Coil comprising a winding body and winding, and system for the contactless transmission of electrical power to a mobile part
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SEW EURODRIVE GMBH & CO KG
- Filing Date
- 2025-12-11
- Publication Date
- 2026-07-30
Smart Images
Figure EP2025086555_30072026_PF_FP_ABST
Abstract
Description
[0001] Coil comprising a winding body and winding and system for contactless transmission of electrical power to a mobile device
[0002] Description:
[0003] The invention relates to a coil comprising a winding body and winding and a system for contactless transmission of electrical power to a mobile device.
[0004] It is generally known that a coil winding is provided on a coil support.
[0005] From JP H05 - 63014 U, a coil is known as the closest state of the art.
[0006] From DE 102010022 122 A1 an arrangement for inductive energy transfer to an electrical consumer is known.
[0007] From DE 102018004466 A1 an arrangement for inductive energy transfer is known.
[0008] From DE 102019215802 A1 a shape-adaptive holder for a core design is known.
[0009] The invention is therefore based on the objective of further developing a coil, whereby the highest possible performance should be enabled in a small installation space.
[0010] According to the invention, the problem is solved in the coil according to the features specified in claim 1 and in the system according to the features specified in claim 15.
[0011] Important features of the invention for the coil, comprising a winding body and a winding, are that the winding body has a hollow cylindrical base and a support area attached to it,
[0012] wherein the load-bearing area projects radially on the base body, in particular radially outwards.
[0013] ISI \ EIDOPAT 11.12.2025 An advantage of this is that a toroidal winding can be wound onto the base body, and the base body can be attached to a system or machine using the support area, as it projects radially beyond the winding. Thus, the support area can be attached to a wall of the system or to a machine part.
[0014] In an advantageous embodiment, the winding body is additively manufactured, particularly in that it has a non-solid filling structure and / or cavities forming a spatial lattice. An advantage of this is that the winding body can be manufactured in one piece, even though it has a complex geometry. Only a small amount of material is required, since the winding body is not solid but comprises a lattice-like arrangement of cavities. Alternatively, a solid design would be possible, although this would require more material.
[0015] In an advantageous embodiment, the winding is wound onto the base body, particularly as a toroidal winding. An advantage of this is that no magnetic field is present along the cylinder axis and along a hollow cylinder surrounding the base body, which is aligned coaxially with the hollow cylindrical base body, when the winding is energized.
[0016] In an advantageous embodiment, the base body has, in particular, non-continuous axial slots,
[0017] In particular, the axial direction is aligned parallel to the cylinder axis of the hollow cylindrical base body. An advantage of this is that the axial slots provide improved heat transfer.
[0018] In an advantageous embodiment, the edges, especially circular edges, of the cylinder are rounded and / or chamfered. This is advantageous because the winding is not damaged, and in particular, its service life is increased, since the winding wire can be wound over the edge without kinking.
[0019] In an advantageous embodiment, the area covered by the support area in the radial direction includes the area covered by the winding in the radial direction. It is advantageous that the support area projects radially beyond the winding. Thus, the fastening does not interfere with the winding. In particular, the winding's supply and return lines can be routed axially above or below the support area.
[0020] In an advantageous embodiment, the angular area covered by the bearing area in the circumferential direction, particularly on the cylinder axis of the hollow cylindrical base body, is smaller than the circumferentially measured distance between two nearest turns of the winding. It is advantageous that the bearing area only minimally restricts the winding in the circumferential direction.
[0021] In an advantageous embodiment, radially directed holes, particularly stepped holes, are formed in the support area, through which screws protrude radially outwards, with the screw head of each screw bearing against a step of the respective hole. It is advantageous that screws can be used to attach the coil to a part of a machine or system.
[0022] In an advantageous embodiment, an axially directed recess is formed in the support area, into which at least one radially extending hole through the support area opens, in particular through which a screw projects, especially the threaded portion of which projects radially from the support area. It is advantageous that screws can be used to attach the coil to a part of a machine or system.
[0023] In an alternative, advantageous embodiment, screws are screwed into the load-bearing area. The advantage here is that simple fastening is possible. The screws can be spaced apart axially, and the load-bearing area has a wall thickness sufficient for screwing in the screws in the region surrounding them.
[0024] In an advantageous embodiment, the wall thickness of the load-bearing area is increased in the area around the screws.
[0025] In particular, the wall thickness of the load-bearing area decreases monotonically with increasing distance to the nearest screw. The advantage here is that sufficient wall thickness is present, thus enabling stable fastening of the screws.
[0026] In a preferred embodiment, the slot width of the axial slots is smaller than the width of a human finger. This has the advantage of ensuring safety.
[0027] In an advantageous embodiment, the area covered by the support surface in the axial direction includes the area covered by the base body in the axial direction. This is advantageous because it enables stable fastening.
[0028] In an advantageous embodiment, the area covered by the support area in the circumferential direction is smaller than twice the circumferentially measured distance between two nearest axial slots. The advantage here is that the support area occupies very little installation space while still enabling stable mounting. In an advantageous embodiment, the inlet and outlet of the winding are located within the circumferential angular area covered by the support area with respect to the cylinder axis of the hollow cylindrical base body.
[0029] In particular, the windings are spaced regularly and / or uniformly apart from each other, especially in the circumferential direction. An advantage of this is that the circumferential angle range available for the winding is only slightly reduced by the bearing area.
[0030] In an advantageous embodiment, each turn of the winding is arranged within a circumferential angular region covered by one of the axial slots of the base body. An advantage of this is that improved heat dissipation is achieved, as a cooling airflow passes over the winding wire.
[0031] Key features of the system for contactless transmission of electrical power to a mobile device are that a linear conductor laid in the system is electrically arranged in series with a coil according to one of the preceding claims,
[0032] wherein such capacitors are connected in series and / or parallel to the line conductor and / or the coil such that the resonant frequency of the resonant circuit formed from the coil, the line conductor and the capacitors is equal to the frequency of the alternating current impressed into the line conductor by a current source of the system,
[0033] wherein the handset has a secondary winding inductively coupled to the line conductor, from which a consumer, in particular an electric traction drive, of the handset can be supplied.
[0034] in particular where the frequency is between 10 and 1000 kHz.
[0035] An advantage of this design is that, during installation of the line conductor in the system, the line inductance of the elongated line conductor can be adjusted to the desired value for resonant operation using the coil provided in series. This is because a capacitor is connected to the line conductor, ensuring that the resonant frequency of the resulting resonant circuit matches the frequency of the alternating current impressed into the line conductor by a power source. Since a large amount of power, particularly in the kilowatt range, is transmitted to the mobile device, a high current can be impressed into the line conductor. The resulting ohmic power loss in the winding can be dissipated to the environment, especially by a convective or actively driven airflow.
[0036] 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. The invention will now be explained in more detail with reference to a schematic diagram:
[0037] Figure 1 shows a coil according to the invention, in particular an impedance, in an oblique view.
[0038] Figure 2 shows a top view of the coil.
[0039] Figure 3 shows the winding body 1 of the coil in an oblique view.
[0040] As shown in the figures, the coil has the hollow cylindrical winding body 1 around which a toroidal winding 4 is wound.
[0041] The winding body 1 has a hollow cylindrical base body 2, which is made in one piece and / or in one part with a support area 3.
[0042] Preferably, the winding body 1 is designed as a plastic injection molded part or as an additively manufactured part, in particular by means of a 3D printer.
[0043] The base body 2 has non-continuous axial slots 6, which are uniformly spaced apart from each other in the circumferential direction, except for the circumferential angle area covered by the support area 3 in the circumferential direction.
[0044] Preferably, the winding body 1 has a non-solid filling structure.
[0045] The edges of the hollow cylindrical base body 2 are preferably rounded and / or chamfered.
[0046] The support area 3 projects radially from the base body 2, particularly in the circumferential angle area covered by the support area 3 in the circumferential direction.
[0047] In the support area 3, radially oriented, through holes are formed, each with a stepped design. Screws 5 can be inserted into these holes, the head of each screw being supported by a step in the respective stepped hole. A nut 8, in particular a threaded nut, can be screwed onto the threaded portion of each screw 5, which projects radially from the support area 3. This allows for simple fastening of the winding carrier in a machine or system. For example, the machine or system has a sheet metal plate with holes through which the threaded portions of the screws 5 protrude, so that the nuts 8 are located on the side of the plate facing away from the support area 3.
[0048] For screwing, a tool, in particular a ball head screwdriver, can be passed through a recess 7 extending axially to the holes.
[0049] The circumferential width of the axial slots 6 decreases monotonically with increasing axial distance to the center of gravity of the winding body 1.
[0050] The wall thickness of the load-bearing area 3 is increased in the area around the screws 5.
[0051] In particular, the wall thickness of the load-bearing area 3 decreases monotonically with increasing distance to the nearest screw 5.
[0052] The slot width of the axial slots 6 is each smaller than the width of a human finger, particularly to prevent the risk of accidents.
[0053] The area covered by the support area 3 in the axial direction includes the area covered by the base body 2 in the axial direction.
[0054] The area covered by the support area 3 in the circumferential direction is less than twice the circumferentially measured distance between two nearest axial slots 6. Thus, the toroidal winding can be executed uniformly, and the supply and return of the winding 4 can be carried out in the circumferential angle area covered by the support area 3, whereby a regular and / or uniform spacing of the winding wire can be maintained.
[0055] Each of the turns of the winding 4 can be arranged within a circumferential angle range covered by one of the axial slots 6. This allows for improved cooling. The winding body is preferably made of plastic, in particular additively manufactured or as a plastic injection-molded part.
[0056] The base body 2 additionally has radially through holes 30, through which a cable tie can be passed, which presses the winding, in particular the winding wire, against the base body 2 and thus stabilizes and secures the winding.
[0057] In further embodiments of the invention, the winding body 1 is made of ceramic. This allows for improved heat dissipation. Reference numeral list
[0058] 1 winding body
[0059] 2 hollow cylindrical base bodies
[0060] 3 Carrying area
[0061] 4 windings
[0062] 5 screws
[0063] 6 axial slots
[0064] 7 Exclusion
[0065] 8 nuts, especially screw nuts, 30 radially through holes
Claims
Patent claims:
1. Coil comprising a winding body and a winding, wherein the winding body has a hollow cylindrical base body and a supporting area attached to it, characterized by the fact that 1. The load-bearing area projects radially from the base body, in particular radially outwards.
2. Coil comprising a winding body and a winding. wherein the winding body has a hollow cylindrical base body and a supporting area attached to it, wherein the load-bearing area projects radially, in particular radially outwards, from the base body, wherein the base body in particular has non-continuous axial slots, wherein the angular range covered by the bearing area in the circumferential direction is smaller than the circumferentially measured distance between two nearest turns of the winding.
3. Coil according to claim 1 or 2, characterized by the fact that the winding body is additively manufactured, in particular having a non-solid filling structure and / or cavities forming a spatial grid.
4. Coil according to any of the preceding claims, characterized by the fact that the winding is wound onto the base body, in particular as a toroidal winding.
5. Coil according to any of the preceding claims, characterized by the fact that the base body in particular has non-continuous axial slots, in particular wherein the axial direction is aligned parallel to the cylinder axis of the hollow cylindrical base body.
6. Coil according to any of the preceding claims, characterized by the fact that the edges, especially circular edges, of the cylinder are rounded and / or chamfered, and / or that The area covered by the load-bearing area in a radial direction includes and / or exceeds and / or contains the area covered by the winding in a radial direction.
7. Coil according to any of the preceding claims, characterized by the fact that The angular area covered by the bearing area in the circumferential direction, particularly on the cylinder axis of the hollow cylindrical base body, is smaller than the circumferentially measured distance between two nearest turns of the winding.
8. Coil according to one of the preceding claims, characterized in that radially directed holes, in particular stepped holes, are formed in the load-bearing area, through which screws protrude radially outwards, in particular where the screw head of the respective screw rests against a step of the respective hole, and / or that in the load-bearing area an axially directed recess is formed into which at least one radially through-the-loading area hole opens, in particular through which a screw protrudes, in particular whose thread area protrudes radially from the load-bearing area.
9. Coil according to any of the preceding claims, characterized by the fact that the wall thickness of the load-bearing area is increased in the area around the screws, in particular, the wall thickness of the load-bearing area decreases monotonically with increasing distance to the nearest screw.
10. Coil according to any of the preceding claims, characterized by the fact that The slot width of the axial slots is each smaller than the width of a human finger.
11. Coil according to any of the preceding claims, characterized by the fact that The area covered by the load-bearing area in the axial direction includes the area covered by the base body in the axial direction. and / or that radially through holes (30) are formed in the base body.
12. Coil according to one of the preceding claims, characterized by the fact that the area covered by the bearing area in the circumferential direction is smaller than twice the circumferentially measured distance between two nearest axial slots.
13. Coil according to any of the preceding claims, characterized by the fact that the supply and discharge of the winding is carried out in the circumferential angle area covered by the support area with respect to the cylinder axis of the hollow cylindrical base body, in particular wherein the windings are regularly and / or uniformly spaced apart from each other, especially in the circumferential direction.
14. Coil according to any of the preceding claims, characterized by the fact that Each of the windings is arranged in a circumferential angle range covered by one of the axial slots of the base body.
15. System for contactless transmission of electrical power to a handset, wherein a line conductor laid in an elongated position in the system is electrically arranged in series with a coil according to one of the preceding claims, wherein such capacitors are connected in series and / or parallel to the line conductor and / or the coil such that the resonant frequency of the resonant circuit formed from the coil, the line conductor and the capacitors is equal to the frequency of the alternating current impressed into the line conductor by a current source of the system, wherein the handset has a secondary winding inductively coupled to the line conductor, from which a consumer, in particular an electric traction drive, of the handset can be supplied. in particular where the frequency is between 10 and 1000 kHz.