KR20030056638A - Arrangement for cooling electric motor - Google Patents

Abstract

PURPOSE: A cooling structure is provided to cause no volume increase without lowering a strength of an electric motor. CONSTITUTION: A stator(10) includes a fluid input path(12a), a fluid output path(12l), and intermediate paths(12b-12k) formed along a circumference direction between the paths(12a,12l). The first cover(20) is assembled at one side of the stator(10) and includes a fluid groove(22) for interconnecting opened one sides of the paths(12a-12l). The second cover(30) is assembled at the other side of the stator(10) and includes a fluid groove(32) for interconnecting opened other sides of the paths(12a-12l). A plurality of block members are configured to block the fluid grooves of the first and second covers so that the paths(12a-12l) are cascaded in zigzag.

Description

Cooling structure of electric motor {ARRANGEMENT FOR COOLING ELECTRIC MOTOR}

The present invention relates to a cooling structure of the electric motor, and more particularly to a cooling structure of the electric motor that can effectively cool the generated heat.

The electric motor emits part of the electric energy with heat loss during operation. This heat loss is a cause of lowering the mechanical characteristics of the motor and shortening the life of the motor, it is important to reduce the heat loss and to efficiently cool the generated heat in the design of the motor.

As a method of cooling the electric motor, there is an air-cooled cooling method using air. In the air-cooled cooling method, an air passage is formed around the motor housing, and then, by using a separate cooling fan, the cooling air is blown into the air passage or the surrounding air of the motor housing is sucked into the air passage to discharge the electric motor. It is a method of cooling. However, this air-cooled cooling method has been pointed out that the hot air generated in the passage through the air passages overheat other devices around the electric motor.

On the other hand, in consideration of this, in recent years, a fluid cooling method for cooling an electric motor using a fluid such as water or oil has been proposed. As an example, Japanese Patent Laid-Open No. 2-55551 shows that a plurality of cooling passages are formed in the stator of the electric motor along the axial direction, and the end bell of the electric motor has an axial hole communicating with the respective cooling passages; Each of the cooling passages are connected in series with each other by forming a right-angled hole connecting each of the axial holes with each other, and the electric motor is cooled by circulating the cooling fluid in series with the cooling passages connected in series.

However, this fluid cooling method has the advantage of cooling the generated heat efficiently, but by forming an axial hole or a right angle hole in the end bell supporting the rotor, the strength of the end bell is reduced, and the vibration It is pointed out that the lowering of the resistance characteristics.

On the other hand, as another example of the fluid cooling method, European Patent No. 924839, a plurality of cooling passages are formed in the stator of the electric motor along the axial direction, and the two sides of the stator communicate with each of the cooling passages at right angles. A hole is formed, and the cooling flow path is connected in series by vertically installing a flow path guide plate having a communication flow path communicating with the hole before and after the stator.

However, it is pointed out that such a fluid cooling method has to secure an installation space for vertically installing the flow path guide plate, and thus cannot be applied to an electric motor in which the installation space is limited.

Accordingly, the present invention provides a cooling structure of an electric motor that uses a fluid having high cooling efficiency and does not cause an increase in volume without lowering the strength of the electric motor.

1 is a cross-sectional view showing a cooling structure of an electric motor according to the present invention;

2 is a perspective view showing a main part of the present invention;

3 and 4 are cross-sectional views taken along lines A-A and B-B of FIG. 2.

♣ Explanation of symbols for the main parts of the drawing ♣

One; Motor housing 10: stator

12: fluid passage 12a: fluid introduction passage

12b to 12k: first to tenth intermediate passages 12 l: fluid discharge passage

20: first cover 22: euro groove

24: introduction hole 26: discharge hole

30: second cover 32: euro groove

40: fastening bolt 42: through hole

44: fastening hole

In order to achieve the above object, the present invention provides a cooling structure of an electric motor using a fluid, wherein both sides are open along a circumferential direction between a fluid introduction passage and a fluid discharge passage and a circumferential direction between the fluid introduction passage and the fluid discharge passage. A stator having intermediate passages in the longitudinal direction formed on both sides thereof; A first cover assembled to one side of the stator and having a flow path groove communicating with one side of each of the passages; A second cover which is assembled to the other side of the stator and has a flow path groove communicating with the other side of each of the passages; It characterized in that it comprises a plurality of blocking members for blocking the flow path grooves of the first and second cover so that the fluid introduction passage, the intermediate passage and the fluid discharge passage can be connected in series.

Preferably, the blocking member blocks the open side of the fluid introduction passage and the fluid discharge passage, blocks the open side of the fluid introduction passage and the intermediate passage, and alternately blocks the open side of the intermediate passages. A plurality of fastening bolts fastened to the first cover and the stator to block the flow path grooves of the first cover, and to block the other side of the fluid introduction passage and the fluid discharge passage, and to alternately block the other sides of the intermediate passages. A plurality of fastening bolts fastened to the second cover and the stator to block the flow path grooves of the second cover.

Hereinafter, a preferred embodiment of the cooling structure of the electric motor according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a cooling structure of an electric motor according to the present invention, Figure 2 is a perspective view showing the main part of the present invention, Figure 3 and Figure 4 is a cross-sectional view taken along line A-A and line B-B of FIG. First, prior to looking at the cooling structure of the present invention with reference to Figure 1 briefly look at the configuration of the electric motor, the electric motor is provided with a motor housing (1), the motor housing (1) operating chamber (1a) Equipped) The operating chamber 1a of the motor housing 1 is configured to be closed by the end bell 3. In addition, a rotation shaft 5 is rotatably installed in the drive chamber 1a of the motor housing 1, and a rotor 7 is installed at the periphery of the rotation shaft 5, and at the periphery of the rotor 7. The stator 10 is disposed. The stator 10 is fixedly installed on the inner circumferential surface of the motor housing 1.

On the other hand, the cooling structure of the present invention forms a plurality of fluid passages 12 in the longitudinal direction in the stator 10, the first and the second surface of the fluid passages 12 in series with each other on both sides of the stator 10 and It can be seen that the second covers 20 and 30 are installed.

Looking at this in detail with reference to Figures 2 to 4, first, a plurality of fluid passages 12 are formed in the stator 10 in the longitudinal direction. The fluid passage 12 is configured to penetrate through the stator 10 and open to both sides of the stator 10, and is formed along the circumferential direction of the stator 10. Here, the fluid passages 12 are preferably formed as even as many as possible without limiting the strength of the stator 10 and not affecting the magnetic path. In the present invention, it is shown that the fluid passage 12 is formed of 12 along the circumferential direction of the stator 10.

On the other hand, of the plurality of fluid passages 12 formed in the stator 10, any one of the fluid passages 12 becomes a fluid introduction passage 12a into which the cooling fluid is introduced, and is adjacent to the fluid introduction passage 12a. The other fluid passage 12L becomes the final fluid discharge passage 12L of the cooling fluid passing through the plurality of fluid passages 12. For convenience, the fluid passage 12 located at the top of the figure is defined as the fluid introduction passage 12a, and the fluid passage 12 formed along the clockwise direction from the fluid introduction passage 12a is first to tenth intermediate passages. (12b to 12k) will be arbitrarily determined, and the fluid passage 12 disposed on the left side of the fluid introduction passage 12a will be defined as the fluid discharge passage 12L.

In addition, the cooling structure of the present invention has a ring type first cover 20 and a second cover 30 coupled to both side surfaces of the stator 10. The first cover 20 and the second cover 30 are provided with annular flow path grooves 22 and 32 formed in the circumferential direction so as to communicate one open side and the other open side of the fluid passages 12 with each other. In particular, the first cover 20 has an introduction hole 24 and an outlet hole 26 in alignment with the fluid introduction passage 12a and the fluid discharge passage 12L of the stator 10. 24 and the discharge hole 26 are respectively connected to the fluid pump and the fluid tank (not shown) through the connecting pipe (P) is configured to introduce the cooling fluid or to discharge the cooling fluid.

The first and second covers 20 and 30 are assembled to the stator 10 by the fastening bolts 40. For this purpose, the fastening bolts 40 are fitted to the first and second covers 20 and 30. A plurality of through holes 42 are formed, and the stator 10 has a plurality of fastening holes 44 to which the fastening bolts 40 are fastened. As the fastening bolt 40 is fitted into the through holes 42 and the fastening holes 44 aligned with each other, the first and second covers 20 and 30 are assembled on both sides of the stator 10. Here, a ring-shaped seal 14 for airtightness is disposed between the first cover 20, the stator 10, and the second cover 30, and the stator 10, respectively. It is configured to fit in the seal groove (20a, 30a) formed in the first and second covers (20, 30).

On the other hand, the cooling structure of the present invention, the first and second cover 20, so as to connect the fluid introduction passage (12a), the plurality of intermediate passages (12b to 12k) and the fluid discharge passage (12L) in series with each other A plurality of blocking members for blocking the flow path grooves 22 and 32 in place 30 are provided.

The blocking member uses a fastening bolt 40 for assembling the first cover 20 and the stator 10 and the second cover 30 and the stator 10, as shown in FIG. 40 is a fluid introduction passage 12a, a fluid discharge passage 12L and a fluid introduction path so that one open side of the fluid introduction passage 12a can be isolated from both side fluid discharge passages 12L and the first intermediate passage 12b. Blocking the flow path groove 22 of the first cover 20 which communicates the passage 12a with the first intermediate passage 12b, and the other side of the fluid introduction passage 12a is open only the first intermediate passage 12b. The flow path groove of the second cover 30 which communicates the fluid introduction passage 12a, the fluid discharge passage 12L, the first intermediate passage 12b, and the second intermediate passage 12c so as to be communicated with only the other side of the opening ( 32) and the second intermediate passage 12c and the third intermediate passage again allow the open side of the first intermediate passage 12b to communicate only with the open side of the second intermediate passage 12c. The flow path groove 22 of the first cover (20) for communicating the (12d) blocks.

As such, the fastening bolt 40 alternately cuts open one side and the other open side of the intermediate passages 12b to 12k, and finally communicates the fluid introduction passage by communicating the tenth intermediate passage 12k and the fluid discharge passage 12L. 12a, the plurality of intermediate passages 12b to 12k and the fluid discharge passage 12l are connected in series with each other while being connected in a zigzag manner.

Meanwhile, in the present invention, although the fastening bolt 40 for assembling the first cover 20 and the stator 10, the second cover 30, and the stator 10 is used as a blocking member, a separate blocking plate or the like is used. It is also possible to block the flow path grooves 22, 32 of the first and second covers 20, 30 by use.

And when using the fastening bolt 40 as the blocking member, the fastening bolt 40 should be larger than the cross-sectional area of the flow path grooves 22, 32, which is the cross-sectional area of the fastening bolt 40 of the flow path grooves (22, 32) This is to allow the passage grooves 22 and 32 to be sufficiently blocked by being larger than the cross-sectional area. In particular, when the fastening bolt 40 is inserted into the through hole 42 of the first and second covers 20 and 30 and the fastening hole 44 of the stator 10, the flow path grooves 22 and 32 by applying an adhesive in advance. Leakage of the fluid into the through hole 42 is prevented.

Next, look at the configuration of the present invention as follows. First, when the fluid is introduced into the introduction hole 24 of the first cover 20, the introduced fluid is introduced into the fluid introduction passage 12a of the stator 10. The fluid introduced into the fluid introduction passage 12a flows along the fluid introduction passage 12a and flows into the first intermediate passage 12b, and the fluid introduced into the first intermediate passage 12b passes through the first intermediate passage ( It flows along 12b) and flows into the 2nd intermediate path 12c. The fluid introduced into the second intermediate passage 12c is discharged to the fluid discharge passage 12l through the third to tenth intermediate passages 12d to 12k connected in turn, and the fluid discharged to the fluid discharge passage 12l is discharged. It is discharged to the outside through the discharge hole 26 of the first cover 20. As a result, the fluid flowing into the fluid introduction passage 12a flows zigzag along the fluid introduction passage 12a, the first to the tenth intermediate passages 12b to 12k, and the fluid discharge passage 12l, which are in series communication with each other. The stator 10 is to be cooled.

As described above, in the present invention, a plurality of fluid passages 12 in the longitudinal direction are formed in the stator 10, and the first cover 20 for communicating the plurality of fluid passages 12 in series on both sides of the stator 10. By installing the and the second cover 30 so that the introduced fluid can flow in sequence it is possible to effectively cool the heat of the stator (10). In addition, since there is no need for a separate installation space for installing the flow guide plate as in the related art, it has the advantage of installing a fluid cooling apparatus without increasing the motor.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

As described above, the cooling structure of the electric motor of the present invention includes a stator having a plurality of longitudinal fluid passages, and a first cover and a second cover disposed on both sides of the stator to communicate the plurality of fluid passages in series. The introduced fluid flows naturally around the stator to allow cooling of the stator. In particular, in order to communicate the cooling passages of the stator in series as in the prior art, it is not necessary to form a hole in the end bell or install a separate flow guide plate, so it is also applicable to a small electric motor without reducing the strength of the motor. It has the advantage of being able to.

Claims (3)

In the cooling structure of an electric motor using a fluid, Longitudinal direction in which both sides are formed at intervals along the circumferential direction between the fluid introduction passage 12a and the fluid discharge passage 12l in the longitudinal direction, and the fluid introduction passage 12a and the fluid discharge passage 12l in the open direction. A stator 10 having intermediate passages 12b to 12k of; A first cover (20) assembled to one side of the stator (10) and having a flow path groove (22) for communicating one open side of the passages (12a to 12L); A second cover (30) assembled to the other side of the stator (10) and having a flow path groove (32) communicating with the other side of each of the passages (12a to 12L); Of the flow path grooves 22 and 32 of the first and second covers 20 and 30 so that the fluid introduction passage 12a, the intermediate passages 12b to 12k and the fluid discharge passage 12l may be connected in series. Cooling structure of an electric motor comprising a plurality of blocking members for blocking. The method of claim 1, wherein the blocking member blocks the open side of the fluid introduction passage 12a and the fluid discharge passage 12l, and blocks the open side of the fluid introduction passage 12a and the intermediate passage 12b. A plurality of fastenings are connected to the first cover 20 and the stator 10 to alternately block open sides of the intermediate passages 12b to 12k to block the flow path grooves 22 of the first cover 20. Fastening bolts (40) and The second cover 30 and the stator 10 to block the other open side of the fluid introduction passage 12a and the fluid discharge passage 12L, and alternately block the other open sides of the intermediate passages 12b to 12k. Cooling structure of the electric motor, characterized in that the plurality of fastening bolts 40 are fastened to the blocking the flow path groove 32 of the second cover (30). The inlet opening 24 and the discharge hole 26 are formed in the first cover 20 in alignment with the fluid introduction passage 12a and the fluid discharge passage 12L of the stator 10. Cooling structure of the electric motor, characterized in that.