KR102069771B1 - Manufacturing method using current cut-core for current sensor - Google Patents

Abstract

The present invention relates to a method for manufacturing a current sensor using a wound cut core. More specifically, provided is the method for manufacturing a current sensor formed by winding a material in a wound manner, which is formed by winding a coated material through a coating module in a multi-layer laminated form through a jig for wound, placing the cut material on a cut core included in a cutting module, and then cutting and manufacturing a current sensor using a wound cut core. To this end, the method comprises: a coating step for forming a coating layer on a material for forming a current sensor; a wound step of laminating the material on which the coating layer is formed in multiple layers on the wound core; and a cutting step for processing a gap through a cutter on the material laminated in multiple layers.

Description

Manufacturing method using current cut-core for current sensor

The present invention relates to a method of manufacturing a current sensor using a wound cut core, and more particularly, to provide a method of manufacturing a current sensor formed in a wound manner by winding a material, which is obtained by winding a coated material through a coating module. The present invention relates to a method of manufacturing a current sensor using a wound cut core, which is wound by forming a multi-layer stack through a jig and then placed on a cut core included in a cutting module and cutting the wound core.

In general, current sensors having a ring-shaped coater, a magnetic gap formed by cutting and opening a portion of the core, and a hall element disposed in the magnetic gap are known. have. For example, the core and the hall element are accommodated in an accommodating part that is open to an upper side of a box body, and the inner part of the accommodating part is filled with a sealant of a synthetic resin material. The core and the hole element are sealed by hardening of such a sealing material.

The current flowing in the current sensor to an electrically conductive member inserted into the ring-shaped core is detected by a Hall element disposed in a magnetic gap. That is, magnetic flux is generated in the core by the current flowing to the electrically conductive member, and the Hall element generates a voltage (hall voltage) due to the Hall effect corresponding to the magnetic flux. The Hall voltage generated by the Hall element not only corresponds to the magnetic flux of the core, but also corresponds to the current flowing to the electrically conductive member for generating the magnetic flux. Therefore, the hall voltage is referred to as a detecting signal of an electric current value.

In this relationship, for example, the current sensor is used to detect a current flowing through an electrically conductive member (bus bar) for connecting a battery mounted on a vehicle and an electrical component mounted on the vehicle.

In the conventional method for manufacturing the above-described current sensor, a core and a hall element are attached to the receiving portion. Next, the inside of the accommodating part is filled with a liquid or a sealing material by flowing or dropping the sealing material in the form of a liquid or gel having flowability to the accommodating part. Thereafter, the core and the hall element are sealed and fixed to the accommodation part in a state in which the coater and the hole elements are positioned in the accommodation part by curing the sealant.

Wherein the magnetic gap of the core is formed by cutting and opening a portion of the core. As a result, stress generated by hardening of the seal is applied to the core, the ring-shaped core is deformed, and the dimension and shape of the magnetic gap are changed from a set value. Therefore, there is a problem that the accuracy and sensitivity of the current detection using the Hall element is lowered.

Moreover, when a thermosetting sealing material is used, a large stress is generated at the time of thermosetting of a sealing material by the linear expansion coefficient of such a sealing material. Therefore, this stress causes the core to deform easily.

In addition, in order to prevent deformation of the core caused by hardening of the sealing material, a sealing material having a small stress generated at the time of curing may be used. However, since the price of such a sealing material is expensive, the manufacturing cost is increased, thereby producing a current sensor. There was a problem that the cost increases.

Korean Patent Laid-Open Publication No. 10-2017-0022408 is proposed as a conventional technique to solve this problem.

The prior art relates to a method of manufacturing a current sensor capable of reducing eddy current loss, comprising: manufacturing a core by winding multiple layers of ribbon-shaped steel sheets; Forming a gap at a predetermined position of the core; Etching one end and the other end of the opposing core with a gap therebetween to maintain electrical insulation between the steel sheets; And placing the hall sensor in the gap.

The prior art made as described above is configured to form multiple layers of windings of steel sheets in order to reduce the loss of eddy currents, and form gaps therein. It is described that it can be formed using polishing, diamond cutting, laser cutting, etc. in the forming process, but there is a problem in that the manufacturing failure rate is high because there is no means for preventing the wound steel sheet in the gap forming process.

(0001) Republic of Korea Patent Publication No. 10-2017-0022408

The present invention has been proposed to solve the above problems, a method of forming a gap through the cutting module after laminating a multi-layer on the jig for coating after coating a steel sheet which is a material for manufacturing a current sensor through a coating module The purpose of the present invention is to provide a method for manufacturing a current sensor using a wound cut core which improves the output accuracy of the current sensor by maintaining the properties of the steel sheet because no sticking phenomenon occurs between the steel sheets.

In order to achieve the above object, the present invention provides a coating step for forming a coating layer on a material for forming a current sensor, a wound step of laminating a material on which a coating layer is formed on a wound core in multiple layers, and It characterized in that it comprises a cutting step of processing the gap through the cutter to the material.

In addition, the coating step, a drive motor, a drive roller connected to the drive motor and one end of the material is coupled to rotate to pull the material during rotation, disposed in a direction opposite to the drive roller and the material is wound A base frame on which a driven roller is disposed, a tension adjusting unit for adjusting the tension of the material discharged from the driven roller, a coating tank in which the material is immersed and a coating liquid is received, and a coating roller disposed in the coating tank. And a coating part and a drying part for drying the coating layer formed on the outer surface of the material, wherein the coating part is provided with a coating thickness adjusting part for adjusting the thickness of the coating liquid applied to the material to form a coating layer having a predetermined thickness on the outer surface of the material. It is characterized by.

At this time, the coating thickness control unit is coupled to the upper side of the coating bath, the inlet hole is the coating object is introduced, the cover formed with a discharge hole for discharging the coating object coated with the coating liquid, and based on the discharge hole on the upper surface of the cover The pair is arranged symmetrically characterized in that it comprises a pair of coating blades for controlling the thickness of the coating liquid applied to the material.

In addition, the thickness adjusting portion, characterized in that the air curtain portion for further blocking the inflow of external air into the coating tank is further provided.

The drying unit may include a circulation motor that sucks outside air, a hot air that heats the sucked outside air to generate hot air, and an air knife that communicates with the hot air to discharge hot air at a predetermined pressure.

The tension adjusting unit may include a base, an upper plate disposed above the base, a plurality of vertical pillars disposed between the base and the upper plate, and a pair of pressing plates spaced apart from above and below the base. It is characterized in that it comprises a lifting means for elevating the position of any one of the compression plate.

In addition, the cutting step, the cutting driving means, the cutter connected to the cutting driving means and the debris and fly ash generated when the material and the cutter come into contact with each other and at the same time to remove the frictional heat generated when the material is in contact with the cutter. It characterized in that it comprises a coolant supply means for cooling.

The present invention made as described above is to maintain a constant tension during the movement of the material transported by the roll, and after coating the coating solution by immersing the material in the coating bath in which the coating liquid is stored, irregular thickness on the surface of the material during the immersion process The coating solution may be formed to have a uniform thickness through the thickness control unit, and in this process, the productivity of the coating layer may be improved by minimizing the defect of the coating layer by blocking the inflow of external air.

In addition, it is configured to adsorb and dry the coating liquid to the material through hot air generated by inhaling the outside air and heating, thereby obtaining an effect of producing a product having a coating layer having a uniform thickness.

In addition, by first forming a coating layer on the material and then going through the winding and cutting steps, the material laminated in multiple layers has an advantage of improving the characteristics by removing mutual sticking phenomenon and reducing eddy current loss.

This solves the problem that the yield was low as 30-40% in manufacturing the current sensor molded by the conventional press punching method, and in particular, the current sensor formed of materials such as nickel-permalloy, cobalt, etc. It solved the problem that the property was reduced due to sticking with adjacent materials.

1 is a flow chart illustrating a method of manufacturing a current sensor using a wound cut core according to the present invention.
Figure 2 is an exemplary view showing an embodiment of implementing a current sensor manufacturing method using a wound cut core according to the present invention.
3 is an exemplary view showing a coating module according to the present invention.
4 is an exemplary view showing a tension control unit in the coating module according to the present invention.
5 is an exemplary view showing an operating state of the tension adjusting unit according to the present invention.
6 is an exemplary view showing a thickness control unit according to the present invention.
7 is an exemplary view showing a drying unit according to the present invention.
8 illustrates an example of a pound core in accordance with the present invention.
9 is an exemplary view showing a cutting core according to the present invention.

Hereinafter, other objects and features of the present invention in addition to the above object will become apparent through the description of the embodiments with reference to the accompanying drawings.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the current sensor manufacturing method using a wound cut core according to the present invention.

First, the current sensor manufacturing method (1) using the wound cut core according to the present invention includes a coating step (S10), a wound step (S20), and a cutting step (S30).

The coating step (S10), as a step for forming a coating layer on the material for forming the current sensor, for this purpose, the base frame 10, the tension control unit 20, the coating unit 30, the thickness control The part 40 and the drying part 50 are realized.

The base frame 10 is formed by connecting a plurality of plates and posts to each other, the cloudable caster is disposed on a portion in contact with the ground can be formed to be movable.

The base frame 10 is disposed with a driving motor 11 that is operated by a power and a signal applied to one side, the driving roller 12 is rotated by receiving the driving force of the driving motor 11 is disposed. Then, the driven roller 13 in which the material S is wound is disposed in a direction opposite to the drive roller 12.

Here, the driven roller 13 is disposed to be rotatable by the moving force of the material S moving by the operation of the driving roller 12, and through this, the material S of the material S drawn from the driven roller 13 is removed. The tension is maintained by the rotational force of the drive roller 12.

In addition, a plurality of auxiliary rollers 14 for changing the conveying direction of the material S to be conveyed may be disposed in the base frame 10.

The tension control unit 20 is for maintaining the tension of the moving material (S), the tension of the material in accordance with the distance or the position (height) disposed between the drive roller 12 and the driven roller (13) This is to prevent it from being maintained.

To this end, the tension adjusting unit 20 includes a base 21, a top plate 22 disposed above the base 21, and a plurality of vertical pillars disposed between the base 21 and the top plate 22. (23), a pair of crimping plates (24) disposed above the base (21), and elevating means (25) for elevating any one of the crimping plates (24).

The base 21 is formed in a flat plate shape and is disposed on the base frame 10, which is coupled to the base frame 10 so as to be interchangeable in correspondence to the left and right widths of the material S.

The upper plate 22 is formed in the shape and size corresponding to the shape and size of the base 21 is disposed above the base 21,

The vertical column 23 is disposed at a plurality of spaced apart positions between the base 21 and the top plate 22 to form a space between the base 21 and the top plate 22.

The pressing plate 24 is a pair of mutually symmetrically arranged above the base 21 to move the material (S) therebetween, rubber, urethane or soft synthetic resin material and the like so as not to damage the contact material (S) It is preferable to consist of the same soft material.

In this case, the pressing plate 24 may be implemented as a pair of rollers that rotate by the moving force of the moving material (S).

The elevating means 25 is for elevating any one of the pair of pressing plate 24, because the distance between the pressing plate 24 is to be adjusted according to the thickness of the moving material (S).

In the present invention, varying the height of the pressing plate 24 disposed above the pair of pressing plates 24 will be described as an embodiment.

The elevating means 25 is a lifting plate 251 is coupled to the pressing plate 24 disposed upward from the pair of the pressing plate 24, and a plurality of the lifting plate 251 is disposed on the edge of the vertical plate An elevating block 252 fitted to the column 23 to be elevated, a fixing nut 253 disposed on an upper surface of the elevating plate 251, and a long bolt 254 screwed to the fixing nut 253. And a handle 255 for rotating the long bolt 254.

The lifting means 25 made as described above raises or lowers the height of the elevating plate 251 by rotating the handle of the operator, where the operation of the handle is a manual transmission of the operator or a power transmission connected to the separate motor and the motor. Automation via means (chain, gear, belt, etc.) is also possible.

Looking at the operating state of the tension adjusting unit 20 made as described above with reference to FIG.

The material moving by the rotation of the driving roller 12 passes between the pair of pressing plates 24, but the material (S) passes while contacting the pressing plate 24, the rotation of the driving roller 12 Resistant to the pulling force generated by this is formed and this resistance is to maintain the tension by preventing sagging of the material passed through the pressing plate (24).

At this time, by adjusting the interval between the pressing plate 24 according to the thickness of the material (S) it is possible to maintain the constant resistance and the resulting tension by moving the material in a state that the material (S) and the pressing plate 24 abuts. .

The coating unit 30 is to form a coating layer on the outer surface of the material by applying a coating liquid to the transferred material (S), the coating liquid is stored and the coating tank 31 to move the material (S), the coating tank And a coating roller 32 disposed inside 31 to support the material.

The coating tank 31 is disposed in the base frame 10 and has a shape of an enclosure having one side opened to allow the material to be introduced and discharged, but preferably, the material is introduced and discharged through the top of the opened top. A viewing window may be formed at a portion where the coating roller 32 is disposed or formed of a transparent material so as to check the inside thereof.

The coating roller 32 is to support the moving material and at the same time to change the direction of movement is not limited to the position and number shown in the figure can be implemented in a variety of positions and numbers, the movement force of the moving material It is preferably arranged to rotate by.

Here, the coating tank 31 is provided with a thickness adjusting portion 40 for adjusting the thickness of the coating layer formed on the outer surface of the material.

The thickness adjusting part 40 includes a cover 41 covering an open end of the coating tank 31, and a coating blade 44 disposed on an upper surface of the cover 41.

The cover 41 is detachably coupled to the open end of the coating tank 31, and the penetration hole 42 formed to penetrate through the material to move into the coating tank 31, and the coating liquid is coated with the material Discharge holes 43 discharged to the outside of the tank 31 are formed side by side in a spaced apart position.

The coating blades 44 are disposed to face each other with the discharge holes 43 interposed therebetween to filter the coating liquid applied to the surface of the material discharged through the discharge holes 43 by a predetermined thickness to obtain a uniform thickness. Form a coating layer.

Here, the coating blade 44 may move the material coated with the coating liquid in spaces spaced apart from each other, and the coating blade 44 may form a coating layer having a predetermined thickness by contacting and filtering the coated coating liquid of the material. have.

At this time, the coating blade 44 is made of a block shape extending up and down, but is preferably made of a wedge shape narrowing the end toward the discharge hole 43 side of the cover 41, the discharge hole 43 It is more preferable that the coating liquid, which is disposed adjacent to the upper end and filtered through the coating blade 44, falls into the coating tank 31 through the discharge hole.

On the other hand, the cover 41 is further provided with an air curtain portion 46 for preventing the introduction of external air and foreign matter contained therein into the coating tank 31, the air curtain portion 46 is Compressed air is connected to the stored air tank (not shown) to inject compressed air at a constant speed and pressure above the inlet hole 42 to block external air from entering the coating tank 31, and simultaneously Compressed air is sprayed on the outer surface of the material drawn into (42) to obtain the effect of shaking off moisture or foreign matter from the material.

The drying unit 50 is for drying the coating liquid applied to the material, a circulation motor 51 for sucking outside air, a hot air blower 52 for generating hot air by heating the sucked outside air, and the hot air blower 52. And an air knife 53 which discharges hot air generated in communication with the gas at a constant speed.

The circulation motor 51 is provided on one side of the base frame 10 to suck outside air while operating through an applied power and signal. Since the operation and driving relationship of the circulation motor 51 is well known, detailed description thereof will be omitted.

The hot air blower 52 receives the outside air sucked through the circulation motor 51 and heats it to a constant temperature. A heating means is provided therein, and the supplied outside air is supplied at a constant temperature while operating through an applied power and signal. Heat.

Here, the constant temperature is changeable according to the type of coating liquid and the thickness of the coating layer. For example, when the thickness of the coating layer is 2 mm or less, it is heated to a temperature of 60 to 80 ° C.

The air knife 53 discharges the heated air through the hot air to the outside, and an inlet 532 through which the hot air is introduced is formed, and the fixed body fixed to the base frame 10 through the fixing bracket 533 ( 531 and a moving body 534 which communicates with the fixed body 531 and has an outlet 535 through which hot air is discharged.

The movable body 534 is composed of a cover 536 and a nozzle (not shown) disposed inside the cover 536, and a displacement hole 537 extending in the longitudinal direction is formed in the cover 536. The nozzle is provided with a displacement screw 538 which is movably inserted into the displacement hole 537, and changes and changes the position of the movable body 534 according to tightening and releasing and moving of the displacement screw 538. Secure in position.

This is to adjust the distance between the outlet 535 and the material S formed in the mobile body 534, the type of the material (S) and the coating liquid, the thickness of the coating layer and the moving speed of the material (S), etc. By adjusting the position of the outlet 535 according to various conditions that interfere with the drying is to maximize the drying effect by the hot air discharged by adjusting the distance with the material (S).

The present invention made as described above, the material to be transported by the roll to maintain a constant tension, the coating liquid is immersed in the coating tank in which the coating liquid is stored after applying the coating liquid, irregular in the surface of the material during the immersion process The coating liquid attached to the thickness can be formed to have a uniform thickness through the thickness control unit, in this process there is an effect that can increase the productivity by blocking the inflow of external air to minimize the defect of the coating layer.

In addition, it is configured to adsorb and dry the coating liquid to the material through hot air generated by inhaling the outside air and heating, thereby obtaining an effect of producing a product having a coating layer having a uniform thickness.

In addition, by first forming a coating layer on the material and then going through the winding and cutting steps, the material laminated in multiple layers has an advantage of improving the characteristics by removing mutual sticking phenomenon and reducing eddy current loss.

This solves the problem that the yield was low as 30-40% in manufacturing the current sensor molded by the conventional press punching method, and in particular, the current sensor formed of materials such as nickel-permalloy, cobalt, etc. It solved the problem that the property was reduced due to sticking with adjacent materials.

Next, the wound step (S20) is to laminate the material in which the coating layer is formed through the coating step (S10) in a multi-layer, for this purpose, the material is laminated in the form of the pound core 60 and the material is wound And a winding unit 61 for winding the core 60.

The wound core 60 is formed in a form corresponding to the shape of the designed current sensor and is not limited to the form shown in the figure.

The wound core 60 is wound in a form in which materials are laminated in multiple layers through the winding unit 61, and the position is fixed through a separate fixing jig in order to maintain a fixed state during the winding operation. It is preferable to arrange | positioned as it is.

On the other hand, the winding unit 61 is to wrap the supplied material in the wound core 60, for this purpose it is movable through the winding driving means 611 and the winding driving means 611 It is composed of a winding module 612 is disposed, wherein the winding driving means 611 is made of a three-way (3way) driving means for moving the winding module 612 in the X-axis, Y-axis, Z-axis For example, it may be made of a gantry.

Next, the cutting step (S30) is for processing the gap in the material that is in the state wound around the core core 60, the step of processing the gap that is essentially present in the non-contact current sensor.

To this end, the cutting step S30 includes a cutting core 70, a cutting machine 71, and a cutting oil supply means 72.

The cutting core 70 receives and fixes the molded material S through the wound core 60, where a gap forming hole 70A for forming a gap required for the current sensor is formed.

The cutting core 70 and the gap forming hole () can be variously changed according to the shape of the current sensor to be manufactured, and is not limited to the form shown in the figure.

The cutter 71 forms a gap by cutting a part of the material S fixed to the cutting core 70, and is driven through the cutting driving means 711.

Here, the cutting machine 71 may be implemented in various forms such as a rotary grinder, a high voltage discharge, a diamond cutting machine, and the cutting means used in the present invention may be changed according to the type of material for forming the current sensor.

In the present invention, but the cutting means consisting of a grinder that rotates through the cutting driving means 711 is not limited thereto.

The cutting oil supply means 72 is generated by the friction between the cutter 71 and the material S while simultaneously cleaning the dust and fly ash generated in the process of the cutter 71 forming a gap in the material S. It is to cool the heat.

To this end, the coolant supply means 72 includes a cutting oil tank 721 in which cutting oil is stored, a cutting oil supply pump 722 for supplying pumped cutting oil, a cutting oil conveying pipe 723, and a cutting oil conveying pipe 723. Cutting oil discharge nozzle 724 provided in the.

The recycling unit 73 may further include a recycling unit 73 for recovering and reusing the discharged cutting oil. The recycling unit 73 may include a filter for filtering foreign substances such as debris of materials included during cutting. It includes a recovery pipe 731 for transferring the cutting oil passing through the cutting oil tank 721.

As described above, the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and drawings are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the embodiments described, and all the things that are equivalent to or equivalent to the scope of the claims as well as the claims below will belong to the scope of the invention. .

1: current sensor manufacturing method using the wound cut core according to the present invention
S10: coating step S20: pound step
S30: Cutting Step
10: base frame
11: drive motor 12: drive roller
13: driven roller 14: auxiliary roller
20: tension control unit
21: base 22: top plate
23: vertical column 24: crimp plate
25: lifting means
251: lifting plate 252: lifting block
253: fixing nut 254: long bolt
255 handle
30: coating part
31: coating tank 32: coating roller
40: thickness control
41: cover 42: hole
43: discharge hole 44: coating blade
45: fastening hole 46: air curtain portion
50: drying unit
51: circulation motor 52: hot air fan
53: air knife
531: fixture 532: entrance
533: fixing bracket 534: moving body
535: exit 536: cover
537: Displacement hole 538: Displacement screw
60: pound core
61: Wounding Unit
611: winding drive means 612: winding module
70: cutting core
71: cutting machine 72: cutting oil supply means
73: recycling unit
711: cutting driving means 721: cutting oil tank
722: Pump for coolant supply 723: Coolant feed line
724: discharge nozzle 731: recovery pipe
70A: Gap Molding Hole

Claims (7)

Coating step (S10) for forming a coating layer on the material for forming the current sensor;
A wound step (S20) of stacking a material having a coating layer on the wound core 60 in multiple layers;
Including a cutting step (S30) for processing the gap through the cutting machine 71 in a material laminated in a multi-layer,
The coating step (S10),
A drive motor 11 and a drive roller 12 connected to the drive motor 11 and coupled to one end of the material S to rotate to pull the material during rotation, and oppose the drive roller 12. A base frame 10 disposed in the direction and in which the driven roller 13 on which the material S is wound is disposed,
A tension adjusting unit 20 for adjusting the tension of the material discharged from the driven roller 13;
A coating part 30 including a coating bath 31 in which the material is immersed and a coating liquid is received, and a coating roller 32 disposed in the coating bath 31;
It includes a drying unit 50 for drying the coating layer formed on the outer surface of the material (S),
The coating part 30 is provided with a coating thickness adjusting part 40 for controlling the thickness of the coating liquid applied to the material, the wound cut core, characterized in that to form a coating layer of a predetermined thickness on the outer surface of the material (S) Current sensor manufacturing method using.
delete The method of claim 1, wherein the coating thickness adjusting portion 40,
A lid 41 coupled to an upper side of the coating tank 31 and having an inlet hole 42 through which a coating object is introduced, and a discharge hole 43 through which a coating object coated with a coating liquid is discharged;
Wound cut, characterized in that it comprises a pair of coating blades 44 are arranged symmetrically with respect to the discharge hole 43 on the upper surface of the cover 41 to adjust the thickness of the coating liquid applied to the material Method for manufacturing a current sensor using a core.
The method of claim 1, wherein the thickness control portion 40,
The current curtain manufacturing method using a wound cut core, characterized in that the air curtain portion 46 is further provided to block the outside air flows into the coating tank 31.
The method of claim 1, wherein the drying unit 50,
A circulation motor 51 for sucking outside air,
A hot air blower 52 for generating hot air by heating the sucked outside air,
The current sensor manufacturing method using a wound cut core, which is in communication with the hot air blower (52) comprises an air knife (53) for discharging hot air at a predetermined pressure.
According to claim 1, wherein the tension control unit 20,
With the base 21,
An upper plate 22 disposed above the base 21;
A plurality of vertical columns 23 disposed between the base 21 and the upper plate 22,
A pair of crimping plates 24 spaced up and down above the base 21,
Method for manufacturing a current sensor using a wound cut core, characterized in that it comprises a lifting means (25) for elevating the position of any one of the compression plate (24).
According to claim 1, The cutting step (S30),
Cutting driving means 711,
Cutting machine 71 connected to the cutting driving means 711 and
It characterized in that it comprises a cutting oil supply means 72 for removing the debris and fly ash generated when the cutter 71 and the material (S) abuts, and at the same time cool the frictional heat generated when the cutter and the material abuts Method for manufacturing a current sensor using a pound cut core.

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