KR100921687B1 - Cooling structure for generator and electric motor - Google Patents

Abstract

PURPOSE: A cooling structure of a generator and an electric motor is provided to obtain high heat conduction effect with compared with indirect heat conduction structure by using an insulating member as a heat transfer medium between the stator and the cooling cover. CONSTITUTION: In a generator and an electric motor, a cooling device is installed on a stator(200). The cooling device includes a cooling cover(300), and the cooling cover is installed along the circumference of the stator. A cooling water path(320) is formed inside the cooling cover, and an inlet for the cooling water is formed at the one side of the cooling cover. An outlet for the cooling water outlet(340) is formed at the other side of the cooling cover. An Insulating element(500) is installed at a gap of the cooling cover and the stator.

Description

COOLING STRUCTURE FOR GENERATOR AND ELECTRIC MOTOR}

The present invention relates to a water-cooled cooling structure of a generator or an electric motor. A generator having a separate heat transfer frame in the gap between the outer circumferential surface of the stator and the inner circumferential surface of the cooling cover can fill the gap to make the heat conduction between the stator and the cooling cover uniform and reliable. And a technology related to a cooling structure of an electric motor.

In general, a generator that generates electromotive force by electromagnetic induction and converts mechanical energy into electrical energy and a motor that generates mechanical driving force by using electrical energy basically has a cylindrical shape fixedly installed therein as shown in FIG. A stator, that is, a rotor installed inside the stator 200 and the stator, rotated by the rotor shaft 110, and induces power generation in the stator 200 during the rotation process, that is, a rotor ( 100).

Such a general generator or electric motor has a separate cooling structure in order to prevent overheating because the self-heating is generated as a whole, including the stator 200 during the power generation process between the rotor 100 and the stator 200.

 The cooling structure has a cylindrical cooling cover 300 is installed in a form surrounding the outer periphery of the stator 200, the cooling cover 300 inside the cooling water moving path 320 is formed,

As the outer circumferential surface of the stator 200 comes into contact with the inner circumferential surface of the cooling cover 300 cooled by the coolant, heat is transferred between the cooling cover 300 and the stator 200 to cool the stator 200.

However, in order to couple the stator 200 to the inside of the cooling cover 300 in the manufacturing process, as shown in the drawing, the micro-gap (a) is inevitably formed between the outer circumferential surface of the stator 200 and the inner circumferential surface of the cooling cover 300.

Therefore, in this structure, the cooling process is not a direct contact between the stator 200 and the cooling cover 300, the heat exchange is made in an indirect contact method through the air layer in the gap (a).

Therefore, as compared with the direct contact structure between the stator 200 and the cooling cover 300, the cooling efficiency is reduced, as well as the stator 200 is shaken due to the vibration generated during the rotation process of the rotor, thereby expanding the angle of [FIG. 1B] As can be seen in the figure, as the gap (a) is locally narrowed, cooling points may not be uniformly distributed, and a certain point may overheat.

The present invention has been proposed to solve the problems of the conventional cooling structure as described above,

It is an object of the present invention to provide a cooling structure of a generator and a motor that can increase heat transfer efficiency as compared with an indirect heat transfer structure through an air layer in a gap between a stator and a cooling cover.

In addition, the object of the present invention is to provide a cooling structure of a generator and a motor in which a cooling point is uniformly distributed over the outer circumference of the stator by preventing local contact between the stator and the cooling cover due to the vibration generated during the rotation of the rotor.

The present invention proposed to achieve the above object,

In the cooling structure of the generator and the motor provided with a cooling device on the stator,

The cooling device is installed along the outer circumference of the stator includes a cooling cover formed with a cooling water moving path therein,

In the gap between the cooling cover and the stator is characterized in that a separate heat transfer member is further installed.

In addition, the heat transfer member is made of a metal powder is characterized in that it is made of a form filled in the gap between the cooling cover and the stator.

In addition, the cooling water moving path is provided with a plurality of moving paths having independent sections along the circumference of the cooling cover, characterized in that the cooling water inlet and outlet are provided at each end of each cooling water moving path.

In addition, the heat transfer member is characterized in that the metal powder is made of any one of the points made of a frame or pipe form and brass, copper, tin.

The present invention consisting of the above characteristic configuration,

As the gap between the stator and cooling cover is filled with a separate heat transfer member,

Since the heat transfer member serves as a heat transfer medium between the stator and the cooling cover, there is an advantage that a high heat transfer effect can be obtained compared to the indirect heat transfer structure through the existing air layer.

In addition, local contact between the stator and the cooling cover due to vibration is prevented, and as the inner circumferential surface of the heat transfer member contacts the entire outer circumferential surface of the stator and the inner circumferential surface of the cooling cover, uniform cooling can be achieved over the entire outer circumference of the stator. There is an advantage.

Hereinafter, with reference to the configuration illustrated in the drawings will be described embodiments of the specific configuration and its operation of the present invention.

Cooling structure of the generator and the motor of the present invention is a cooling cover 300 and the heat transfer member in the basic structure of the generator or the motor consisting of the rotor 100 and the stator 200 as shown in FIG. 500) is added.

First, the core structure of the general generator and the electric motor will be described, and the stator 200 is formed to surround the outside of the rotor 100 schematically.

In addition to the stator 200, the rotor shaft 110 for power generation, that is, the rotor shaft 110 is penetrated through the center.

The rotor 100 is manufactured in a form in which a plurality of cores in the form of a circular thin plate are overlapped and fixed to each other through bolts (not shown).

For reference, each core is insulated and coated on the surface to prevent current flow between each core when overlapping, so as to prevent loss due to eddy current eddy current, unlike a rotor manufactured as a whole.

And the magnet 120 for the magnetic reaction with the stator 200 is embedded on the outer periphery of the rotor (100).

The rotor structure in the present invention can be selected in various ways from among various structures known to be not essential.

In addition to the rotor 100, the stator, that is, the stator 200, which is a core structure for generating power, is positioned in a cylindrical shape surrounding the outside of the rotor 100.

Since the stator 200 of the present invention uses a known one, a description of the coil structure and other basic structures will be omitted.

The stator 200 is provided with cooling means 1000 to prevent overheating of the generator and the motor.

The cooling means 1000 is largely composed of a cooling cover 300 and the heat transfer member 500.

First, the cooling cover 300 is for accommodating the cooling water and is formed in a cylindrical shape as a whole and surrounds the outer circumference of the stator 200, and has a double wall structure in which the outer wall 310a and the inner wall 310b are spaced apart from each other. .

 In the space portion between the outer wall 310a and the inner wall 310b, the diaphragms 350 are disposed along the circumference at intervals so that the diaphragm is divided into several spaces.

At this time, as shown in FIG. 2b, some of each of the diaphragms 350 is fixed to the rear of the cooling cover 300, and the front end is installed in a form spaced apart from the front of the cooling cover 300, and the other diaphragms are opposite thereto. Is installed as a structure.

As the diaphragms 350 of the opposite structure are alternately arranged, a coolant movement path 320 in zigzag communication is formed between the diaphragms 350.

In addition, a cooling water inlet 330 is provided at one side of the cooling cover 300 to cool the liquid into the cooling water moving path 320, and at a point away from the cooling water inlet 330, heat exchange is performed in the cooling water moving path 320. Cooling water discharge port 340 for discharging the coolant is provided.

As the pair of coolant inlets 330 and outlets 340 are repeatedly arranged along the outer circumference of the cooling cover 300 as shown in the drawing, the coolant movement paths 320a and 320b of the independent sections are respectively provided in the cooling cover 300. ) 320c and 320d are formed.

As the coolant moving paths 320a, 320b, 320c, and 320d are formed in the independent section as described above, the moving distance of the coolant is shortened, and thus the cooling efficiency is increased by shortening each cooling water circulation cycle.

The stator 200 is inserted into the cooling cover 300. In the related art, the gap a between the stator 200 and the cooling cover 300 is formed to be as narrow as possible, thereby preventing mutual heat transfer efficiency from deteriorating. Difficult to manufacture and assemble.

However, in the present invention, the assembly is smoothly made by making the gap a between the cooling cover 300 and the stator 200 sufficiently wide as compared with the related art. Of course, in this state, since the air layer is wider, the heat transfer efficiency is inevitably inferior.

However, in the present invention to install a separate heat transfer member 500 in the gap (a),

The heat transfer member 500 is to serve as a direct heat transfer medium between the cooling cover 300 and the stator 200, and is formed in a form in which fine metal powder is filled in the gap a.

The reason why the heat transfer member 500 is manufactured in powder form is that, if the heat transfer member 500 is manufactured in the form of a plate, the deformation of the heat transfer member may occur due to the vibration generated during the rotation of the rotor 100. Because there is.

Of course, the possibility of such a shape deformation is very insignificant, even if the shape change occurs because the heat transfer efficiency or device failure due to this is not a level of concern can be implemented in the form of metal plate as much as [Fig. 4].

In this case, the front and rear ends are inserted into the gap (a) to have a length that can be in close contact with the front and rear surfaces of the cooling cover 300, and have the same circular arc as the outer circumferential surface of the stator 200 and the inner wall of the cooling cover 300 as a whole. This prevents a gap from being formed when inserted into the gap a.

The heat transfer member 500 uses a relatively high thermal conductivity of brass, tin, copper, etc. of the metal, in particular, when using a brass, the content of zinc to determine the heat transfer efficiency is used more than 35%.

Of course, the material of the heat transfer member 500 is not limited to the three metals, any number of other metals can be selected.

The heat transfer member 500 is disposed at intervals along the circumference in the gap portion (a), wherein a separate partition frame 510 is provided between each heat transfer member 500 to prevent a collision between the heat transfer members 500. do.

In this case, the partition frame 510 may be implemented with a metal having high thermal conductivity, so that the partition frame 510 may have a heat conduction function together with the heat transfer member 500 as well as the collision prevention between the heat transfer members 500.

For reference, the heat transfer member 500 may be manufactured in a cylindrical shape instead of a plate shape as shown in FIG. In this case, the partition frame 510 does not need to be provided.

The following describes the operation of the present invention and the effects in the process through this configuration.

As shown in FIG. 2A, when the rotor 100 is rotated by the rotor shaft 110, a reaction due to the magnetic force between the magnetic members 120 and the stator 200 on the rotor 100 occurs and the process continues for the first time. The stator 200 generates heat and thereby heat is conducted throughout the cooling cover 300 including the heat transfer member 500.

At the same time, the cooling water is supplied into the cooling cover 300 through each cooling water inlet 330, and the supplied cooling water moves along the cooling water moving paths 320a, 320b, 320c, and 320d of each corresponding section. After being heat-exchanged with the cooling cover 300, the water is discharged to the outside through the cooling water outlet 340, and the process of supplying new cooling water again through the cooling water inlet 330 is repeated.

When the cooling cover 300 is cooled by the cooling water, the heat transfer members 500, which are in close contact with the inner wall of the cooling cover 300, are also heat exchanged and cooled, and the surface of the stator 200 is simultaneously cooled through the heat transfer members 500. do.

In this way, since the heat transfer between each other through the heat transfer member () in direct contact with the stator 200 and the cooling cover 300, it is possible to obtain a higher thermal conductivity than the indirect heat exchange structure through the air layer in the existing gap (a) do.

And as described above, since the heating member 500 fills the gap (a) between the stator 200 and the cooling cover 300, a phenomenon in which the gap at a specific point is narrowed during the rotation of the rotor 100 does not occur. Uniform heat conduction is always made throughout the outer circumference of the stator 200 and the outer circumference of the cooling cover 300.

The above-described features of the present invention may be variously modified and combined by those skilled in the art, but such modifications and combinations may be performed by adding a separate heat transfer member in the space between the stator and the cooling cover to make direct heat conduction through the heat transfer member. ,

In addition to obtaining a high heat exchange effect compared to the indirect heat conduction through the air layer in the existing gap, and if it is related to the configuration and the purpose that the uniform cooling can be always performed throughout the outer surface of the stator, it is within the protection scope of the present invention. Should be judged.

Figure 1a is a cross-sectional view showing a gap formed between the stator and the cooling cover in the prior art

Figure 1b is a cross-sectional view showing a state in which a specific point of the gap is narrowed during the rotation of the rotor in the prior art

Figure 2a is a cross-sectional view showing a state in which a metal powder-type heat transfer member is filled in the gap in the present invention

Figure 2b is a schematic plan view showing the structure of the cooling water flow path of the cooling cover

3 is a partially enlarged view of the installation structure of the cooling cover and the heat transfer member;

4 is a cross-sectional view showing a state in which the heat transfer member is implemented in a frame form.

5 is a cross-sectional view showing a state in which the heat transfer member is implemented in a pipe form.

<Description of the symbols for the main parts of the drawings>

  100: rotor 101: rotor shaft

  200: stator 300: cooling cover

  320: cooling water moving path 500: heat transfer member

  a: gap

Claims (4)

In a generator and a motor provided with a cooling device on the stator, The cooling device, It is installed along the outer circumference of the stator, the cooling water flow path is formed therein, and the cooling water inlet is formed at one side, and the cooling cover is formed at the other side. A separate heat transfer member is installed in the gap between the cooling cover and the stator so that the inner and outer peripheral surfaces of the heat transfer member are in close contact with the stator and the heat transfer frame, respectively. The heat transfer member is made of a metal powder generator and the motor, characterized in that formed in the gap filled between the cooling cover and the stator delete The method of claim 1, The metal powder is a generator and the motor, characterized in that made of any one material of brass, copper, tin The method according to claim 1 or 3, The cooling water movement path is provided with a plurality of movement paths having independent sections along the circumference of the cooling cover, the generator and the motor, characterized in that the cooling water inlet and outlet are respectively provided at both ends of the cooling water movement path

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