SECONDARY PART

Description

[0001] The invention relates to a secondary part.

[0002] It is generally known that a secondary part can be inductively coupled to a primary conductor system.

[0003] From DE 10 2018 007 912 A1 is as the most immediate state of the art A system for the inductive transmission of electrical energy is known, wherein the system has a secondary part inductively coupled to a primary conductor, wherein the secondary part has a housing, wherein a printed circuit board equipped with electronic components and a secondary winding are arranged inside the housing, wherein a foam part is arranged between the printed circuit board and the secondary winding and in particular has potting compound in contact with it on both sides, i.e. on the side facing the printed circuit board and on the side facing the secondary winding.

[0004] A contactless connector is known from US 2013 / 0 002 039 A1.

[0005] From US patent 2006 / 0103496A1, an electrical component is known that exhibits a variable air gap effect.

[0006] From the EP 2 828 869 A1 An energy transmission system with a module that can be inductively coupled to a primary conductor system is known.

[0007] From the WO 2007 / 137682 A2 A transformer head is known.

[0008] From the US 2014 / 327318 A1 An electromagnetic connector is known.

[0009] From the EP 1 686 597 A2 A device for inductive energy transfer between a placement machine and a component feeder is known.

[0010] From the EP 3 420 625 B1 is a known inductive charging port for portable computer devices.

[0011] The invention is therefore based on the objective of further developing a secondary part, whereby the secondary part should be operable with low noise.

[0012] According to the invention, the problem is solved in the secondary part according to the features specified in claim 1.

[0013] Important features of the invention for the secondary part, particularly for a system for the inductive transmission of electrical power, are that the secondary part has a ferrite core, wherein a winding is received by a coil carrier, wherein a first spring element supported on at least a first foot region of the coil carrier presses the ferrite core against contact areas of a housing part, wherein the housing part is connected to a base part, in particular by means of screws, wherein the first foot region is supported on a first step of the base part or wherein the coil carrier, in particular by means of its foot region, is supported on a printed circuit board which is arranged between the coil carrier and the base part, in particular wherein the coil carrier presses the printed circuit board towards the base part, in particular via an intermediate insulating layer, in particular insulating coating of the printed circuit board or insulating plate.

[0014] A key advantage is that the spring force generated by the spring element eliminates any play, thus enabling quiet operation. In particular, the secondary component can be mounted on a vehicle, especially a rail vehicle, and no rattling noises are generated when the secondary component is subjected to varying accelerations, such as jolts. This is because the spring element presses the parts together, preventing any play. This avoids collisions between parts of the secondary component and therefore also eliminates operating noise. Furthermore, alternating current can be used for power supply, and the suppression of play also prevents displacements of the secondary component parts relative to each other caused by magnetostriction or alternating magnetic fields.

[0015] A further advantage is that the ferrite core is compressed, i.e., not stretched but compressed. This allows the ferrite core to be assembled from ferrite parts, in particular the yoke and legs. This enables cost-effective manufacturing. Preferably, the ferrite core is U-shaped, such that the two spaced-apart legs each lie in full contact with the yoke.

[0016] In an advantageous embodiment, the first stage is arranged on the side of the first foot section (9) facing away from the spring element. It is advantageous that the spring element presses against the foot section and thus introduces a spring force into the coil carrier, directed away from the coil carrier.

[0017] In a preferred embodiment, the ferrite core has a yoke and two legs. An advantage of this design is that the ferrite core can be manufactured in multiple sections, thus reducing costs. Furthermore, air gaps can be avoided.

[0018] In an advantageous embodiment, a second spring element supported on at least a second foot area of ​​the coil carrier presses the ferrite core against the contact areas of the housing part. wherein the second foot section is supported on a second step of the base part, in particular wherein the second step is arranged on the side of the second foot section (9) facing away from the second spring element. It is advantageous that the spring force is distributed.

[0019] In an advantageous embodiment, the first spring element presses on the yoke of the ferrite core, while the second spring element presses on the yoke of the ferrite core, wherein the yoke has a constriction, in particular a narrowing, which is arranged between the first spring element and the second spring element, in particular wherein the constriction is arranged between the contact area where the first spring element contacts the yoke and the contact area where the second spring element contacts the yoke. It is advantageous that pressure is exerted on the yoke from both sides of the constriction and thus the constriction is subjected to as little stress as possible.

[0020] In an advantageous embodiment, the first of the two legs is cuboid in shape, The second of the two legs is cuboid in shape, and the yoke is also cuboid except for the constriction. An advantage of this design is that the legs and the yoke can be arranged perpendicular to each other, thus allowing the spring force to be transmitted linearly through the ferrite core.

[0021] In an advantageous embodiment, the first leg has a flat side surface with which the first leg abuts a flat side surface of the yoke, wherein the second leg has a flat side surface with which the second leg rests against a flat side surface of the yoke, in particular wherein the normal direction of the flat side surface of the first leg is aligned parallel to the direction of the spring force generated by the first spring element and / or wherein the normal direction of the flat side surface of the second leg is aligned parallel to the direction of the spring force generated by the second spring element, in particular and to the normal direction of the flat side surface of the first leg. It is advantageous that the legs do not tilt relative to the yoke. The spring force is introduced into the contact surfaces in a normal direction.

[0022] In an advantageous embodiment, each of the contact surfaces on the housing part is formed in one piece, particularly as a single component, and projects towards the ferrite core, especially wherein the housing part including the contact surfaces is formed as a plastic injection-molded part. It is advantageous that the leg has a point contact or two-point contact with the housing part. The spring force of the spring element is thus distributed across the contact surfaces. The ferrite core is therefore aligned according to the positions of the contact surfaces.

[0023] In an advantageous embodiment, each of the foot areas on the coil carrier is formed in one piece, particularly as a single component, as a rear grip on the coil carrier, especially wherein the coil carrier including the foot areas is formed as a plastic injection-molded part. It is advantageous that the foot areas are shaped as rear grips, allowing the spring element to engage and be supported there, so that the coil carrier is pressed towards the base part, particularly onto a step of the base part, and the ferrite core is pushed away from the step.

[0024] In an advantageous embodiment, pocket-shaped receiving areas, in particular recesses, are formed on the housing part in which the legs are received. It is advantageous that the legs rest against the housing part both in and against the direction of the winding axis, since the legs are pressed into the pocket-shaped receiving areas.

[0025] In an advantageous embodiment, the yoke projects through a continuous recess in the coil carrier, with the ferrite core being enclosed by the base part together with the housing part, forming a housing. An advantage of this design is that the field strength generated by the winding causes a strong magnetic flux, since ferrite has high magnetic permeability. The coil carrier can be made of plastic and attached to the yoke. The winding is then wound onto the coil carrier and thus guided around the yoke.

[0026] The legs are preferably not wound by the winding. The legs can be made as cuboid plates. The yoke can also be made as a cuboid plate, although the constriction is located in the middle of the yoke.

[0027] In an advantageous embodiment, a printed circuit board is arranged between the base and the winding and / or the coil carrier, with the winding connections leading to the printed circuit board and electrically connected to conductors on the board. An advantage of this design is that the elastically designed connections allow the printed circuit board to be pressed from the winding towards the base. This suppresses play and enables a stable, rigid design, thus preventing rattling noises during operation.

[0028] In an advantageous embodiment, an insulating layer, in particular an insulating plate, is arranged between the printed circuit board and the base, especially for electrical insulation. It is advantageous that the printed circuit board can be pressed against the base, particularly via the winding leads, which press the printed circuit board towards the base. Thus, the printed circuit board is connected to the base without play, and electrical insulation can be interposed. This insulation can be implemented as a coating on the populated printed circuit board or as an interposed insulating plate.

[0029] In an advantageous embodiment, capacitors are mounted on the circuit board and connected electrically in series and / or parallel to the winding. The advantage here is that high efficiency can be achieved, since, due to resonant transmission, only minor changes in power transmission occur even with fluctuations in the inductive coupling strength. For resonant coupling, the resonant frequency of the resonant circuit formed by the capacitance of the capacitors and the inductance of the winding matches the frequency of the alternating current impressed into the primary conductor.

[0030] In this system for inductive power transmission with a secondary component, it is important that an elongated line conductor is arranged between the legs. in particular wherein the line conductor has the same distance to both legs and / or wherein the line conductor is aligned parallel to the surfaces of both legs, in particular wherein the line conductor is aligned perpendicular to the normal direction of the contact surface between the yoke and the first and / or second leg.

[0031] An advantage of this is that the secondary part, which has an essentially U-shaped cross-section, can be moved in the direction of the line conductor without changing the inductive coupling.

[0032] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0033] The invention will now be explained in more detail with reference to schematic illustrations: In the Figure 1 A first secondary component according to the invention of a system for the inductive transmission of electrical power is shown in cross-section. Figure 2 The secondary part is shown in a sectional, oblique view. Figure 3 The secondary part is shown exploded in an oblique view. In the Figure 4 A side view of the cut-off secondary part is shown.

[0034] As shown in the figures, the secondary part has a trough-shaped base part 4, which is preferably made of metal, in particular aluminium.

[0035] The base part 4 has two raised wall areas in which plate-shaped legs of a ferrite core are received.

[0036] These legs 3 are connected to each other by means of a similarly plate-shaped yoke 6 of the ferrite core.

[0037] With the exception of a narrowing 7 of the yoke 6, the yoke 6 and each of the legs 3 are preferably designed as cuboids. Thus, each cuboid rests in contact with another cuboid, so that the contacting side surfaces of the cuboids are parallel to each other.

[0038] Overall, the ferrite core has a U-shaped appearance.

[0039] The constriction 7 is preferably formed in the middle of the yoke 6, so that the yoke 6 has an increased risk of breakage in the area of ​​the constriction, since the yoke 6 is less stable in this area of ​​the constriction 7.

[0040] The yoke 6 is inserted through a coil carrier 1, preferably made of plastic, which receives the winding 5, which is wound around the yoke 6.

[0041] Foot areas 9, which are located on the respective steps formed on the base part 4.

[0042] The base part 4 also includes a circuit board 8, to which the terminals 21 of the winding 5 are electrically connected.

[0043] The circuit board 8, which is populated with electronic components, is electrically insulated from the base part 4. This can also be achieved by an additional insulating plate, which is arranged between the circuit board 8 and the base part 4.

[0044] The coil carrier 1 has foot areas 9 on which spring elements 10 are supported, which press on the yoke 6, thus pressing the legs 3 against support areas 20 of a housing part 2, which is detachably connected to the base part 4, in particular by clips and / or screws.

[0045] In particular, two spring elements 10 press on the coil carrier 1, but the constriction at the yoke 6 is arranged between the two contact points of the two spring elements 10 on the yoke 6.

[0046] According to the invention, a three-point mounting of the ferrite core against the housing part 2 is provided, so that tilting of one leg 3 relative to the yoke 6 can be prevented. For this purpose, the first leg 3 rests on two spaced-apart bearing areas 20 of the housing part 2 and the other leg 3 rests on the housing part 2 via only a single bearing area 20.

[0047] Thus, the pole surfaces of the legs 3 are supported over a total of three support areas 20 and are therefore not over-constrained.

[0048] The contact areas 20 are formed on the housing part 2 and protrude towards the pole surfaces of the legs 3.

[0049] The legs 3 are surrounded, in particular received and enclosed, by the material of the base part 4 and the housing part 2.

[0050] The ferrite core, composed of the yoke 6 and the legs 3, is pressed by the spring elements 10 against the three-point bearing, which is formed by the three support areas 20. Thus, the flat side surfaces of the legs 3 rest against the equally flat side surface of the yoke 6. Two of the support areas 20 support the first leg 3, and the third support area 20 supports the other leg 3.

[0051] The flat contact of the planar side surfaces prevents the formation of air gaps between the yoke 6 and the legs 3.

[0052] The housing part has two pocket-shaped recesses for receiving the legs, into which the legs are inserted.

[0053] Housing part 2 is preferably made of plastic.

[0054] Each of the spring elements 10 is supported at two foot areas 9.

[0055] A long line conductor laid in a system is supplied with a medium-frequency alternating current, which has a frequency between 10 kHz and 1 MHz.

[0056] The line conductor is inductively coupled to the winding 5, being oriented perpendicular to the winding axis of the winding 5. The line conductor is arranged between the legs 3, so that the secondary part can be moved along the line conductor without changing the inductive coupling between the winding 5 and the line conductor.

[0057] In this way, electrical power can be inductively transferred from the line conductor to the secondary part.

[0058] Capacitors are preferably arranged on the circuit board 8, which are connected in series or parallel to the winding 5, wherein the resonant frequency of the resulting resonant circuit corresponds to the frequency of the alternating current impressed into the line conductor. Thus, a high efficiency can be achieved in inductive transmission.

[0059] Preferably, the line conductor is attached to a rail, in particular a monorail, so that a rail vehicle is supplied with electrical power by means of the secondary part of the traction drive and the control of the rail vehicle connected to it.

[0060] The spring force generated by the spring element 10 is thus used to compress the spring core. For pressing the circuit board 8 against the base part 4, an elastic component, in particular a second spring element, can be used, which is arranged between the circuit board 8 and the coil carrier 1, in particular the respective foot region 9 of the coil carrier 1. Thus, the force used to press the circuit board 8 is determined by the elastic component, and the force used to compress the ferrite core is different. Preferably, a higher force is used to compress the ferrite core than to press the circuit board 8 against it.

[0061] In further embodiments according to the invention, each of the spring elements 10 is supported on only a single foot area.

[0062] In further embodiments according to the invention, the coil carrier 1 is not supported on a step of the base part 4, but presses the circuit board 8 towards the base part 4 by means of its foot areas 9, in particular against the intermediate insulating layer or insulating plate.

[0063] Thus, not only is the spring core held together by the spring force, but the circuit board 8 is also pressed against the base part 4 without play.

[0064] In this way, the same amount of force is used to hold the spring core together as well as to press down the circuit board 8. Reference symbol list

[0065] 1 Coil carrier 2 Housing part 3 Leg 4 Base part 5 Winding 6 Yoke 7 Constriction, in particular narrowing 8 Circuit board 9 Foot area of ​​the coil carrier 1 10 Spring element 20 Support area 21 Connection of the winding 5

Claims

1. Secondary part, in particular for a system for inductively transmitting electrical power, wherein the secondary part comprises a ferrite core (3, 6), wherein a winding (5) is held by a coil carrier (1), wherein a first spring element (10), which is supported on at least a first foot region (9) of the coil carrier (1), presses the ferrite core against bearing regions (20) of a housing part (2), wherein the housing part (2) is connected to a base part (4), in particular by means of screws, - wherein the first foot region (9) is supported on a first step of the base part (4), - or wherein the coil carrier (1) is supported, in particular by means of its foot region, on a printed circuit board (8) which is arranged between the coil carrier (1) and the base part (4), in particular wherein the coil carrier (1) presses the printed circuit board (8) toward the base part (4), in particular via an interposed insulating layer, in particular an insulating coating of the printed circuit board (8) or an insulating panel.

2. Secondary part according to claim 1, wherein the first step is arranged on the side of the first foot region (9) remote from the spring element (10).

3. Secondary part according to any one of the preceding claims, wherein the ferrite core comprises a yoke (6) and two legs (3).

4. Secondary part according to any one of the preceding claims, wherein a second spring element (10), which is supported on at least a second foot region (9) of the coil carrier (1), presses the ferrite core against the bearing regions (20) of the housing part (2), wherein the second foot region (9) is supported on a second step of the base part (4), in particular wherein the second step is arranged on the side of the second foot region (9) remote from the second spring element (10).

5. Secondary part according to any one of the preceding claims, insofar as dependent on claim 3, wherein the first spring element (10) presses on the yoke (6) of the ferrite core, wherein the second spring element (10) presses on the yoke (6) of the ferrite core, wherein the yoke (6) has a narrowing (7), in particular a narrow portion, which is arranged between the first spring element (10) and the second spring element (10), in particular wherein the narrowing (7) is arranged between the contact area at which the first spring element (10) contacts the yoke (6) and the contact area at which the second spring element (10) contacts the yoke (6).

6. Secondary part according to any one of the preceding claims, insofar as dependent on claim 3, wherein the first of the two legs (3) is cuboid-shaped, wherein the second of the two legs (3) is cuboid-shaped, wherein, with the exception of the narrowing (7), the yoke (6) is cuboid-shaped.

7. Secondary part according to any one of the preceding claims, insofar as dependent on claim 3, wherein the first leg (3) has a flat side face, with which the first leg (3) bears against a flat side face of the yoke (6), wherein the second leg (3) has a flat side face, with which the second leg (3) bears against a flat side face of the yoke (6), in particular wherein the normal direction of the flat side face of the first leg (3) is oriented parallel to the direction of the spring force generated by the first spring element (10), and / or wherein the normal direction of the flat side face of the second leg (3) is oriented parallel to the direction of the spring force generated by the second spring element (10), in particular and to the normal direction of the flat side face of the first leg (3).

8. Secondary part according to any one of the preceding claims, wherein each of the bearing areas on the housing part (2) is formed integrally, in particular in one piece, and projects toward the ferrite core, in particular wherein the housing part (2) together with the bearing areas is formed as an injection-molded plastic part.

9. Secondary part according to any one of the preceding claims, wherein each of the foot regions on the coil carrier (1) is formed integrally, in particular in one piece, as an undercut on the coil carrier (1), in particular wherein the coil carrier (1) together with the foot regions is formed as an injection-molded plastic part.

10. Secondary part according to any one of the preceding claims, insofar as dependent on claim 3, wherein pocket-shaped receiving regions, in particular recesses, in which the legs (3) are received, are formed on the housing part (2).

11. Secondary part according to any one of the preceding claims, insofar as dependent on claim 3, wherein the yoke (6) projects through a through-opening of the coil carrier (1), wherein the ferrite core is enclosed by the base part (4) together with the housing part (2) in such a way as to form a housing.

12. Secondary part according to any one of the preceding claims, wherein a printed circuit board (8) is arranged between the base part (4) and the winding (5) and / or the coil carrier (1), wherein the connections of the winding (5) are routed to the printed circuit board (8) and are electrically connected to conductor tracks of the printed circuit board (8).

13. Secondary part according to the preceding claim, wherein an insulating layer, in particular an insulating panel, in particular for electrical insulation, is arranged between the printed circuit board (8) and the base part (4).

14. Secondary part according to any one of the preceding claims 12 or 13, wherein capacitors are mounted on the printed circuit board (8), which capacitors are electrically connected in series and / or in parallel with the winding (5).

15. System for inductively transmitting electrical power, comprising a secondary part according to any one of the preceding claims, wherein a line conductor, which is laid in an elongated manner, is arranged between two legs (3) of the ferrite core, in particular wherein the line conductor is at the same distance from both legs (3), and / or wherein the line conductor is oriented parallel to the surfaces of both legs (3), in particular wherein the line conductor is oriented perpendicular to the normal direction of the contact area between a yoke (6) of the ferrite core and the first and / or second leg (3).