Core element for an inductive component, and inductive component

Abstract

A core element (1) for an inductive component (10) comprises at least one winding leg (2) configured to receive at least one winding (11), and at least one through-hole (3) through the winding leg (2). The through-hole (3) at least partially penetrates the winding leg (2) in a first direction (100) parallel to a main extension direction of the winding leg (2). An interface between an internal space of the through-hole (3) and the core element (2) is configured as part of a cooling surface of the core element (1). Furthermore, an inductive component (10) is specified.

Description

[0001] P2024, 0849 WO N August 13, 2025

[0002] 1

[0003] Description

[0004] Core element for an inductive component, and inductive component

[0005] The present disclosure relates to a core element for an inductive component and to an inductive component.

[0006] Inductive components such as power transformers typically include windings or coils on a core commonly comprising a ferromagnetic material. In AC applications three sources of losses, in particular in the form of heat, are dominant: the windings, the ferromagnetic core, and air gaps in the core due to fringing flux. With increasing operational frequency, the core losses can increase exponentially and, since the flux density is highest in regions of the core, where the windings are arranged, the area with the highest loss, i.e. heat generation, is typically not externally accessible for cooling means.

[0007] One object to be achieved, inter alia, is to specify an improved core element for an inductive component, which in particular has an increased cooling surface for efficient heat dissipation. Another object to be achieved, inter alia, is to specify an improved inductive component, in particular from which heat can be efficiently dissipated.

[0008] This object is achieved, inter alia, by a core element comprising the features of independent claim 1 and by an inductive component comprising the features of claim 16, respectively. Advantageous embodiments and further developments are the subject of the dependent patent claims. P2024 , 0849 WO N August 13 , 2025

[0009] 2

[0010] A core element for an inductive component is speci fied, which comprises at least one winding leg configured to receive at least one winding, and at least one through-hole through the winding leg . The through-hole at least partially penetrates the winding leg in a first direction parallel to a main extension direction of the winding leg . An interface between an internal space of the through-hole and the core element is configured as part of a cooling surface of the core element .

[0011] Preferably, the through-hole penetrates the winding leg completely . For example , viewed from a front surface or back surface of the core element , it is possible to see through the core element . The front surface and back surface of the core element are in particular perpendicular to the first direction . In other words , a normal vector of each of the front and back surfaces is parallel to the first direction .

[0012] For example , the core element comprises exactly one through- hole 3 through the winding leg .

[0013] The main extension direction of the winding leg is parallel to the first main surface . Thus , the main extension direction of the winding leg is in particular perpendicular to the front surface and side surface . A main extension plane of the winding leg may be perpendicular to the front surface and back surface .

[0014] In particular, the cooling surface is freely accessible from the outside . From the cooling surface heat of the core element may be dissipated, for example by using a cooling agent . The cooling agent may be air or an air flow . By extending the cooling surface to the winding leg via the P2024 , 0849 WO N August 13 , 2025

[0015] 3 through-hole , heat from the winding leg can be dissipated ef ficiently .

[0016] For example , the core element comprises a ferromagnetic material . In particular, the core element comprises a ferrite and / or iron .

[0017] The core element may comprise a plurality of legs . For example , the core element may comprise two side legs and the winding leg, wherein the winding leg is located between the side legs . The legs of the core element may be connected by a base and a top, which may be yokes of the core element . In this example , the core element may be a so-called PQ-core .

[0018] It is also possible that the core element comprises a plurality of winding legs and optionally side legs , between which the winding legs are arranged . Preferably, all winding legs are configured to receive one or more windings . Further preferably, all winding legs comprise a through-hole that completely penetrates the respective winding leg in the main extension direction . In particular, each winding leg comprises exactly one through-hole partially or completely penetrating the corresponding winding leg .

[0019] The winding leg or each winding leg may be configured to receive one or more windings . For example , around one winding leg two windings can be arranged . A first of the two windings may correspond to a primary side , and a second of the two windings may correspond to a secondary side of a power trans former . In this case , the core element may be a core element for a power trans former . P2024 , 0849 WO N August 13 , 2025

[0020] 4

[0021] In cases where the core element comprises a plurality of winding legs , the core element may be configured to be used in a coupled inductor or a power trans former .

[0022] It is also possible that the core element is used in a choke .

[0023] The core element described here is based on the following technical considerations . Common means for improving thermal management of inductive components , in particular for high- frequency applications , include reducing their loss . This may be achieved, for example , by using special ferromagnetic materials for the cores , using bigger cores in order to limit an operational flux density, using special winding wires for the windings , or increasing turns of the windings . However, these means increase costs , spatial dimensions and / or have other disadvantages such as increasing undesired fringing fluxes .

[0024] The core element described here makes use of the idea of increasing a cooling surface by penetrating the core element . Advantageously, the winding leg of the core element is penetrated, which typically is an area of the core element where the most heat is generated due to high fluxes . The through-hole generates an additional cooling surface directly at the winding leg that may be externally accessible . Thus , the core element can be passively or actively cooled, for example using a cooling agent , and heat can be ef ficiently dissipated from a maj or critical area with respect to thermal management .

[0025] Furthermore , since temperature di f ferences within the core element may cause internal mechanical stress that can impact the magnetic performance negatively . In particular, i f the P2024 , 0849 WO N August 13 , 2025

[0026] 5 core element comprises a material with a relatively low thermal conductivity such as ferrite , mechanical stress due to temperature di f ferences can occur . Thus , by providing a through-hole to add an additional cooling surface in the core element , the mechanical stability of the core element can be increased and the risk of decreasing magnetic properties due to mechanical stress can be reduced .

[0027] For example , air may flow through the through-hole , in particular due to a chimney ef fect . In particular, an orientation, diameter, and other geometric parameters may be adapted to increase the chimney ef fect . By the air flowing through the through-hole , heat may be dissipated .

[0028] According to at least one embodiment , the core element is formed as one piece . This means in particular, that all elements or components or parts of the core element is preferably formed with a common material and in a common method step .

[0029] According to at least one embodiment , at least the winding leg is formed in one piece . For example , the winding leg comprises a solid structure through which the though-hole runs . It is possible that the winding leg and other parts of the core element are formed in one piece in one process during production of the core element and subsequently the through-hole is formed in the winding leg . In case that the core element comprises a plurality of winding legs , preferably all winding legs are each formed as one piece .

[0030] According to at least one embodiment , the winding leg comprises exactly one through-hole at least partially penetrating the winding leg in the first direction . In case P2024 , 0849 WO N August 13 , 2025

[0031] 6 that the core element comprises a plurality of winding legs , preferably each of the winding legs comprises exactly one through-hole penetrating the corresponding winding leg in the first direction .

[0032] According to at least one embodiment of the core element , a filling material is arranged in the through-hole . In particular, the filling material directly contacts the core element . However, it is also possible that an adhesive layer or the like is arranged between the filling material and the core element to fix the filling material in the through-hole .

[0033] Preferably, the filling material has a heat conductivity that is larger than the heat conductivity of the material of the core element and / or air . This means that heat may be ef ficiently dissipated from the core element using the filling material .

[0034] The filling material may completely fill the through-hole .

[0035] The filling material may be directly accessible from an external environment of the core element . In particular, the filling material may be coupled to an external heat sink or cooling system .

[0036] The filling material may be a potting material or a ceramic material or any other suitable material having a high heat conductivity . I f the filling material is a ceramic material , the ceramic material may be magnesium-oxid or aluminium-oxid, for example .

[0037] For example , i f the filling material is a potting material , the core element may be molded in the potting material to protect the core element and / or the inductive component from P2024 , 0849 WO N August 13 , 2025

[0038] 7 external influences . This may be of particular advantage i f the core element is used together with a water-cooling element . For example , the potting material is a silicon resin .

[0039] Preferably, the filling material is free of a metal . In particular, the filling material is a non-metallic material and further preferably a non-magnetic material . For example , the filling material is free of metal and preferably free of iron . By using non-magnetic materials , preferably a nonmagnetic filling material , magnetic properties of the core element may essentially not change or change only slightly when using the filling material .

[0040] It is also possible that the filling material comprises a metal such as aluminium and / or copper .

[0041] According to at least one embodiment of the core element comprising a filling material , the filling material terminates flush with the front surface and / or the back surface of the core element , in particular in the first direction and / or a direction opposite to the first direction . This means in particular that the filling material does nor proj ect beyond the through-hole in the first direction and / or the direction opposite to the first direction .

[0042] In particular in cases where the filling material completely fills the through-hole , a length of the filling material , measured in the first direction, and a length of the through- hole , measured in the first direction, are identical or essentially identical . P2024 , 0849 WO N August 13 , 2025

[0043] 8

[0044] According to an alternative embodiment of the core element comprising a filling material , the filling material proj ects beyond the front surface and / or the back surface of the core element , in particular in the first direction and / or the direction opposite to the first direction . This means that the filling material extends outside of the through-hole in the first direction and / or a direction opposite to the first direction .

[0045] In particular in cases where the filling material completely fills the through-hole , a length of the filling material , measured in the first direction, is larger than a length of the through-hole , measured in the first direction .

[0046] By letting the filling material proj ect beyond the front and / or back surface of the core element , the filling material may easily be connected to a cooling system or an external heat sink or the like .

[0047] According to at least one embodiment of the core element , a pipe is arranged in the through-hole . The pipe is in particular configured to guide a cooling agent through the through-hole . The cooling agent may be air or water or another suitable gas or liquid . The pipe may be connected to a cooling system or a cooling circuit , for example comprising a pump for pumping the cooling agent through the pipe .

[0048] In particular, the pipe and thus the through-hole completely penetrate the winding leg in this embodiment . The pipe preferably directly contacts the core element . However, it is also possible that an adhesive layer or the like is arranged between the pipe and the core element to fix the pipe in the P2024 , 0849 WO N August 13 , 2025

[0049] 9 through-hole . By guiding a cooling agent through the through- hole , heat dissipation can be further increased .

[0050] Preferably, the pipe comprises a comparably small wall thickness . By choosing a comparably small wall thickness , an influence of the pipe on the magnetic properties of the core element can be reduced . Furthermore , a thermal coupling between the cooling agent flowing in the pipe and the core element can be increased .

[0051] Further preferably, the pipe is free of magnetic material . In particular, the pipe does not comprise a ferromagnetic material . It is possible that the pipe comprises a metal . By using non-magnetic materials for the pipe , an influence of the pipe on the magnetic properties of the core element can be further reduced .

[0052] According to at least one embodiment of the core element , a cross-sectional area of the through-hole comprises a circular contour . The cross-sectional area is determined in a crosssection perpendicular to the first direction . By choosing a circular contour of the through-hole advantageously, the inductive component comprising the through-hole may be particular easy to manufacture .

[0053] According to an alternative embodiment of the core element , the cross-sectional area of the through-hole comprises a polygonal-shaped contour . For example , the through-hole may comprise a contour of a triangle , a rectangle , a pentagon, a hexagon, an octagon, or a dodecagon . Advantageously, by such a through-hole with a polygonal-shaped a particular large cooling surface can be generated in the winding leg . P2024 , 0849 WO N August 13 , 2025

[0054] 10

[0055] For example , the core element has a geometric volume of at least 5 , 000 mm^ . it is possible that the geometric volume is at least 10 , 000 mm^ or at least 20 , 000 mm^ or at least 35 , 000 mm^ . po rexample , a length of the winding leg, measured in the first direction, is at least 30 mm or at least 50 mm or at least 70 mm or at least 100 mm .

[0056] Since a magnetic material of the core element comprises a comparably small thermal conductivity . Thus , for an inductive component with such a comparably large core and / or such a long winding leg, the advantage of providing an additional cooling surface by the through-hole is particularly beneficial . In general , the benefit of providing an additional cooling surface by the through-hole may be higher, the bigger the volume of the core element and / or the longer the winding leg .

[0057] According to at least one embodiment , a cross-sectional area of the through-hole is at least 1 % or preferably at least 5% or further preferably at least 10% of a cross-sectional area of the winding leg . A sectional plane corresponding to the cross-sectional area in particular is perpendicular to the main extension direction of the winding leg .

[0058] For example , the winding leg may have a round or annular cross-sectional area with an outer diameter of around 20 mm, resulting in a cross-sectional area of around 314 mm2 . this example , the through-hole may be circular with a diameter of around 5 mm, resulting in a cross-sectional area of the through-hole of around 20 mm2 . ThUS / the cross- sectional area of the through hole may be around 6% of the cross-sectional area of the winding leg . However, i f the P2024 , 0849 WO N August 13 , 2025

[0059] 11 winding leg comprises , for example , a length of 50 mm, the additional cooling surface provided by the through-hole is around 785 mm2 .

[0060] In particular, i f the through-hole is being considered during the design of the core element and incorporated into it , the disadvantageous ef fect of the loss of a magnetic crosssection can be easily counter measured . In the particular case above the outer diameter of the winding leg should be increased by 0 . 6 mm .

[0061] It is advantageous even possible to further increase the cooling surface i f the cross-sectional area of the through- hole comprises a polynomial contour . For example , i f , deviating from the above example , the through-hole may comprise a contour of a square with a cross-sectional area of around 20 mm2 , the additional cooling surface provided by the through hole is around 895 mm2 . particular, it is in general of particular advantage to maximi ze a perimeter of the cross-sectional area, i f the cross-sectional area is fixed .

[0062] According to at least one embodiment of the core element , the winding leg comprises a gap completely penetrating the winding leg in a second direction perpendicular to the first direction . By the gap commonly operational fluxes in the core element can be adj usted . However, the gap may also be a source for losses .

[0063] In particular, the gap is connected to the through-hole . This means in particular that by the gap the cooling surface of the winding leg can be further increased, since via the through-hole the gap may be externally accessible . P2024, 0849 WO N August 13, 2025

[0064] 12

[0065] If a filling material is arranged in the through-hole, the filling material may also be arranged in the gap. If a gap is present, the filling material is preferably free of a metal.

[0066] Furthermore, an inductive component is specified. The inductive component may comprise a core element specified here in accordance with one or more embodiments described above. Thus, all features disclosed for the core element are also disclosed for the inductive component and vice versa.

[0067] According to at least one embodiment of the inductive component, the inductive component comprises a core element described herein in accordance with one or more of the embodiments described above, wherein at least one winding or coil is wound around the at least one winding leg.

[0068] The winding may comprise N turns, where N is a natural number greater than or equal 1. The winding may comprise an electrically conductive material, preferably copper or aluminium. During operation, an operational current is applied to the winding.

[0069] If, for example, the inductive component is a transformer, the inductive component comprises two windings. Both windings may be wound around the same winding leg. It is also possible that each winding is wound around an individual winding leg. A first winding of the two windings comprises, for example, N turns and a second winding of the two windings comprises, for example, M turns. N and M may be different natural numbers. The first winding may be connected to a primary side of a circuit and the second winding may be connected to a secondary side of a circuit. By magnetically coupling the two P2024, 0849 WO N August 13, 2025

[0070] 13 windings via the core, a voltage may be transformed from a primary voltage to a secondary voltage.

[0071] Other possible applications for the inductive component include chokes, coupled inductors, and DC-DC converters, but are not limited thereto.

[0072] According to at least one embodiment of the inductive component, the core element is arranged in a housing and is at least partially surrounded by a potting material. The housing comprises, for example, a metal such as aluminum. The housing may be hermetically sealed. For example, the inductive component can be used in combination with a fluidcooling element. The fluid-cooling element may comprise a cooling agent such water or other suitable fluids. Preferably, the inductive component is mounted on a watercooling element for heat dissipation. Such a fluid-cooling or water-cooling element may be used if the inductive component is applied in a car.

[0073] Between the housing and the core element, the potting material may be arranged at least in places. The potting material is, for example, a resin such as a silicon resin.

[0074] In particular, a filling material is arranged in the through- hole. The filling is preferably in contact with the housing. The filling material may thus provide a heat conducting path for dissipating heat from the winding leg to the housing. Form the housing heat may be efficiently dissipated by a cooling system of the application.

[0075] For example, the potting material may be arranged in the through-hole as the filling material. Additionally or P2024 , 0849 WO N August 13 , 2025

[0076] 14 alternatively, a ceramic material may be arranged in the through-hole as the filling material . The ceramic material is magnesium-oxide or aluminium-oxide , for example .

[0077] According to at least one embodiment of the inductive component , a cooling system is configured to let a cooling agent flow through the through-hole . The cooling system may be part of the inductive component or may be an external cooling system or a combination thereof . This means that the cooling system may comprise parts that are part of the inductive component and parts that are part of an external application .

[0078] The cooling agent may be air, water or another suitable gas or liquid by which heat can be ef ficiently dissipated .

[0079] The cooling system may comprise a pump, a fan and / or a cooling circuit , by which the cooling agent can be guided through the through-hole .

[0080] For example , the cooling system comprises a pipe arranged in the through-hole . The pipe may be configured to guide the cooling agent through the through-hole . The pipe can be part of a cooling circuit and is , for example , connected to a pump or a fan of the cooling system .

[0081] Preferably, the housing of the inductive component comprises at least one opening that directly adj oins the pipe . This means in particular that the pipe is accessible from the outside via the opening . In particular, the housing comprises at least two openings adj oining two opposite ends of the pipe to allow the cooling agent to flow through the pipe . P2024 , 0849 WO N August 13 , 2025

[0082] 15

[0083] Further advantages and advantageous embodiments and further developments of the core element and the inductive component described herein will become apparent from the following exemplary embodiments shown in connection with schematic drawings . Identical elements , elements of the same kind or elements having the same ef fect are provided with the same reference signs in the figures . The figures and the proportions of the elements shown in the figures are not to be regarded as true to scale . Rather, individual elements may be shown exaggeratedly large for better representability and / or for better comprehensibility .

[0084] In the figures :

[0085] Figure 1 shows a front view of a core element described herein according to a first exemplary embodiment ;

[0086] Figure 2 shows a sectional view of the core element according to the first exemplary embodiment ;

[0087] Figures 3 and 4 show sectional views of core elements described herein according to further exemplary embodiments ;

[0088] Figures 5 to 8 show sectional views of inductive components described herein according to exemplary embodiments .

[0089] The core element 1 according to the first exemplary embodiment as shown in Figures 1 and 2 , wherein Figure 2 shows a sectional view along the section line A-A in Figure 1 , comprises a winding leg 2 located between two side legs P2024 , 0849 WO N August 13 , 2025

[0090] 16

[0091] 21 . The winding leg 2 is configured to receive at least one winding 11 ( cf . Figure 5 ) .

[0092] The winding leg 2 and the side legs 21 are connected by a front yoke 22 and a back yoke 23 . An outwardly exposed surface of the front yoke 22 is a front surface 5 of the core element 1 and an outwardly exposed surface of the back yoke 23 is a back surface 6 of the core element 1 . The front surface 5 and the back surface 6 are opposite to each other .

[0093] The core element 1 comprises a ferromagnetic material such as ferrite or iron . The core element 1 and / or at least the winding leg 2 is preferably formed as one piece .

[0094] The core element 1 comprises a through-hole 3 completely penetrating the winding leg 2 in a first direction 100 perpendicular to the front surface 5 and the back surface 6 . The through-hole 3 has a circular contour ( cf . Figure 1 ) . Preferably, the core element 1 comprises exactly one through- hole 3 penetrating the winding leg 2 in the first direction 100 .

[0095] By the through-hole 3 a cooling surface 20 of the core element 1 can be increased . For example , air can flow in the through-hole 3 , and heat from the winding leg 2 can be dissipated . An interface between the through-hole 3 and the core element 1 , i . e . the winding leg 2 , is part of the cooling surface 20 .

[0096] During operation of an inductive component 10 comprising the core element 1 , particularly high fluxes occur at the winding leg 2 since the winding 11 is arranged at the winding leg 2 . As the material of the core element 1 has a relatively bad P2024 , 0849 WO N August 13 , 2025

[0097] 17 thermal conductivity, heat cannot be ef fectively dissipated from the winding leg via the core element 1 . Thus , by increasing the cooling surface 20 at the winding leg 2 , thermal management of the core element 1 can be signi ficantly improved .

[0098] The winding leg 2 comprises a gap 8 penetrating the winding leg 2 in a second direction 200 . The second direction 200 is perpendicular to the first direction 100 . By the gap 8 the cooling surface 20 is advantageously further increased .

[0099] In contrast to the first exemplary embodiment , the second exemplary embodiment of the core element , shown in Figure 2 , comprises a filling material 4 filling the through-hole 3 .

[0100] The filling material 4 has a higher thermal conductivity than the core element 1 . The filling material 4 is free of a metal such that magnetic properties of the core element 1 are essentially not af fected by the filling material 4 . The filling material 4 is a ceramic material such as MgO .

[0101] The filling material 4 is flush with the front surface 5 and the back surface 6 in the first direction 100 and a direction opposite to the first direction 100 . Hence , the filling material 4 does not proj ect beyond the core element 1 . The filling material 4 has essentially the same length as the through-hole 3 , measured along the first direction .

[0102] By the filling material 4 , heat can be ef ficiently dissipated from the winding leg 2 .

[0103] In contrast to the second exemplary embodiment as shown in Figure 3 , the filling material of the core element 1 according to the third exemplary embodiment shown in Figure 4 P2024 , 0849 WO N August 13 , 2025

[0104] 18 fills the gap 8 . Thus , heat dissipation from the winding leg 2 can be further increased .

[0105] Figure 5 shows a schematic cross-section of an inductive component 10 described here according to a first exemplary embodiment . A sectional plane of the cross-section is similar to the cross-sectional plane of Figures 2 to 4 .

[0106] The inductive component 10 comprises a core element 1 . The core element 1 is in particular the core element 1 according to the third exemplary embodiment described above . Thus , the core element 1 of the inductive component 10 comprises all features of the core element 1 according to the third exemplary embodiment . It is also possible to use a core element 1 according to any of the other exemplary embodiments described above .

[0107] The inductive component 10 comprises a winding 11 wound around the winding leg 2 . It is also possible that more than one winding 11 is arranged at the winding leg 2 . However, for the sake of illustration, only one winding 11 is shown in Figure 5 .

[0108] The winding 11 has N turns and comprises copper . During operation of the inductive component 10 the winding 11 is supplied with current . Thereby, a magnetic flux is generated in the core element 11 . Since the magnetic flux is particularly large at the winding leg 2 , heat is generated there . By using the core element 1 described herein, which comprises the through-hole 3 , for the inductive component 10 , this heat can be ef ficiently dissipated . P2024 , 0849 WO N August 13 , 2025

[0109] 19

[0110] The core element 1 and the winding 11 are arranged in a housing 12 of the inductive component 10 . The housing 12 comprises a metal such as aluminium . The housing 12 is preferably hermetically sealed and protects the inductive component 10 from an external environment , which may be a water-cooled environment , depending on the type of application .

[0111] Between the housing 12 and the core element 1 , a potting material 13 is arranged . The potting material 13 is , for example , a silicon resin . The potting material 13 fixes the core element 1 in the housing 12 and of fers further environmental protection .

[0112] The potting material 13 extends in the through-hole 3 and the gap 8 of the core element 1 as a filling material 4 . The filling material 4 / potting material 13 directly contacts the housing 12 . Therefore , the potting material 13 provides a heat conducting path for heat generated during operation from the core element 1 to the housing 12 . The housing 12 may be connected to an external cooling system and / or a heat sink such that heat can be ef ficiently dissipated .

[0113] In contrast to Figure 5 , the inductive component 10 according to the exemplary embodiment shown in Figure 6 comprises a ceramic material such as MgO as the filling material 4 . Furthermore , for the sake of illustration, the winding 11 is not shown in the representation of Figure 6 but is still present .

[0114] The filling material 4 proj ects beyond the core element 1 , in particular beyond the front surface 5 and back surface 6 and is in direct contact with the housing 12 . P2024 , 0849 WO N August 13 , 2025

[0115] - 20 -

[0116] Preferably, the ceramic material has a higher heat conductivity than the potting material 13 . Thus , heat can be transported to the housing 12 more ef ficiently .

[0117] In contrast to the exemplary embodiment shown in Figure 6 , the filling material 4 of the inductive component 10 according to the exemplary embodiment shown in Figure 7 fills the gap 8 . Thus , heat dissipation from the winding leg 2 can be further increased .

[0118] In contrast to Figure 5 , the inductive component 10 according to Figure 8 comprises a pipe 7 arranged in the through-hole 3 . In Figure 8 the winding 11 is not shown for illustration purposes .

[0119] The pipe 7 extends in the first direction 100 from a first opening 15 of the housing 12 to a second opening 16 of the housing 12 opposite to the first opening 15 , and through the through-hole 3 .

[0120] Through the pipe 7 a cooling agent 14 is guided through the through-hole 3 . The cooling agent 14 is air or water or any other gas or liquid suitable for dissipating heat from the winding leg 2 .

[0121] The pipe 7 may be part of a cooling system for the inductive component or may be connected to an external cooling system . The cooling system may comprise a pump or a fan configured to let the cooling agent 14 flow through the pipe 7 .

[0122] The pipe 7 comprises a non-magnetic material , preferably a non- f erromagnetic material . The pipe 7 may comprise a P2024 , 0849 WO N August 13 , 2025

[0123] 21 suitable metal . A wall thickness of the pipe 7 is comparably small such that the pipe 7 has only little impact on magnetic properties of the core element 1 . The invention is not restricted to the exemplary embodiments by the description on the basis of said exemplary embodiments . Rather, the invention encompasses any new feature and also any combination of features , which in particular comprises any combination of features in the patent claims and any combination of features in the exemplary embodiments , even i f this feature or this combination itsel f is not explicitly speci fied in the patent claims or exemplary embodiments .

[0124] P2024 , 0849 WO N August 13 , 2025

[0125] - 22 -

[0126] References

[0127] 1 core element

[0128] 2 winding leg

[0129] 3 through-hole

[0130] 4 filling material

[0131] 5 front surface

[0132] 6 back surface

[0133] 7 pipe

[0134] 8 gap

[0135] 10 inductive component

[0136] 11 winding

[0137] 12 housing

[0138] 13 potting material

[0139] 14 cooling agent

[0140] 15 first opening

[0141] 16 second opening

[0142] 20 cooling surface

[0143] 21 side leg

[0144] 22 front yoke

[0145] 23 back yoke

[0146] 100 first direction

[0147] 200 second direction

[0148] A-A section line

Claims

P2024, 0849 WO N August 13, 2025- 23 -Claims1. Core element (1) for an inductive component (10) , comprising at least one winding leg (2) configured to receive at least one winding (11) , and at least one through-hole (3) through the winding leg (2) , wherein the through-hole (3) at least partially penetrates the winding leg (2) in a first direction (100) parallel to a main extension direction of the winding leg (2) , and an interface between an internal space of the through- hole (3) and the core element (1) is configured as part of a cooling surface (20) of the core element (1) .

2. Core element (1) according to claim 1, wherein a filling material (4) is arranged in the through-hole (3) so as to directly contact the core element (1) .

3. Core element (1) according to claim 2, wherein the filling material (4) is free of a metal.

4. Core element (1) according to claims 2 or 3, wherein the filling material (4) terminates flush with a front surface (5) and / or back surface (6) of the core element (1) •5. Core element (1) according to claim 2 or 3, wherein the filling material (4) projects beyond a front surface (5) and / or back surface (6) of the core element (1) .

6. Core element (1) according to one of the preceding claims, wherein the core element (1) comprises exactlyP2024, 0849 WO N August 13, 2025- 24 - one through-hole (3) at least penetrating the winding leg (2) in the first direction (100) .

7. Core element (1) according to one of the preceding claims, wherein a pipe (7) is arranged in the through- hole (3) , and the pipe (7) is configured to guide a cooling agent (14) through the through-hole (3) .

8. Core element (1) according to claim 7, wherein the pipe (7) is free of magnetic materials.

9. Core element (1) according to one of the preceding claims, wherein a cross-sectional area of the through- hole (3) comprises a circular contour.

10. Core element (1) according to one of claims 1 to 8, wherein a cross-sectional area of the through-hole (3) comprises a polygonal-shaped contour.

11. Core element (1) according to one of the preceding claims, wherein a length of the winding leg (2) is at least 30 mm.

12. Core element (1) according to one of the preceding claims, wherein a cross-sectional area of the through- hole (3) is at least 1% of a cross-sectional area of the winding leg ( 2 ) .

13. Core element (1) according to one of the preceding claims, wherein the winding leg (2) comprises a gap (8) completely penetrating the winding leg (2) in a second direction (200) perpendicular to the first direction (100) .P2024, 0849 WO N August 13, 2025- 25 -14. Core element (1) according to claim 13, wherein the gap (8) is connected to the through-hole (3) .

15. Core element (1) according to claim 13 or 14, wherein the gap (8) is filled with a filling material (4) .

16. Inductive component (10) comprising a core element (1) according to one of the preceding claims, wherein at least one winding (11) is wound around the at least one winding leg ( 2 ) .

17. Inductive component (10) according to claim 16, wherein the core element (1) is arranged in a housing (12) and is at least partially surrounded by a potting material (13) .

18. Inductive component (10) according to claim 16, wherein a filling material (4) is arranged in the through-hole (3) , the filling material (4) is in contact with the housing ( 12 ) , and the filling material (4) is the potting material (13) or a ceramic material.

19. Inductive component (10) according to claim 16 or 17, wherein a cooling system is configured to let a cooling agent (14) flow through the through-hole (3) .

20. Inductive component (10) according to claim 19, wherein the cooling system comprises a pipe (7) arranged in the through-hole (3) , and the pipe (7) is configured to guide the cooling agent (14) through the through-hole (3) , and a housing (12) of the inductive component (10) comprises atP2024, 0849 WO N August 13, 2025- 26 - least one opening (15) and the opening (15) directly adjoins the pipe ( 12 ) .

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