A coil unit and a coil array

Abstract

The application provides a coil unit and a coil array, comprising a coil body and a magnetic shielding layer; the coil body is configured to allow a current flowing therethrough to form a current loop, and the coil body comprises at least a first wire segment, a second wire segment and a third wire segment connected in sequence; the first wire segment and the third wire segment both extend along a first direction and are spaced apart along a second direction; the second wire segment extends along the second direction; and the first direction and the second direction are arranged transversely; the magnetic shielding layer has a thickness dimension along the second direction; at least part of the thickness of the magnetic shielding layer along the second direction is located between the first wire segment and the third wire segment; and the second wire segment passes through at least part of the thickness of the magnetic shielding layer along the second direction.

Description

Technical Field

[0001] This application belongs to the field of wireless power transmission technology, and more specifically, relates to a coil unit and coil array. Background Technology

[0002] Generally, the battery life of miniature wireless devices is limited, and replacing batteries can negatively impact the research process and data, making it difficult to achieve long-term, interference-free power supply. Therefore, wireless power transmission technology is a better alternative to batteries. However, providing power to miniature wireless devices via wireless power transmission systems presents certain challenges. For example, it may be necessary to provide power to multiple freely moving targets within the observation range, each carrying a miniature wireless device to receive power from the wireless power transmission system.

[0003] The related problems to be solved include: First, the design of the wireless power transmission system must ensure that the miniature wireless device can continuously receive stable power; second, the designed wireless power transmission system must be able to provide power to multiple mobile targets simultaneously, and these mobile targets are in a continuous process of movement; third, in order to ensure that multiple mobile targets have sufficient free space to move while maintaining the miniaturization of the receiving wireless device, the ratio between the size of the transmitting coil in the wireless power transmission system and the size of the receiving coil in the miniature wireless device is usually very large. When there is a misalignment problem between the coils, the coupling coefficient between them will be very small, and the power transmission efficiency will be significantly reduced.

[0004] Specifically, when the transmitting and receiving coils are misaligned, the coupling coefficient between them decreases rapidly, and the transmission efficiency between the transmitting and receiving coils decreases synchronously, severely limiting the stability and directional freedom of the wireless power transmission system. However, in practical applications, misalignment between the transmitting and receiving coils is difficult to avoid when the receiving end is moving.

[0005] In summary, there is an urgent need for a wireless power transmission system that can provide dynamic and stable charging to micro wireless devices under weak coupling conditions and with proper shielding of adverse magnetic fields. This system has a high degree of freedom in charging position and charging angle, and can ensure that multiple micro wireless devices within a certain range can be supplied with the required power regardless of their position and orientation. Summary of the Invention

[0006] The purpose of this application is to provide a coil unit and a coil array. A wireless power transmission system using this coil unit and coil array has good shielding capability against undesirable magnetic fields. By shielding undesirable magnetic fields, the magnetic field required for transmission is optimally polarized and distributed. Furthermore, by accurately predicting the polarization and distribution of the shielded magnetic field, the wireless power transmission system can be optimally designed.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] A coil unit is provided, the coil unit comprising a coil body and a magnetic shielding layer;

[0009] The coil body is configured to allow the current flowing through it to form a current loop. The coil body includes at least a first wire segment, a second wire segment, and a third wire segment connected in sequence. The first wire segment and the third wire segment both extend along a first direction and are spaced apart along a second direction. The second wire segment extends along the second direction. The first direction and the second direction are intersected.

[0010] The magnetic shielding layer has a thickness dimension along the second direction, and at least a portion of the thickness of the magnetic shielding layer along the second direction is located between the first line segment and the third line segment, and the second line segment passes through at least a portion of the thickness of the magnetic shielding layer along the second direction.

[0011] In some embodiments, the first wire segment and the third wire segment are arranged in parallel, the first direction and the second direction are perpendicular to each other, and the plane where the coil body is located and the plane where the magnetic shielding layer is located are perpendicular to each other.

[0012] In some embodiments, the magnetic shielding layer includes a first material layer and a second material layer, which are stacked along the second direction; wherein the first material layer (1021) is configured to achieve shielding by absorbing the magnetic field to be shielded, and the second material layer (1022) is configured to achieve shielding by reflecting the magnetic field to be shielded.

[0013] Furthermore, the third line segment is located between the first material layer and the second material layer, the first line segment is located on the side of the first material layer opposite to the second material layer, and the second line segment passes through the first material layer.

[0014] In some embodiments, the magnetic shielding layer includes a first material layer and a second material layer, wherein the first material layer and the second material layer are stacked along the second direction;

[0015] Furthermore, the entire thickness of the magnetic shielding layer along the second direction lies between the first linear segment and the third linear segment, and the second linear segment passes through the entire thickness of the magnetic shielding layer along the second direction.

[0016] In some embodiments, the coil body includes a plurality of first wire segments, a plurality of second wire segments, and a plurality of third wire segments;

[0017] Multiple first line segments are arranged in sequence along the first direction, multiple second line segments are arranged in sequence along the first direction, multiple first line segments and multiple second line segments are arranged alternately along the first direction, and any adjacent first line segments and second line segments are connected by second line segments.

[0018] In some embodiments, the coil body includes a first wire layer and a second wire layer stacked together, and any wire layer includes a plurality of first wire segments, a plurality of second wire segments and a plurality of third wire segments;

[0019] Furthermore, any first wire segment in the first wire layer is disposed between two adjacent first wire segments in the second wire layer, and any second wire segment in the first wire layer is disposed between two adjacent second wire segments in the second wire layer. The plurality of second wire segments in the first wire layer and the plurality of second wire segments in the second wire layer are stacked one-to-one. The first wire layer and the second wire layer are configured such that the directions of the currents allowed to flow through them are opposite.

[0020] In some embodiments, the coil body is formed by winding a single wire, a portion of which is wound to form the first wire layer, and another portion of which is wound to form the second wire layer.

[0021] In some embodiments, the coil body includes a first wire loop and a second wire loop, wherein the first wire loop and the second wire loop each include a first wire segment, a second wire segment and a third wire segment;

[0022] The first wire loop and the second wire loop are staggered or partially stacked along the first direction, and the first wire loop and the second wire loop are configured such that the directions of the current allowed to flow through them are opposite.

[0023] In some embodiments, the coil body includes a plurality of first wire loops and a plurality of second wire loops;

[0024] Multiple first linear loops are arranged along a first direction, with any two adjacent first linear loops staggered or partially stacked along the first direction; multiple second linear loops are arranged along a first direction, with any two adjacent second linear loops staggered or partially stacked along the first direction; any adjacent first linear loops and second linear loops are staggered or partially stacked along the first direction.

[0025] The beneficial effects of the coil unit provided in this application are as follows:

[0026] Compared with existing technologies, the coil unit provided in this application includes a coil body and a magnetic shielding layer. The coil body itself constitutes a current loop, which can be connected to external current through positive and negative terminals. The external current flows through the coil body to form a current loop. The first, second, and third wire segments are connected sequentially. The first and third wire segments extend along a first direction and are spaced apart along a second direction. The second wire segment extends along the second direction, and the first and second directions intersect. The magnetic shielding layer is used to shield undesirable magnetic fields, that is, to shield magnetic fields unwanted in the wireless power transmission process. The magnetic shielding layer has a thickness dimension along the second direction, and at least a portion of the thickness of the magnetic shielding layer along the second direction lies between the first and third wire segments. The second wire segment passes through at least a portion of the thickness of the magnetic shielding layer along the second direction. Thus, the magnetic shielding layer is treated as a fabric, and the coil body is woven onto the magnetic shielding layer by stitching.

[0027] When an electric current is applied, the first, second, and third wire segments can all generate magnetic fields. Since the first and third wire segments are separated by at least a portion of the thickness of the magnetic shielding layer, the first wire segment is located on the upper side of the magnetic shielding layer to form the upper layer, and the third wire segment is located in the middle or lower side of the magnetic shielding layer to form the lower layer. The magnetic field generated by the upper layer is used as the magnetic field required for wireless power transmission, while the magnetic field generated by the lower layer is shielded by the magnetic shielding layer as an undesirable magnetic field.

[0028] By designing the specific layer structure of the magnetic shielding layer, its shielding effect can be predicted. The shielding effect can be used to accurately predict the polarization and distribution of the magnetic field required after magnetic shielding. Then, based on the specific polarization and distribution, the coil body and the coil array used can be optimized, so that the wireless power transmission system using the coil unit and coil array has good shielding capability against adverse magnetic fields. Furthermore, by accurately predicting the polarization and distribution of the magnetic field after shielding, the wireless power transmission system can be optimized.

[0029] Another object of this application is to provide a coil array comprising at least two coil units as described above, wherein the at least two coil units are arranged in a predetermined manner to form the coil array.

[0030] The advantages of the coil array provided in this application compared to the prior art are the same as the advantages of the coil unit provided in this application compared to the prior art, and will not be repeated here. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a diagram illustrating the effect of magnetic field polarization produced by using four coils in existing technology.

[0033] Figure 2a and Figure 2b A schematic diagram of a coil array provided in an embodiment of this application;

[0034] Figure 2c and Figure 2d The diagram shows the effect of magnetic field polarization generated by the coil structure with three coil units provided in the embodiments of this application.

[0035] Figures 3a to 3c A schematic diagram of a coil unit provided in an embodiment of this application;

[0036] Figure 4a The magnetic flux density B is shown, considering only the first linear layer. u At the observation height h1 = 0.1m, the total magnetic flux density |B t The distribution of |;

[0037] Figure 4b The magnetic flux density B of the first linear layer is shown when the observation heights h1 = 0.1 m and h2 = 0.06 m. u The magnetic flux density B of the second linear layer l Total magnetic flux density |B t The distribution of |;

[0038] Figure 5a and Figure 5b The observed heights h1 = 0.1m and h... v Configuration of the coil array at 0.2m;

[0039] Figure 5c The magnetic flux density B is shown considering only the first linear layer. u Total magnetic flux density at time |B t The distribution of |;

[0040] Figure 5d The magnetic flux density B is shown considering only the second body segment. v Total magnetic flux density at time |B t The distribution of |;

[0041] Figure 6a and Figure 6b The observed heights h1 = 0.1m and h... v Configuration of the coil array when h1 = 0.4m and h2 = 0.06m;

[0042] Figure 6c The magnetic flux density B is shown considering only the first linear layer. u The magnetic flux density B of the second linear segment v Side coil B s Total magnetic flux density at time |B t The distribution of |;

[0043] Figure 6d The magnetic flux density B is shown considering only the second body segment. v The distribution of the total magnetic flux density |Bt| at time;

[0044] Figure 7 A schematic diagram of a coil unit provided in an embodiment of this application;

[0045] Figure 8 It shows that it can be equivalent to Figure 7 The actual windings of multiple small coils in the circuit;

[0046] Figure 9 Part (a) shows the actual winding of the coil, and part (b) shows the equivalent winding of part (a).

[0047] Figure 10 Showing Figure 9 Simulation results of two winding technologies, part (a) and part (b); Figure 11a and Figure 11b The magnetic field trajectories and distributions of two different coil configurations at different observation points are shown after the application of a magnetic shielding layer.

[0048] The following are the labeling elements in the figure:

[0049] 1000, Coil Array; 100, Coil Structure; 10, Coil Unit;

[0050] 101. Coil body; 102. Magnetic shielding layer;

[0051] 101a, First mitochondrial layer; 101b, Second mitochondrial layer;

[0052] 101c, First filament ring; 101d, Second filament ring;

[0053] 1011, First line segment; 1012, Second line segment; 1013, Third line segment;

[0054] 1021, First material layer; 1022, Second material layer. Detailed Implementation

[0055] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0056] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0057] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 limitations on this application.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] The coil unit, coil array, and wireless power transmission system provided in the embodiments of this application will now be described.

[0060] Please see Figures 2a to 11b As shown, the coil unit 10 provided in this embodiment includes a coil body 101 and a magnetic shielding layer 102. The coil body 101 is configured to allow the current flowing through it to form a current loop. The coil body 101 includes at least a first wire segment 1011, a second wire segment 1012, and a third wire segment 1013 connected in sequence. The first wire segment 1011 and the third wire segment 1013 both extend along a first direction and are spaced apart along a second direction. The second wire segment 1012 extends along the second direction, and the first and second directions are intersected.

[0061] The phrase "the first direction and the second direction are intersecting" means that the first direction and the second direction can intersect at any angle, including but not limited to the first direction and the second direction being perpendicular to each other, or the first direction and the second direction being at an acute or obtuse angle. In some specific embodiments, the first direction and the second direction are perpendicular.

[0062] The magnetic shielding layer 102 has a thickness dimension along the second direction, and at least a portion of the thickness of the magnetic shielding layer 102 along the second direction is located between the first linear segment 1011 and the third linear segment 1013. The second linear segment 1012 passes through at least a portion of the thickness of the magnetic shielding layer 102 along the second direction.

[0063] In some embodiments, such as Figure 3a As shown, the first and second directions are explained using an xyz rectangular coordinate system as an example. The first direction can refer to either the positive or negative direction of the y-axis. For example, in... Figure 3a In the diagram, the first line segment 1011 extends along the positive y-axis, and the third line segment 1013 extends along the positive y-axis. For example, in... Figure 3a In the diagram, the first line segment 1011 extends along the positive y-axis, and the third line segment 1013 extends along the negative y-axis. The second direction can refer to either the positive or negative z-axis. For example, in... Figure 3a In this context, the second direction extends along either the positive or negative z-axis.

[0064] This application does not specifically limit the axes in which the first direction and the second direction are located in the Cartesian coordinate system, but only limits the relationship between the first direction and the second direction.

[0065] The coil unit 10 provided in this embodiment includes a coil body 101 and a magnetic shielding layer 102. The coil body 101 itself constitutes a current loop, which can be connected to external current through positive and negative terminals. The external current flows through the coil body 101 to form a current loop. The first wire segment 1011, the second wire segment 1012, and the third wire segment 1013 are connected sequentially. The first wire segment 1011 and the third wire segment 1013 both extend along a first direction and are spaced apart along a second direction. The second wire segment 1012 extends along the second direction, and the first and second directions are intersected. The magnetic shielding layer 102 is used to shield some undesirable magnetic fields, that is, to shield unwanted magnetic fields in the wireless power transmission process. The magnetic shielding layer 102 has a thickness dimension along the second direction. At least a portion of the thickness of the magnetic shielding layer 102 along the second direction is located between the first wire segment 1011 and the third wire segment 1013. The second wire segment 1012 passes through at least a portion of the thickness of the magnetic shielding layer 102 along the second direction. Thus, the magnetic shielding layer 102 is likened to a fabric, and the coil body 101 is woven onto the magnetic shielding layer 102 by a "stitching" method.

[0066] When an electric current is applied, the first wire segment 1011, the second wire segment 1012, and the third wire segment 1013 can all generate magnetic fields. Since the first wire segment 1011 and the third wire segment 1013 are separated by at least a portion of the thickness of the magnetic shielding layer 102, the first wire segment 1011 is located on the upper side of the magnetic shielding layer 102 to form an upper layer, and the third wire segment 1013 is located in the middle or on the lower side of the magnetic shielding layer 102 to form a lower layer. The magnetic field generated by the upper layer is used as the magnetic field required for wireless power transmission, and the magnetic field generated by the lower layer is partially shielded by the magnetic shielding layer 102 as the magnetic field that needs to be shielded in the design.

[0067] By designing the specific layer structure of the magnetic shielding layer 102, its shielding effect can be predicted. Based on the shielding effect, the polarization and distribution of the required magnetic field after shielding can be accurately predicted. Then, based on the specific polarization and distribution, the coil array 1000 applied to the coil body 101 can be optimized, so that the wireless power transmission system using the coil unit 10 and the coil array 1000 has good shielding capability against the magnetic field. Furthermore, by accurately predicting the polarization and distribution of the magnetic field after shielding, the wireless power transmission system can be optimized.

[0068] In some embodiments, the first wire segment 1011 and the third wire segment 1013 are arranged in parallel, with the first direction and the second direction perpendicular to each other, and the plane containing the coil body 101 and the plane containing the magnetic shielding layer 102 are perpendicular to each other. This parallel and perpendicular arrangement allows for a more regular structure of the entire coil unit 10 and facilitates better parameter design and testing of the generated magnetic field.

[0069] In some embodiments, the magnetic shielding layer 102 includes a first material layer 1021 and a second material layer 1022, which are stacked along a second direction. The first material layer 1021 is configured to achieve shielding by absorbing the magnetic field to be shielded, and the second material layer 1022 is configured to achieve shielding by reflecting the magnetic field to be shielded. Furthermore, a third linear segment 1013 is located between the first material layer 1021 and the second material layer 1022, with the first linear segment 1011 located on the side of the first material layer 1021 facing away from the second material layer 1022, and the second linear segment 1012 passing through the first material layer 1021.

[0070] For example, such as Figure 7As shown, the first material layer 1021 and the second material layer are stacked and spaced apart along the second direction. A hole structure penetrating the thickness of the first material layer 1021 can be formed in the first material layer 1021. The first linear segment 1011 is vertically bent and extended to form the second linear segment 1012. The second linear segment 1012 passes through the hole structure, is then vertically bent and extended to form the third linear segment 1013. Of course, the design scheme of the magnetic shielding layer 102 provided in this embodiment can also be applied to, for example... Figure 3a On the coil body 101 shown.

[0071] In some embodiments, the magnetic shielding layer 102 includes a first material layer 1021 and a second material layer 1022, which are stacked along a second direction. Furthermore, the entire thickness of the magnetic shielding layer 102 along the second direction lies between the first linear segment 1011 and the third linear segment 1013, and the second linear segment 1012 extends through the entire thickness of the magnetic shielding layer 102 along the second direction.

[0072] For example, such as Figure 3a As shown, the first material layer 1021 and the second material layer 1022 are stacked and closely attached along the second direction. A hole structure is formed in the magnetic shielding layer 102, penetrating the total thickness of the first material layer 1021 and the second material layer 1022. The first linear segment 1011 is vertically bent and extended to form the second linear segment 1012. The second linear segment 1012 passes through the hole structure, is then vertically bent and extended to form the third linear segment 1013. Of course, the design scheme of the magnetic shielding layer 102 provided in this embodiment can also be applied to other applications such as... Figure 7 On the coil body 101 shown.

[0073] In some embodiments, the first material layer 1021 may be selected as a ferrite material, and the second material layer 1022 may be selected as an aluminum material.

[0074] The first material layer 1021 mainly achieves shielding by absorbing the unwanted magnetic field generated by the coil body 101, while the second material layer 1022 mainly achieves shielding by reflecting the unwanted magnetic field generated by the coil body 101. The combined use of the first material layer 1021 and the second material layer 1022 ensures the shielding effect against unwanted magnetic fields without significantly reducing the strength of the magnetic field that needs to generate wireless power.

[0075] More specifically, the shielding method of the first material layer 1021 is to attract and guide the magnetic field along the path of least magnetic resistance by using a magnetic material with high permeability, thereby effectively guiding it away from the protected area or confining it to the desired area. In this embodiment, placing the ferrite material above the third linear segment 1013 can effectively absorb and shield magnetic interference from the third linear segment 1013.

[0076] More specifically, the shielding method of the second material layer 1022 is eddy current shielding, which neutralizes unwanted magnetic fields by generating a canceling magnetic field. For example, the initial magnetic field generated by the third coil segment 1013 will generate circulating eddy currents in the aluminum plate, which in turn will generate a magnetic field opposite to the initial magnetic field. For example, placing an aluminum plate above the third coil segment 1013 can not only reduce unwanted magnetic fields but also significantly reduce magnetic flux density. Alternatively, placing an aluminum plate below the third coil segment 1013 can effectively reduce magnetic field leakage at the bottom of the coil body 101. Through the combined use of the first material layer 1021 and the second material layer 1022, unwanted magnetic fields are shielded to the maximum extent.

[0077] Furthermore, by using precise amplitude modulation technology to predict the current direction of the coil body 101, and combining this with the shielding of unwanted magnetic fields by the magnetic shielding layer 102 to obtain the optimal magnetic field polarization and distribution, the design freedom of the required coil structure 100 and coil array 1000 will be greatly improved, allowing for different magnetic field polarization and distribution according to specific wireless power application requirements and scenarios.

[0078] In some embodiments, the coil body 101 includes a plurality of first wire segments 1011, a plurality of second wire segments 1012, and a plurality of third wire segments 1013. The plurality of first wire segments 1011 are arranged sequentially along a first direction, the plurality of third wire segments 1013 are arranged sequentially along the first direction, and the plurality of first wire segments 1011 and the plurality of third wire segments 1013 are arranged alternately along the first direction. Any adjacent first wire segments 1011 and third wire segments 1013 are connected through second wire segments 1012.

[0079] Specifically, such as Figure 3a and Figure 3cAs shown, the first line segment 1011 extends along the positive y-axis, and after a vertical bend, extends along the negative z-axis to form the first second line segment 1012. The first second line segment 1012, after a vertical bend, continues to extend along the positive y-axis to form the first third line segment 1013. The first third line segment 1013, after a vertical bend, extends along the positive z-axis to form the second second line segment 1012. The second second line segment 1012, after a vertical bend, continues to extend along the positive y-axis to form the second first line segment 1011. 11. The second first line segment 1011 extends along the positive direction of the y-axis, and after a vertical bend, extends along the negative direction of the z-axis to form the third second line segment 1012. The third second line segment 1012 continues to extend along the positive direction of the y-axis after a vertical bend to form the second third line segment 1013, and so on, so that multiple first line segments 1011 are arranged in sequence along the first direction, and multiple third line segments 1013 are arranged in sequence along the first direction, and multiple first line segments 1011 and multiple third line segments 1013 are arranged alternately along the first direction.

[0080] In some embodiments, such as Figures 7 to 8 As shown, the coil body 101 includes a first wire layer 101a and a second wire layer 101b stacked together. Each wire layer includes multiple first wire segments 1011, multiple second wire segments 1012, and multiple third wire segments 1013. Furthermore, any first wire segment 1011 in the first wire layer 101a is disposed between two adjacent first wire segments 1011 in the second wire layer 101b, and any second wire segment 1012 in the first wire layer 101a is disposed between two adjacent second wire segments 1012 in the second wire layer 101b. The multiple second wire segments 1012 in the first wire layer 101a and the multiple second wire segments 1012 in the second wire layer 101b are stacked one-to-one. The first wire layer 101a and the second wire layer 101b are configured such that the directions of the currents allowed to flow through them are opposite.

[0081] Specifically, such as Figures 3a to 3bAs shown, the first line segment 1011 extends along the positive y-axis, and after a vertical bend, extends along the negative z-axis to form the first second line segment 1012. The first second line segment 1012, after a vertical bend, continues to extend along the positive y-axis to form the first third line segment 1013. The first third line segment 1013, after a vertical bend, extends along the positive z-axis to form the second second line segment 1012. The second second line segment 1011... After being bent vertically, 012 continues to extend along the positive direction of the y-axis to form the second first linear segment 1011. The second first linear segment 1011 extends along the positive direction of the y-axis, and after being bent vertically, extends along the negative direction of the z-axis to form the third second linear segment 1012. After being bent vertically, the third second linear segment 1012 continues to extend along the positive direction of the y-axis to form the second third linear segment 1013, and so on, to form the aforementioned first linear layer 101a.

[0082] The rightmost end of the first linear layer 101a can be either the first linear segment 1011 or the third linear segment 1013. Taking the first linear segment 1011 as an example, after being vertically bent, the first linear segment 1011 extends to form the second linear segment 1012 used for transition at the edge. After being vertically bent, the second linear segment 1012 used for transition extends along the negative y-axis to form the first third linear segment 1013 of the second linear layer 101b. After being vertically bent, the first third linear segment 1013 of the second linear layer 101b extends along the positive z-axis to form the first second linear segment 1012 of the second linear layer 101b. After being vertically bent, the first second linear segment 1012 of the second linear layer 101b continues to extend along the negative y-axis to form the first first linear segment 1011 of the second linear layer 101b, and so on, to form the aforementioned second linear layer 101b.

[0083] A current loop is formed by winding along the positive direction of the y-axis to the rightmost end and then winding back along the negative direction of the y-axis, and any first wire segment 1011 in the first wire layer 101a is placed between two adjacent first wire segments 1011 in the second wire layer 101b, and any second wire segment 1012 in the first wire layer 101a is placed between two adjacent second wire segments 1012 in the second wire layer 101b, thus forming a compact coil body 101.

[0084] In some embodiments, the coil body 101 is formed by winding a single wire, a portion of which is wound to form a first wire layer 101a, and another portion of which is wound to form a second wire layer 101b. The heights of the first wire segment 1011 in the first wire layer 101a and the first wire segment 1011 in the second wire layer 101b along the second direction may be different or the same, and the heights of the third wire segment 1013 in the first wire layer 101a and the third wire segment 1013 in the second wire layer 101b along the second direction may be different or the same.

[0085] Among them, such as Figure 3b As shown in the figure, t0 refers to the thickness of the magnetic shielding layer 102, and h... u h refers to the distance from the first linear segment 1011 to the upper surface of the magnetic shielding layer 102. l The distance from the third line segment 1013 to the magnetic shielding layer 102 is as follows: Figure 3c As shown, S0 refers to the spacing between adjacent hole structures on the magnetic shielding layer 102, and d h The aperture of the hole structure.

[0086] In some embodiments, the coil body 101 includes a first coil ring 101c and a second coil ring 101d, each of which includes a first coil segment 1011, a second coil segment 1012, and a third coil segment 1013. The first coil ring 101c and the second coil ring 101d are staggered or partially stacked along a first direction, and the first coil ring 101c and the second coil ring are configured such that the directions of the currents allowed to flow through them are opposite.

[0087] Specifically, such as Figure 7 and Figure 8 As shown, taking the first linear loop 101c as an example, the first linear segment 1011 extends along the positive direction of the y-axis, and after a vertical bend, extends along the negative direction of the z-axis to form the second linear segment 1012. The second linear segment 1012 continues to extend along the negative direction of the y-axis after a vertical bend to form the third linear segment 1013. In the illustration, the sides of the first linear segment 1011 and the third linear segment 1013 away from the second linear segment 1012 are closedly connected. This only indicates that the first linear segment 1011 and the third linear segment 1013 are electrically connected on this side to form a current loop, and they can be connected to the positive and negative terminals of an external circuit, respectively.

[0088] In some embodiments, the coil body 101 includes a plurality of first wire loops 101c and a plurality of second wire loops 101d. The plurality of first wire loops 101c are arranged along a first direction, and any two adjacent first wire loops 101c are staggered or partially stacked along the first direction; the plurality of second wire loops 101d are arranged along the first direction, and any two adjacent second wire loops 101d are staggered or partially stacked along the first direction; any two adjacent first wire loops 101c and second wire loops 101d are staggered or partially stacked along the first direction.

[0089] like Figure 7 As shown, any two adjacent first linear loops 101c or any two adjacent second linear loops 101d are staggered or partially stacked along a first direction. If currents of the same direction are passed through a pair of linear loops that are staggered or partially stacked along the first direction, the currents in two adjacent second linear segments 1012 will be in opposite directions, and the magnetic fields generated by the two second linear segments 1012 with opposite currents can cancel each other out. This reduces the computational load of magnetic field calculations and simulations.

[0090] Another objective of this application is to provide a coil array 1000, which includes at least two coil units 10 as described above, and the at least two coil units 10 are arranged in a predetermined manner to form the coil array 1000. In some embodiments, the coil array 1000 includes at least one coil structure 100, and the coil structure 100 includes three coil units 10, which respectively form the three sides of the same triangle to form the coil structure 100.

[0091] In this configuration, each coil unit 10 in the same coil structure 100 is configured to allow the current flowing through it to form a current loop. Each coil unit 10 in the same coil structure 100 may be the same or different. Furthermore, each coil unit 10 in the same coil structure 100 is configured to be excited by a separate amplitude-modulated wave and obtain a driving current, thereby allowing the coil array 1000 to be configured to obtain the optimal magnetic field distribution and magnetic field polarization according to different phases and current directions and to form a three-dimensional rotating magnetic field.

[0092] The coil array 1000 provided in this application embodiment includes a coil structure 100 comprising three coil units 10, which respectively form the three sides of the same triangle to constitute the coil structure 100. Each coil unit 10 in the same coil structure 100 is configured to allow the current flowing through it to form a current loop, and each coil unit 10 is configured to be excited by a separate amplitude-modulated wave and obtain a driving current, thereby allowing the coil array 1000 to be configured to obtain optimal magnetic field distribution and magnetic field polarization according to different phases and current directions, and to form a three-dimensional rotating magnetic field.

[0093] The coil array 1000 provided in this application embodiment can generate a spherical three-dimensional rotating magnetic field by means of precise amplitude modulation technology, which has the following advantages:

[0094] First, the coil array 1000 provided in this application can generate a three-dimensional rotating magnetic field. When the coil array 1000 is used as a transmitting coil in a wireless power transmission system, even if it is a single-axis receiving coil, it can receive the induced voltage transmitted by the transmitting coil at any rotation angle.

[0095] Second, the coil array 1000 provided in this application can be configured as a planar coil, which can generate a three-dimensional rotating magnetic field. Compared with existing three-dimensional coils that generate three-dimensional magnetic fields, this coil significantly reduces the space occupied by the coil as a whole.

[0096] Third, the coil array 1000 provided in this application includes at least one coil structure 100. The at least one coil structure 100 can be combined in different arrays according to different application scenarios to form the coil array 1000, thereby providing a three-dimensional magnetic field corresponding to different application scenarios.

[0097] Fourth, the coil structure 100 in the coil array 1000 provided in this application includes three coil units 10. Compared with the traditional four coils, a three-dimensional rotating magnetic field can be generated by using only a coil structure 100 with three coil units 10, which simplifies the coil structure 100 and reduces the manufacturing cost.

[0098] In some embodiments, the three coil units 10 in the same coil structure 100 are identically configured, and the three coil units 10 respectively form the three sides of the same equilateral triangle.

[0099] In some embodiments, the coil unit 10 is the coil unit 10 provided in the above embodiments, which includes a coil body 101 and a magnetic shielding layer 102. The coil body 101 is configured to allow the current flowing through it to form a current loop. The coil body 101 includes at least a first wire segment 1011, a second wire segment 1012, and a third wire segment 1013 connected in sequence. The first wire segment 1011 and the third wire segment 1013 both extend along a first direction and are spaced apart along a second direction. The second wire segment 1012 extends along the second direction. The first direction and the second direction are intersected.

[0100] The magnetic shielding layer 102 has a thickness dimension along the second direction, and at least a portion of the thickness of the magnetic shielding layer 102 along the second direction is located between the first linear segment 1011 and the third linear segment 1013, and the second linear segment 1012 passes through at least a portion of the thickness of the magnetic shielding layer 102 along the second direction.

[0101] In some embodiments, the magnetic shielding layer 102 includes a first material layer 1021 and a second material layer 1022, which are stacked along a second direction. A third linear segment 1013 is located between the first material layer 1021 and the second material layer 1022. The first linear segment 1011 is located on the side of the first material layer 1021 facing away from the second material layer 1022, and the second linear segment 1012 passes through the first material layer 1021; or, the entire thickness of the magnetic shielding layer 102 along the second direction is located between the first linear segment 1011 and the third linear segment 1013, and the second linear segment 1012 passes through the entire thickness of the magnetic shielding layer 102 along the second direction.

[0102] In some embodiments, the coil array 1000 includes multiple coil structures 100, which may be identical or different, and are arranged in a predetermined array to form the coil array 1000. In a preferred embodiment, the multiple coil structures 100 are identical. For example, the three coil units 10 in the coil structure 100 all employ... Figure 3a The coil unit 10 shown, or the three coil units 10 in the coil structure 100, all adopt the following... Figure 7 The coil unit 10 shown.

[0103] In some embodiments, the coil array 1000 includes an nth layer, an (n-1)th layer, ... a second layer, and a first layer; wherein, the nth layer includes n coil structures 100 arranged in order along a horizontal line, the (n-1)th layer includes n-1 coil structures 100 arranged in order along a horizontal line, ... the second layer includes two coil structures 100 arranged in order along a horizontal line, and the first layer includes one coil structure 100; each coil structure 100 has one upper vertex and two lower vertices.

[0104] The nth level, the (n-1)th level, ... the 2nd level and the 1st level are arranged in a bottom-up order. The two lower vertices of any coil structure 100 in the (n-1)th level coincide with the two upper vertices of two adjacent coil structures 100 in the nth level; and so on. The two lower vertices of the coil structure 100 in the 1st level coincide with the two upper vertices of the two coil structures 100 in the 2nd level.

[0105] In some embodiments, the nth level, the (n-1)th level... the 2nd level and the 1st level form a triangle.

[0106] As an example, such as Figure 2aAs shown, the design of the coil array 1000 varies as n=1, n=2, and n=3, with the order n increasing. Specifically, when n=1, the coil array 1000 includes a coil structure 100, whose three sides have equal lengths; that is, the three coil units 10 extend along the first direction with the same length, and each side is a1.

[0107] In this configuration, when n=2, the coil array 1000 comprises two levels: the second level includes two coil structures 100, and the first level includes one coil structure 100. Furthermore, all three coil structures 100 are identical, with the orientation of each coil structure 100 being the same as that of the coil structure 100 when n=1. In other words, the direction of the current flowing through each side of each coil is the same as the current indication direction of the coil structure 100 when n=1. Within each coil structure 100, the three sides have equal lengths, meaning the extension lengths of the three coil units 10 along the aforementioned first direction are consistent, with each side having a length of a2.

[0108] In this configuration, when n=3, the coil array 1000 comprises three levels: the third level includes three coil structures 100, the second level includes two coil structures 100, and the first level includes one coil structure 100. Furthermore, all six coil structures 100 are identical, and the orientation of each coil structure 100 is the same as that of the coil structure 100 when n=1. That is, the direction of the current flowing through each side of each coil is the same as the current indication direction of the coil structure 100 when n=1. In each coil structure 100, the three sides have equal lengths, meaning the extension lengths of the three coil units 10 along the aforementioned first direction are consistent, with each side having a length of a3.

[0109] In some embodiments, the coil array 1000 includes two nth layers, two (n-1)th layers, ... two nmth layers and nm-1th layers; wherein, the nth layer includes n coil structures 100 arranged in order along a horizontal line, the (n-1)th layer includes n-1 coil structures 100 arranged in order along a horizontal line, ... the nmth layer includes nm coil structures 100 arranged in order along a horizontal line, and the nm-1th layer includes nm-1 coil structures 100 arranged in order along a horizontal line; each coil structure 100 has one upper vertex and two lower vertices.

[0110] Among them, an nth layer, an (n-1)th layer, ... an nmth layer and an nm-1th layer are arranged in a bottom-up direction and form part of the coil array 1000. The two lower vertices of any coil structure 100 in the (n-1)th layer coincide with the two upper vertices of two adjacent coil structures 100 in the nth layer; and so on, the two lower vertices of any coil structure 100 in the nmth layer coincide with the two upper vertices of two adjacent coil structures 100 in the nm-1th layer.

[0111] Furthermore, an nth layer, an (n-1)th layer... an nmth layer and an nm-1th layer constitute a part of the coil array 1000, and another nth layer, another (n-1)th layer... another nmth layer and another nm-1th layer constitute another part of the coil array 1000, with one part and the other part arranged symmetrically at the center.

[0112] In some embodiments, a portion of the coil array 1000 and another portion form a polygon, such as a hexagon.

[0113] As an example, such as Figure 2b The diagram illustrates the design variations of the coil array 1000 as n=2, n=4, and n=6, with n increasing in sequence. When n=2, the upper half of the coil array 1000 comprises one level, containing two coil structures 100. The lower half of the coil array 1000 also comprises one level, containing two coil structures 100. All four coil structures 100 are identical. The upper half, located above the horizontal centerline, forms the aforementioned portion. This portion, after being centrally symmetrically rotated 180°, forms the lower half, the other portion mentioned above. Thus, the upper and lower halves of the coil array 1000 are centrally symmetrically arranged. In each coil structure 100, the three sides have equal lengths; that is, the three coil units 10 extend along the aforementioned first direction with the same length, each side being a2.

[0114] In this configuration, when n=4, the upper half of the coil array 1000 comprises two levels, with the fourth level comprising four coil structures 100 and the third level comprising three coil structures 100. The lower half of the coil array 1000 comprises two levels, with the fourth level comprising four coil structures 100 and the third level comprising three coil structures 100. The upper half, located above the horizontal centerline, forms one of the aforementioned parts. This part, after being centrally symmetrically rotated 180°, forms the lower half, which is the other part mentioned above. Thus, the upper and lower halves of the coil array 1000 are centrally symmetrically arranged. In each coil structure 100, the three sides have equal lengths, meaning the three coil units 10 extend along the first direction with the same length, each side being a4.

[0115] In this configuration, when n=6, the upper half of the coil array 1000 comprises 3 levels: the 6th level comprises 6 coil structures 100, the 5th level comprises 5 coil structures 100, and the 4th level comprises 4 coil structures 100. The lower half of the coil array 1000 also comprises 3 levels: the 6th level comprises 6 coil structures 100, the 5th level comprises 5 coil structures 100, and the 4th level comprises 4 coil structures 100. The upper half, located above the horizontal centerline, forms the aforementioned portion. This portion, after being centrally symmetrical (rotated 180°), forms the lower half, which is the aforementioned other portion. Therefore, the upper and lower halves of the coil array 1000 are centrally symmetrically arranged. In each coil structure 100, the three sides have equal lengths, meaning the three coil units 10 extend along the aforementioned first direction with the same length, each side being a6. Where a2≠a4≠a6.

[0116] It should be noted that the number of layers, current parameters, and specific shape of the coil array 1000 can be changed according to the actual application requirements to match different wireless power design needs.

[0117] The coil unit provided in this application embodiment generates a total magnetic field that includes not only the magnetic field generated by the first coil segment, but also the magnetic fields generated by the second and third coil segments. Figure 3a The magnetic flux density B generated by using point OP as the observation point can be obtained using the Biot-Savad rule:

[0118]

[0119] Where μ0 is the permeability of free space;

[0120] IdL is the line segment dL that carries current I;

[0121] r′ is located at point (x)i ,y i ,z i The line segment dL from the observation point OP(x) OP ,y OP ,z OP The displacement vector of ), where r′=rL;

[0122] When the coil unit is excited by an amplitude-modulated current, the excitation current can be expressed as follows:

[0123] I i (t)=I i cos(ω m t+φ mi cos(ω) o t+φ i )

[0124] Among them, I i It is the amplitude;

[0125] ω m It is the modulation angular frequency, where ω m =2πf m ;

[0126] ω o It is the carrier angular frequency, which is also the operating angular frequency, where ω o =2πf o ;

[0127] φ mi and φ i These are the phase angles of the modulation signal and the carrier signal, respectively.

[0128] The aforementioned excitation current can be further decomposed into a first linear segment and a third linear segment:

[0129]

[0130] Where, ω u and ω l These are the upper and lower corner frequencies, respectively. Wherein:

[0131] ω u =ω o +ω m

[0132] ω l =ω o -ω m

[0133] The phase form corresponding to the excitation current described above can be expressed as:

[0134]

[0135] The phase form corresponding to the above decomposition of the excitation current can be expressed as:

[0136]

[0137] Then, the total magnetic flux density B of the coil structure t (B1, B2, B3) is the sum of the magnetic flux densities produced by the three coil units:

[0138]

[0139] The above calculations are illustrated using a triangular array of coils, specifically demonstrating the calculation when n=2. In the following parameter configuration, h1, h2, and h... v These represent the height position above the first line segment in the coil array, the observation height above the first line segment plus the height distance from the first line segment to the third line segment (that is, the height of the second line segment), and the height difference between the third line segment and the point below the third line segment. Figure 4a The magnetic flux density, considering only the first line segment, is shown to be B. u At the observation height h1 = 0.1m, the total magnetic flux density |B t The distribution of | is shown below. The amplitude and phase angle of the excitation current are as follows:

[0140] B t =B u

[0141]

[0142] in, Figure 4b The magnetic flux density B of the first linear segment is shown when the observation heights h1 = 0.1 m and h2 = 0.06 m. u The magnetic flux density B of the second line segment l Total magnetic flux density |B t The distribution of |.

[0143] in, Figure 5a and Figure 5b The observed heights h1 = 0.1m and h... v Configuration of the coil array at 0.2m. Figure 5c The magnetic flux density B is shown considering only the first line segment. u Total magnetic flux density at time |B t The distribution of | Figure 5d The magnetic flux density B is shown considering only the second body segment. v Total magnetic flux density at time |B t The distribution of |.

[0144] in, Figure 6a and Figure 6b The observed heights h1 = 0.1m and h... v Configuration of the coil array when h1 = 0.4m and h2 = 0.06m. Figure 6c The magnetic flux density B is shown considering only the first line segment. u The magnetic flux density B of the second linear segment v Side coil B s Total magnetic flux density at time |B t The distribution of | Figure 6d The magnetic flux density B is shown considering only the second body segment. v Total magnetic flux density at time |B t The distribution of |. Where:

[0145] B t =B u +B l +B v +B s

[0146] from Figures 4a to 6d It can be seen that the total magnetic field distribution is very sensitive to the actual winding structure, and the return coil with the opposite current direction will greatly reduce the magnetic field strength. In order to effectively mitigate the influence of the return coil and accurately simulate the effects of the vertical coil, the side coil and the return coil, the above-mentioned magnetic shielding layer was designed.

[0147] like Figure 7 and Figure 8 As shown, Figure 8 The actual windings in the circuit can be equivalent to Figure 7 The calculation is greatly simplified because the magnetic fields generated by two adjacent lines with opposite currents can cancel each other out.

[0148] like Figure 9 As shown, part (a) is the actual winding of the coil, and part (b) is the equivalent winding of part (a). Figure 10 As shown, parts (b) and (c) respectively show Figure 9 The simulation results for both (a) and (b) winding technologies are consistent with the theoretical results. Specifically, when the phase angle (φ) mi ,φ i When the current direction (vecA, vecB, vecC) is as shown in the table below:

[0149]

[0150] Figure 11a and Figure 11bThe magnetic field trajectories and distributions of two different coil configurations at different observation points are shown, after the application of a magnetic shielding layer. The magnetic field trajectory is represented by the generated magnetic flux density vector B. t The trajectory of the rotating magnetic field helps to visually display the polarization and strength of the magnetic field. The direction of the magnetic field generated by this rotating field changes over time, allowing a single-axis receiving coil to capture magnetic flux from all directions. Furthermore, spherical polarization ensures uniform power transfer because the magnetic field strength is omnidirectional. Figure 11a and Figure 11b As shown, the entire coil region can obtain the polarization of a spherical magnetic field.

[0151] Among them, Figure 11a In the middle, the phase angle (φ) mi ,φ i The directions of current (vecA, vecB, vecC) are shown below:

[0152]

[0153] exist Figure 11b In the middle, the phase angle (φ) mi ,φ i The directions of current (vecA, vecB, vecC) are shown below:

[0154]

[0155] Among them, such as Figure 1 As shown, four coils can generate a three-dimensional rotating magnetic field, and the polarization of the magnetic field generated by the four coils is as follows. Figure 1 As shown. Figure 2a and Figure 2b As shown, the coil structure provided in this application embodiment requires only 3 coil units to produce the same magnetic field polarization.

[0156] Another objective of this application is to provide a wireless power transmission system, which includes the coil array described above.

[0157] The advantages of the wireless power transmission system provided in this application compared to the prior art are the same as the advantages of the coil array provided in this application compared to the prior art, and will not be repeated here.

[0158] The advantages of the coil array provided in this application compared to the prior art are the same as the advantages of the coil unit provided in this application compared to the prior art, and will not be repeated here.

[0159] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A coil unit (10), characterized in that: It includes a coil body (101) and a magnetic shielding layer (102); The coil body (101) is configured to allow the current flowing through it to form a current loop. The coil body (101) includes at least a first wire segment (1011), a second wire segment (1012), and a third wire segment (1013) connected in sequence. The first wire segment (1011) and the third wire segment (1013) both extend along a first direction and are spaced apart along a second direction. The second wire segment (1012) extends along the second direction. The first direction and the second direction are intersected. The magnetic shielding layer (102) has a thickness dimension along the second direction, and at least a portion of the thickness of the magnetic shielding layer (102) along the second direction is located between the first line segment (1011) and the third line segment (1013), and the second line segment (1012) passes through at least a portion of the thickness of the magnetic shielding layer (102) along the second direction.

2. The coil unit (10) as described in claim 1, characterized in that: The first line segment (1011) and the third line segment (1013) are arranged in parallel, the first direction and the second direction are perpendicular to each other, and the plane where the coil body (101) is located is perpendicular to the plane where the magnetic shielding layer (102) is located.

3. The coil unit (10) as described in claim 1, characterized in that: The magnetic shielding layer (102) includes a first material layer (1021) and a second material layer, wherein the first material layer (1021) and the second material layer are stacked along the second direction; Furthermore, the third line segment (1013) is located between the first material layer (1021) and the second material layer, the first line segment (1011) is located on the side of the first material layer (1021) away from the second material layer, and the second line segment (1012) passes through the first material layer (1021).

4. The coil unit (10) as described in claim 1, characterized in that: The magnetic shielding layer (102) includes a first material layer (1021) and a second material layer (1022), which are stacked along the second direction; wherein, the first material layer (1021) is configured to achieve shielding by absorbing the magnetic field to be shielded, and the second material layer (1022) is configured to achieve shielding by reflecting the magnetic field to be shielded; Furthermore, the entire thickness of the magnetic shielding layer (102) along the second direction lies between the first linear segment (1011) and the third linear segment (1013), and the second linear segment (1012) passes through the entire thickness of the magnetic shielding layer (102) along the second direction.

5. The coil unit (10) as described in any one of claims 1-4, characterized in that: The coil body (101) includes a plurality of first wire segments (1011), a plurality of second wire segments (1012), and a plurality of third wire segments (1013); Multiple first line segments (1011) are arranged in sequence along the first direction, multiple third line segments (1013) are arranged in sequence along the first direction, multiple first line segments (1011) and multiple third line segments (1013) are arranged alternately along the first direction, and any adjacent first line segments (1011) and third line segments (1013) are connected by a second line segment (1012).

6. The coil unit (10) as described in claim 5, characterized in that: The coil body (101) includes a first wire layer (101a) and a second wire layer (101b) stacked together, and each wire layer includes a plurality of first wire segments (1011), a plurality of second wire segments (1012) and a plurality of third wire segments (1013); Furthermore, any one of the first wire segments (1011) in the first wire layer (101a) is disposed between two adjacent first wire segments (1011) in the second wire layer (101b), and any one of the second wire segments (1012) in the first wire layer (101a) is disposed between two adjacent second wire segments (1012) in the second wire layer (101b). The plurality of second wire segments (1012) in the first wire layer (101a) and the plurality of second wire segments (1012) in the second wire layer (101b) are stacked one-to-one; wherein the first wire layer (101a) and the second wire layer (101b) are configured such that the directions of the currents allowed to flow through them are opposite.

7. The coil unit (10) as described in claim 6, characterized in that: The coil body (101) is formed by winding a single wire, a portion of which is wound to form the first wire layer (101a), and another portion of which is wound to form the second wire layer (101b).

8. The coil unit (10) as described in any one of claims 1-4, characterized in that: The coil body (101) includes a first wire loop (101c) and a second wire loop (101d), and the first wire loop (101c) and the second wire loop (101d) each include a first wire segment (1011), a second wire segment (1012) and a third wire segment (1013); The first wire ring (101c) and the second wire ring (101d) are staggered or partially stacked along the first direction, and the first wire ring (101c) and the second wire ring are configured such that the directions of the current allowed to flow through them are opposite.

9. The coil unit (10) as claimed in claim 1, characterized in that: The coil body (101) includes a plurality of first wire loops (101c) and a plurality of second wire loops (101d); Multiple first linear loops (101c) are arranged along a first direction, and any two adjacent first linear loops (101c) are staggered or partially stacked along the first direction; multiple second linear loops (101d) are arranged along a first direction, and any two adjacent second linear loops (101d) are staggered or partially stacked along the first direction; any adjacent first linear loops (101c) and second linear loops (101d) are staggered or partially stacked along the first direction.

10. A coil array (1000), characterized in that: The coil array (1000) includes coil units (10) as claimed in any one of claims 1-9.

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