KR101959535B1 - Apparatus for measuring magnetic field of electrolytic steel sheet - Google Patents

Abstract

Provided is a magnetic measuring device for an electric steel sheet comprising: a frame capable of performing high-magnetic field measurement of a high-output electric steel sheet material more precisely and accurately wherein a specimen is inserted in the frame to measure a magnetism in order to cool a high temperature generated during measurement more rapidly; and a cooling part installed in the frame to dissipate heat generated inside the frame.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for measuring magnetic force of an electric steel sheet,

A measuring device for measuring the magnetic properties of an electric steel sheet is disclosed.

Generally, magnetic field (magnetic) measurement tests are conducted as a method of quality certification and assurance through evaluation of physical properties of electrical steel products. The magnetic field measurement test measures the electromagnetic characteristics of the electrical steel sheet products such as iron loss, magnetic flux density, permeability, magnetizing force and apparent power.

The test is carried out through a measuring device. The measuring device has a coil for magnetizing the specimen inside the frame. The measuring apparatus measures the electromagnetic characteristics by sequentially inserting a predetermined amount of specimen through the holes formed in the slopes of the frame.

Magnetic measurements on the specimen proceed along the magnetization curve and generally proceed in the 10000 A / m range. 2. Description of the Related Art In recent years, the development of high-output electric steel sheet materials such as driving motors for electric vehicles has been actively promoted, and thus there is a need for a high-field measuring apparatus for quality certification of such products.

In the conventional case, although the high magnetic field characteristic is tested using a general measuring device, it is difficult to measure the high magnetic field, and the reliability of the measurement is low and the reproducibility is not ensured due to the deviation and high heat generation problem in the measuring process. In addition, due to the high temperature, equipment failure frequently occurs and there are many difficulties due to fire risk.

Provided is an electric steel sheet magnetic measuring device capable of performing high-field measurement of a high-output electric steel sheet material more precisely and accurately.

Provided is an electric steel sheet magnetic measuring device capable of enhancing measurement stability of high magnetic field of a high output electric steel sheet material and increasing reliability of measurement data.

Provided is an electric steel sheet magnetic measuring device which can cool a high temperature generated in high magnetic field measurement of a high output electric steel sheet material more rapidly and prevent device damage due to high temperature and defective magnetic measurement.

The measurement apparatus of this embodiment may include a frame into which a sample is inserted and a magnetic property is measured, and a cooling unit installed in the frame to dissipate heat generated inside the frame.

The frame may include an upper case having a receiving space therein and having an insertion hole for inserting a specimen on a side thereof, a board disposed below the upper case, and a coil provided inside the upper case to magnetize the test piece.

The cooling unit may be configured to cool the coil by circulating and supplying the cooling fluid into the frame.

The cooling unit may include a supply unit connected to the frame and supplying the cooling fluid into the frame, and a circulation unit connected to the frame to discharge and circulate the cooling fluid supplied to the frame.

The supply section may include a first tank in which a cooling fluid is accommodated, and a supply pipe connected between the first tank and the frame and through which the cooling fluid is transferred.

Wherein the first tank is disposed at an upper portion of the frame and the supply pipe is connected between a lower end of the first tank and an upper portion of the upper case of the frame so that the cooling fluid accommodated in the first tank flows down into the frame through the supply pipe Lt; / RTI >

The supply pipe may be installed in a lower portion of the first tank and may have a funnel shape whose diameter gradually decreases toward the end, and may be installed in a hole formed in an upper case of the frame.

And an airtight O-ring may be further provided between the hole of the upper case and the supply pipe.

The circulation unit may include a second tank connected to the frame to receive the cooling fluid discharged from the frame, and a discharge pipe connected between the second tank and the frame to transfer the cooling fluid.

The circulation unit may further include a circulation pipe connected between the first tank and the second tank for transferring the cooling fluid and a transfer pump connected to the circulation pipe for transferring the cooling fluid in the second tank to the first tank have.

The circulation unit may further include a drain pipe installed at one side of the second tank to discharge the cooling fluid, and an open / close valve installed at the drain pipe.

Wherein the second tank is disposed below the frame and the discharge pipe is connected between the board and the upper portion of the second tank so that the cooling fluid flowing in the frame flows into the second tank through the discharge pipe .

The discharge pipe may be installed at a lower portion of the board of the frame and may have a funnel shape having a smaller diameter toward the end, and may be installed in a hole formed in the upper portion of the second tank.

And an airtight O-ring may be further provided between the discharge pipe and the hole of the second tank.

The second tank may have a relatively larger internal volume than the first tank.

The first tank and the supply pipe of the supply part and / or the second tank and the discharge pipe of the circulation part may be made of a material selected from a metal including copper.

The circulation pipe may be extended into the supply pipe and the discharge pipe.

The outlet cross sectional area of the supply pipe may be formed to be relatively larger than the outlet cross sectional area of the discharge pipe.

As described above, according to the present embodiment, it is possible to precisely and accurately perform high-field measurement on a high-output electric steel sheet material used in a driving motor for an electric automobile, etc. by rapid and uniform cooling by a cooling fluid, .

Thus, it is possible to reduce time and cost due to repetitive re-experiments

In addition, by improving the cooling efficiency, it is possible to prevent damage to the apparatus due to high temperature, increase the measurement safety, and ensure the reproducibility and reliability of the measurement results.

Therefore, it is possible to minimize the defect rate and improve the quality of the product by preventing defects in the production process of the high output electric steel sheet material product.

In addition, it will be possible to secure sales competitiveness of high output materials by quality certification and evaluation experiment of high magnetic steel sheet material through precise magnetic measurement and reliability assurance.

1 is a schematic exploded perspective view showing an apparatus for measuring an electrical steel sheet magnetic property according to this embodiment.
2 is a schematic perspective view showing an assembled state of the apparatus for measuring magnetic susceptibility according to the present embodiment.
3 is a schematic cross-sectional view of the apparatus for measuring magnetic susceptibility of the steel sheet according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, the present embodiment will be described by taking as an example a high field DC measuring device for evaluating the magnetic field of a multilayer winding coil applied to a drive motor for a high output electric vehicle. The present invention is not limited thereto and can be applied to magnetic field measuring devices of various materials.

FIG. 1 and FIG. 2 show the structure and the assembled state of the apparatus for measuring the magnetic steel sheet according to the present embodiment, respectively, and FIG. 3 shows the cross-sectional structure of the apparatus for measuring the magnetic steel sheet.

1, the measuring apparatus 100 of the present embodiment includes a frame 10 in which a sample is inserted and a magnetic property is measured, and heat generated in the frame 10, which is installed in the frame 10, And may include a cooling portion for radiating heat.

As described above, in the present embodiment, since the cooling unit is provided to dissipate the heat generated in the frame 10, it is possible to efficiently remove the high heat generated in the high magnetic measurement process.

The frame 10 includes an upper case 12 having a receiving space therein and an insertion hole 18 for inserting a specimen therein, a board 14 disposed below the upper case 12, A primary coil 15 provided inside the rotor 12 to magnetize the specimen to form a magnetic field, and a secondary coil 16.

The frame 10 is in the form of a square box. The upper case (12) and the bottom plate form the outer shape of the frame (10). An insertion hole 18 for inserting each corner side specimen of the upper case 12 is formed and a conduit through which the specimen passes is formed in the insertion hole 18 inside. Each channel extends along the sides of the frame 10 and communicates between the insertion holes 18 at the corners in the same axial direction. The primary coil 15 and the secondary coil 16 are wound around the outer circumferential surface of the duct in the inner space of the frame 10. The primary coil 15 is wound, for example 299 times, and the secondary coil 16 is wound 2520 times. An insulating tape is applied between the primary coil 15 and the secondary coil 16, and the wound coil is coated with enamel.

A larger magnetic field can be obtained as the number of windings of the secondary coil 16 is larger and the number of windings of the primary coil 15 is smaller. The higher the deviation of the number of windings of the primary coil 15 and the secondary coil 16, the higher the magnetic field is generated. The number of windings of the primary coil 15 and the secondary coil 16 can be adjusted according to the size of the magnetic field to be measured.

The frame 10 is a component in which a test piece is inserted through the insertion hole 18 to perform a test substantially. Since a number of techniques have already been disclosed for the structure of the frame 10, the detailed description of the structure will be omitted.

The cooling unit may be a structure for circulating cooling fluid into the frame 10 to cool the coil.

To this end, the cooling section of the present embodiment includes a supply section 30 connected to the frame 10 to supply a cooling fluid into the frame 10, and a supply section 30 connected to the frame 10 to discharge the cooling fluid supplied to the frame 10 And a circulation unit 50 for circulating the liquid.

The cooling fluid may be various fluids having a cooling effect on high temperature such as cooling water or cooling oil.

In this embodiment, the supply unit 30 and the circulation unit 50 can be arranged vertically with the frame 10 interposed therebetween. That is, the supply unit 30, the frame 10, and the circulation unit 50 are stacked and disposed in order from the top. The cooling fluid of the supply unit 30 flows downward by the potential energy and flows into the frame 10 without cooling the frame 10 and flows to the circulation unit 50 after cooling the frame 10, Can be discharged. As described above, the cooling fluid can be transferred through the frame 10 to cool the inside of the frame 10.

The supply section 30 may include a first tank 32 in which a cooling fluid is accommodated and a supply pipe 34 connected between the first tank 32 and the frame 10 to transport the cooling fluid.

The first tank 32 is a container structure having an internal space in which a cooling fluid is received. The shape and size of the first tank 32 can be variously modified depending on the size of the frame 10 and the like.

The cooling fluid in the first tank 32 can be forcedly fed through the supply pipe 34 by using external power and supplied to the inside of the frame 10. [

In this embodiment, the cooling fluid may be of a structure that transfers without any external power.

The first tank 32 is disposed above the frame 10 and the supply pipe 34 is connected between the lower end of the first tank 32 and the upper portion of the upper case 12 of the frame 10. [ Thus, the cooling fluid contained in the first tank 32 flows down by the height difference and is transported into the frame 10 through the supply pipe 34.

A hole 36 for connection with the supply pipe 34 is formed at the upper end of the upper case 12 of the frame 10.

In the present embodiment, the supply pipe 34 is tightly connected to the hole 36 by the weight of the supply unit 30. The supply pipe 34 is installed in the lower part of the first tank 32 and has a funnel shape with a smaller diameter toward the end so that the supply pipe 34 is inserted into the hole 36 formed in the upper case 12 of the frame 10 It is structured to be installed.

The lower end diameter of the supply pipe 34 is smaller than the diameter of the hole 36 formed in the upper case 12 and the upper end diameter of the supply pipe 34 is sufficiently larger than the diameter of the hole 36 of the upper case 12. [ 3, the supply pipe 34 is inserted into the hole 36 of the upper case 12 when the first tank 32 provided with the supply pipe 34 is placed on the frame 10, The side surface of the supply pipe 34 is in close contact with the hole 36 of the upper case 12. Thus, the supply pipe 34 is pressed by the weight of the first tank 32 and is in intimate contact with the hole 36. Thus, it is possible to prevent the cooling fluid from flowing out between the holes 36 and the supply pipe 34. An o-ring may be further provided between the supply pipe and the hole so as to maintain the airtightness when necessary.

The first tank 32 and / or the supply pipe 34 of the supply unit 30 may be made of a metal material having a high thermal conductivity. In this embodiment, the first tank 32 and / or the supply pipe 34 may be made of a copper material.

The first tank 32 and the supply pipe 34 are in contact with the outside air, so that the inside cooling fluid indirectly exchanges heat with the outside air. In the process of circulating the heat exchanged cooling fluid with the high temperature of the frame 10, the heat of the cooling fluid is quickly radiated to the outside through the first tank 32 and the supply pipe 34 made of copper to cool the cooling fluid .

The circulation part 50 is connected to the frame 10 to receive a cooling fluid discharged from the frame 10 and a second tank 52 connected to the frame 10 to be cooled And may include a discharge tube 54 through which the fluid is delivered.

The second tank 52 is a container structure having an internal space in which a cooling fluid is received. The shape and size of the second tank 52 can be variously modified. An opening / closing valve 58 is provided on one side of the second tank 52. The cooling fluid in the second tank 52 can be taken out to the outside by operating the on-off valve 58 if necessary.

In this embodiment, the second tank 52 may have a structure having a relatively larger internal volume than the first tank 32. The first tank 32 is disposed above the frame 10 so that the cooling fluid accommodated in the first tank 32 falls directly into the frame 10 so that it can be formed smaller than the second tank 32. [ It is possible to reduce the size of the first tank to further reduce the size of the entire apparatus and reduce the manufacturing cost.

The second tank 52 is disposed under the frame 10 and the discharge pipe 54 is connected between the board 14 of the frame 10 and the upper portion of the second tank 52. Thus, the cooling fluid heat-exchanged inside the frame 10 is flowed by the height difference and is transferred into the second tank 52 through the discharge pipe 54.

The discharge pipe 54 is installed under the board 14 of the frame 10. A hole 56 for connection with the discharge pipe 54 is formed in the upper portion of the second tank 52.

In this embodiment, the discharge pipe 54 is tightly connected to the hole 56 by its upper weight. For this purpose, the discharge pipe 54 is installed in the board 14 and has a funnel shape with a smaller diameter toward the end, and is fitted in the hole 56 formed in the upper portion of the second tank 52 .

The lower end diameter of the discharge pipe 54 is smaller than the diameter of the hole 56 formed in the second tank 52 and the upper end diameter of the discharge pipe 54 is sufficiently larger than the diameter of the hole 56 of the second tank 52. 3, the discharge pipe 54 is inserted into the hole 56 of the second tank 52, and the discharge pipe 54 is inserted into the hole 56 of the second tank 52. As a result, The side surface of the discharge pipe 54 is brought into close contact with the hole 56 of the second tank 52. Therefore, the discharge pipe 54 is pressed by the weight of the upper frame 10 and the supply part 30 to closely contact with the hole 56. [ Thus, it is possible to prevent the cooling fluid from flowing out between the holes 56 and the discharge pipe 54. If necessary, an o-ring may be further provided between the discharge pipe and the hole to maintain more airtightness.

The second tank 52 and / or the discharge pipe 54 of the circulation unit 50 may be made of a metal material having a high thermal conductivity. In this embodiment, the second tank 52 and / or the discharge pipe 54 may be made of a copper material.

The second tank 52 and the discharge pipe 54 are in contact with the outside air, so that the inside cooling fluid indirectly exchanges heat with the outside air. Thus, the heat of the cooling fluid is dissipated to the outside through the second tank 52 made of copper and the discharge pipe 54 in the process of circulating the heat exchanged cooling fluid with the high temperature of the frame 10, .

The circulation portion 50 of the present embodiment is connected to the circulation pipe 60 through which the cooling fluid is transferred between the first tank 32 and the second tank 52 and the circulation pipe 60, And a transfer pump 62 connected to the second tank 52 for transferring the cooling fluid in the second tank 52 to the first tank 32.

The cooling fluid flowing from the first tank 32 to the second tank 52 through the frame 10 is returned to the first tank 32 through the circulation pipe 60 by the transfer pump 62 And is continuously circulated.

The transfer pump 62 may be installed above the first tank 32. The lower end of the circulation pipe 60 extends to the inner bottom of the first tank 32 and the upper end extends to the upper portion of the first tank 32 and is connected to the transfer pump 62.

Thus, when the transfer pump 62 is driven, the cooling fluid in the second tank 52 is drawn up and sent to the first tank 32 again. Thus, the cooling fluid flows back to the frame 10 and continuously circulates.

In this embodiment, the circulation pipe 60 extends in the vertical direction through the inside of the supply pipe 34 and the discharge pipe 54, as shown in Fig. That is, the first tank 32, the frame 10, and the second tank 52 are sequentially arranged from the top, and the circulation pipe 60 is connected to the supply pipe 34 at the same position of the discharge pipe 54, (34) and the discharge pipe (54). Accordingly, the length of the circulation pipe (60) can be shortened to increase the cooling fluid circulation efficiency in the second tank (52). In addition, by using the holes 36 and 56 that are already formed without providing separate connecting ports between the first tank 32 and the second tank 52 for installing the circulation pipe 60, the apparatus configuration can be further simplified .

The outlet cross-sectional area of the supply pipe 34 may be formed to be relatively larger than the outlet cross-sectional area of the discharge pipe 54. The cross-sectional area of the exit means the cross-sectional area formed by the gap between the circulation pipe 60 and the exit end of the supply pipe 34 and the discharge pipe 54, and the area where the cooling fluid exits.

As described above, by controlling the outlet cross sectional area of the supply pipe 34 to be different from the outlet cross sectional area of the discharge pipe 54, it is possible to control the cooling fluid holding amount and the residence time within the frame 10.

The amount of the cooling fluid discharged from the frame 10 is smaller than the amount of the cooling fluid supplied into the frame 10 as the outlet cross sectional area of the supply pipe 34 is formed larger than the outlet cross sectional area of the discharge pipe 54. That is, the amount of the cooling fluid supplied to the frame 10 becomes larger than the amount of the cooling fluid discharged from the frame 10. [ Therefore, a certain amount of fluid can always be accumulated in the frame 10 without being exhausted. Thus, the cooling fluid is kept filled in the frame 10, and the residence time within the frame 10 is extended, so that even, uniform, and effective cooling can be performed throughout the frame 10.

The cooling fluid, which has been heat-exchanged with the inside of the frame 10, is discharged from the frame 10 to the second tank 52 through the discharge pipe 54. And circulated to the first tank 32 through the circulation pipe 60. In this process, the cooling fluid is heat-exchanged with the outside air through the second tank 52, the first tank 32, the discharge pipe 54, and the supply pipe 34,

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10: frame 12: upper case
14: board board 30:
32: first tank 34: supply pipe
36, 56: hole 50: circulation part
52: second tank 54: discharge pipe
58: opening / closing valve 60: circulation pipe
62: Feed pump

Claims (13)

An upper case having a receiving space therein and formed with an insertion hole for inserting a specimen, a board disposed below the upper case, and a coil provided inside the upper case to magnetize the specimen, Frame to measure; And
A cooling unit installed in the frame and radiating heat generated inside the frame,
/ RTI >
The cooling unit circulates and supplies a cooling fluid into the frame to cool the coil,
And the cooling fluid is kept filled in the frame.
delete The method according to claim 1,
Wherein the cooling unit includes a supply unit connected to the frame and supplying the cooling fluid to the inside of the frame, and a circulation unit connected to the frame and discharging and circulating the cooling fluid supplied to the frame. The method of claim 3,
Wherein the supply section includes a first tank in which a cooling fluid is accommodated, and a supply pipe connected between the first tank and the frame and through which the cooling fluid is transferred. 5. The method of claim 4,
Wherein the first tank is disposed at an upper portion of the frame and the supply pipe is connected between a lower end of the first tank and an upper portion of the upper case of the frame so that the cooling fluid accommodated in the first tank flows down into the frame through the supply pipe An electric steel sheet magnetic measuring device. 6. The method of claim 5,
Wherein the supply pipe is installed in a lower portion of the first tank and has a funnel shape with a smaller diameter toward the end, and is fitted in a hole formed in an upper case of the frame. 7. The method according to any one of claims 4 to 6,
Wherein the circulation unit includes a second tank connected to the frame to receive the cooling fluid discharged from the frame, and a discharge pipe connected between the second tank and the frame and through which the cooling fluid is transferred. 8. The method of claim 7,
The circulation unit includes a circulation pipe connected between the first tank and the second tank for transferring the cooling fluid and a transfer pump connected to the circulation pipe for transferring the cooling fluid in the second tank to the first tank Wherein the electric steel sheet magnetic measuring device comprises: 9. The method of claim 8,
Wherein the second tank is disposed below the frame and the discharge pipe is connected between the board and the upper portion of the second tank so that cooling fluid flowing in the frame flows down to the inside of the second tank through the discharge pipe, Steel plate magnetic measuring device. 10. The method of claim 9,
Wherein the discharge pipe is installed in a lower part of a board of the frame and has a funnel shape with a smaller diameter toward the end, and is fitted in a hole formed in the upper part of the second tank. 8. The method of claim 7,
Wherein the first tank and the supply pipe of the supply unit and the second tank and the discharge pipe of the circulation unit are made of a material selected from metals including copper. 9. The method of claim 8,
Wherein the circulation pipe extends along the inside of the supply pipe and the discharge pipe. 8. The method of claim 7,
Wherein the outlet cross-sectional area of the supply pipe is formed larger than the outlet cross-sectional area of the discharge pipe.

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