Electromagnetic device with improved cooling function

Abstract

To provide an electromagnetic device with improved cooling performance. [Solution] The electromagnetic device of the present invention has a magnetic core 10 and a cooling structure 30. The core 10 has a coil 20 wound around a central axis X and has a slit 11 parallel to the axis X. The slit 11 divides the core 10 into a plurality of core portions 10'. The cooling structure 30 has a heat sink / HS32 that contacts a heat transfer element 31, and the heat transfer element 31 has a plate made of a non-magnetic metal, which is inserted into the slit 11. The cooling structure 30 is divided into two halves that overlap in the direction of axis X. The two halves have the HS32 and a portion of the heat transfer element 31, the heat transfer element 31 is in contact with the corresponding HS32, and the induced current flowing through the cooling structure 30 is blocked by an air gap or insulator, which is located between the portions of the heat transfer element 31 surrounded by the coil 20, or between the portions of the cooling structure 30 surrounding the coil 20.

Description

Technical Field

[0001] The present invention relates to an electromagnetic device with improved cooling function.

[0002] The electromagnetic device includes a magnetic core around which a conductive coil (hereinafter simply referred to as "coil") is wound. The improvement in the cooling function is obtained with a cooling structure that includes a heat-conducting element made of a non-magnetic material. This heat-conducting element is in close contact with the heat sink. The heat-conducting element includes a flat wall / plate. This flat wall / plate is closely inserted into a slit that divides the magnetic core into two independent magnetic core parts.

Background Art

[0003] Various approaches have been attempted to dissipate heat generated by eddy currents from the core of a magnetic power unit in the case of a power transformer. Some of these include the following. * Increase in wire size to reduce resistive losses, * Immersion of the transformer in circulating cooling oil, * Air cooling of the transformer windings, * Increase in the operating frequency of the transformer to reduce the number of windings, and * Increase in the thermal conductivity of the insulating potting compound around the transformer windings. However, all of these affect the mechanical size and weight of the transformer design and limit their application. Without proper cooling, the efficiency and reliability of transformers and inductors are significantly reduced.

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

[0005] Patent Document 1 discloses a power transformer for high currents (hereinafter simply referred to as "transformer"). This transformer has a closed cylindrical core made of a soft magnetic high-permeability material with high saturation induction and low magnetic loss. Primary coils and secondary coils are wound around this core. The core is housed in a case filled with a suitable resin. A heat pipe (9) for cooling the unit is located in the center. The heat pipe forms at least a portion of the transformer windings.

[0006] Because the contact surface between the duct and the magnetic core is reduced, circulation of the cooling fluid through the pipe is necessary to increase cooling, which complicates the cooling structure and makes the solution expensive.

[0007] Patent Document 2 discloses power cooling technologies, particularly devices for cooling high-voltage transformers and electric motors. These use a heat-conducting material interposed between the winding layers and the laminated iron core of a high-voltage transformer to provide a path with low thermal resistance to the atmosphere. The heat-conducting strip guides excess heat from the inside to the outer protrusions of the windings (and core), where it is dissipated via forced air or a heat-conducting potting compound. This technology allows for a significant reduction in weight and capacity, even as power density increases while operating at moderately high temperatures in the atmosphere. In one embodiment, the transformer is formed from a core of laminated iron, ferrite, and other materials, and insulating copper windings wound around this core. Heat is dissipated through the core to the base plate, but a heat-conducting strip, preferably made of a high-elasticity graphite laminated material, is positioned in a predetermined location between the windings and transfers heat along its unidirectional fiber orientation.

[0008] Patent Document 3 discloses an electromagnetic device. This electromagnetic device consists of a first tubular magnetic core portion, a second tubular magnetic core portion, and a primary winding. The second tubular magnetic core portion is spaced apart from the first tubular magnetic core portion and aligned substantially parallel to it. The first portion of the primary winding is located within the first tubular magnetic core portion, and the second portion is located within the second tubular magnetic core portion. The magnetic device further comprises a heat extraction means having a heat transfer element. An example of this heat transfer element is a cooling fin, which is in thermal communication with at least a portion of the outer surface of the first tubular magnetic core portion and at least a portion of the outer surface of the second tubular magnetic core portion.

[0009] Patent Document 4 discloses a heat dissipation structure for a transformer to dissipate heat generated from the core of the transformer. This transformer includes a heat sink. The heat sink includes a bottom plate attached to the housing of the transformer and an extension plate extending upward from the bottom plate. The extension plate includes a central plate and a pair of side plates positioned on either side of the central plate. The pair of side plates are spaced apart from the central plate.

[0010] Patent Document 5 discloses a high-power / high-efficiency high-frequency transformer equipped with an aluminum heat sink (plate). The aluminum heat sink is constructed by arranging a first aluminum plate, a second aluminum plate, and a third aluminum plate alternately.

[0011] Patent document 6 relates to thermal management of electromagnetic devices such as transformers. This electromagnetic device includes a core assembly, windings, a primary heat transfer plate, and a plurality of secondary heat transfer plates. However, in all of the above-mentioned patent documents 1-6, the cooling structure is located on only one side of the electromagnetic device, and uniform cooling of the magnetic core cannot be achieved. [Overview of the Initiative] The invention aims to solve a problem

[0012] The object of the present invention is to solve the shortcomings of the above-mentioned literature, namely, the problem of uneven cooling of the magnetic core that occurs when a cooling structure is placed on only one side of the electromagnetic device. [Means for solving the problem]

[0013] The present invention provides an electromagnetic device with improved cooling function, as defined in claim 1. The electromagnetic device of the present invention includes the following conventionally known magnetic core and cooling structure. *Magnetic core. This magnetic core has a coil wound around its circumference along its central axis (up and down in the diagram). The magnetic core includes a slit parallel to the central axis, dividing the magnetic core into several independent magnetic core sections. *Cooling structure. This cooling structure includes a heat sink that is in heat transfer contact with the heat transfer elements. Each heat transfer element includes a flat wall / plate (hereinafter simply referred to as "plate") made of a non-magnetic metal, which is tightly inserted into one of the slits of the magnetic core that is in heat transfer contact with the magnetic core portion.

[0014] The heat transfer element is made of a non-magnetic material. This heat transfer element does not interfere with the magnetic field generated in the electromagnetic device during its operation and has high thermal conductivity (e.g., 120 W / mK or higher, 160 W / mK or higher, or preferably 210 W / mK or higher). Generally, the heat transfer element is made of a non-magnetic metal such as aluminum or an aluminum alloy.

[0015] The close contact between the heat transfer element and the heat dissipation surface of the magnetic core allows for the transfer of heat generated when the electromagnetic device is operating from the magnetic core to the heat transfer element.

[0016] Through close contact between the heat transfer element and the heat sink, heat is transferred from the heat transfer element to the heat sink, where it is dissipated.

[0017] Heat sinks are made from materials with the aforementioned high thermal conductivity. Generally, heat sinks are made of non-magnetic metals such as aluminum or aluminum alloys.

[0018] The heat sink preferably includes a heat dissipation configuration that comes into contact with a cooling fluid, such as ambient air, but it may also be a coolant for a cooling circuit.

[0019] The heat dissipation configuration includes, for example, a surface having grooves, ribs or rods, or a surface with any surface expansion configuration that intentionally contacts the exposed surface of the heat sink with a cooling fluid.

[0020] Heat transfer contact is either physical contact between elements (enabling heat transfer by heat conduction between the elements) or contact through a heat-conductive medium (such as a heat-conductive composition). This enables heat conduction between them through the heat-conductive medium.

[0021] Heat transfer contact exists, for example, between the following. * Between parts of the same single-piece object, * Between two welded components, * Between two overlapping surfaces with no gap, or * Between two overlapping surfaces containing a heat-conductive composition between them to increase the overall thermal conductivity. The heat-conductive composition is a ductile paste with a thermal conductivity above the above-mentioned value.

[0022] According to the present invention, the heat transfer element includes a plate densely inserted into a slit in a magnetic core. This slit divides the magnetic core into a plurality of independent magnetic core parts. Preferably, this slit divides the region of the magnetic core surrounded by the coil. As a result, the heat transfer element is inserted into the region of the magnetic core surrounded by the coil.

[0023] According to the above, the magnetic core is divided into a plurality of independent magnetic core parts facing each other, forming a slit between them. The heat transfer element includes a plate-shaped part and is densely inserted into the slit, that is, between the plurality of independent magnetic core parts.

[0024] This configuration significantly increases the contact surface between the heat-dissipating magnetic core and the heat transfer element, increasing the cooling of the electromagnetic device.

[0025] Preferably, the magnetic core portions face each other via corresponding heat dissipation surfaces. Slits are formed between the heat dissipation surfaces. The heat transfer element has two opposing main surfaces, which correspond to two opposing main surfaces of a flat plate, each in close contact with one of the heat dissipation surfaces.

[0026] The present invention has the following novel features. *The cooling structure is divided into two "halves," which are stacked along the central axis (up and down in the diagram). Each half includes one heatsink and a portion of the heat transfer elements that make heat transfer contact with the corresponding heatsink. * The induced current flowing through the cooling structure is interrupted by air gaps or insulators. The air gaps or insulators are formed or placed between multiple parts of the heat transfer element surrounded by the coil, and / or between multiple parts of the cooling structure surrounding the coil.

[0027] According to the above, the cooling structure includes at least two (i.e., more than one) heatsinks. One is integrated into each half of the cooling structure. The heat transfer element is divided into several independent parts, each part making heat transfer contact with one of the heatsinks.

[0028] The two halves of the cooling structure are arranged overlapping in the direction of the central axis (up and down). As a result, the heat transfer element portion of one half is divided laterally (horizontally / laterally in the diagram) with respect to the central axis, and separated from the other half.

[0029] Preferably, the heat transfer element is inserted into the region of the magnetic core surrounded by the coil, and the cooling structure surrounds the outside of the magnetic device. If the cooling structure is made of a conductive material such as aluminum alloy or aluminum, an induced current may flow through the cooling structure. This is undesirable.

[0030] To prevent induced current, the formation of circulating electrical circuits in the region surrounded by the coil must be prevented. To prevent induced current, electrical connections between parts of the heat transfer element are interrupted by air gaps or insulators in the region of the magnetic core surrounded by the coil.

[0031] Additionally or by alternative means, the interruption of the circulating electrical circuit prevents induced current, but this is achieved by interrupting the electrical connection between the two halves of the cooling structure in the region of the cooling structure not surrounded by the coil. In this case, induced current is prevented even if the portion of the thermal element surrounded by the coil is electrically connected.

[0032] According to one embodiment of the present invention, the plate included in the heat transfer element is parallel to the central axis around which the coil is wound.

[0033] The heat transfer element may include multiple heat transfer elements arranged in parallel. The magnetic core may be divided through multiple slits that are parallel to each other.

[0034] Alternatively, the heat transfer element may include one or a plurality of parallel heat transfer elements (formed by dividing a magnetic core with a plurality of mutually parallel slits) and one or a plurality of parallel heat transfer elements perpendicular to the heat transfer elements (formed by further dividing the magnetic core with additional slits perpendicular to the plurality of mutually parallel slits).

[0035] Each heatsink may be a housing that contains a magnetic core, or a part of said housing. The outer wall of the housing functions as a heatsink that dissipates heat to the surrounding air.

[0036] The heat transfer element further includes an external heat transfer element. This external heat transfer element is Made of non-magnetic metal, The magnetic core is in contact with an adjacent heat sink for heat transfer, The magnetic core is in thermal contact with and / or A plate is tightly inserted into one of the slits of the magnetic core and is brought into contact with it for heat transfer. According to this embodiment, the external heat transfer element is The magnetic core is in thermal contact with the outside of it, either directly or through an intervening heat transfer medium. Heat is dissipated from the outside of the magnetic core to the heatsink. A plate is tightly inserted into a slit in the magnetic core and is in thermal contact with it, and / or The plate helps transfer the heat generated inside the magnetic core to the heat sink.

[0037] The heat transfer elements and heat sinks may be part of a single main body element that constitutes the cooling structure. This simplifies their manufacturing and improves heat conduction between the heat transfer elements and the heat sink.

[0038] Each half of the cooling structure is, for example, Cast nonmagnetic metal, Cast nonmagnetic aluminum, or It can be made from cast non-magnetic aluminum alloy. The fabrication of each half of the cooling structure by casting allows for the creation of a shape specific to the user. Increase heat dissipation, The manufacturing cost of electromagnetic devices can be reduced, and / or Makes assembly easy / simplifies. Preferably, each half of the cooling structure has a shape that can be manufactured using a mold consisting of two parts.

[0039] Alternatively, each half of the cooling structure is Non-magnetic metals produced by extrusion manufacturing, Non-magnetic aluminum produced by extrusion manufacturing, or Non-magnetic aluminum alloy manufactured by extrusion in a direction perpendicular to the central axis It can be made with. In this case, the heat transfer element portion of each half of the cooling structure is a single plate or multiple plates parallel to each other, while the heat transfer element portions of the two halves of the cooling structure are parallel or perpendicular to each other.

[0040] Manufacturing each half of a cooling structure using the extrusion method significantly increases production speed, reduces manufacturing costs, and enables high dimensional accuracy in the finished product. In this case, the cooling structure has a constant cross-section along its entire length, or a constant cross-section along its entire length by removing a portion of it through milling.

[0041] Aluminum and many aluminum alloys are non-magnetic materials and have high thermal conductivity.

[0042] According to the present invention, the heat sink is the housing or part of the housing of an electromagnetic device. Thereafter, the electromagnetic device is housed in a housing, generally a rigid housing for its protection, and the entire housing or part thereof constitutes a heat sink, with the heat transfer elements in close contact with the housing or part thereof. The walls of the housing dissipate heat, and the walls are therefore part of the cooling structure.

[0043] According to one embodiment of the present invention, the heat transfer composition encloses a magnetic core and a coil wound around the magnetic core. The heat transfer composition is also in close contact with one side of the heat sink and transfers heat from the heat transfer composition to the heat sink. Preferably, the opposite side is not covered for heat dissipation. If the heat sink is a housing or part of a housing, the heat transfer composition is housed within the housing. Preferably, it is injected therein.

[0044] Preferably, the heat-conducting composition comprises a mixture of a silicone resin and a first filler, or a mixture of a silicone resin and a first filler containing a natural mineral filler. Optionally, the heat-conducting composition further comprises a second filler containing aluminum hydroxide.

[0045] In a further embodiment, the magnetic core further includes a gap perpendicular to the slit, thereby improving the magnetic properties of the magnetic core. The gap completely divides each portion of the magnetic core into two distinct parts.

[0046] The magnetic core includes, for example, a central region that is elongated in a prism or cylindrical shape parallel to the central axis. The coil is wound around the central region. The central region of the magnetic core is divided by a slit.

[0047] As an option, the magnetic core further includes a frame region surrounding a central opening. This central region of the magnetic core is contained within the central opening. The central opening is connected to the frame regions on both ends, dividing the central opening into two. The frame region of the magnetic core is also divided by the slit.

[0048] The coil is wound around a bobbin into which the magnetic core is inserted.

[0049] References to geometric positions such as parallel, perpendicular, and tangent lines are permitted with an error of up to ±5° from the theoretical position as defined herein. Any of the values ​​within the above range may not be extremely optimal. Adaptation of the present invention to these extreme values ​​may be necessary, and such applications are readily conceivable to those skilled in the art. [Brief explanation of the drawing]

[0050] [Figure 1] A perspective view of the electromagnetic device of the first embodiment of the present invention, with the cooling structure omitted. [Figure 2] An exploded perspective view of the electromagnetic device shown in Figure 1, including the cooling structure. This cooling structure is formed by a lower part of a housing to which plates are connected and an upper part of a housing to which other plates are connected, and the inside of the housing is filled with a heat-conducting composition. [Figure 3] A perspective view of an electromagnetic device according to a second embodiment of the present invention. The magnetic core is divided by a slit 11 parallel to the central axis and a gap 12 perpendicular to the central axis. The figure omits the cooling structure and heat transfer composition. [Figure 4] Assembly diagram of the electromagnetic device shown in Figure 3, including the cooling structure and heat transfer composition. [Figure 5] An exploded perspective view of the electromagnetic device of Figure 4, which has a cooling structure divided into two halves. Each half includes a heat sink in heat transfer contact with a portion of a heat transfer element that is tightly inserted into a slit in the magnetic core. This heat sink is located on the opposing (opposite) side of the electromagnetic device and includes a heat transfer composition between the two heat sinks. [Figure 6]An exploded perspective view of an electromagnetic device of an alternative embodiment similar to Figure 5. Each half of the cooling structure contains a single plate, which is perpendicular to each other. The magnetic core contains two perpendicular slits, one vertical and one horizontal. [Figure 7] An exploded perspective view of an electromagnetic device of an alternative embodiment similar to Figure 5. Each half of the cooling structure includes two plates parallel to each other and one plate perpendicular to the other plate, and the magnetic core includes two slits parallel to each other and one additional slit perpendicular to these two slits. [Figure 8] An exploded perspective view of an electromagnetic device of an alternative embodiment similar to Figure 7. Each half of the cooling structure includes two slits perpendicular to each other. The lower half of the cooling structure includes two columnar thick sections parallel to the central axis of the heat transfer element, these columns attached to one end of the plate. This lower half further includes a cooling cavity (channel) through the heat sink and columns, generating active cooling of the cooling structure. [Figure 9] Figure 8 shows a vertical cross-sectional view of the heat transfer element, cut in the same plane as the central axis. [Figure 10] Figure 8 shows a vertical cross-sectional assembly of the heat transfer element, cut in the same plane as the central axis. [Figure 11] An exploded perspective view of an electromagnetic device of an alternative embodiment similar to Figure 8. Each half of the cooling structure includes a single plate. The lower half of the cooling structure includes four thickened sections in the shape of four pillars parallel to the central axis of the heat transfer element, on the four corner regions surrounding the magnetic core. These four pillars are attached to the edges of the plate via an external heat transfer element in between. The external heat transfer element is plate-shaped and perpendicular to the plate inserted into the slit of the magnetic core. This lower half further includes a heat sink and cooling channels through the pillars, generating active cooling of the cooling structure. [Modes for carrying out the invention]

[0051] In Figure 2, the electromagnetic device of the present invention comprises a magnetic core 10, a coil 20 wound around the magnetic core 10 or a part thereof (around a central axis X), and a cooling structure 30 in close contact with the magnetic core 10.

[0052] The magnetic core 10 is formed by a plurality of independent magnetic core portions 10'. The magnetic core portions 10' face each other via opposing heat dissipation surfaces parallel to the central axis X. A slit 11 is formed between them.

[0053] In Figure 3, the magnetic core 10 is divided via a gap 12 perpendicular to the central axis X. This improves the magnetic behavior characteristics of the electromagnetic device.

[0054] For example, in the embodiments shown in Figures 1-5 and Figure 11, the magnetic core 10 includes a slit 11 parallel to the central axis X and a gap 12 perpendicular to the central axis, dividing the magnetic core 10 into four magnetic core portions 10'.

[0055] In the embodiments shown in Figures 6 and 8, the magnetic core includes two slits (orthogonal to each other) parallel to the central axis X and one gap perpendicular to the central axis, dividing the magnetic core 10 into eight magnetic core portions 10'.

[0056] In the embodiment shown in Figure 7, the magnetic core includes two slits parallel to each other, another slit perpendicular to these slits (all three slits are parallel to the central axis X), and one gap perpendicular to the central axis X, dividing the magnetic core 10 into 12 magnetic core portions 10'.

[0057] In all cases, the cooling structure 30 comprises two halves that overlap in the direction of the central axis X. Each half includes a single heat sink 32 that is in heat transfer contact with a portion of the heat transfer element 31. Each half of the cooling structure is a single metal element manufactured by one of the following methods: casting, extrusion, or integral welding.

[0058] The portion of the heat transfer element 31 that is tightly inserted into the slit 11 is plate-shaped. This plate is in close contact with the heat dissipation surface of each independent magnetic core portion 10'. That is, each main surface of the flat wall / plate is in close contact with one of the heat dissipation surfaces.

[0059] The non-magnetic heat transfer elements 31 of both halves of the cooling structure are prevented from contacting each other by a gap or insulator, thereby preventing electrical connection between the two halves of the cooling structure. This is done in the portion inserted into the magnetic core 10 and surrounded by the coil 20.

[0060] According to the embodiment shown in Figure 2, each half of the heat sink 32 has the shape of an open-topped box 30 having a plate 31. This box 30 forms part of the housing of the electromagnetic device. The plate 31 stands upright at its center perpendicular to the base of the housing. The plate 31 constitutes part of a non-magnetic heat transfer element inserted into the core.

[0061] In this embodiment, the electromagnetic device comprises two symmetrical cooling structures, each forming half of the housing. As a result, when the electromagnetic device is assembled, the housing is formed by the combination of the two heatsinks 32, completely enclosing the electromagnetic device.

[0062] According to the first embodiment (Figure 2), the housing is filled with a heat-conducting composition 40. This heat-conducting composition 40 surrounds the magnetic core 10 and the coil 20, and enhances heat transfer from the magnetic core 10 to the heat sink 32 via the heat-conducting composition 40.

[0063] In the second embodiment (Figure 4), each half of the cooling structure includes a heatsink 32 that forms only a bottom plate or a top plate. The heatsink 32 forms part of the housing when additional walls are attached, or it is simply a bottom plate or a top plate that supports all components of the electromagnetic device and facilitates its attachment to the support. This is done, for example, using screws in through holes provided in the bottom plate and top plate.

[0064] The plate also includes side walls parallel to the heat transfer element, but only on both sides thereof. The side walls provide a more secure enclosure than the simple bottom plate and can be manufactured together with the plate by an extrusion process.

[0065] According to the second embodiment, the heat transfer composition 40 is injected and molded between the heat sinks of the cooling structure 30 and cured.

[0066] As an optional feature, each half of the cooling structure includes a plate and two side walls parallel to this plate. The plate and two side walls of one half are perpendicular to the plate and two side walls of the other half. As a result, the two side walls of one half and the two side walls of the other half completely enclose the magnetic device between the four side walls and the two heat sinks. This allows each half to be manufactured inexpensively and easily by extrusion.

[0067] According to a preferred embodiment, the magnetic core 10 includes a central region. This central region is elongated in the direction of the central axis X, contained within a central opening of the frame region, and connected to the frame region by its ends. The coil 20 is wound around the central region, for example, around a bobbin 50, which is located between the coil 20 and the central region of the magnetic core 10.

[0068] The central region is a prism shape, such as a cylinder or cube. In all embodiments, the slit 11 divides the central region and the frame region in half vertically. In the first embodiment (Figure 2), the slit 11 divides the frame region into two C-shaped sections laterally. In the second embodiment (Figures 4 and 5), the slit 11 divides the frame region into two thinner frames longitudinally. Each half of the heat transfer element is E-shaped and is inserted not only into the central region of the magnetic core but also between the thinner frames. In this case, each half of the heat transfer element 31 has an upper edge that is separated from the heat sink 32 connected to it. The E-shape has one central protrusion and two side protrusions, one above and one below. The central protrusion is inserted into the central region of the magnetic core, and the side protrusions are inserted into the frame region of the magnetic core, separated from the central region.

[0069] In both embodiments, the gap 12 divides the central region and the frame region in half horizontally.

[0070] The non-magnetic heat transfer element 31 may include a cooling channel connected to a cooling circuit including a cooling liquid pump.

[0071] The cooling channels are formed either within the heat sink or within a portion of the nonmagnetic heat transfer element 31 in one half of the cooling structure 30, or both. For example, in the embodiments shown in Figures 8 and 11, only the lower half of the cooling structure includes the cooling circuit, but similar or symmetrical configurations can also be included in which both halves include the cooling channels.

[0072] At least some of the cooling channels can also be formed within a plate inserted into the slit 11 (when it is sufficiently thick), or they can be formed within an external heat transfer element that is in heat transfer contact with a plate tightly inserted into the slit 11.

[0073] For example, it has been proposed to provide a cooling channel in the thicker portion of the external heat transfer element, which is thicker than the plate inserted into the slit 11 of the magnetic core 10.

[0074] The aforementioned thickened portion is formed as a column as shown in Figures 8 and 11, and is either directly in heat transfer contact with the edge of the plate inserted into the slit of the magnetic core 10 (Figure 8), or is in heat transfer contact via an external heat transfer element that is also formed as a plate perpendicular to the plate inserted into the slit 11 (Figure 11).

[0075] As shown in Figures 9 and 10, the cooling channel includes multiple parallel lumens 61 and a lateral hole. This lateral hole intersects with the multiple parallel lumens 61 and interconnects them.

[0076] Preferably, at least some of the lumens 61 are open holes with no bottoms. These lumens 61 are generally formed parallel to the central axis X on the portion of the heat transfer element 31 of at least one half of the cooling structure 30. Each lumen 61 has a central plate 63. This central plate 63 is inserted into the lumen 61 and connected, for example, by a screw member to a cap attached to the open end of each lumen 61. The central plate 63 divides the lumen 61 into two channels in the longitudinal direction and forms a connection between the two channels at the bottom of the lumen 61 (upward in Figure 9), providing a cooling effect along the entire length of the lumen 61.

[0077] The central plate 63 is generally shorter than the depth of the lumen 61 into which it is inserted, or has a lateral opening at its distal end, forming two parallel channels in each lumen 61. One of these channels is connected to one segment of the lateral lumen, and the other to the other segment of the lateral lumen, allowing the cooling fluid to flow toward the bottom of each lumen 61.

[0078] In the embodiment shown in Figures 9 and 10, the unpenetrated lumen 61 passes through the lower heat sink 32, and the open end on one side of the heat sink 32 faces the side of the heat sink 32 connected to the heat transfer element 31. The parallel lumen 61 align with each other and intersect with the transverse hole 62 in the region adjacent to their open ends. In this embodiment, the transverse hole 62 is coplanar with the parallel lumen 61 and perpendicular to it. The transverse hole 62 intersects the heat sink 32 attached to it completely.

[0079] The above description relates to one embodiment of the present invention, and those skilled in the art may conceive of various modifications of the present invention, all of which are included within the technical scope of the present invention. The numbers in parentheses following the components of the claims correspond to the part numbers in the drawings and are provided for the ease of understanding the invention and should not be used to restrict the interpretation of the invention. Furthermore, the part names in the specification and the claims are not necessarily the same even if they have the same number. This is for the reasons stated above. Regarding the term "or," for example, "A or B" includes selecting "A only," "B only," or "both A and B." Unless otherwise specified, the number of devices or means may be singular or plural.

Claims

1. In an electromagnetic device with improved cooling function, It has a magnetic core (10) and a cooling structure (30), *The magnetic core (10) has a coil (20) wound around a central axis (X), The magnetic core (10) has a slit (11) parallel to the central axis (X), and the slit (11) divides the magnetic core (10) into a plurality of magnetic core portions (10'), * The cooling structure (30) comprises a heat transfer element (31) and a heat sink (32) that makes heat transfer contact with the heat transfer element (31), the heat transfer element (31) having a flat plate made of a non-magnetic metal, the plate being inserted into the slit (11), * The cooling structure (30) is divided into two halves that overlap or face each other in the direction of the central axis (X), and each half has the heat sink (32) and a part of the heat transfer element (31), and the heat transfer element (31) is in heat transfer contact with the corresponding heat sink (32). * The induced current flowing through the cooling structure (30) is blocked by the air gap or insulator. The aforementioned gap or insulating material is * Between the portion of the heat transfer element (31) surrounded by the coil (20), * Between the portion of the cooling structure (30) that surrounds the coil (20) Formed or disposed on either one or both of them An electromagnetic device characterized by improved cooling function.

2. The multiple heat transfer elements (31) are either parallel to each other, or orthogonal to each other, or both. The electromagnetic device according to claim 1, characterized by its features.

3. The heat sink (32) is either a surrounding body (40) that houses the magnetic core (10) or a part of the surrounding body (40). The electromagnetic device according to claim 1, characterized by its features.

4. The heat transfer element (31) further includes a heat-transferring external element, The heat-conducting external element is made of a non-magnetic material and is in heat-transferring contact with the heat sink (32) adjacent to the outside of the magnetic core (10), and / or A plate-shaped heat transfer element (31) inserted into the slit (11) of the magnetic core (10) makes heat transfer contact. The electromagnetic device according to claim 1, characterized by its features.

5. The aforementioned half is * A single item made of metal casting, aluminum casting, or aluminum alloy casting, *This is a single product made from metal extruded products, aluminum extruded products, or aluminum alloy extruded products. The extruded product is formed by extruding it in a direction perpendicular to the direction of the central axis. The electromagnetic device according to claim 1, characterized by its features.

6. The aforementioned half is * A single item made of metal casting, aluminum casting, or aluminum alloy casting, *This is a single product made from metal extruded products, aluminum extruded products, or aluminum alloy extruded products. The extruded product is formed by extruding it in a direction perpendicular to the direction of the central axis. The two semi-slab-shaped heat transfer elements (31) are perpendicular to each other. The electromagnetic device according to feature 4.

7. Each half of the cooling structure (30) has two side plates, The side plate is arranged parallel to the plate-shaped heat transfer element (31) and is adjacent to the outside of the magnetic core (10). The electromagnetic device according to claim 6, characterized by the features described above.

8. The magnetic core (10) and coil (20) are embedded in the heat-conducting composition (40). The heat-transferring composition (40) is in heat-transferring contact with each of the heat sinks (32). The electromagnetic device according to claim 1, characterized by its features.

9. The heat transfer composition (40) is * A mixture containing silicone resin and a first filler of natural mineral fillers, or * A mixture containing silicone resin, a first filler made of natural mineral filler, and a second filler made of aluminum oxide. including The electromagnetic device according to claim 8.

10. The magnetic core (10) has a gap (12), and the gap (12) is * perpendicular to the central axis (X), and enhancing the magnetic performance of the magnetic core (10), * Dividing the magnetic core (10) into two parts of the magnetic core portion (10') The electromagnetic device according to claim 1, characterized by its features.

11. The coil (20) is wound around the bobbin (50), The bobbin (50) is positioned between the coil (20) and the magnetic core portion (10'). The electromagnetic device according to claim 1, characterized by its features.

12. The cooling structure (30) further includes a cooling channel (61) connected to the cooling circuit. The electromagnetic device according to claim 1, characterized by its features.

13. The cooling channel (61) is *Inside the heat sink (32), or * Within the portion of at least one of the heat transfer elements (31) of the cooling structure (30) It is formed in either or both of the following ways The electromagnetic device according to claim 12, characterized by its features.

14. The cooling channel has a plurality of parallel-arranged channels (61) and lateral channels perpendicular to the parallel-arranged channels (61). The parallel-arranged channels (61) and the lateral channels intersect. The electromagnetic device according to claim 12 or 13, characterized in that it is as described above.

15. At least a portion of the parallel-arranged channels (61) is a bottomed hole formed within a portion of at least one of the heat transfer elements (31) of the cooling structure (30), and has a partition plate (63). The partition plate (63) vertically divides the bottomed holes of the two parallel-arranged channels (61), The connection between these two parallel-arranged channels (61) is formed at the bottom of the bottomed hole. The electromagnetic device according to claim 14, characterized by its features.

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