Compact structure wireless power transmission busbar

Abstract

The application provides a compact wireless power transmission bus ring, comprising an outer winding, an inner winding and a shielding cover, the inner winding and the outer winding are arranged inside the shielding cover to shield the generated magnetic field from the outside, the shielding cover is composed of a plurality of detachable split shielding sheets which are circumferentially distributed, the split shielding sheets are combined and docked through side fixing members, and the shielding cover forms a polyhedral structure through the combined docking of the split shielding sheets to save space. The application wraps the inner and outer windings with an aluminum cavity and ensures sufficient structural strength, realizes the shielding of the magnetic field of the inner and outer windings and maintains the magnetic field coupling between the inner and outer windings, adopts a cage structure design, simplifies the mechanical structure and ensures the design of the structural strength and the mounting position.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, and more specifically, to a compact wireless power transmission bus ring. Background Technology

[0002] Bus rings are widely used in aerospace, aviation, marine, medical, and various precision instrument fields, and are a core component of high-precision turntables. Their function is to enable the transmission of electrical power or signals between two relatively continuously rotating parts, preventing wires from becoming entangled or broken during relative rotation.

[0003] A bus ring, also called a slip ring, current collector ring, or current collector ring, is used in any electromechanical system that requires continuous rotation while transmitting power and signals from a fixed position to a rotating position. Bus rings improve system performance, simplify system structure, and prevent wires from twisting during rotation.

[0004] Wireless power transfer bus rings are based on the principle of electromagnetic induction, achieving power transmission through the electromagnetic induction of inner and outer windings. The inner winding group acts as the rotor, and the outer winding group acts as the stator. There is no contact between the rotor and the stator, which solves the wear problem of traditional brushed bus rings and avoids poor contact. Furthermore, there is no need to replace the brushes, thus improving the reliability of the turntable. However, existing wireless power transfer bus rings have a complex mechanical structure, resulting in a large overall size, which makes them unsuitable for applications with space constraints. Summary of the Invention

[0005] In view of this, the present invention provides a compact wireless power transmission bus ring, which features a compact design and achieves good magnetic shielding and grounding.

[0006] The present invention provides a compact wireless power transmission bus ring, comprising: an outer ring assembly, an inner ring assembly, and a shielding cover, wherein the inner ring assembly and the outer ring assembly are disposed inside the shielding cover to shield the generated magnetic field from the outside.

[0007] The shielding cover is composed of multiple detachable split shielding plates evenly distributed around the circumference. The split shielding plates are connected and joined together by side fasteners. The shielding cover achieves space saving by forming a polyhedral structure through the connection and combination of multiple split shielding plates.

[0008] Furthermore, each of the separate shielding pieces has flanges on both sides, and the side fixing members have slots on both sides. The flanges and the slots engage to achieve the docking and assembly of the shielding cover.

[0009] Furthermore, it also includes an upper end plate and a lower end plate. The upper and lower parts of the side of the side fastener are symmetrically provided with threaded holes. The fixed connection with the upper end plate and the lower end plate is positioned by the slots of the upper end plate and the lower end plate. The upper end plate is provided with a turntable mounting hole for installing electrical equipment on the turntable.

[0010] Furthermore, the inner ring assembly includes an inner ring skeleton and an inner ring coil. The inner ring coil is wound on the inner ring skeleton, and the upper and lower end faces of the inner ring skeleton are respectively fixedly connected to an upper inner ring flange and an lower inner ring flange.

[0011] Preferably, the fixed connection is made by screws; the materials of the inner and outer ring skeletons are required to be able to be well penetrated by the magnetic field, so non-metallic materials need to be selected. Since the magnets installed on the skeleton are rigid and have poor impact resistance, the selection of the skeleton material needs to consider impact resistance. Considering the operating environment and requirements of the turntable, the skeleton material also needs to have a wide continuous operating temperature range, low water absorption and corrosion resistance. Therefore, both the inner and outer ring skeletons are made of polyoxymethylene (POM). POM has a continuous operating temperature range of -50 to 90 degrees Celsius and features impact resistance, low water absorption and corrosion resistance.

[0012] The inner ring skeleton, as well as the central holes of the upper and lower flanges of the inner ring, have rotating shafts that are used to shield the magnetic field of the inner ring.

[0013] The connection between the upper inner ring flange, the lower inner ring flange, and the rotating shaft is an interference fit.

[0014] Furthermore, the outer ring assembly includes an outer ring skeleton and an outer ring coil. The upper and lower end faces of the outer ring skeleton are respectively fixedly connected to an upper outer ring flange and an lower outer ring flange. The side fixing member is provided with screw holes for fixing the upper end plate, the lower end plate, and the upper and lower outer ring flanges.

[0015] Preferably, the fixed connection is made by screw connection to form a cage structure, which reserves the installation position for transmission equipment and power receiving equipment, and has sufficient mechanical strength to improve the overall strength of the turntable and prevent the relatively soft polyoxymethylene material inner and outer skeleton from bearing the forces in three directions during the movement of the whole machine.

[0016] The shielding cover, side fixing parts, outer ring upper flange, outer ring lower flange, inner ring upper flange, inner ring lower flange and upper and lower end plates are fixedly connected to form a cavity to enclose the inner and outer ring groups, shielding the magnetic fields of the outer and inner ring groups, while maintaining magnetic field coupling between the outer and inner ring groups.

[0017] Furthermore, an upper bearing and a lower bearing are respectively provided at the upper and lower ends of the rotating shaft, and the outer rings of the upper and lower bearings are connected to the outer ring upper flange and the outer ring lower flange by an interference fit.

[0018] Furthermore, the outer ring upper flange, outer ring lower flange, inner ring upper flange, inner ring lower flange, upper end plate, lower end plate, shielding cover, and rotating shaft are all made of aluminum.

[0019] Furthermore, the wireless power transmission bus ring is grounded through the contact of the inner ring, ball bearing, and outer ring of the upper and lower bearings.

[0020] The present invention also provides a power transmission device, including the wireless power transmission bus ring described above.

[0021] The advantages of the compact wireless power transfer bus ring of the present invention are that it uses an aluminum shield, side fixing parts, aluminum inner and outer flanges, and upper and lower end plates connected by screws to form an aluminum cavity to enclose the inner and outer windings, and ensures sufficient structural strength. It achieves shielding of the magnetic field of the inner and outer windings while maintaining magnetic field coupling between the inner and outer windings. The cage structure design simplifies the mechanical structure and ensures the design of structural strength and installation position. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is an external view of a compact wireless power transfer bus ring according to an embodiment of the present invention.

[0024] Figure 2 This is an assembly cross-sectional view of a compact wireless power transfer bus ring according to an embodiment of the present invention.

[0025] Figure 3 This is an exploded view of a compact wireless power transfer bus ring according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of a cage-like structure of a compact wireless power transfer bus ring according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the bearing installation of a compact wireless power transfer bus ring according to an embodiment of the present invention.

[0028] The reference numerals in the figure are as follows:

[0029] 1. Upper end plate; 2. Outer ring upper flange; 3. Upper bearing; 4. Inner ring upper flange; 5. Rotating shaft; 6. Inner ring assembly; 7. Inner ring lower flange; 8. Lower bearing; 9. Outer ring assembly; 10. Outer ring lower flange; 11. Side fastener; 12. Shielding cover; 13. Lower end plate; 14. Turntable mounting hole. Detailed Implementation

[0030] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] In the description of this invention, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] This invention solves the problems of magnetic shielding, structural strength and installation of the compact and improved wireless power transmission bus ring through structural design, while maintaining the same movement mode as the traditional brushed bus ring; the changing magnetic field of the inner and outer windings is shielded by inner and outer aluminum shielding covers to avoid interference with the electronic equipment installed on the bus ring; and the mechanical structure is simplified by bearing grounding.

[0034] The invention will now be described in detail with reference to the accompanying drawings:

[0035] See attached diagram. Figure 2 As shown, the present invention provides a compact wireless power transfer bus ring, comprising: an outer ring assembly 9, an inner ring assembly 6, a rotating shaft 5, an upper bearing 3, a lower bearing 8, an upper end plate 1, a lower end plate 13, and a side fixing member 11.

[0036] The outer ring group 9 is the stator, and the inner ring group 6 is the rotor;

[0037] The upper and lower ends of the outer ring assembly 9 are respectively fixedly connected to the outer ring upper flange 2 and the outer ring lower flange 10, and the outer ring assembly 9 is coaxial with the outer ring upper flange 2 and the outer ring lower flange 10.

[0038] The upper and lower ends of the inner ring assembly 6 are respectively fixedly connected to the upper inner ring flange 4 and the lower inner ring flange 7, and the inner ring assembly 6 is coaxial with the upper inner ring flange 4 and the lower inner ring flange 7.

[0039] The upper bearing 3 and the lower bearing 8 are respectively mounted on the outer ring upper flange 2 and the outer ring lower flange 10, and are coaxial with the outer ring upper flange 2 and the outer ring lower flange 10;

[0040] The inner bores of the upper bearing 3 and the lower bearing 8 are interference-fitted with a rotating shaft 5, and the upper inner ring flange 4 and the lower inner ring flange 7 are rotatably connected to the rotating shaft 5;

[0041] The outer ring upper flange 2 and the outer ring lower flange 10 are fixedly connected to the upper end plate 1, the lower end plate 13, and the side fixing member 11;

[0042] The compact wireless power transmission bus ring achieves grounding through the contact between the inner ring of the bearing, the balls of the bearing, and the outer ring of the bearing.

[0043] The middle part of the inner ring assembly 6 is a through hole through which the rotating shaft 5 passes.

[0044] The side fastener 11 has a slot for engaging the shielding cover 12.

[0045] The skeletons of the inner ring group 6 and the outer ring group 9 are made of polyoxymethylene.

[0046] The outer ring upper flange 2, outer ring lower flange 10, inner ring upper flange 4, inner ring lower flange 7, upper end plate 1, and lower end plate 13 are made of aluminum.

[0047] To improve the overall strength of the bus ring and prevent the relatively soft polyoxymethylene (POM) inner and outer skeleton from bearing forces in three directions during the movement of the entire machine, this invention features an aluminum cage structure. This structure also serves to shield electromagnetic fields. Preferably, four side fixing members are used, positioned by slots on the upper end plate 1 and lower end plate 13, and fixed to the upper end plate 1, lower end plate 13, and outer ring upper flange 2 and outer ring lower flange 10 by screws. The stator is then fixed in its relative mounting position by the screws on the end plates via the side fixing members 11. The turntable mounting hole 14 is located on the upper end plate 1. Due to the large thickness of the upper end plate 1 and the side fixing members 11, they can withstand significant external forces. The shielding cover 12 is inserted between the side fixing members 11 through slots, resisting the torsional torque between the upper end plate 1 and lower end plate 13. A schematic diagram of the cage structure is shown below. Figure 4 As shown;

[0048] The shielding cover 12 is made of aluminum. The aluminum shielding cover 12, the side fixing parts 11, the aluminum outer ring upper flange 2, the inner ring upper flange 4, the inner ring lower flange 7, the outer ring lower flange 10, the upper end plate 1, and the lower end plate 13 are connected by screws to form an aluminum cavity that encloses the inner ring group 6 and the outer ring group 9, ensuring sufficient structural strength. This achieves the shielding of the magnetic field of the inner ring group 6 and the outer ring group 9 while maintaining the magnetic field coupling between the inner ring group 6 and the outer ring group 9.

[0049] The rotating shaft 5 is made of aluminum, which provides magnetic shielding. The aluminum material can easily compensate for installation tolerances through a certain amount of deformation, thereby solving the equipment installation problem and simplifying and compacting the structure. The cage structure formed by the upper end plate 1, the lower end plate 13 and the side fixing parts 11 is used to fix the outer ring 9 and the bus ring as a whole, ensuring the structural strength and installability.

[0050] The side fixing component 11 is positioned by the slots of the upper end plate 1 and the lower end plate 13, and is fixedly connected to the upper end plate 1, the lower end plate 13, the upper outer ring flange 2, and the lower outer ring flange 10 by screws.

[0051] The outer rings of the upper bearing 3 and the lower bearing 8 are connected to the upper outer ring flange 2 and the lower outer ring flange 10 by an interference fit.

[0052] The inner ring upper flange 4 and inner ring lower flange 7 are connected to the rotating shaft 5 by an interference fit; the outer ring upper flange 2 and outer ring lower flange 10 serve as bearing seats, and the outer rings of the upper bearing 3 and lower bearing 8 are installed inside the outer ring flange by an interference fit, making the upper bearing 3 and lower bearing 8 coaxial with the outer ring upper flange 2 and outer ring lower flange 10; the upper end plate 1 and lower end plate 13 are connected to the outer ring upper flange 2 and outer ring upper flange 10 by screws to clamp the outer rings of the bearings, so that the bearings are fixed in the axial position relative to the outer ring upper flange 2 and outer ring lower flange 10. (See reference) Figure 5 As shown.

[0053] The inner ring upper flange 4 and inner ring lower flange 7 are connected to the rotating shaft 5 by interference fit, and the inner ring upper flange 4 and inner ring lower flange 7 act as shoulders relative to the rotating shaft 5. The rotating shaft 5 can be divided into different diameter segments to serve as journals and end faces. This design simplifies and reduces the size of the bus ring structure.

[0054] The inner ring upper flange 4, inner ring lower flange 7, outer ring upper flange 2, outer ring lower flange 10 at both ends of the bus ring are fixed to the aluminum shield 12 and the side fastener 11 by screws, so that the positions of the flanges at both ends are relatively fixed.

[0055] For the installation of electronic devices on the bus ring, the structural design of this invention achieves this through three screw holes on the rotating shaft 5; the electronic devices on the rotor can be fixed to the rotating shaft 5 by the screw holes on the rotating shaft 5. For the external view and exploded view of the compact wireless power transmission bus ring of this embodiment, please refer to the following: Figure 1 and Figure 3 As shown.

[0056] Wireless power transmission is based on the principle of electromagnetic induction. The outer winding coil's frame material must be able to be well penetrated by the magnetic field, requiring the selection of a non-metallic material. Furthermore, since the magnets mounted on the frame are relatively rigid and have poor impact resistance, the frame material selection must consider impact resistance. Considering the operating environment and requirements of the bus ring, the frame material also needs to have a wide continuous operating temperature range, low water absorption, and corrosion resistance. Polyoxymethylene (POM) material has a continuous operating temperature range of -50 to 90 degrees Celsius, as well as impact resistance, low water absorption, and corrosion resistance. Therefore, this solution selects POM as the material for the inner and outer winding coil frames.

[0057] The present invention also provides a power transmission device, including the wireless power transmission bus ring described above.

[0058] The advantages of the compact wireless power transfer bus ring of the present invention are that it uses an aluminum shield, side fixing parts, aluminum inner and outer flanges, and upper and lower end plates connected by screws to form an aluminum cavity to enclose the inner and outer windings, and ensures sufficient structural strength. This achieves shielding of the magnetic field of the inner and outer windings while maintaining magnetic field coupling between the inner and outer windings. The cage structure design simplifies the mechanical structure and ensures the design of structural strength and installation position.

[0059] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compact wireless power transfer bus ring, characterized in that, include: An outer ring group, an inner ring group, and a shielding cover, wherein the inner ring group and the outer ring group are disposed inside the shielding cover to shield the generated magnetic field from the outside world; The shielding cover is composed of multiple detachable split shielding plates evenly distributed around the perimeter. The split shielding plates are connected and joined together by side fasteners. The shielding cover achieves space saving by forming a polyhedral structure through the connection and combination of multiple split shielding plates. Each of the split shielding pieces has flanges on both sides, and the side fixing pieces have slots on both sides. The flanges and the slots engage to achieve the docking and assembly of the shielding cover. The compact wireless power transmission bus ring also includes an upper end plate and a lower end plate. The upper and lower parts of the side of the side fastener are symmetrically provided with threaded holes. The fixed connection with the upper end plate and the lower end plate is positioned by the slots of the upper end plate and the lower end plate. The upper end plate is provided with a turntable mounting hole for installing electrical equipment on the turntable. The inner ring assembly includes an inner ring skeleton and an inner ring coil. The inner ring coil is wound on the inner ring skeleton. The upper and lower end faces of the inner ring skeleton are respectively fixedly connected to an upper inner ring flange and an lower inner ring flange. A rotating shaft passes through the center holes of the inner ring skeleton, the upper inner ring flange, and the lower inner ring flange. The connection between the upper inner ring flange, the lower inner ring flange, and the rotating shaft is an interference fit. The upper and lower ends of the rotating shaft are respectively provided with an upper bearing and a lower bearing, and the outer rings of the upper and lower bearings are connected to the outer ring upper flange and the outer ring lower flange by an interference fit. The wireless power transmission bus ring is grounded through the contact of the inner ring, ball, and outer ring of the upper and lower bearings; The outer ring assembly includes an outer ring skeleton and an outer ring coil. The upper and lower end faces of the outer ring skeleton are respectively fixedly connected to an upper outer ring flange and an lower outer ring flange. The side fastener is provided with screw holes for fixing the upper end plate, the lower end plate, and the upper and lower outer ring flanges.

2. The compact wireless power transfer bus ring according to claim 1, characterized in that, The inner ring skeleton and the outer ring skeleton are made of polyoxymethylene.

3. The compact wireless power transfer bus ring according to claim 1, characterized in that, The outer ring upper flange, outer ring lower flange, inner ring upper flange, inner ring lower flange, upper end plate, lower end plate, shielding cover, and rotating shaft are all made of aluminum.

4. A power transmission device, characterized in that, Includes the wireless power transfer bus ring as described in any one of claims 1-3.

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