KR20230174006A - High frequency induction heating device - Google Patents

Abstract

The high-frequency induction heater according to the present invention includes first and second lead blocks 110 and 120 through which high-frequency power is supplied; an induction coil unit 130 connected to the first and second lead blocks 110 and 120; The induction heater main body 100 includes a low-temperature induction heating unit 140 and a high-temperature induction heating unit 150 disposed at regular intervals on the induction coil unit 130.

Description

High frequency induction heater {HIGH FREQUENCY INDUCTION HEATING DEVICE}

The present invention relates to high frequency induction heaters. More specifically, the present invention relates to a high-frequency induction heater equipped with a low-temperature induction heating unit and a high-temperature induction heating unit used to bond stator cores, which are heating objects used in the laminated core manufacturing process of a motor, by inductively heating them in a laminated state.

In general, when performing heat bonding of a stator core, an induction coil or ceramic is placed around the entire outer circumference of the object to be heated, in most cases, to heat the entire outer circumference of the stator, which is the object to be heated.

For example, the rotor or stator of a motor is manufactured in the form of a laminated core. The laminated core, which is the object to be heated, is manufactured by stacking multiple lamina members formed by continuously forming electrical steel sheets using a press device. One lamina member to be stacked must be combined with the lamina members stacked below and above it, and a method of combining them is disclosed in Korean Patent No. 10-1811266.

In the prior art, a method of forming and stacking core sheets in a press mold using a so-called self-bonding electrical steel sheet coated with an adhesive layer and simultaneously heating the laminated cores to bond the core sheets to each other was proposed. I'm doing it.

In this way, the adhesive layer between the core sheets is heat-cured by heating in a press mold to obtain a laminated core in which the core sheets are adhered to each other, and the manufactured laminated core is cooled through a cooling process to ship the product.

In Korean Patent Publication No. 10-2021-0154779, laminated cores are stacked in a press mold, then the upper jig is combined with the lower jig while the laminated core is placed in the lower jig, and these jigs are transported through a conveyor to perform high-frequency induction heating. The technology to do so is disclosed. In this prior art, the induction heating method for the laminated core adopts a method of heating the stator core by inductively heating heating plates installed on the upper and lower sides of the stator core by an induction coil.

However, the prior art involves induction heating using heating plates installed on the top and bottom of the laminated core, so it takes a considerable amount of time to transfer heat to the entire inside of the laminated stator core, thereby reducing productivity.

In particular, in the prior art presented above, when heat bonding of the stator is performed by inductively heating a heated object such as a stator core, a method of heating the entire circumference of the heated object or the entire upper and lower surfaces of the heated object is adopted. Not only is it impossible to intensively heat a specific part of the object to be heated, but induction heating causes protruding structures, such as fastening pieces of the stator core, to burn or discolor, resulting in deformation of the product, increasing the defect rate and deteriorating the quality of the stator core. Problems with Shiki are pointed out.

Accordingly, the present inventors have developed a high-frequency induction heater that can improve the productivity and quality of the laminated stator core by efficiently performing heat bonding of the laminated stator core by intensively and quickly inductively heating the local area around the outer circumference of the object to be heated. I would like to make a suggestion.

The purpose of the present invention is to provide both a low-temperature induction heating unit and a high-temperature induction heating unit in the main body of the high-frequency induction heater, so as to heat the required specific local area of the laminated stator at a low temperature and at the same time heat the required concentrated heating local area at a high temperature. .

The above and other inherent objectives of the present invention can all be easily achieved by the present invention described below.

The high-frequency induction heater according to the present invention includes first and second reed blocks 110 and 120 through which high-frequency power is supplied; an induction coil unit 130 connected to the first and second lead blocks 110 and 120; The induction heater main body 100 includes a low-temperature induction heating unit 140 and a high-temperature induction heating unit 150 disposed at regular intervals on the induction coil unit 130.

The present invention can improve the quality of the stator core by reducing the defect rate by preventing deformation of the product by preventing deformation of the product by inducing low-temperature induction heating of specific required local areas of the laminated stator through a high-frequency induction heater of a new structure, as well as improving the quality of the stator core by heating the required localized areas at high temperature. By induction heating, the local area of the stator is intensively heated in close proximity, which not only achieves rapid induction heating but also improves induction heating efficiency.

In addition, the present invention has the effect of reducing manufacturing costs by making the induction heater body more robust and simplifying assembly to improve productivity.

1 is an overall perspective view of the main body of a high-frequency induction heater according to the present invention.
Figure 2 is an overall perspective view of the high-frequency induction heater main body according to the present invention viewed from the bottom.
Figure 3 is an exploded perspective view of the high-frequency induction heater main body according to the present invention.
Figure 4 is a side view of the high-frequency induction heater main body according to the present invention.
Figure 5 is a plan cross-sectional view of the main body of the high-frequency induction heater according to the present invention, taken along line A-A of Figure 4.
Figure 6 is an enlarged cross-sectional view of the low-temperature induction heating portion of the high-frequency induction heater main body according to the present invention.
Figure 7 is a plan cross-sectional view of the main body of the high-frequency induction heater according to the present invention, taken along line B - B of Figure 4.
Figure 8 is a partially enlarged view of Figure 7.
Figure 9 is an example view of the induction heater main body according to the present invention installed inside the induction heater enclosure.
Figure 10 is a plan cross-sectional view of Figure 10.

Figure 1 is an overall perspective view of the high-frequency induction heater main body according to the present invention, Figure 2 is an overall perspective view of the high-frequency induction heater main body according to the present invention viewed from the bottom, and Figure 3 is an exploded perspective view of the high-frequency induction heater main body according to the present invention. 4 is a side view of the high-frequency induction heater main body according to the present invention, Figure 5 is a plan cross-sectional view of the high-frequency induction heater main body according to the present invention, along the line A - A of Figure 4, and Figure 6 is a low temperature view of the high-frequency induction heater main body according to the present invention. FIG. 7 is an enlarged cross-sectional view of an excerpt of an induction heating unit, and FIG. 7 is a plan cross-sectional view of the main body of a high-frequency induction heater according to the present invention, which is a cross-sectional view taken along the line B - B of FIG. 4, and FIG. 8 is a partial enlarged view of FIG. 7.

The object to be heated presented in the present invention may be, for example, a stator core 200 used as a stator of a motor in which a plurality of lamina members are stacked, and the lamina members have an adhesive coating layer on the front and back surfaces of an electrical steel sheet. It is manufactured using so-called self-bonding steel sheets.

As shown in FIG. 5, the form of the stator core 200 is a plurality of slots 210 formed around the inner inner circumference of the center, and a fastening piece 220 formed with fastening holes protruding outward at regular intervals around the outer circumference. It may be provided in a form having or in various modified forms, and the fastening pieces 220 are expressed as three pieces at regular intervals, but it can also be applied to a stator core in which two or four fastening pieces 220 are formed.

Therefore, two, three, or four low-temperature induction heating units according to the present invention, which will be described later, can be placed on the induction heater main body at regular intervals, and induction heating is performed while the stator cores 200 are stacked.

The high-frequency induction heater according to the present invention includes first and second reed blocks 110 and 120 through which high-frequency power is supplied; an induction coil unit 130 connected to the first and second lead blocks 110 and 120; The induction heater main body 100 includes a low-temperature induction heating unit 140 and a high-temperature induction heating unit 150 disposed at regular intervals on the induction coil unit 130, wherein the induction heater main body 100 At the same time, the outer circumference of the fastening piece 220 of the laminated stator core 200, which is moved and inserted into the central insertion portion 100A by a jig (not shown), is inductively heated by the low-temperature induction heating unit 140. The local area around the outer circumference of the stacked stator core 200 is inductively heated by the high-temperature induction heating unit 150.

This induction heater main body 100 is made by inserting the laminated stator core 200, which has been transported in a fixed state by a separate fixing device (not shown), into the central insertion portion 100A of the induction heater main body 100, not shown. The stator core 200 supported by a support plate is heated by induction, or the induction heater body 100 is inserted into the induction heater enclosure 300 as shown in FIGS. 9 and 10 and placed in the induction heater enclosure 300. The stator core 200 can be inductively heated through the induction heater main body 100, and a detailed description thereof is provided in the following description.

The not shown fixing device for fixing the induction heater main body 100 may be various types of fixing devices made of synthetic resin that support the first and second lead blocks 110 and 120 and the low-temperature induction heating unit 140. It is desirable that all components constituting the induction heater main body 100 be made of copper, which allows for smooth electrical conduction.

High-frequency power can be supplied through high-frequency power supply terminals 110A and 120A installed on top of each of the first lead block 110 and the second lead block 120, and the first lead block 110 and the second lead block 120 2 A coolant inlet 111 and a coolant outlet 121 are formed on one upper side of each lead block 120, and a coolant passage hollow portion is formed inside each of the first lead block 110 and the second lead block 120 ( 11) (12), an insulating material (I) is disposed between the first lead block 110 and the second lead block 120, and the insulating material (I) is connected to the first lead block 110 and the second lead block 110. It can be combined and fixed with the lead block 120 using bolts or welding.

One end and the other end of the induction coil unit 130 are connected to one lower side of each of the first lead block 110 and the second lead block 120 by welding, etc., and the coolant inlet ( The coolant supplied through 111) passes through the coolant of the induction coil part 130, circulates through the hollow part 130A, and is discharged through the coolant outlet 121 of the second lead block 120, thereby heating the induction coil part 130. ) can be cooled.

The induction coil unit 130 is an induction coil in the form of a square pipe having a hollow portion 130A through which coolant passes, and the first to fourth coils 131 (131) in the following description constituting the induction coil unit 130 ( A coolant passage hollow portion 130A is formed in each of 132)(137)(138).

The induction coil unit 130 includes a first coil 131 connected to a lower side of the first lead block 110 and a second coil 132 connected to a lower side of the second lead block 120; A first fixing block 133 and a second fixing block 134 connected to other ends of the first coil 131 and the second coil 132; a third fixing block 135 and a fourth fixing block 136 electrically connected to the first fixing block 133 and the second fixing block 134; a third coil 137 and a fourth coil 138 connected to the third fixing block 135 and the fourth fixing block 136; It is configured to include; a fifth fixed block 139 and a sixth fixed block 139A connected to the third coil 137 and the fourth coil 138.

Therefore, the present invention includes the first to fourth coils (131) (132) (137) (138) and the first to sixth fixed blocks (133) (134) (135) (136) (139) (139A). By forming the induction coil part 130, it is possible to maintain rigidity by preventing deformation from external shock through a sturdy structure, and electrical conduction can be achieved with a simple assembly connection structure, while at the same time allowing the coolant to pass through the hollow part ( Manufacturing costs can be reduced by providing the first to fourth coils 131, 132, 137, and 138 with 130A).

Each of the first fixed block 133, the second fixed block 134, the third fixed block 135, the fourth fixed block 136, the fifth fixed block 139, and the sixth fixed block (139A) Inside, a hollow portion (S1) (S2) (S3) (S4) (S5) (S6) through which the coolant passes is formed, and the first coil 131, the second coil 132, and the third coil 137 are electrically connected. and the fourth coil 138.

The coolant outlet 133A installed on one side of the first fixing block 133 and the coolant inlet 135A installed on one side of the third fixing block 135 are connected to each other with a connecting hose H1 as shown in FIG. 10. , the coolant outlet 139' installed on one side of the fifth fixed block 139 and the coolant inlet 139A' installed on one side of the sixth fixed block 139A are connected to each other with a connecting hose H2, 4 The coolant inlet (136A) installed on one side of the fixing block 136 and the coolant outlet (134A) installed on one side of the second fixing block 134 are connected to each other with a connecting hose (H3) to allow coolant to pass through. 1 The coolant supplied through the coolant inlet 111 of the reed block 110 passes through the coolant of the induction coil unit 130 and circulates through the hollow portion 130A and flows through the coolant outlet 121 of the second reed block 120. The induction coil unit 130 and the first to sixth fixing blocks 133, 134, 135, 136, 139, and 139A, which are heated by being discharged through the air, can be cooled.

Therefore, the high temperature caused by induction heating can be heat exchanged according to the circulation of the cooling water, so that the induction coil unit 130, the first to sixth fixed blocks 133, 134, 135, 136, 139, 139A, etc. By preventing deformation or damage, it is possible to prevent a decrease in induction heating efficiency caused by the induction coil unit 130, as well as extend the lifespan of the induction coil unit 130, thereby obtaining economic benefits.

In the present invention, the low-temperature induction heating unit 140 is arranged at regular intervals on the induction coil unit 130, and the fastening piece 220 of the stator core 200 is positioned so that the fastening piece 220, which is vulnerable to heat, is This is to reduce the defect rate of the product by preventing the fastening piece 220 of the stator core 200 from burning or discoloring during induction heating by induction heating at a low temperature. Low-temperature induction heating is performed depending on the shape of the stator core 200. The number of installed units 140 can be increased or decreased, and the present invention describes the arrangement of three low-temperature induction heating units 140 on the induction coil unit 130 as an example.

The low-temperature induction heating unit 140 includes a first low-temperature induction heating unit 141 installed between the first fixed block 133 and the third fixed block 135; a second low-temperature induction heating unit 142 installed between the second fixing block 134 and the fourth fixing block 136; and a third low-temperature induction heating unit 143 installed between the fifth fixing block 139 and the sixth fixing block 139A.

In the following description, each component of the first to third low-temperature induction heating units 141, 142, and 143 has the same configuration, so the same symbols are used for the same parts.

The first to third low-temperature induction heating units 141, 142, and 143 each have first and second low-temperature induction heating blocks 43 and 44 installed with a cooling water inlet 41 and a cooling water outlet 42 installed on the outside, respectively. )class; a concave semicircular front conductor piece (45) integrally curved to the front inside of the first low-temperature induction heating block (43) and the second low-temperature induction heating block (43) and (44); a semicircular rear conductor piece (46) behind the front conductor piece (45); One end of the semicircular rear conductor piece 46 is formed integrally with the first low temperature induction heating block 43, and the other end of the semicircular rear conductor piece 46 is formed integrally with the second low temperature induction heating block 44. , a coolant passage hollow portion 40A formed between the front conductor piece 45 and the rear conductor piece 46 and between the rear conductor piece 46 and the first and second low-temperature induction heating blocks 43 and 44. It may be configured to communicate with the coolant inlet 41 and the coolant outlet 42, and the coolant passage hollow portion 40A is shown in an exposed state in FIGS. 1, 3, and 5, but the cover is not shown. You can prevent coolant leaks by covering it with a cover.

Accordingly, the fastening piece 220 of the stator core 200 is disposed close to the concave portion A where the front conductor piece 45 is formed, so that the fastening piece 220 can be inductively heated to a low temperature.

That is, when a high-frequency current is supplied to the induction coil unit 130 while the fastening piece 220 of the laminated stator core 200 is disposed close to the concave portion A where the front conductor piece 45 is formed, the front conductor piece 45 is formed. As alternating magnetic flux is generated in (45), an eddy current, which is an induced current, flows to the fastening piece 220. The applied induced current generates Joule heat by the eddy current, and the heat generated in this way causes the fastening piece 220 to be damaged in a short time. Heat treatment is performed by rapid heating, but in the present invention, a back electromotive force is generated by the semicircular rear conductor piece 46 disposed behind the front conductor piece 45, and the magnetic field lines generated from the front conductor piece 45 and the semicircular rear conductor piece ( Since the magnetic force lines generated from 46) cancel each other through mutual opposing action, it is possible to lower the induction heating temperature applied to the fastening piece 220, thereby eliminating the phenomenon of burning or discoloration of the fastening piece 220, which is vulnerable to heat. By preventing deformation of the product, the defect rate can be reduced and the quality of the stator core 200 can be improved.

For example, the high-frequency current supplied through the first coil 131 flows clockwise from the front conductor piece 45 through the first fixing block 133 and the first low-temperature induction heating block 43, and the front conductor piece ( The high-frequency current through 45) flows counterclockwise from the inner rear conductor piece 46 through the second low-temperature induction heating block 44 and is supplied to the third coil 137 through the second fixing block 135. The magnetic force lines generated from the front conductor piece 45 generate a back electromotive force in the opposite direction to the magnetic force line generated from the semicircular rear conductor piece 46 disposed at the rear, so that the opposing magnetic force lines cancel each other out, causing the front conductor piece 45 and The magnetic flux density generated between the fastening piece 220 is lowered to lower the induction heating efficiency, thereby lowering the heating temperature induced in the fastening piece 220.

In the drawing, D is the gap between the first low-temperature induction heating block 43 and the second fixed block 135.

The first and second low-temperature induction heating blocks 43 and 44 of the first to third low-temperature induction heating units 141, 142 and 143 of this configuration are cross-assembled with each other to form a first fixing block 133. ) and the third fixed block 135, the second fixed block 134 and the fourth fixed block 136, and the fifth fixed block 139 and the sixth fixed block 139A, respectively, The first fixing block 133 and the third fixing block 133 are fixed by inserting the fixing bolts B1 and B2 into the long holes 43' and 44' formed by drilling the first and second low-temperature induction heating blocks 43 and 44. Insert screw holes (P1) (P2) drilled in each of the block 135, the second fixing block 134, the fourth fixing block 136, the fifth fixing block 139, and the sixth fixing block 139A. It can be assembled by screwing it together.

Therefore, the first and second low-temperature induction heating blocks 43 and 44 can be moved forward and backward along the long holes 43' and 44' around the fixing bolts B1 and B2, as shown in FIG. 6. It can be presented so that the fastening piece 220 of the stator core 200 disposed in the concave portion A where the front conductor piece 45 is formed is close to or remote from the concave portion A. It can be variably adjusted.

The reason why the fastening piece 220 of the stator core 200 can be variably adjusted to be close to or remote from the concave part A is because the temperature at which the fastening piece 220 of the stator core 200 is inductively heated is In order to lower or significantly reduce the induction efficiency, the fastening piece 220 of the stator core 200 is disposed in the concave portion A where the front conductor piece 45 is formed corresponding to the protruding length of the fastening piece 220. This is to respond to the fact that it can be deployed nearby or remotely.

For example, when the fastening piece 220 of the stator core 200 is placed close to the concave portion where the front conductor piece 45 is formed, the electromagnetic wave generated from the front conductor piece 45 is generated in the semicircular rear conductor piece 46. It is shielded through mutual magnetic flux cancellation with electromagnetic waves to prevent inductive heating applied to the fastening piece 220, so that the temperature applied to the fastening piece 220 is almost non-existent, and the front conductor piece 45 is formed. When the fastening piece 220 of the stator core 200 is remotely placed at the entrance (A), the magnetic force lines generated from the front conductor piece 45 are canceled out with the magnetic force lines generated from the rear conductor piece 46, but Significantly low induction heating is achieved by the leakage magnetic flux generated through the distance between the conductor piece 45 and the fastening piece 220, so that the fastening piece 220 laminated at a low temperature by induction heating with low efficiency is achieved. Induction heating can be done.

In particular, as shown in Figure 6, in the present invention, a back electromotive force is generated by the semicircular rear conductor piece 46 disposed behind the front conductor piece 45, and the magnetic field lines generated from the front conductor piece 45 and the semicircular rear conductor piece 46 Since the magnetic force lines generated from each other cancel each other through mutual opposing action, the induction heating temperature applied to the fastening piece 220 can be lowered, and thus the temperature is significantly higher than the high temperature caused by induction heating by the high-temperature induction heating unit 150, which will be described later. The fastening piece 220 can be inductively heated at a low temperature.

Figure 9 is an exemplary view of the induction heater main body according to the present invention installed inside the induction heater enclosure, and Figure 10 is a plan cross-sectional view of Figure 10.

When using the induction heater main body 100 according to the present invention by installing an insert inside the induction heater housing 300, a handle (L) is welded to the upper part of the first and second low-temperature induction heating blocks 43 and 44 and protrudes upward. ) is protruded from the upper part of the induction heater enclosure 300 through the long hole of the induction heater enclosure 300 to move the handle (L) back and forth as shown in FIG. 6 to remove the front conductor piece ( The fastening piece 220 of the stator core 200 disposed in the concave portion (A) formed by 45) can be variably adjusted to be close to or remote from the concave portion (A), and the first and second low temperatures When moving the induction heating blocks 43 and 44, a space where the first and second low-temperature induction heating blocks 43 and 44 can be moved is secured even if the induction heater main body 100 is installed inside the induction heater enclosure 300. It can be.

In the above, when the fastening piece 220 of the stator core 200 disposed in the concave portion A where the front conductor piece 45 is formed is variably adjusted so as to be close to or remote from the concave portion, the front conductor not shown The temperature is checked by sensing a temperature sensor disposed near the concave portion (A) where the piece 45 is formed, and if the induction heating temperature is high, the fastening piece 220 of the stator core 200 is separated from the concave portion (A). It can be adjusted to be deployed remotely.

Meanwhile, an external coolant inlet 310 and a coolant outlet 320 are installed on one side of the induction heater enclosure 300, which is supplied and recovered by a compressor from an external coolant tank, and the coolant disposed inside the induction heater enclosure 300 The hose 330 is connected to the first lead block 110, the second lead block 120, the first fixing block 133 and the second fixing block 134, the third fixing block 135 and the fourth fixing block ( 136) and inside each of the fifth fixing block 139 and the sixth fixing block 139A, a coolant passage hollow part (S1) (S2) (S3) (S4) (S5) (S6) and an induction coil part (130) ) of the coolant passes through and communicates with the hollow part (130A) so that the coolant can circulate.

The high-temperature induction heating unit 150 disposed at regular intervals in the induction coil unit 130 according to the present invention is connected to the first to fourth coils 131, 132, 137, and 138, respectively. It may be composed of high-temperature induction heating units 151, 152, 153, and the first to third high-temperature induction heating units 151, 152) 153 include first to fourth coils 131. (132) (137) (138) It may be installed by inserting E-type cores (E1) (E2) (E3) into each.

In the present invention, the E-type core (E1) (E2) (E3) is divided into two and arranged in each of the first to fourth coils (131) (132) (137) (138). The number of arrangement of E-type cores (E1) (E2) (E3) can be reduced or increased.

The E-type cores (E1) (E2) (E3) are made of ferrite or amorphous metals, and when the frequency band of the supplied high-frequency power is high, the E-type core (E1) ( By providing E2) (E3) made of ferrite, eddy current loss is reduced in the high frequency band to increase magnetic flux density efficiency, and when induction heating is performed at a low frequency in the supplied frequency band, an E-type core made of amorphous metal ( By using E1) (E2) (E3), it is possible to increase the magnetic flux density efficiency in the low frequency band, and the E-type core (E1) (E2) (E3) is used in the first to fourth coils 131. )(132)(137)(138) can be provided by joining each of them with bolts or welding, not shown.

The E-type cores (E1) (E2) (E3) made of ferrite or amorphous metal are located on the outside of the first to fourth coils (131) (132) (137) (138) and the stator core (200), which is the object to be heated. By absorbing the magnetic force lines generated between peripheral parts, the induced magnetic field linking the stator core 200 is collected and induced intensively and quickly to the local area around the outer circumference of the stator core 200 to increase the efficiency of induction heating to a high temperature. do.

Accordingly, the magnetic force lines generated between the first to fourth coils 131, 132, 137, 138 and the outer circumference of the stator core 200 are E-type cores (E1) (E2) (E3) made of ferrite or amorphous material. ), the magnetic force lines are absorbed by the first to fourth coils 131, 132, 137, and 138 at the center, and the strong magnetic force lines are directed toward the local area around the outer circumference of the stator core 200 without losing the magnetic force lines to the outside. Since it can be bridged, the local part of the stator core 200 can be intensively and quickly inductively heated at a high temperature, and the magnetic field lines do not leak to the outside of the induction heater main body 100, so a leakage magnetic flux shielding effect can be expected. It is possible to prevent malfunction of external devices due to high frequencies.

As described above, the present invention provides induction heating and Induction heating of the outer circumference of the stator core 200, which requires high temperature, can be simultaneously performed.

It should be noted that the description of the invention described above is merely an example for understanding the invention and is not intended to define the scope of the invention. The scope of the present invention is defined by the appended claims, and it should be understood that any simple modification or change of the present invention within this scope falls within the scope of protection of the present invention.

100: Induction heater body 100A: Central insertion part
110, 120: first and second lead blocks
110A, 120A: High frequency power supply terminal
111: Coolant inlet 121: Coolant outlet
130: induction coil part 130A: hollow part through which coolant passes
131, 132, 137, 138: first to fourth coils
133, 134, 135, 136, 139, 139A: first to sixth fixed blocks
140: low temperature induction heating unit
41, 42: Coolant inlet and outlet
43, 44: first and second low temperature induction heating blocks
45, 46: Front, rear conductor piece A: Concave inlet
40A: Hollow part through which coolant passes
150: High temperature induction heating unit
E1, E2, E3: E-type core
200: stator core 220: fastening piece
300: Induction heater enclosure

Claims (5)

First and second lead blocks 110 and 120 through which high-frequency power is supplied; an induction coil unit 130 connected to the first and second lead blocks 110 and 120; The induction heater main body 100 includes a low-temperature induction heating unit 140 and a high-temperature induction heating unit 150 disposed at regular intervals on the induction coil unit 130, wherein the induction heater main body 100 The outer circumference of the fastening piece 220 of the laminated stator core 200 that is inserted into the central insertion portion 100A of is inductively heated by the low-temperature induction heating unit 140, and at the same time, the laminated stator core 200 A high-frequency induction heater characterized in that it is configured to inductively heat a local portion of the outer circumference by a high-temperature induction heating unit (150). The method of claim 1, wherein high frequency power can be supplied through high frequency power supply terminals (110A) (120A) installed at the top of each of the first lead block 110 and the second lead block 120, and the first lead block 110 and the second lead block 120 are connected to each other. A coolant inlet 111 and a coolant outlet 121 are formed on one upper side of each of the block 110 and the second lead block 120, and are formed inside each of the first lead block 110 and the second lead block 120. It has hollow parts (11) and (12) through which coolant passes, and is configured so that an insulating material (I) is placed between the first lead block (110) and the second lead block (120). The method of claim 1, wherein the induction coil unit 130 includes a first coil 131 connected to a lower side of the first lead block 110 and a second coil connected to a lower side of the second lead block 120. 132); A first fixing block 133 and a second fixing block 134 connected to other ends of the first coil 131 and the second coil 132; a third fixing block 135 and a fourth fixing block 136 electrically connected to the first fixing block 133 and the second fixing block 134; a third coil 137 and a fourth coil 138 connected to the third fixing block 135 and the fourth fixing block 136; A high-frequency induction heater comprising a fifth fixed block 139 and a sixth fixed block 139A connected to the third coil 137 and the fourth coil 138. The method of claim 1, wherein the low-temperature induction heating unit 140 includes a first low-temperature induction heating unit 141 installed between the first fixed block 133 and the third fixed block 135; a second low-temperature induction heating unit 142 installed between the second fixing block 134 and the fourth fixing block 136; And a third low-temperature induction heating unit 143 installed between the fifth fixing block 139 and the sixth fixing block 139A, wherein the first to third low-temperature induction heating units 141 (142)(143) first and second low-temperature induction heating blocks 43 and 44 each having a cooling water inlet 41 and a cooling water outlet 42 installed on the outside; a concave semicircular front conductor piece (45) integrally curved to the front inside of the first low-temperature induction heating block (43) and the second low-temperature induction heating block (43) and (44); a semicircular rear conductor piece (46) behind the front conductor piece (45); One end of the semicircular rear conductor piece 46 is formed integrally with the first low temperature induction heating block 43, and the other end of the semicircular rear conductor piece 46 is formed integrally with the second low temperature induction heating block 44. , a coolant passage hollow portion 40A formed between the front conductor piece 45 and the rear conductor piece 46 and between the rear conductor piece 46 and the first and second low-temperature induction heating blocks 43 and 44. A high-frequency induction heater characterized in that it is configured to communicate with the cooling water inlet (41) and the cooling water outlet (42). The method of claim 1, wherein the high-temperature induction heating unit 150 includes first to third high-temperature induction heating units 151, 152 in each of the first to fourth coils 131, 132, 137, and 138. (153), wherein the first to third high-temperature induction heating units (151) (152)) (153) are E-type in each of the first to fourth coils (131) (132) (137) (138). A high-frequency induction heater characterized in that it is installed by inserting cores (E1) (E2) (E3).

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