Throttle device for an electrical circuit for a motor vehicle, power converter, electric axle drive and motor vehicle

Abstract

A throttle device (110) for an electrical circuit for a motor vehicle has a magnetic core (200). The magnetic core (200) comprises a first side (205), a second side (210) opposite the first side (205), and a core section extending between the first side (205) and the second side (210). The throttle device (110) comprises a winding (220) that wraps around the core section several times. The throttle device (110) further comprises at least one hole (305) for dissipating heat from the magnetic core (200) to an area surrounding the throttle device (110). The at least one hole (305) is arranged on at least one of the sides (205, 210). Alternatively, a plastic layer is arranged on at least part of the magnetic core (200).

Description

The present approach relates to an electric circuit reactor for a motor vehicle, a power converter, an electric final drive and a motor vehicle.A reactor device includes a winding and a magnetic core. During operation of the choke device, the winding and the magnetic core may become very warm. Cooling the magnetic core may present a challenge.Against this background, the present approach provides an improved throttle device for an electrical circuit for a motor vehicle, an improved power converter, an improved electric final drive and an improved motor vehicle according to the main claims. Advantageous embodiments are evident from the dependent claims and the following description.Heat dissipation from a magnetic core of a choke device can be increased by at least one hole extending into a core section of the magnetic core.A reactor device for a power converter for a motor vehicle has a magnetic core. The magnetic core includes a first side, a second side opposite the first side, and a core portion extending between the first side and the second side. The throttle device comprises a winding which runs several times around the core section. At least one of the sides of the magnetic core has a hole formed in the core portion to conduct heat from the magnetic core to a vicinity of the reactor device. Alternatively or additionally, a plastic layer is arranged on the magnetic core at least partially over the surface.Thus, cooling by the at least one hole or the plastic layer, for example in the form of a plastic extrusion coating, is possible.A throttle device can be used in a known manner, for example in conjunction with a power converter, for example an inverter or a DC-to-DC converter, for a motor vehicle. The motor vehicle can be realized, for example, as a passenger or truck, as a commercial vehicle, as an omnibus or as a working machine.The throttle device can also be referred to as a coil, throttle or inductance. The magnetic core can be embodied in one piece or in multiple pieces and, for example, as a ferrite core. The winding can have a through-opening through which the core section is passed. The at least one hole may extend along a longitudinal axis of the through opening and thus along a longitudinal axis of the core portion. The hole may be formed through a recess in the core portion. For example, the hole can be designed as a bore. The hole may be empty or filled with a material different from a material of the magnetic core and having a higher thermal conductivity. The hole can be designed as a blind hole or through hole. Via the hole, heat can advantageously be dissipated to the outside from the core center of the throttle device, in which a so-called hot spot can form.In addition or alternatively to the hole, the heat can be dissipated via the plastic layer. The plastic layer extends, for example, at least along a wall side of the magnetic core facing the winding. This allows both good heat dissipation and good electrical insulation between the winding and the magnetic core.According to one embodiment, a first hole arranged on the first side can be formed as a first blind hole. Additionally or alternatively, a second hole arranged on the second side can be formed as a second blind hole. By means of the blind holes, heat can advantageously be dissipated from the magnetic core to the surroundings of the throttle device. The blind holes may have an inwardly tapering cross section. For example, the first blind hole and / or the second blind hole can be formed conically. Alternatively, at least one blind hole can be formed in a cylinder-shaped manner. Advantageously, the blind holes can exert no or only a slight influence on a magnetic field generated by the winding and conducted through the magnetic core. That is, the magnetic field lines could not be disturbed or hardly influenced by the blind holes.Alternatively, the hole may be formed as a through hole extending from the first side through the core portion to the second side. This is suitable, for example, for connecting the throttle device to a cooling circuit.A heat conducting material can be arranged in the at least one hole. By means of the heat-conducting material, heat can advantageously be dissipated from the magnetic core to the environment of the throttle device. The heat-conducting material can be formed, for example, as a heat-conducting paste or as a preformed heat-conducting element. Also, only one wall of the hole may be lined with heat conducting material.The throttle device may include a first coolant port for introducing a coolant into the through hole and a second coolant port for discharging the coolant from the through hole. This makes it possible to guide a coolant through the through hole.The throttle device may include an insert member disposed in the through hole. A geometry, a shape or a cross section of the insert element can correspond, for example, to a geometry, a shape or a cross section of the through hole. A material of the insert element, for example copper or aluminum, may have a higher thermal conductivity than the magnetic core. By means of the insert element of good thermal conductivity, heat can thus advantageously be dissipated from the magnetic core to the environment of the throttle device.The magnetic core may be composed of a first part including the first side and a second part including the second side. This enables simple production of the throttle device.According to one embodiment, the hole formed as a through hole may extend through both parts of the magnetic core. An insert member may extend through the through hole. The insert element can have at least one disk-shaped connecting section. The connecting section can thermally connect mutually facing sides of the two parts of the magnetic core, in particular inner surfaces of the partial magnetic cores formed by the two parts, to one another and thus offer a large-surface cooling connection between the two parts and the insert element.The choke device may comprise at least one cooling plate for dissipating the heat from the magnetic core to the environment of the choke device. For example, a first cooling plate may be disposed on the first side of the magnetic core and, additionally or alternatively, a second cooling plate may be disposed on a second side of the magnetic core. By means of the cooling plate, heat can advantageously be dissipated from the magnetic core to the environment of the throttle device.The cooling plate can be connected to the magnetic core in a form-fitting and / or materially integral manner. The heat dissipation can be improved by means of the cooling plate.A heat-conducting material can be arranged on the first side and / or on the second side of the magnetic core. The heat-conducting material can, for example, cover surfaces of the two sides over the full circumference. By means of the heat-conducting material, heat can advantageously be dissipated from the magnetic core to the environment of the throttle device. The heat-conducting material can be arranged, for example, between the at least one cooling plate and the magnetic core. By using the heat-conducting material, a thermal connection of the cooling plates can be increased.The at least one cooling plate may have an extension for insertion into the at least one hole. The cooling plate can be connected to the interior of the magnetic core via the extension.The plastic layer can be formed as a plastic injection molding. The plastic layer can be designed to be thermally conductive in order to advantageously cool the magnetic core. The plastic layer is furthermore advantageous in that it can electrically isolate the magnetic core from the winding. The magnetic core can be surrounded by plastic in its entirety or at least on wall sections facing the winding. As a result, plastic holders between the winding and the magnetic core can be dispensed with. If the magnetic core is injection molded with plastic, this can be better for the cooling function compared to alternative plastic holders because no air is present between the plastic injection molding and the core. Moreover, the assembly is simplified.A power converter may comprise a previously mentioned choke device. The power converter can be designed, for example, as an inverter or a DC / DC converter. In addition to the throttle device, the power converter can comprise power electronics required for a function of the power converter. This embodiment variant of the present approach in the form of a converter also enables the object underlying the present approach to be achieved quickly and efficiently.The power converter and thus the throttle device are suitable, for example, for an electric final drive. Such an electric final drive for a motor vehicle comprises at least one electric machine, a transmission device and a power converter. The power converter can be designed, for example, as a rectifier or an inverter. Using the converter, an electric current required for operating the electric machine can be provided. Using the transmission device, a torque provided by the electric machine can be converted into a drive torque for driving at least one wheel of the motor vehicle. The transmission device can have a transmission for reducing the rotational speed of the electric machine and optionally a differential.Accordingly, a motor vehicle can comprise a converter and additionally or alternatively an electric final drive. This embodiment variant of the present approach in the form of a motor vehicle also enables the object underlying the present approach to be achieved quickly and efficiently.The approach presented is explained in more detail by way of example with reference to the attached drawings. The following are shown: FIG. 1 shows a schematic illustration of a motor vehicle according to an exemplary embodiment; FIG. 2 shows an illustration of a throttle device according to an exemplary embodiment; FIG. 3 shows an illustration of a throttle device according to an exemplary embodiment; FIG. 4 is an illustration of a first part of a magnetic core for use in a choke device according to an embodiment; FIG. 5 is an illustration of a first part of a magnetic core for use in a choke device according to an embodiment; FIG. 6 shows a sectional illustration of a throttle device according to an exemplary embodiment; FIG. 7 is a side view of an exploded view of a throttle device according to an exemplary embodiment; FIG. 8 is an exploded view of a throttle device according to an embodiment; FIG. 9 shows a sectional illustration of a throttle device according to an exemplary embodiment; FIG. 10 is an illustration of a first part of a magnetic core for use in a choke device according to an embodiment; FIG. 11 is an illustration of a first part of a magnetic core for use in a choke device according to an embodiment; FIG. 12 shows a sectional illustration of a throttle device according to an exemplary embodiment; FIG. 13 shows an illustration of a throttle device according to an exemplary embodiment; FIG. 14 shows an illustration of a throttle device according to an exemplary embodiment; FIG. 15 shows an illustration of a throttle device according to an exemplary embodiment; FIG. 16 shows a sectional illustration of a throttle device according to an exemplary embodiment; FIG. 17 shows a schematic illustration of a throttle device according to an exemplary embodiment; FIG. 18 shows an illustration of an insert element for use in a throttle device according to an exemplary embodiment; FIG. 19 shows a sectional illustration of a throttle device according to an exemplary embodiment; FIG. 20 shows an illustration of an insert element for use in a throttle device according to an exemplary embodiment; FIG. 21 shows an illustration of a throttle device according to an exemplary embodiment; FIG. 22 shows an illustration of a throttle device according to an exemplary embodiment; and FIG. 23 shows a sectional illustration of a throttle device according to an exemplary embodiment.In the following description of preferred exemplary embodiments of the present approach, the same or similar reference numerals are used for the elements shown in the different figures and acting in a similar manner, wherein a repeated description of these elements is omitted.FIG. 1 shows a schematic illustration of a motor vehicle 100 according to an exemplary embodiment. Motor vehicle 100 has an electric final drive having an electric machine 105. Electrical energy for operating the electric machine 105 is provided by a power converter 115 comprising a throttle device 110 and by an energy supply device 117, for example a battery. For example, a direct current is provided by the energy supply device 117, which is converted into an alternating current, for example a three-phase alternating current, using the power converter 115 and is provided to the electric machine 105. A shaft driven by the electric machine 105 is coupled directly or using the transmission device 120 to at least one wheel 125 of the motor vehicle 100. Thus, the motor vehicle 100 may be propelled using the electric machine 105. Optionally, the electric final drive comprises a housing in which the power converter 115, the electric machine 105 and the transmission device 120 are integrated or arranged.According to one exemplary embodiment, motor vehicle 100 has a charging device 135, which includes a corresponding throttle device 110. The charging device 135 is used to charge the power supply device 117 using an off-board charging station.FIG. 2 shows an illustration of a throttle device 110 according to an exemplary embodiment. The throttle device 110 can be used by way of example for a power converter as described with reference to FIG. 1. The throttle device 110 is illustrated in an unmounted state. The throttle device 110 comprises a magnetic core 200 constructed in two parts, for example a ferrite core. A core section 215 of the magnetic core 200 extends between a first side 205 and a second side 210 of the magnetic core 200. In the assembled state, the core portion 215 receives a winding 220, for example a copper winding, of the throttle device 110. By way of example, the magnetic core 200 is composed of a first part 230 and a second part 235, which each form a section of the core section 215. For assembling the reactor device 100, the two portions of the core portion 215 may be inserted into a through hole 225 of the coil 220 from opposite sides of the coil 220. The two-part shape of the magnetic core 200 facilitates the manufacture of the choke device 110. Alternatively, the magnetic core 200 can also be embodied in one piece or be composed of more than the two parts 230, 235.For example, at high currents during operation of the choke device 110, the winding 220 and the magnetic core 200, which may be considered as two main parts of the choke device 110 merely by way of example, may become very warm. In order to be able to conduct heat better out of the magnetic core 200, starting from at least one of the sides 205, 210, at least one hole is formed in the magnetic core 200, as is described in more detail with reference to the following figures. Thus, the magnetic core 200 can also be referred to as a ferrite core with an additional bore.FIG. 3 shows an illustration of a throttle device 110 according to an exemplary embodiment. By way of example, this choke device 110 is the choke device shown in FIG. 2 in an assembled state, i.e. the winding 220 is accommodated by the core section of the magnetic core 200.The magnetic core 200 includes a first hole 305 for dissipating heat from the magnetic core 200 to a vicinity of the reactor device 110. The first hole 305 is arranged or integrated here, by way of example, on the first side 205 of the magnetic core 200. The first hole 305 extends into the core portion from an outer wall of the magnetic core 200. By means of the first hole 305, heat can be dissipated from the interior of the magnetic core 200 via the first side 205 to the environment of the throttle device 110.A cross section of the first hole 305 is formed round, for example. Such a hole 305 can be designed simply as a bore. Alternatively, the cross section of the first hole 305 is, for example, oval or angular. In other words, a geometry of the first hole 305, which is also referred to as an additional bore, can be freely selected.According to one exemplary embodiment, the first hole 305 arranged on the first side 205 is formed as a first blind hole. This means that the first hole 305 does not extend as a through hole or through hole as far as the second side 210. According to such an embodiment, the first hole 305 thus does not completely penetrate the throttle device 110 from the first side 205 to the second side 210.FIG. 4 shows an illustration of a first part 230 of a magnetic core, as is described, for example, with reference to FIG. 1.The first part 230 comprises a wall forming the first side 205 of the magnetic core. The first hole 305 shaped as a blind hole is arranged in the first side 205FIG. 5 shows an illustration of the first part 230 of a magnetic core according to an exemplary embodiment shown in FIG. 4.The first part 230 is illustrated from a different perspective than in the previously described FIG. 4, namely with a view to a first core section side 400 of the core section of the magnetic core. The core section is formed cylindrically. The first core portion side 400 of the core portion faces the first side 205.Since the first hole, as explained with reference to FIG. 4, is designed as a blind hole according to this exemplary embodiment, it does not extend completely from the first side 205 to the first core section side 400 and is therefore not visible in FIG. 5.FIG. 6 shows a sectional illustration of a throttle device 110 according to an exemplary embodiment. By way of example, this throttle device 110 is the throttle device shown in FIG. 3.The choke device 110 comprises, in addition to the first hole 305, a second hole 605 for dissipating heat 602 from the magnetic core 200 to the surroundings of the choke device 110. The second hole 605, also referred to as a further bore, is arranged or integrated here opposite the first hole 305 on the second side 210 of the magnetic core 200. As a result, the heat 602 can also be dissipated from the magnetic core 200 via the second side 210 to the surroundings of the throttle device 110 by means of the second hole 605.According to one exemplary embodiment, the second hole 605 arranged on the second side 210 is formed as a second blind hole. This means that the second hole 605 does not extend as a through hole or through hole as far as the first side 205. According to such an embodiment, the second hole 605 thus does not completely penetrate the throttle device 110 from the second side 210 to the first side 205.According to one exemplary embodiment, the two holes 205, 605 are shaped and arranged in mirror-image fashion.According to one exemplary embodiment, the two holes 205, 605 have a cross section that narrows starting from the sides 205, 210. For example, the two holes 205, 605 are formed in a conical shape.Optionally, a heat conducting material 607, for example a thermal interface material or TIM for short, such as a gap filler or a gap pad, is arranged in the first hole 305 and in the second hole 605 as well as optionally further heat conducting material 609 on the outer walls of the magnetic core 200 along the first side 205 and the second side 210.According to an embodiment, a first cooling plate 610 for dissipating the heat 602 is arranged adjacent to the first side 205, and a second cooling plate 615 for dissipating the heat 602 is arranged adjacent to the second side 210. Optionally, the further heat conducting material 609 is arranged between the cooling plates 610, 615 and the magnetic core 200.The first cooling plate 610 optionally includes a first extension 620 inserted into the first hole 305. The second cooling plate 615 optionally includes a second extension 625 inserted into the second hole 605. According to an embodiment, outer shapes of the protrusions 620, 625 correspond to shapes of the holes 305, 605 such that outer walls of the protrusions 620, 625 are in direct contact with the walls of the holes 305, 605, or are connected to the walls of the holes 305, 605 via the thermal conductive material 607. By way of example, the extensions 620, 625 are formed as conical spikes. Thus, the first cooling plate 610 and the second cooling plate 615 are each positively connected to the magnetic core 200. Alternatively or additionally, the first cooling plate 610 and the second cooling plate 615 are each connected to the magnetic core 200 in a materially integral manner. Thus, the cooling plates 610, 615 and walls of the holes 305, 605 are interconnected using the thermal conductive material 607, according to an embodiment.The magnetic core 200 optionally has side portions 630 between which the core portion 215 is disposed. Openings are formed between the side sections 630 and the core section 215, through which openings the winding 220 is guided. To electrically isolate the winding 220 from the magnetic core 200, a support member 635 is optionally disposed around the winding 220. In other words, the magnetic core 200, for example a ferrite core, and the winding 220, for example a copper winding or Cu winding for short, are separated from one another because of electrical insulation by the holding element 635, for example in the form of an additional plastic holder.FIG. 7 shows a side view of an exploded illustration of a throttle device 110 according to an exemplary embodiment. By way of example, this throttle device 110 is the throttle device shown in FIG. 6 in an unmounted state.The heat-conducting material 607, for example the thermal interface material shown in FIG. 6 or TIM for short, such as a gap filler or a gap pad, is arranged for example for lining or filling the holes 305, 605 and the further heat-conducting material 609 as an intermediate layer between outer walls of the magnetic core 200 and the cooling plates 610, 615. The further heat-conducting material 609 is embodied, for example, as a preformed layer or layer and optionally has holes for the continuations 620, 625 to pass through.FIG. 8 shows an exploded view of a throttle device 110 according to an exemplary embodiment. By way of example, this throttle device 110 is the throttle device shown in FIG. 6 in an unmounted state.According to one exemplary embodiment, dimensions of the further heat-conducting material 609 correspond to dimensions of the cooling plates 610, 615, such that the cooling plates 610, 615 are bonded to the magnetic core 200 over the entire surface via the further heat-conducting material 609.FIG. 9 shows a sectional illustration of a throttle device 110 according to an exemplary embodiment. By way of example, this throttle device 110 is the throttle device shown in FIG. 8 in an assembled state.FIG. 9 shows magnetic field lines of a magnetic field 900 generated by the winding 220. The magnetic field lines are guided within the magnetic core 200.According to one exemplary embodiment, a shape and dimension of the holes 305, 605 is selected such that they have as little or no influence on a profile of the magnetic field 900 as possible. That is, the magnetic field lines are not disturbed or hardly influenced by the blind holes 305, 605.According to an embodiment, longitudinal axes of the holes 305, 605 extend along a longitudinal axis of the core portion of the magnetic core 200 and accordingly along a longitudinal axis of the through hole of the winding 220. Thus, the holes 305, 605 are centrally located on the core portion.According to an embodiment, a depth of each of the holes 305, 605 corresponds more than a sixth of a length of the core portion along the longitudinal axis and / or less than a third of the length of the core portion along the longitudinal axis.FIG. 10 shows an illustration of a first part 230 of a magnetic core for use in a throttle device according to an exemplary embodiment. By way of example, the first part 230 is used for another exemplary embodiment of the throttle device illustrated in FIG. 2.The first part 230 of the magnetic core corresponds to the first part described with reference to FIG. 4, with the difference that the first hole in the core section is not formed as a blind hole but as part of a through hole 1000FIG. 11 is a diagram of the first part 230 of a magnetic core shown in FIG. 10 for use in a throttle device according to an exemplary embodiment.The first part 230 is shown from a different perspective than the first part shown in the previously described FIG. 10, namely from the perspective of the first core section side 400. The first core portion side 400 faces the first side 205.According to an embodiment, the first hole is formed as part of the through hole 1000. According to this exemplary embodiment, the through hole 1000 thus penetrates the first part 230 completely from the first side 205 to the first core portion side 400.FIG. 12 shows a sectional illustration of a throttle device 110 according to an exemplary embodiment. Unlike the throttle device illustrated in FIG. 8 or 9, the throttle device 110 does not have two blind holes but a through hole 1000. The through hole 1000 extends from the first side 205 through the core portion 215 continuously to the second side 210.In other words, FIG. 12 can also be referred to as a representation of a ferrite core with a through bore.According to one exemplary embodiment, the magnetic core 200 is composed of two parts which are shaped, for example, in accordance with the first part shown in FIG. 11. The through holes of the two parts, also referred to as two cores, are connected to each other and optionally sealed.According to an embodiment, the through hole 1000 is formed for passing a coolant. For this purpose, a first coolant connection 1205 is connected to the through hole 1000 on the first side 205. On the second side 210, a second coolant port 1210 is connected to the through hole 1000. By way of example, the coolant connections 1205, 1210 are connected to the magnetic core 200 and optionally sealed.Using the coolant connections 1205, 1210, a coolant 1215 can be guided or conducted through the through hole 1000. For example only, the coolant 1215 flows or flows from the first coolant port 1205, through the through hole 1000, and to the second coolant port 1210. The coolant 1215, also called a cooling medium, is used, for example, for discharging the heat 602 from the magnetic core 200, in particular from the core section 215, to the surroundings of the throttle device 110. Thus, the magnetic core 200 can be directly cooled by an additional cooling medium.FIG. 13 shows a further illustration of the throttle device 110 according to an exemplary embodiment shown on the basis of FIG. 12.On the first side 205, the first coolant port 1205 is connected to the through hole and to the magnetic core 200. On the second side 210, the second coolant port 1210 is connected to the through hole and to the magnetic core 200.FIG. 14 shows a further illustration of the throttle device 110 according to an exemplary embodiment described with reference to FIGS. 12 and 13. By way of example, the throttle device 110, also referred to as a throttle, is the throttle device illustrated in FIG. 12 or 13, or a similar throttle device.Optionally, the coolant connections 1205, 1210 comprise line sections for guiding the coolant, which are guided parallel to outer walls of the magnetic core along the sides 205, 210.FIG. 15 shows a further illustration of the throttle device 110 according to an exemplary embodiment described with reference to FIGS. 12 to 14.According to an embodiment, the winding extends on opposite sides beyond a circumferential wall of the magnetic core 200.FIG. 16 shows a sectional illustration of a throttle device 110 according to an exemplary embodiment. The throttle device 110 is designed in accordance with the throttle device described with reference to FIGS. 12 to 15 with a through hole 1000 through the magnetic core 100. However, the through hole 1000 is filled with a heat conducting material. According to the exemplary embodiment shown, an insert element 1600 is arranged for this purpose in the through hole 1000. In other words, the insert element 1600, which is also referred to as an insert or an additional insert, is inserted into the through-hole, i.e. into the through-hole 1000, of the ferrite core, i.e. of the magnetic core 200. According to this embodiment, FIG. 16 may also be referred to as a representation of a ferrite core with a through bore. For example only, the insert member 1600 extends over an entire length of the through hole 1000 from the first side 205 to the second side 210.A material of the insert element 1600 has, for example, a higher thermal conductivity than the ferrite core or the magnetic core 200. The insert member 1600 is formed of, for example, copper (Cu) or aluminum (Alu). Alternatively, the insert 1600 is formed as a soft material, such as gap filler. By means of the insert element 1600, which is, for example, highly thermally conductive, the heat 602 can be conducted from the magnetic core 200, in particular from the core center, that is to say from the core section 215, to the thermally conductive material 607, for example a thermal interface material or TIM for short, such as, for example, a gap filler or a gap pad, on outer sides of the magnetic core 200.Optionally, the choke device 110 includes a first cooling plate 610 and a second cooling plate 615 that extend across the sides 205, 210 of the magnetic core 200 and are configured to receive heat directly from the magnetic core 200 as well as from the insert 1600 and dissipate it to the environment of the choke device 110.FIG. 17 shows a further illustration of the throttle device 110 according to an exemplary embodiment described with reference to FIG. 16.The throttle device 110 includes the insert member 1600 disposed in the through hole 1000. A cross section or geometry of the insert element 1600 is, for example, round shaped. Alternatively, the cross section or geometry of the insert element 1600 is angular, square, rectangular or oval shaped. In other words, the geometry of the insert element 1600 is, for example, round, rectangular, square or oval.For example only, the insert member 1600 extends over an entire length of the through hole 1000 from the first side 205 to the second side 210. By means of the insert element 1600, the heat can be dissipated, transported away or dissipated from the magnetic core 200 to the environment of the throttle device 110.FIG. 18 shows a schematic illustration of an insert element 1600 for use in a throttle device according to an exemplary embodiment. By way of example, the insert 1600 is the insert illustrated in FIG. 16 or 17 or a similar insert. The insert 1600 may be disposed, inserted, integrated, or inserted in the throttle device shown in FIG. 16 or 17, for example.For example, the insert 1600 is formed as a rod having a diameter matched to the through hole 1000.FIG. 19 shows a sectional illustration of a throttle device 110 according to an exemplary embodiment. The throttle device 110 is constructed with a through hole 1000 through the magnetic core 100 according to the throttle device described with reference to FIGS. 16 to 17, and an insert element 1600 is arranged in the through hole 1000. In contrast to FIGS. 16 to 17, the insert element 1600 has both a rod-shaped section which extends over the entire length of the through hole 1000 and a disc-shaped connecting section 1900 which is formed centrally on the insert element 1600.The connecting portion 1900 extends in a gap disposed between the first part 230 and the second part 235 of the magnetic core 200. According to this exemplary embodiment, the parts 230, 235 of the magnetic core 200 are therefore not directly adjacent to one another but rather are separated from one another via the connecting portion 1900 and thermally connected to one another via the connecting portion 1900. Mutually opposite main surfaces of the connecting portion 1900 are matched in terms of their shape and size to mutually facing sides of the parts 230, 235 of the magnetic core 200.Thus, the connecting portion 1900 thermally connects inner surfaces of the ferrite cores to each other. The insert element 1600 can accordingly also be referred to as an insert with a large-area cooling connection between the ferrite cores. By means of the connecting portion 1900 and the rod-shaped portion of the insert element 1600, the heat 602 can be dissipated from the magnetic core 200, in particular from the core portion 215. The heat 602 can be dissipated to the outside, for example, over a large area from the ferrite core center, that is to say the center of the core section 215, via the insert element 1600. Optionally, the heat 602 can be dissipated to optional cooling plates 610, 615 via further heat-conducting material 609.FIG. 20 is a diagram of an insert member 1600 for use in a throttle device according to an embodiment. For example only, the insert member 1600 may be used in the throttle device illustrated in FIG. 19 or in a similar throttle device.The insert element 1600 is rod-shaped and additionally comprises the connecting portion 1900, which is arranged, for example, in the middle of the insert element 1600. The connecting portion 1900 is formed as a round disk, and the rod-shaped portion of the insert member 1600 penetrates the connecting portion 1900 centrally.FIG. 21 shows a schematic illustration of a throttle device 110 according to an exemplary embodiment. The throttle device 110 is in an unmounted state.The magnetic core 200 includes the first part 230 and the second part 235 between which the winding 220 is disposed. On an inner side opposite an outer side 2100 of the magnetic core 200, which inner side faces the winding 220 in the assembled state, according to an exemplary embodiment, a plastic layer 2105, also referred to as extrusion coating, is arranged at least partially over the surface, according to an exemplary embodiment over the entire surface, for dissipating the heat from the magnetic core 200 to the environment of the throttle device 110. The magnetic core 200 with the plastic layer 2105 can accordingly also be referred to as a ferrite core with injection molding. The magnetic core 200 is optionally encapsulated in a thermally conductive plastic. By the resin layer 2105, the winding 220, for example, a copper winding, and the magnetic core 200 are electrically insulated. The magnetic core 200 is well cooled by the optionally thermally conductive plastic layer 2105.Optionally, at least one of the parts 230, 235 is designed with a hole, as is described with reference to the preceding figures.FIG. 22 shows a schematic illustration of a throttle device 110 according to an exemplary embodiment. By way of example, the throttle device 110 is the throttle device illustrated in FIG. 21 in an assembled state. The magnetic core 200 encloses the winding 220. Due to the plastic layer 2105, according to an embodiment there is no direct contact between the winding 220 and the magnetic core 200. Thus, a separate holder between the winding 220 and the magnetic core 200 may be omitted.FIG. 23 shows a sectional illustration of a throttle device 110 according to an exemplary embodiment. By way of example, the throttle device 110 is the throttle device illustrated in FIG. 22 or a similar throttle device.The winding 220 extends through the side sections 630 of the magnetic core 200, for example the ferrite core. The core section 215 of the magnetic core 200 is arranged between the side sections 630. According to one exemplary embodiment, the plastic layer 2105, also called encapsulation, is arranged entirely and circumferentially on the outer side 2100 of the core section 215 for dissipating the heat 602 from the magnetic core 200 to the environment of the throttle device 110. The magnetic core 200 is thus encapsulated in a thermally conductive plastic. By the resin layer 2105, the winding 220, for example, a copper winding, and the magnetic core 200 are electrically insulated. The magnetic core 200 is well cooled by the optionally thermally conductive plastic layer 2105. The heat 602 flows through the plastic layer 2105, merely by way of example, from the magnetic core 200 in the direction of the winding 220 and the cooling base 2305.As shown on the basis of the preceding FIGS. 1 to 20, the at least one hole, also referred to as a bore, enables an advantageous throttle to be cooled by a bore or an advantageous cooling concept for a throttle having bores. The at least one cooling plate, which is also called wedge plate, enables an advantageous throttle cooling of wedge plates, for example for a throttle HVHV DCDC GaN. The described approach can be used, for example, in connection with a DC / DC converter or DC / DC converter (Engl. DC / DC converter) or as a charging device in the form of an onboard charger. According to one exemplary embodiment, the throttle device is suitable for high-voltage applications (HVHV).According to one exemplary embodiment, a plurality of holes are arranged in parallel, for example a plurality of through holes or a plurality of blind holes per side of the magnetic core.According to one embodiment, there is no corresponding hole in the embodiments described with reference to FIGS. 21 to 23.Reference numerals denote reference numerals100 Motor vehicle 105 Electric machine 110 Throttle device 115 Power converter 117 Power supply device 120 Transmission device 125 Wheel 135 Charging device 200 Magnetic core 205 First side of the magnetic core 210 Second side of the magnetic core 215 Core portion 220 Winding 225 Through opening 230 First part of the magnetic core 235 Second part of the magnetic core 305 First hole 400 First core portion side 602 Heat 605 Second hole 607 Heat-conducting material 609 Further heat-conducting material 610 First cooling plate 615 Second cooling plate 620 First extension 625 Second extension 630 Side portions 635 Holding element 900 Magnetic field 1000 Through hole 1205 First coolant connection 1210 Second coolant connection 1215 Coolant 1600 Insert element 1900 Connecting portion 2100 Outside of the magnetic core 2105 Plastic layer 2300 Bottom of the magnetic core 2305 Cooling base

Claims

A choke device (110) for a power converter (115) for a motor vehicle (100), wherein the choke device (110) comprises the following features: a magnetic core (200), which comprises a first side (205), a second side (210) opposite the first side (205) and a core section (215) extending between the first side (205) and the second side (210); and a winding (220), which runs around the core section (215) multiple times; characterized in that a hole (305; 605; 1000) is formed in the core section (215) on at least one of the sides (205, 210) of the magnetic core (200) and / or a plastic layer (2105) is arranged on the magnetic core (200) at least partially to dissipate heat (602) from the magnetic core (200) to a surrounding area of the choke device (110).Throttle device (110) according to Claim 1, wherein the hole (305) is formed as a first blind hole on the first side (205) and / or the hole (605) is formed as a second blind hole on the second side (210).Throttle device (110) according to one of the preceding claims, wherein the hole (305; 605) is formed in a conical manner.The throttle device (110) according to claim 1, wherein the hole (1000) is formed as a through hole extending through the core portion (215).Throttle device (110) according to one of the preceding claims, wherein a heat-conducting material (607) is arranged in the hole (305; 605; 1000).The throttle device (110) according to claim 4, wherein the throttle device (110) includes a first coolant port (1205) for introducing a coolant into the hole (1000) and a second coolant port (1210) for discharging the coolant from the hole (1000).The choke device (110) according to any one of the preceding claims, wherein the magnetic core (200) is composed of a first part (230) comprising the first side (205) and a second part (235) comprising the second side (210), wherein the hole (1000) extends through both parts (230, 235), and wherein the choke device (110) comprises an insert element (1600) extending through the hole (1000) and comprising at least one disc-shaped connecting portion (1900) configured to thermally connect mutually facing sides of the two parts (230, 235) to each other.The choke device (110) according to any one of the preceding claims, comprising a first cooling plate (610) arranged on the first side (205) of the magnetic core (200) and / or comprising a second cooling plate (615) arranged on the second side (210) of the magnetic core (200).The throttle device (110) according to claim 8, wherein at least one of the cooling plates (610, 615) comprises an extension (620, 625) for insertion into the at least one hole (305; 605; 1000).Throttle device (110) according to one of the preceding claims, wherein the plastic layer (2105) is formed as a plastic injection-molded coating.Power converter (115) having a throttle device (110) according to one of the preceding claims.Electric final drive for a motor vehicle (100), wherein the electric final drive comprises at least one electric machine (105), a transmission device (120) and a power converter (115) according to claim 11.Motor vehicle (100) having a power converter (115) according to Claim 11 and / or an electric final drive according to Claim 12.

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