KR20200127457A - Water-cooling apparatus and method for drive motor of eco-friendly vehicle, and core manufacturing method thereof - Google Patents

Abstract

The present invention is an eco-friendly vehicle driving motor water-cooled cooling device and manufacturing furnace that improves cooling performance by reducing the heat transfer path through which heat generated from the coil is transferred to the cooling water and increasing the heat transfer area, and comprises a plurality of stator cores 20, coils 30 ), a driving motor composed of a bobbin 40, in which a cooling water inlet 101 and an outlet 102 are formed in the stator core 20, and a passage communicating with the cooling water inlet 101 and the outlet 102 therein It is characterized in that a cooling flow path 100 including 103 is formed, and the flow path 103 has a "U" shape, and the cooling water inlet 101 and the outlet 102 are the stator core 20 And the core 20 is characterized in that it has a structure that is connected to each other.

Description

Eco-friendly vehicle drive motor water-cooled cooling system and cooling method and method of manufacturing drive motor {WATER-COOLING APPARATUS AND METHOD FOR DRIVE MOTOR OF ECO-FRIENDLY VEHICLE, AND CORE MANUFACTURING METHOD THEREOF}

The present invention relates to an eco-friendly vehicle driving motor water-cooled cooling apparatus and manufacturing method. Specifically, the present invention relates to a water-cooled cooling device for an eco-friendly vehicle driving motor that improves cooling performance by reducing a heat transfer path through which heat generated from a coil is transferred to cooling water and increasing a heat transfer area.

In general, fuel cells emit almost no air pollutants and generate less carbon dioxide, so they have the advantage of non-polluting power generation, and have higher power generation efficiency than conventional thermal power generation, and thus, eco-friendly vehicles using such fuel cells as a power source Development is actively taking place.

The eco-friendly vehicle as described above is equipped with an electric motor that drives the vehicle with a power source of a high voltage battery. The driving motor is composed of main parts for outputting, such as a permanent magnet, a core, and a coil. When current or magnetic force flows, heat is generated in the motor due to electric resistance and magnetoresistance generated in the parts. For this reason, a phenomenon in which component performance is irreversibly deteriorated in high temperature conditions above a certain temperature may occur, and such deterioration leads to damage to components and deterioration of motor performance. Therefore, in order to maintain the motor performance, cooling is essential to maintain the motor temperature at a certain level.

In addition, for the above reason, in order to protect internal components, a protection logic is applied to limit or block the output when the motor temperature exceeds a certain level.

Therefore, if the motor temperature can be kept low through cooling, the driving time of the motor can be increased, and thus fuel economy and operability of an eco-friendly vehicle can be improved.

On the other hand, as a method of cooling the motor, an air cooling method that attempts cooling by external cooling wind by forming a radiating fin in the motor housing, or a water cooling method that attempts cooling by cooling water by forming a cooling channel inside the motor housing or outside the stator. Can be used.

FIG. 1 shows an example of such an air-cooled method, in which a radiating fin 4 is formed in a motor housing 1 located outside the rotor 3 and the stator 2. Therefore, since the indirect cooling method through the motor housing rather than the heat source itself is used, cooling performance is deteriorated. Therefore, in the case of the air-cooled method as shown in FIG. 1, when the motor output is high and the amount of heat generated is relatively large, the cooling performance is limited. In addition, there is a problem in that it is impossible to control the cooling flow rate according to the temperature of the motor because it is an air cooling method by external cooling wind, and a running wind is usually used.

On the other hand, in the case of the water-cooled type, it is an indirect cooling method by a heat conduction mechanism between the cooling water-housing-heating source, and such a water-cooled driving motor is disclosed in Korean Patent Publication No. 2016-0056351. However, in the case of a water-cooled driving motor of an indirect cooling method, there is a disadvantage in that cooling efficiency is lowered due to a contact state between parts (contact heat resistance).

In particular, the water cooling type is a structure in which a support ring (cooler) 10 including a cooling water flow path surrounds the outside of the stator core 20, and heat generated from the coil 30 is transferred to the core 20 It is a method that passes through the interior and is delivered to the cooling water through a contact surface with the support ring (cooler) 10.

In the water-cooled motor having such a structure, a cooler through which cooling water flows is in contact with the outer peripheral surface of the stator core 20. At this time, the heat generated from the coil 30 passes through the heat transfer path of'coil 30-bobbin (insulation material) 40-core 20-cooler 10-coolant', and the heat transfer efficiency decreases. There is a problem in that the heat transfer (cooling) performance is insufficient compared to the direct cooling method of cooling with oil or the like.

1. Korean Patent Registration No. 10-1360636 (2014.02.03 publication)

1. Korean Patent Application Publication No. 10-2018-0069443 (2018.06.25 publication)

1. Korean Patent Registration No. 10-1589043 (2016.01.21 publication)

An object of the present invention is to improve cooling performance by reducing a heat transfer path through which heat generated from a coil is transferred to the cooling water and increasing a heat transfer area.

An eco-friendly vehicle driving motor water-cooled cooling device according to the present invention;

A driving motor composed of a plurality of stator cores 20, coils 30, and bobbins 40, wherein a cooling water inlet 101 and an outlet 102 are formed in the stator core 20, and the cooling water inlet therein A cooling flow path 100 including a flow path 103 communicating with the 101 and the outlet 102 is formed, and the flow path 103 has a "U" shape, and the cooling water inlet 101 And the outlet 102 is characterized by having a structure in which the stator core 20 and the core 20 are connected to each other.

The water-cooled cooling apparatus and manufacturing method for an eco-friendly vehicle driving motor of the present invention can obtain the following effects.

First, when the heat generated from the stator coil of the motor is cooled by water cooling, a path through which cooling water can flow inside the core in which the coil is wound is created to reduce the heat transfer path and increase the heat transfer area to increase the cooling performance.

Second, by laminating one or more steel plate shapes in consideration of the cooling water flow path when stacking the core steel sheet to manufacture the core structure including the flow path through which the cooling water flows inside the core, the core is provided with the inlet and outlet of the cooling water and the inlet and the outlet. A flow path connecting the spaces is provided inside so that the cooling water can flow.

Third, since the motor is composed of a plurality of core slots, the cores including the cooling water flow path are connected to the cooling water flow path between adjacent cores so that the entire core can be cooled.

Fourth, by using the existing steel plate laminated core manufacturing method, it can be implemented by utilizing the existing core manufacturing process. In addition, by replacing the function of the existing cooler with a new core design while improving cooling performance, the motor size and weight Can be saved.

Fifth, it can be applied in various ways according to the structural shape of the core, and the shape of the inner channel of the core and the steel plate for forming it can also be applied in various ways according to motor characteristics and structures.

1 is a view showing a driving motor having a cooling structure in which a heat radiation fin is formed in a conventional motor housing.
2 is a view schematically showing a conventional water-cooled driving motor.
3 is a view showing a water-cooled cooling device for an eco-friendly vehicle driving motor according to an embodiment of the present invention
4 is a diagram illustrating a method for cooling the entire motor of the present invention.
5 is a view showing a state in which cores are stacked and manufactured according to an embodiment of the present invention.
6 is an exemplary diagram for making a core according to the present invention.
7 is a view schematically showing a method for cooling the entire drive motor using the core according to the present invention.
8 is a view showing a method in which a cooling water flow path connection between a core and an adjacent core according to the present invention is directly transmitted through the side of the core without installing it outside.
9 is a view schematically showing a method of providing a cooling water flow path therein while integrally manufacturing a plurality of core slots according to the present invention.
10 is a view showing four types of steel sheets for manufacturing the core according to the present invention.
Figure 11 (a) (b) is a view showing the core according to the present invention,
12 is a view showing a state in which a separate steel plate is stacked on one steel plate layer by supplementing a donut-shaped cooling water passage, as shown in FIG. 11.
13 is an exemplary view showing a state in which cooling water can be individually supplied to cores having a U-shaped flow path in the core according to the present invention.
14 is a view showing another embodiment of a method for manufacturing an eco-friendly vehicle driving motor of the present invention.
15 is a view showing another embodiment of a method for manufacturing an eco-friendly vehicle driving motor of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, terms or words used in the present specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor appropriately defines the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention eco-friendly vehicle driving motor water-cooled cooling device, as shown in FIG. 3, basically consists of a plurality of stator cores 20, coils 30, and bobbins 40, and the stator core 20 A cooling water inlet 101 and an outlet 102 are formed, and a cooling passage 100 including a passage 103 communicating with the cooling water inlet 101 and the outlet 102 is formed therein.

That is, the above structure provides a novel stator core 20 having a U-shaped flow path 103 when viewed in an axial cross section as shown in FIG. 3.

The above structure can shorten the length of the heat transfer path from the coil 30, which is the heating part, to the cooling water, and thus increase the heat conduction area according to the cross-sectional area and shape of the internal cooling water flow path.

4 is a diagram illustrating a method for cooling the entire motor of the present invention, the cooling water inlet 101 and the outlet formed in each core 20 from the cooling water inlet 101 receiving cooling water from the outside of the drive motor 102) was connected to each other to allow the cooling water to pass, and then discharged through the cooling water outlet 102.

At this time, the cooling water inlet 101 and the outlet 102 have a structure in which the stator core 20 and the core 20 are interconnected.

In addition, FIG. 5 is a view showing an embodiment of a method for manufacturing a driving motor according to the present invention, and the core 20 is manufactured by laminating thin steel plates, and has a shape as shown in FIGS. 5A and 5B. It was produced by laminating steel sheets.

In more detail, as shown in Fig. 6, in order to manufacture the flow path 103 having a "U" shape inside the core 20, as shown in Fig. 7 (a) (b) (c) , Each of the steel sheets can be pressed and laminated according to the cross-sectional length of FIG. 6B.

That is, the (a) core of FIG. 7 is stacked by the length ① of the cross section of FIG. 6 (b), the core (b) of FIG. 7 is stacked by the next length ②, and (c) of FIG. 7 by the next length ③. While completing the core by repeatedly stacking the cores, it is possible to fabricate a core having a square cross-sectional area of the cooling water passage inside the core as shown in FIG. 6B.

The method of manufacturing a core by the above method can be implemented by partially cutting out some of the steel plates without significantly changing the shape of the existing core steel plate, and Figs. 7(b) and (c) are applied to the existing steel plate as shown in Fig. 7(a). ), it can be manufactured by having two additional processed steel plates.

In addition, the shape of the inner core flow path 103 may be varied according to cooling performance, motor structure and characteristics, etc., and several core steel plates may be manufactured accordingly and stacked in order.

FIG. 8 is a schematic diagram of a method of cooling the entire motor by making the core manufactured as shown in FIG. 7 in communication so that cooling water can enter and circulate in the circumferential direction, and communicate with the flow path 103 formed inside the stator core 20 Thus, a separate cooling flow path 100 is formed outside to allow cooling water to flow.

At this time, as shown in (b) or (d) of FIG. 8, the entire vehicle is cooled by installing an inlet 101 through which coolant flows in and an outlet 102 through which cooling water flows from the outside of the motor in the adjacent core 20 It was made to be able to interwork with the system.

9 shows a water-cooled cooling method for an eco-friendly vehicle driving motor according to the present invention, and is a method in which the cooling water passage connection between adjacent cores is not installed outside, but is directly transmitted through the side of the mating core. It is one of the ways to further increase the cooling performance because it is possible to form a longer flow path inside the core while minimizing the components related to the cooling water flow outside the core.

10 is a method of providing a cooling water flow path therein while manufacturing a plurality of core slots integrally,

When the core is integrally manufactured, a cooling water flow path may be formed in the integral nose as shown in FIG. 10B, and four types of steel plates shown in FIG. 11 may be used to stack in this manner.

That is, it can be implemented by stacking steel plates in the order of (a)→(b)→(c)→(d)→(a).

At this time, in the case of forming a simple donut-shaped cooling water flow path, it is possible to manufacture two types of steel plate combinations as shown in Fig. 12(a). In this case, as shown in Fig. 12(b), two separate steel plate layers Structural robustness must be ensured even after lamination according to the position of the steel plate.

In this case, it is possible to improve the problem of laminating a separate steel plate on one steel plate layer by supplementing the donut-shaped cooling water flow path 100 as shown in FIG. 13.

14 is a view showing another embodiment of the method for manufacturing an eco-friendly vehicle driving motor of the present invention. In the former embodiments, the cooling water introduced into the motor passes through the entire core and is finally discharged to the outside of the motor. In this method, cooling water can be supplied individually to the cores having a U-shaped inner flow path. At this time, the motor coolant inlet line () is connected to the coolant inlet of the entire core, and the motor coolant discharge line is connected to the coolant outlet of the entire core.

In this case, there is an advantage in that cooling water of the same temperature can be supplied to the entire core.

15 is a view showing another embodiment of the present invention, as shown in (a), since the core 20 is made of a stack of steel sheets, the cooling water in the cooling water passage 103 inside the core 20 leaks Should not be.

To this end, when the steel sheets of the core 20 are laminated, airtightness is maintained with sufficient pressure and the use of an adhesive, so that the cooling water can be directly flowed into the core inner flow path 103.

In addition, the integrated flow path 103 may be inserted as shown in FIG. 15(b) so that it can be inserted into the inner space of the core 20 or separated by inserting the separated flow paths 103 as shown in FIG. 15(c). 15, (b), (c) may be inserted during the stacking process of the core or after completion of the stacking process.

In addition, a method of coating the wall surface of the inner channel space of the core 20 with a metal, polymer material, etc. may be used, which may be performed in the steel sheet processing step prior to core lamination, during the lamination process, or after the lamination process.

In the above, the members of the present invention are mostly composed of metal materials, but can be made of synthetic resin injection products if necessary, and some of their configurations may be different from the present invention at the time of manufacture, but the basic configuration should be interpreted as being included in the present invention. do.

And it should be understood that the above-described embodiments are illustrative in all respects and not limiting, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and the All changes and modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

20: core 30: coil
40: bobbin 100: cooling flow path
101: cooling water inlet 102: cooling water outlet
103: Euro

Claims (10)

In the water-cooled cooling device for an eco-friendly vehicle driving motor comprising a plurality of stator cores, coils, and bobbins,
The stator core has a cooling water inlet and an outlet, and a cooling flow path including a flow path is formed therein.
The method of claim 1,
The water-cooled cooling device for an eco-friendly vehicle driving motor, characterized in that the flow path has a "U" shape.
The method of claim 1,
The cooling flow path including the cooling water inlet and the outlet has a structure in which the stator core and the core are connected to each other.
A drive motor having a cooling water inlet and an outlet formed in a plurality of stator cores, a cooling passage including a passage connecting the inlet and the outlet therein, and receiving cooling water from the outside of the driving motor, respectively, from the cooling water inlet. A water-cooled cooling method for an eco-friendly vehicle driving motor, characterized in that the cooling water inlet and outlet formed on the stator core of are connected to each other to allow the coolant to pass and then discharge through the motor cooling water outlet to cool the entire motor.
The method of claim 4,
A water-cooled cooling method for an eco-friendly vehicle driving motor, characterized in that a separate cooling channel is formed outside so as to communicate with the channel formed inside the stator core to allow cooling water to flow.
The method of claim 4,
An eco-friendly vehicle driving motor water-cooled cooling method, characterized in that after coating the inside of the cooling channel, cooling water is flowed.
The method of claim 4,
A water-cooled cooling method for an eco-friendly vehicle driving motor, characterized in that the cooling water flows directly through a cooling channel formed inside the stator core.
The method of claim 4,
An eco-friendly vehicle driving motor water-cooled cooling method, characterized in that it can be cooled in a water-cooled, oil-cooled, or air-cooled manner by using a stator core having a cooling channel formed therein.
In forming the inside of the stator core of the vehicle drive motor,
A cooling water inlet through which cooling water is introduced from the outside and an outlet through which the heat-exchanged cooling water is discharged to the outside are formed, and electrical steel sheets including a flow path formed between the inlet and the outlet are stacked in several layers to form a stator core. An eco-friendly vehicle driving motor manufacturing method, characterized in that.
The method of claim 9,
An eco-friendly vehicle old motor manufacturing method, characterized in that a cooling flow path is formed in the core, and the cooling water is connected to enter and circulate in the circumferential direction.

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