JP2000116059A - Totally enclosed outer cooling fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a totally enclosed outer cooling fan motor, which can improve cooling. SOLUTION: A motor main body, provided with a cooling fin 10 having a plurality of fins in the direction of a rotating shaft 7 on the outer periphery of a stator frame 2, a fan 11 fitted to the rotating shaft 7 so that it faces the end part of the motor main body 1 and a fan cover 12 which covers the cooling fin 10 and the fan 11 are installed. The fan cover 12 is fixed to the cooling fin 10, so that an intake route 12a and an exhaust route 13 are formed by the fan cover 12 and the cooling fin 10, and thus cooling can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a fully-closed rotary electric machine having an outer fan.

[0002]

2. Description of the Related Art A fully enclosed external fan type rotary electric machine has a configuration in which the inside of the rotary electric machine is not communicated with the outside. Since the temperature rises due to various losses accompanying the operation, the heat is radiated by a ventilation cooling system. I have.

In FIG. 3, a rotating electric machine main body 21 comprises a stator frame 22 and a bracket 23, and a stator core 24 is fixed inside the stator frame 22, and the stator core 24 is fixed to the stator core 24. The child winding 25 is wound. The bracket 23 supports a rotating shaft 27 via a bearing 26, and the rotating shaft 27 is provided with a rotor core 29 to which a rotor conductor 28 is fixed. Stator frame 22
The cooling fins 30 are formed on the outer surface of the fin 30 in a direction along the rotation axis 27. The right end of the rotating shaft 27 is a bracket 23
It is provided so as to protrude from the right end,
A cooling fan 31 is fixed and rotates integrally with the rotating shaft 27. The fan cover 32 is the fan 3
1 is attached to the rotating electrical machine main body 21. The fan cover 32 is provided with an intake path 33 for the fan 31.
And an exhaust path 34 is formed.

[0004] That is, when the fan 31 is driven to rotate with the rotation of the rotating shaft 27, the outside air is sucked from the intake port 33 a side of the fan cover 32 as shown by the arrow A, and The air is blown along the surface and discharged from the exhaust port 34 a of the fan cover 32.

On the other hand, with the operation of the rotating electric machine, iron loss occurs in the rotor core 29 and the stator core 24, copper loss occurs in the rotor conductor 28 and the stator winding 25, and friction occurs in the bearing 26. Loss occurs. Each of these losses loses heat to the air blown to the surface of the stator frame 22 via the cooling fins 30 and is radiated to the outside.

Therefore, heat radiation through the cooling fins 30, that is, the amount of air flowing along the surface of the stator frame 22 by the fan 31 is extremely important.

[0007]

However, in the above-mentioned conventional construction, the air sent to the exhaust path side by the fan tends to flow outward from the cooling fins due to its centrifugal force, so that the air flows over the entire length of the cooling fins. It escaped outside on the way without passing, and the heat exchange was insufficient and the cooling effect was small.

Therefore, in order to obtain a sufficient cooling effect, it is necessary to increase the size of the fan or increase the number of cooling fins in order to increase the amount of air flowing between the cooling fins. Problems such as a decrease in efficiency, an increase in noise, and an increase in overall weight have been caused.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a fully enclosed external fan type rotating electric machine capable of improving cooling efficiency.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating electric machine body provided with cooling fins having a plurality of fins along an axial direction of a rotating shaft on an outer periphery of a stator frame. A fan mounted on a rotating shaft so as to face an end of the rotating electric machine body; a cooling fin and a fan cover for covering the fan; and the fan cover and the cooling fin form an intake path and an exhaust path. Thus, the cooling efficiency can be improved by fixing the fan cover to the cooling fins.

[0011]

BRIEF SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating electric machine main body provided with cooling fins having a plurality of fins along an axial direction of a rotating shaft on an outer periphery of a stator frame; A fan attached to a rotating shaft so as to face an end of the electric body, a cooling fan and a fan cover that covers the fan, wherein the fan cover and the cooling fin form an intake path and an exhaust path. A fully-closed external fan-type rotating electric machine in which the fan cover is fixed to the cooling fins.

The cooling electric fin according to claim 1, wherein the cooling fins connect the outer peripheral portions to form a cylindrical surface.

Further, the fan-type rotary electric machine according to claim 1, wherein the fan cover is extended so as to cover the entire outer periphery of the cooling fin in the direction of the output shaft.

In this manner, by fixing the fan cover to the cylindrical surface connecting the outer peripheral portions of the cooling fins, the air taken in from the intake path of the fan cover hits the fan cover and the cooling fins constituting the exhaust path and generates heat. Cool the robbing stator frame.

Further, since the entire outer periphery of the cooling fins is covered and fixed by the fan cover, the air sucked from the intake passage of the fan cover does not discharge to the outside of the cooling fins but hits the fan cover and the cooling fins and is fixed. The heat of the child frame is radiated and cooled.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG. 1, an induction motor as a rotating electric machine main body 1 includes a stator frame 2 and a bracket 3
Consists of A stator core 4 is fixed inside the stator frame 2, and a stator winding 5 is wound around the stator core 4. A rotating shaft 7 is supported on each of the brackets 3 via a bearing 6, and a rotating conductor 8 is mounted on the rotating shaft 7.
Is provided. Cooling fins 10 are attached to the outer periphery of the stator frame 2 in a direction along the rotation shaft 7 and connect the outer periphery to form an outer peripheral portion 10a of a cylinder. A right end 7a of the rotating shaft 7 is provided so as to protrude from the bracket 3, and a cooling fan 11 is fixed to the right end 7a and rotates integrally with the rotating shaft 7. The fan cover 12 covers the fan 11 and is inserted and fixed to the outer peripheral portion 10 a of the cooling fin 10. This fan cover 12
Is provided with an intake port, which is an intake path 12a, at the bottom of the bowl shape, and further covers the outside of the fan 11 and is fixed to the outer peripheral part 10a so that the exhaust path 13a can be combined with the cooling fins 10.
To form

Next, the operation of the present embodiment will be described.
The main body of the induction motor is driven to rotate the rotating shaft 7 and the fan 11 together, so that the air taken in from the intake port 12a of the fan cover 12 is sent out to the exhaust path 13 via the fan 11 and the stator The cooling fins 10 attached to the frame 2 are reached. At this time, the air sent from the exhaust path 13 hits the outer peripheral portion 10a as shown by the arrow C and is deflected and passes between the cooling fins 10. That is, the air sent out by the fan 11 is deflected by hitting the fan cover 12 and the outer peripheral portion 10a of the cooling fin 10, and takes heat of the cooling fin 10 and the stator frame 2 to cool (arrow D).

As described above, since the fan cover is fixed to the cylindrical surface connecting the outer circumferences of the plurality of cooling fins mounted on the outer circumference of the stator frame, the air blown by the fan is moved along the cooling fins to the side of the stator frame. It can flow to the end, efficiently radiate the heat transmitted to the cooling fins, and improve the cooling efficiency with a simple configuration without increasing the size of the cooling fan or increasing the number of cooling fins .

In this embodiment, the cooling fins and the stator frame are formed separately, but they may be formed integrally.

(Embodiment 2) In FIG. 2, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The second embodiment differs from the first embodiment in the structure of a cooling fin provided on the outer periphery of the stator frame 2 and a fan cover for covering the cooling fin.

First, the cooling fins 14 are provided with a plurality of fins independently in the axial direction on the outer periphery of the pipe, and the inner periphery is press-fitted and fixed to the outer periphery of the stator frame. The fan cover 15 is provided with an intake port 15a at the bottom of the bowl shape, extends to near the end of the stator frame 2 so as to cover the top of the fin of the cooling fin 14, and is press-fitted and fixed to the cooling fin 14. Thus, an exhaust path 16 is formed.

As shown in FIG. 2, the air sent from the exhaust path 16 is deflected by hitting the fan cover 15 and flows along the cooling fins 14 to the left end of the stator frame 2.

According to the second embodiment, as described above, the fan cover is extended to the left end side of the stator frame so as to cover the entire cooling fin. It is deflected so as to flow to the left end side of the frame, and the cooling efficiency can be improved as in the first embodiment.

In the second embodiment as well, the cooling fins and the stator frame may be integrated.

[0027]

As is apparent from the above embodiment, according to the first aspect of the present invention, the air blown by the fan can be deflected to the stator frame side of the cooling fins. Since the flow velocity at the cooling fin surface of the frame is large and can flow over a long distance between the cooling fins, the air flow from the fan and the cooling fin can be reduced without increasing the size of the cooling fan. In this case, the heat exchange efficiency can be improved, and the temperature rise of the rotary electric motor body can be suppressed.

According to the second aspect of the present invention, the air blown by the fan can be deflected to the side of the stator fin of the cooling fin. The amount of air flowing over a long distance between the fins increases.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an electric motor according to a first embodiment of the present invention. FIG.

FIG. 2 is a sectional view of an electric motor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary electric machine main body 2 Stator frame 7 Rotating shaft 10 Cooling fin 11 Fan 12 Fan cover 12a Intake path 13 Exhaust path

Claims (3)

[Claims] 1. A rotating electric machine body provided with cooling fins having a plurality of fins along an axial direction of a rotating shaft on an outer periphery of a stator frame, and attached to the rotating shaft so as to face an end of the rotating electric machine body. And a fan cover that covers the cooling fins and the fan, and the fan cover is fixed to the cooling fins so that an intake path and an exhaust path are formed by the fan cover and the cooling fins. Rotating electric machine. 2. The fully enclosed outer fan type rotating electric machine according to claim 1, wherein the cooling fins connect the outer peripheral portions to form a cylindrical surface. 3. The fully enclosed fan-type rotary electric machine according to claim 1, wherein the fan cover extends so as to cover the outer periphery of the entire cooling fin in the output shaft direction.