Heat fusion-type core heating device

Abstract

An embodiment of the present invention may provide a heat fusion-type core heating device comprising: a jig including a lower jig for supporting a core in which steel plates are stacked, and an upper jig for pressing the core; a first electrode in contact with at least a portion of one surface of the core formed by stacking the steel plates; a second electrode in contact with at least a portion of the other surface of the core formed by stacking the steel plates; and a power supply device for supplying power to the core by using the first electrode and the second electrode.

Description

Thermal fusion type core heating device

[0001] The present invention relates to a heat-fusion type core heating device, and more specifically, to a device for heating a core in which steel plates having an adhesive are laminated.

[0002] Electrical devices such as transformers and motors utilize a core, also known as an iron core, around which a conductor is wound to convert voltage or generate a magnetic field; this core is formed by laminating and bonding multiple steel plates punched into specific shapes.

[0003] Laminated cores are manufactured by stacking multiple electrical steel sheets vertically and joining them, then winding wires to minimize iron loss reduction. If the bonding force between the sheets is weak, individual sheets or parts of the laminated steel sheets may separate due to mechanical impact. Conventionally, mechanical bonding methods such as welding and interlocking were used to resolve this issue; however, residual stress remaining in the core steel sheets after processing caused degradation of magnetic properties, which increased iron loss in the core and reduced motor efficiency. To avoid this, chemical bonding methods such as dot bonding or self-bonding are being used recently.

[0004] Specifically, dot-bonding is a method of manufacturing a core by partially applying adhesive to individual electrical steel sheets after punching them in a press, and then thermally fusing them during lamination. Self-bonding is a method of manufacturing a core by laminating electrical steel sheets with a semi-cured adhesive layer, thermally fusing them at a high temperature using a separate heating means such as hot air, near-infrared radiation, or induction heating, and then passing them through a cooling device. Here, thermal fusing refers to curing the adhesive by heating to a high temperature under pressure.

[0005] Since the major heating methods currently in use only heat the outer surface of the object, heating the inner side of the object relies solely on the heat conduction of the object itself. Consequently, there is a disadvantage in that the temperature of the inner part of the motor core lamination is always low. This temperature variation tends to worsen as the heating speed is increased. Furthermore, non-conductive materials such as the insulating coating layer and adhesive layer on the surface of the stamped steel sheet reduce the thermal conductivity of the lamination, thus acting as a negative factor in the temperature variation problem.

[0006] According to one embodiment of the present invention, a heat-fusion type core heating device may be provided, wherein a core formed by lamination of steel plates interposed with a thermosetting adhesive has adhesive strength of uniform quality throughout the body without needing to depend on the location of the heat source.

[0007] According to another embodiment of the present invention, a heat-fusion type core heating method capable of heating a core in a short time can be provided.

[0008] The problems of the present invention are not limited to those described above. A person skilled in the art to which the present invention pertains will have no difficulty understanding additional problems of the present invention from the overall contents of this specification.

[0009] A heat-fusion type core heating device according to one embodiment of the present invention may include: a jig comprising a lower jig supporting a core in which steel plates are stacked and an upper jig pressing the core; a first electrode in contact with at least a portion of one surface of the core formed by the stacking of the steel plates; a second electrode in contact with at least a portion of the other surface of the core formed by the stacking of the steel plates; and a power supply device that supplies power to the core using the first electrode and the second electrode.

[0010] One surface of the first electrode may have a shape corresponding to at least a part of the shape of one surface of the core, and one surface of the second electrode may have a shape corresponding to at least a part of the shape of the other surface of the core.

[0011] The first electrode and the second electrode are a plurality of such electrodes, and one surface of the plurality of first electrodes is in contact with one surface of the core, and one surface of the plurality of second electrodes is in contact with the other surface of the core, and the one surfaces of the plurality of first electrodes and the one surfaces of the plurality of second electrodes are each paired with one another so as to face each other with respect to a divided part of the core.

[0012] The plurality of first electrodes may be spaced apart from each other when in contact with one surface of the core, and the plurality of second electrodes may be spaced apart from each other when in contact with the other surface of the core.

[0013] The apparatus may further include a mechanism for aligning the plurality of first electrodes such that one surface of each of the plurality of first electrodes contacts one surface of the core.

[0014] The plurality of first electrodes above may be electrically connected in parallel, and the plurality of second electrodes above may be electrically connected in parallel.

[0015] In the steel plate laminated in a divided portion of the core interposed between the plurality of first electrodes and the plurality of second electrodes that form pairs with each other, current may flow in a direction from the plurality of first electrodes toward the plurality of second electrodes or in a direction from the plurality of second electrodes toward the plurality of first electrodes.

[0016] Regardless of the position of one side of the core and the other side of the core where the first electrode and the second electrode contact, the temperature change of the core may include a section in which the temperature change of the core changes linearly.

[0017] A heat-fusion type core heating method according to another embodiment of the present invention may include the process of mounting a jig on a core in which steel plates are stacked; the process of contacting one surface of a first electrode to at least a portion of one surface of the core formed by the stacking of the steel plates, and contacting one surface of a second electrode to at least a portion of the other surface of the core formed by the stacking of the steel plates; and the process of supplying power to the first electrode and the second electrode.

[0018] The method may include a process of arranging the plurality of first electrodes and the plurality of second electrodes such that the first electrodes and the second electrodes are a plurality of such electrodes, each of which has one surface of the plurality of first electrodes in contact with at least a portion of one surface of the core, each of which has one surface of the plurality of second electrodes in contact with at least a portion of the other surface of the core, and the first surfaces of the plurality of first electrodes and the second surfaces of the plurality of second electrodes are paired with each other and face each other with respect to a divided portion of the core.

[0019] The plurality of first electrodes above may be electrically connected in parallel, and the plurality of second electrodes above may be electrically connected in parallel.

[0020] The process of supplying power to the first electrode and the second electrode may include the process of supplying power to the plurality of first electrodes and the plurality of second electrodes.

[0021] Regardless of the position of one side of the core and the other side of the core where the first electrode and the second electrode contact, the temperature change of the core may include a section in which the temperature change of the core changes linearly.

[0022] According to the present invention, a high-quality core can be provided that ensures uniform thermal fusion of the core and secures fastening force and dimensional accuracy between steel plates.

[0023] In addition, according to the present invention, a heating device with high energy efficiency that heats the core in a short time is provided, so that the productivity of the core can be improved.

[0024] Figure 1 is a drawing illustrating the upper surface of a steel plate forming a core.

[0025] FIG. 2 is a schematic perspective view illustrating a part of a heat-fusion type core heating device according to one embodiment of the present invention.

[0026] FIG. 3 is a cross-sectional view schematically illustrating a part of a heat-fusion type core heating device according to one embodiment of the present invention.

[0027] Preferred embodiments of the present invention will be described below with reference to the attached drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

[0028] In addition, embodiments of the present invention are provided to more fully explain the present invention to those with average knowledge in the relevant technical field.

[0029] In drawings, the shapes and sizes of elements may be exaggerated for clearer explanation.

[0030] In describing the embodiments of the present invention, if it is determined that a detailed description of known technology related to the present invention may unnecessarily obscure the essence of the present invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, such definitions should be based on the content throughout this specification. The terms used in the detailed description are merely for describing the embodiments of the present invention and should not be limited in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form.

[0031] In this description, expressions such as “include” or “equipped” are intended to refer to certain characteristics, numbers, steps, actions, elements, parts or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts or combinations thereof other than those described.

[0032] Unless otherwise specifically defined in the specification of the present invention, % units mean weight %.

[0033] In this specification, terms such as 'top', 'upper', 'upper surface', 'lower', 'lower surface', 'lower surface', and 'side surface' are based on the drawings and may actually vary depending on the direction in which the elements or components are arranged.

[0034] Additionally, throughout the specification, when it is said that one part is 'connected' to another part, this includes not only cases where they are 'directly connected,' but also cases where they are 'indirectly connected' with other elements in between.

[0035] The present invention will be described in detail below through each embodiment or example of the invention. It should be noted that each embodiment or example described in this specification is not limited to a single embodiment or example, but may also be combined with other embodiments or examples. Accordingly, the citation of claims in the patent claims is merely an example of an embodiment, and the technical concept of the present invention should not be interpreted as being limited only to a combination with the cited claims; rather, combinations with various claims are also included within the scope of the technical concept of the present invention.

[0036] Figure 1 is a drawing illustrating the upper surface of a steel plate forming a core.

[0037] Referring to FIG. 1, the core has a structure in which steel plates (11) of the illustrated shape are laminated. The steel plates include a yoke portion (12) that serves as a passage for magnetic field lines in the radial direction and a tooth portion (14) having a plurality of slots (13) in the circumferential direction of the core to allow coils to enter. When steel plates of this shape are laminated and combined, a cylindrical core having a hollow is formed. When a rotor is inserted into the hollow of the stator containing the core, the rotor performs the role of converting electrical energy into driving energy in response to the electromagnetic field generated from the stator.

[0038] The present invention will be described in detail below through examples. However, it should be noted that the examples described below are intended merely to illustrate and embody the present invention and are not intended to limit the scope of the present invention. This is because the scope of the present invention is determined by the matters described in the patent claims and matters reasonably inferred therefrom.

[0039] FIGS. 2 and FIGS. 3 are a perspective view and a cross-sectional view schematically illustrating a part of a heat-fusion type core heating device according to one embodiment of the present invention.

[0040] Referring to FIGS. 2 and 3, a heat-fusion type core heating device according to one embodiment of the present invention includes a jig (not shown) that supports and pressurizes a core (10), a pair of electrodes (100) that contact the outer surface of the core (10) formed by a stack of steel plates (11) to allow current to flow through the core (10), and a power supply device (200) that supplies power to the electrodes. The heating device transmits electrical energy to the core (10) through the electrodes (100) and the power supply device (200) while the core (10) is pressed by the jig. The electrical energy is converted into thermal energy by the electrical resistance of the core (10) itself, and the core (10) is heated to the curing temperature of the adhesive set. That is, the heating device causes the core (10) to generate heat by supplying power to the core (10) using the fact that the core (10) itself is an electrical resistor.

[0041] A jig (not shown) includes a lower jig that supports the core (10) and an upper jig that presses the core (10). The upper jig may have a donut shape with a hollow structure in relation to the placement of electrodes (110) placed on the inner circumference of the core. The jig maintains a pressurized state while the core (10) is heated. As shown in the illustration, since the electrodes (100) maintain contact with the core (10) during the heating process, the electrodes (100) can serve as a jig that maintains and fixes the shape of the core (10). In particular, the electrodes (110) that contact the inner circumference of the core (10) also serve to fix the tooth portion (14) during heating, thereby ensuring the dimensional accuracy (cylindricality, perpendicularity, etc.) of the core (10).

[0042] The electrode (100) includes a first electrode (110) that contacts at least a portion of one side of the core (10) formed by stacking steel plates (11), and a second electrode (120) that contacts at least a portion of the other side of the core (10) formed by stacking steel plates (11). As shown in FIG. 1, when the core (10) is formed by stacking steel plates (11) that have a hollow space, the core (10) is a cylindrical shape having a hollow space. One side of the core (10) corresponds to the inner surface defining the hollow space, and the other side of the core (10) corresponds to the outer surface of the cylinder.

[0043] In the example of the city, the first electrode (110) is positioned to contact the inner surface of the core, and the second electrode (120) is positioned to contact the outer surface of the core. When the first electrode (110) is electrically connected to the inner surface of the core and the second electrode (120) is electrically connected to the outer surface of the core, an electric field is formed in each steel plate forming the core in a positive or negative radial direction from the inner surface to the outer surface or from the outer surface to the inner surface. Accordingly, electrons within the steel plate move, that is, current flows, and the steel plate generates heat due to its own resistance.

[0044] One surface of the first electrode (110), for example, the outer surface, has a shape corresponding to at least a part of the shape of one surface of the core (10), for example, the inner surface. One surface of the second electrode (120), for example, the inner surface, has a shape corresponding to at least a part of the shape of the other surface of the core (10), for example, the outer surface. At this time, the entire outer surface of the first electrode (110) can contact at least a part of the inner surface of the core (10), and the entire inner surface of the second electrode (120) can contact at least a part of the outer surface of the core (10).

[0045] There are multiple first electrodes (110) and second electrodes (120). The first electrodes (110) and second electrodes (120) are paired with each other in equal numbers. Since the electrodes (100) must repeatedly come into contact with and detach from multiple cores, it is preferable that they be made up of multiple pairs. Although the illustration illustrates that there are four first electrodes (110) and four second electrodes (120) each, preferably there may be at least three first electrodes (110) and three or more second electrodes (120).

[0046] One surface of a plurality of first electrodes (110) may be in contact with one surface of the core (10), and one surface of a plurality of second electrodes (120) may be in contact with the other surface of the core (10). That is, the outer surfaces of a plurality of first electrodes (110) may be in contact with the inner surface of the core (10), and the inner surfaces of a plurality of second electrodes (120) may be in contact with the outer surface of the core (10). The electrodes are arranged such that the one surfaces of a plurality of first electrodes (110) and the one surfaces of a plurality of second electrodes (120) each form pairs with one another and face each other with respect to a part of the core (10).

[0047] The number of electrodes (100) is the number of angles into which the core (10), which is the object to be heated, is divided, and the shape of the electrodes (100) corresponds to the shape of the inner and outer surfaces of the divided portions of the core. The entire outer surface of the plurality of first electrodes (110) and the entire inner surface of the plurality of second electrodes (120) structurally correspond to the inner and outer surfaces of the divided portions of the core (10). The entire outer surface of the plurality of first electrodes (110) and the entire inner surface of the plurality of second electrodes (120) are in complete contact with the inner and outer surfaces of the divided portions of the core (10).

[0048] When a plurality of electrodes (100) are arranged to surround the core (10), a plurality of first electrodes (110) are spaced apart from each other when in contact with one side of the core, and a plurality of second electrodes (120) are spaced apart from each other when in contact with the other side of the core (10). This is because the plurality of electrodes (100) must repeatedly contact and detach from a plurality of cores. In particular, as illustrated in FIG. 3, the plurality of first electrodes (110) are in contact without being spaced apart from each other before contacting the core (10), and are spaced apart from each other after contacting the core (10). In this case, the spacing between them must be the minimum necessary for the arrangement operation for contact and detachment. That is, one side of the plurality of first electrodes (110) can be in contact with almost the entire inner surface of one side of the core (10), for example. Correspondingly, one side of the plurality of second electrodes (120) can be in contact with almost the entire outer surface of the other side of the core (10), for example.

[0049] The heating device further includes a first mechanism (not shown) for aligning a plurality of first electrodes (110) such that a plurality of first electrodes (110) contact and detach from one surface (e.g., inner surface) of the core (10), and a second mechanism (not shown) for aligning a plurality of second electrodes (120) such that a plurality of second electrodes (120) contact and detach from the other surface (e.g., outer surface) of the core (10). The first mechanism may be a mandrel or a collet.

[0050] A plurality of first electrodes (110) are electrically connected in parallel with each other, and a plurality of second electrodes (120) are electrically connected in parallel with each other. When current is applied, the same potential difference is formed between the pair of first electrodes (110) and second electrodes (110). A divided portion of the core electrically connected between the pair of electrodes, the first electrode (110) and the second electrode (120), is a resistor, and an electric field is formed in a positive or negative radial direction from the inner surface to the outer surface or from the outer surface to the inner surface in each steel plate within the divided portion of the core, depending on the potential difference formed in the electrodes. Accordingly, electrons within the steel plate move, that is, current flows, and the steel plate generates heat due to its own resistance.

[0051] As in the illustrated embodiment, when one side of a plurality of first electrodes (110) is in contact with almost the entire inner surface of one side of the core (10), for example, and one side of a plurality of second electrodes (120) is in contact with almost the entire outer surface of the other side of the core (10), for example, a positive or negative radial current flows throughout the steel plate forming the core (10), and the steel plate generates heat due to its own resistance. As a result, the core (10) is heated throughout and its temperature rises.

[0052] In the embodiments of the present invention, since the core is heated directly by the current flowing inside as an electric resistor, unlike the heating method in which heat is applied to the surface of the core and conducted into the interior, where the temperature of the core changes non-linearly, according to the present invention, the core has a section in which the temperature changes linearly regardless of the area where the electrode contacts. The inventors measured the temperature history according to heating on the inner surface side of the core in contact with the first electrode and on the outer surface side of the core in contact with the second electrode, and confirmed that the temperature history curves at the tooth portion (14) on the inner surface side of the core and the yoke portion (12) on the outer surface side of the core include a section in which the temperature changes linearly.

[0053] The power supply unit (200) supplies power when the electrodes (100) come into contact with the outer surface of the core (10). When the electrodes (100) come into contact with the outer surface of the core (10), the power supply unit (200), a pair of electrodes (100), and the core (10) (resistor) form a closed circuit. The power supply unit (200) may include a power supply unit and a control unit. The control unit can control the magnitude and supply time of the supply voltage or supply current of the power supply unit. The control unit can adjust the magnitude and supply time of the supply voltage or supply current of the power supply unit according to the temperature change history of the core.

[0054] When the electrodes (100) come into contact with the outer surface of the core (10), the power supply (200), a pair of electrodes (100), and the steel plate (11) forming the core (10) form a closed circuit, and current flows through the steel plate (11), causing the steel plate (11) to generate heat. The heated steel plate (11) can conduct heat to other steel plates that are in contact above and below. Additionally, the heated steel plate (11) can conduct heat to the electrodes (100). The electrodes (100) may include a cooling means. The cooling means may be a flow path formed inside the body of the electrode or a cooling fin formed on a surface that does not come into contact with the core.

[0055] The heating device may further include insulating plates interposed between the upper surface of the core and the upper jig, and between the lower surface of the core and the lower jig. The insulating plates prevent current from flowing out of the core, which is the object to be heated.

[0056] A heat-fusion type core heating method according to embodiments of the present invention includes a process (S100) of mounting a core (10) on which stamped steel plates (11) are stacked onto a jig, a process (S200) of contacting one surface of a first electrode (110) to at least a part of one side of the core (10) formed by stacking steel plates (11) so that current flows through the core (10) and contacting one surface of a second electrode (120) to at least a part of the other side of the core (10) formed by stacking steel plates (11), and a process (S300) of supplying power to the first electrode (110) and the second electrode (120). In the process of the heating method, while the core (10) is pressed by a jig, the electrode (100) and the power supply (200) transmit electrical energy to the core (10), and the electrical energy is converted into thermal energy by the electrical resistance of the core (10) itself, and the core (10) is heated to the curing temperature of the set adhesive. That is, the heating method adopts an electric resistance heating (Joule's heating) method in which current is passed through the core (10), particularly through each of the laminated steel plates, using the fact that the core (10) itself is an electric resistor, so that the core (10) generates heat on its own.

[0057] In process S100, a lower jig supporting the core (10) and an upper jig pressing the core (10) are mounted. The jig maintains the pressurized state while the core (10) is heated.

[0058] In process S200, the first electrode (110) is positioned to contact at least a portion of one side of the core (10) formed by the lamination of steel plates (11), and the second electrode (120) is positioned to contact at least a portion of the other side of the core (10) formed by the lamination of steel plates (11). As shown in FIG. 1, when the core (10) is formed by the lamination of steel plates (11) having a hollow core, the core (10) is a cylindrical shape having a hollow core. One side of the core (10) corresponds to the inner surface defining the hollow core, and the other side of the core (10) corresponds to the outer surface of the cylinder.

[0059] In process S200, one side of the first electrode (110) is positioned to contact the inner surface of the core (10), and one side of the second electrode (120) is positioned to contact the outer surface of the core (10). Through contact between one side of the electrodes (100) and the outer surface of the core (10), the first electrode (110) is electrically connected to the inner surface of the core (10), and the second electrode (120) is electrically connected to the outer surface of the core (10). Due to the electrical connection between the electrodes (100) and the core (10), an electric field is formed in each steel plate (11) forming the core (10) in a positive or negative radial direction from the inner surface to the outer surface or from the outer surface to the inner surface. Accordingly, electrons within the steel plate (11) move, that is, current flows, and the steel plate (11) generates heat due to its own resistance.

[0060] There are multiple first electrodes (110) and second electrodes (120). The first electrodes (110) and second electrodes (120) are paired with each other in equal numbers. Since the electrodes (100) must repeatedly come into contact with and detach from multiple cores, it is preferable that they be made up of multiple pairs.

[0061] In process S200, one surface of a plurality of first electrodes (110) may be in contact with one surface of the core (10), and one surface of a plurality of second electrodes (120) may be in contact with the other surface of the core (10). That is, the outer surfaces of a plurality of first electrodes (110) may be in contact with the inner surface of the core (10), and the inner surfaces of a plurality of second electrodes (120) may be in contact with the outer surface of the core (10). The electrodes are arranged so that the one surfaces of a plurality of first electrodes (110) and the one surfaces of a plurality of second electrodes (120) each form pairs with one another and face each other with respect to a part of the core (10).

[0062] The number of electrodes (100) is the number of angles into which the core (10), which is the object to be heated, is divided, and the shape of the electrodes (100) corresponds to the shape of the inner and outer surfaces of the divided portions of the core. The entire outer surface of the plurality of first electrodes (110) and the entire inner surface of the plurality of second electrodes (120) structurally correspond to the inner and outer surfaces of the divided portions of the core (10). In process S200, the entire outer surface of the plurality of first electrodes (110) and the entire inner surface of the plurality of second electrodes (120) are in complete contact with the inner and outer surfaces of the divided portions of the core (10).

[0063] In process S200, when a plurality of electrodes (100) are arranged to surround the periphery of the core (10), a plurality of first electrodes (110) are spaced apart from each other when in contact with one side of the core, and a plurality of second electrodes (120) are spaced apart from each other when in contact with the other side of the core (10). This is because the plurality of electrodes (100) must repeatedly contact and detach from a plurality of cores. In particular, as illustrated in FIG. 3, the plurality of first electrodes (110) are in contact without being spaced apart from each other before contacting the core (10), and are spaced apart from each other after contacting the core (10). In this case, the spacing between them must be the minimum necessary for the arrangement operation for contact and detachment. That is, one side of the plurality of first electrodes (110) can be in contact with almost the entire inner surface of one side of the core (10), for example. Accordingly, one side of a plurality of second electrodes (120) can be in contact with the other side of the core (10), for example, almost the entire outer surface.

[0064] In process S200, the first mechanism aligns the plurality of first electrodes (110) so that the plurality of first electrodes (110) contact and detach from one side (e.g., inner surface) of the core (10), and the second mechanism aligns the plurality of second electrodes (120) so that the plurality of second electrodes (120) contact and detach from the other side (e.g., outer surface) of the core (10).

[0065] In process S200, a plurality of first electrodes (110) are electrically connected in parallel with each other, and a plurality of second electrodes (120) are electrically connected in parallel with each other. When current is applied, the same potential difference is formed between the pair of first electrodes (110) and second electrodes (110). A divided portion of the core electrically connected between the pair of electrodes, the first electrode (110) and the second electrode (120), is a resistor, and an electric field is formed in a positive or negative radial direction from the inner surface to the outer surface or from the outer surface to the inner surface in each steel plate within the divided portion of the core, depending on the potential difference formed in the electrodes. Accordingly, electrons inside the steel plate move, that is, current flows, and the steel plate generates heat due to its own resistance.

[0066] In process S200, as illustrated in FIG. 3, one surface of a plurality of first electrodes (110) may be in contact with one surface of the core (10), for example, almost the entire inner surface, and one surface of a plurality of second electrodes (120) may be in contact with the other surface of the core (10), for example, almost the entire outer surface. In this case, when power is supplied in process S300, a positive or negative current flows in the radial direction throughout the steel plate forming the core (10), and the steel plate generates heat due to its own resistance. As a result, the core (10) is heated throughout and its temperature rises.

[0067] In process S300, when process S200 is completed, that is, when contact between the electrodes (100) and the outer surface of the core (10) is completed, the power supply unit (200) supplies power when the electrodes (100) are in contact with the outer surface of the core (10). When the electrodes (100) are in contact with the outer surface of the core (10), the power supply unit (200), a pair of electrodes (100), and the core (10) (resistance) form a closed circuit. When the power supply unit supplies power in process S300, a positive or negative current flows radially throughout the steel plate forming the core (10), and the steel plate generates heat due to its own resistance. As a result, the core (10) is heated entirely and its temperature rises.

[0068] Since the embodiments of the present invention apply a method in which the core is directly heated by the current flowing inside as an electric resistor, unlike a heating method in which heat is applied to the surface of the core and conducted into the interior, where the temperature of the core changes non-linearly, according to the present invention, in process S300, the core has a section in which the temperature changes linearly regardless of the area where the electrode contacts.

[0069] In process S300, the power supply unit (200) can control the magnitude and supply time of the supply voltage or supply current. Furthermore, the power supply unit (200) can adjust the magnitude and supply time of the supply voltage or supply current of the power supply unit according to the temperature change history of the core.

Claims

1. A jig comprising a lower jig supporting a core in which steel plates are laminated and an upper jig pressing the core; A first electrode in contact with at least a portion of one surface of the core formed by the lamination of the above steel plates; A second electrode in contact with at least a portion of the other side of the core formed by the lamination of the steel plates; and A heat-fusion type core heating device comprising a power supply device that supplies power to the core using the first electrode and the second electrode.

2. In Paragraph 1, One surface of the first electrode has a shape corresponding to at least a portion of the shape of one surface of the core, and A heat-fusion type core heating device in which one surface of the second electrode has a shape corresponding to at least a part of the shape of the other surface of the core.

3. In Paragraph 1, The first electrode and the second electrode are a plurality of, One surface of the plurality of first electrodes above is in contact with one surface of the core, and One surface of the plurality of second electrodes above is in contact with the other surface of the core, and A heat-fusion type core heating device in which the surfaces of the plurality of first electrodes and the surfaces of the plurality of second electrodes each form pairs with each other and face each other with respect to a divided portion of the core.

4. In Paragraph 3, The plurality of first electrodes are spaced apart from each other when in contact with one surface of the core, and A heat-fusion type core heating device in which the plurality of second electrodes are spaced apart from each other when in contact with the other surface of the core.

5. In Paragraph 4, A heat-fusion type core heating device further comprising a mechanism for aligning the plurality of first electrodes such that one surface of the plurality of first electrodes contacts one surface of the core.

6. In Paragraph 3, The plurality of first electrodes are electrically connected in parallel, and A heat-fusion type core heating device in which the plurality of second electrodes are electrically connected in parallel.

7. In Paragraph 6, A heat-fusion type core heating device in which a current flows in a direction from the plurality of first electrodes toward the plurality of second electrodes or from the plurality of second electrodes toward the plurality of first electrodes within a steel plate laminated in a divided portion of the core in which the plurality of first electrodes and the plurality of second electrodes are interposed between each other.

8. In Paragraph 1, A heat-fusion type core heating device comprising a section in which the temperature change of the core changes linearly regardless of the position of one side of the core and the other side of the core where the first electrode and the second electrode contact.

9. Process of mounting a jig on a core with laminated steel plates; A process of contacting one surface of a first electrode to at least a portion of one surface of the core formed by the lamination of the steel plates, and contacting one surface of a second electrode to at least a portion of the other surface of the core formed by the lamination of the steel plates; and A heat-fusion type core heating method comprising the process of supplying power to the first electrode and the second electrode.

10. In Paragraph 9, The first electrode and the second electrode are a plurality of, Each of the surfaces of the plurality of first electrodes is in contact with at least a portion of one surface of the core, and Each of the surfaces of the plurality of second electrodes is in contact with at least a portion of the other surface of the core, and A heat-fusion type core heating method comprising the process of arranging the plurality of first electrodes and the plurality of second electrodes such that the surfaces of the plurality of first electrodes and the surfaces of the plurality of second electrodes each form pairs with each other and face each other with respect to a divided portion of the core.

11. In Paragraph 10, The plurality of first electrodes are electrically connected in parallel, and A heat-fusion type core heating method in which the plurality of second electrodes are electrically connected in parallel.

12. In Paragraph 10, The process of supplying power to the first electrode and the second electrode is, A heat-fusion type core heating method comprising the process of supplying power to the plurality of first electrodes and the plurality of second electrodes.

13. In Paragraph 9, A heat-fusion type core heating method comprising a section in which the temperature change of the core changes linearly regardless of the position of one side of the core and the other side of the core where the first electrode and the second electrode contact.

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