a frame 401 (as shown in FIG. 8). Cylindrical member 40
1a, 401b).

With this arrangement, heat transfer resistance between the cylindrical member and the end bracket is eliminated, and heat radiation from the end bracket side can be increased. Further, a member (for example, a bolt) for fastening the cylindrical member and the end bracket becomes unnecessary.

FIG. 9 shows a seventh embodiment of the present invention.

In this embodiment, the frame 5 as shown in FIG.
01 (frame in which outer peripheral fins are removed from the frame 301 shown in FIG. 6) is used to realize an open-type rotary electric machine. Even with this structure, the same effect as that of the fifth embodiment can be obtained.

[0055]

According to the present invention, since a plurality of fins are provided on the inner wall of the housing, the heat transfer area of the housing is correspondingly increased and the cooling capacity of the rotary electric machine is improved.

Further, some or all of the plurality of fins are
When the stator coil and the mold resin are coupled together, the heat generated in the stator coil can be efficiently released from the fins.

[0057]

[Brief description of drawings]

FIG. 1 is a partial sectional view of a first embodiment of a rotary electric machine according to the present invention when viewed from the side.

FIG. 2 is a perspective view of a cylindrical member in the first embodiment of the rotary electric machine according to the present invention.

FIG. 3 is a partial cross-sectional view of a second embodiment of the rotary electric machine according to the present invention when viewed from the side.

FIG. 4 is a partial sectional view of a rotating electric machine according to a third embodiment of the present invention when viewed from the side.

FIG. 5 is a partial cross-sectional view of a rotary electric machine according to a fourth embodiment of the present invention when viewed from the side.

FIG. 6 is a perspective view of a frame in a fourth embodiment of the rotary electric machine according to the present invention.

FIG. 7 is a partial sectional view of a rotary electric machine according to a fifth embodiment of the present invention when viewed from the side.

FIG. 8 is a partial sectional view of a rotary electric machine according to a sixth embodiment of the present invention when viewed from the side.

FIG. 9 is a partial cross-sectional view of a rotary electric machine according to a seventh embodiment of the present invention when viewed from the side.

FIG. 10 is a partial sectional view showing an example of a conventional fully-closed rotary electric machine.

FIG. 11 is a partial cross-sectional view showing an example of a conventional open type rotary electric machine.

[Explanation of symbols]

1, 101, 201, 301, 401, 501, 60
1, 701: frame, 1a, 1b, 101a, 101
b, 201a, 201b, 401a, 401b: Cylindrical member, 2a, 2b, 102a, 102b ,: End bracket, 3: Stator, 4: Rotor, 5a, 5
b: bearing, 6: stator core, 7: stator coil, 8: rotating shaft, 9: outer fan, 10: end cover, 10a, 110a, 110c: ventilation inlet, 1
0b, 110b, 110d: ventilation outlet, 11: end ring, 12: inner fan, 13a, 13b, 14
a, 14b, 313, 314, 614: radiation fins,
21: Mold resin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Sekine, 7-1, 1-1 Higashi Narashino, Narashino, Chiba Prefecture Industrial Equipment Division, Hitachi, Ltd. (72) Inventor Keiichiro Kaichiro 7, 1-1, Higashi Narashino, Narashino, Chiba Prefecture Issue Hitachi Industrial Co., Ltd. Industrial Equipment Division (72) Inventor Takuya Abe 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) Inventor Keisuke Yamanaka 1-1-1, Higashi Narashino, Narashino City, Chiba Prefecture Industrial Machinery Division, Hitachi, Ltd.

Claims (2)

[Claims] 1. A rotary electric machine in which a conversion mechanism for converting electric energy into a mechanical rotational force is housed inside a housing, wherein a plurality of fins are provided on an inner wall of the housing. 2. The conversion mechanism according to claim 1, wherein the conversion mechanism includes a stator fixed to the housing, and a rotatable rotor, and the stator includes a stator core and a stator wound around the stator core. A rotary electric machine comprising: a coil, wherein a part or all of the plurality of fins are coupled to the stator coil with a molding resin.