Wireless charging system magnetic coupling mechanism capable of generating uniform magnetic field in space and parameter optimization method thereof

Abstract

The invention belongs to the field of wireless power transmission, and discloses a wireless power transmission system coupling mechanism capable of generating a uniform magnetic field in space, the coupling mechanism comprises a transmitting coil and a receiving coil, and the transmitting coil comprises a stepped transmitting coil and a combined anti-series coil; the step-shaped transmitting coil is composed of a plurality of step-shaped transmitting coil units; the rectangular stepped coil unit comprises n sections of transverse platforms and m sections of vertical platforms, wherein n is equal to 2m + 1; the combined anti-series coil is formed by connecting at least one group of first coil units in series; the first coil unit of the combined type reverse series coil is of a polygonal structure, and the number of edges of the first coil unit is the same as the number of the step-shaped transmitting coil units. By means of the design that the combined type anti-series coil is arranged in the step-shaped transmitting coil and the magnetic field superposition principle, the step-shaped transmitting coil and the combined type anti-series coil are combined, and the part, with the weak magnetic field, in the middle of the step-shaped coil can be made up.

Description

Technical Field

[0001] The present invention belongs to the technical field related to wireless power transmission, and more specifically, relates to a coupling mechanism of a wireless power transmission system for generating a uniform magnetic field in space and a parameter optimization method thereof. Background Art

[0002] With the development of the economy, the exploration of the ocean and the utilization of marine resources have become popular research directions in recent years. Underwater vehicles are the core equipment for exploring the ocean and developing marine resources. At present, underwater vehicles of various shapes have been developed to adapt to different working environments. However, energy issues have always been the main factor restricting underwater vehicles from working continuously in the ocean for a long time. Wireless power transmission technology, as a new type of power transmission method, breaks the inherent mode of traditional wired power transmission and completely isolates the electronic devices at the sending and receiving ends. Especially in underwater application scenarios, it has great development potential.

[0003] The electromagnetic coupling mechanism is the core component of the wireless power transmission system, which plays an important role in the system output power and transmission efficiency. The coupling mechanism needs to be designed to match the shape and structure of the underwater vehicle, and to ensure the stability of the coupling mechanism parameters when the coupling mechanism is offset. This requires the transmitting coil of the coupler to generate a uniform magnetic field in space to ensure that the receiving coil can stably receive energy at all positions in space.

[0004] There are microorganisms such as microorganisms and algae in the marine environment that are easily adsorbed on the surface of objects. Due to long-term underwater work, marine microorganisms will gather on the shell of underwater vehicles, causing the underwater vehicles to deviate in various directions such as lateral, height, and rotation angle during wireless charging. Due to the presence of marine microorganisms, the transmission distance of the coupling mechanism increases and the system transmission efficiency is greatly reduced. Therefore, it is urgent to design a coupler that can generate a uniform magnetic field in space to ensure that the coupling mechanism can resist deviations in all directions, thereby stabilizing and efficiently transmitting efficiency.

[0005] At present, there are some electromagnetic coupling mechanisms that can generate uniform magnetic fields, but most of them are designed for underwater vehicles with rotating structures. Their characteristics are that they can generate uniform magnetic fields in specific directions in space, and the range of the generated uniform magnetic fields is limited. They can only have a certain anti-deviation ability in specific directions, and cannot meet the use environment of underwater planar underwater vehicles. This has limited the development of underwater wireless charging.

[0006] In view of the lateral, height, rotation angle and other displacements of the planar underwater vehicle underwater, it is necessary to design an underwater wireless power transmission system coupling mechanism with uniform magnetic field characteristics, which can generate a uniform magnetic field in a large range in space to ensure that the coupling mechanism can operate efficiently and stably. The solution should also optimize the specific parameters in the coupling mechanism to achieve the best uniform effect. Summary of the invention

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a coupling mechanism of a wireless power transmission system that generates a uniform magnetic field in space and a parameter optimization method thereof, wherein the transmitting coil of the coupling mechanism is composed of a stepped transmitting coil and a combined anti-series coil, and the stepped transmitting coil and the combined coil are connected in reverse series; the combination of the stepped transmitting coil and the combined anti-series coil makes the magnetic fields generated by the two complement each other, thereby solving the technical problem that the coupling mechanism of the wireless power transmission system generates a uniform magnetic field over a large range in space, and based on the coupling mechanism of the wireless power transmission system that generates a uniform magnetic field in space provided by the present invention, a method for optimizing the structural parameters of the transmitting coil of the coupling mechanism is provided, so that the coupling mechanism can realize a uniform magnetic field over a large range in space, thereby achieving the ability to resist omnidirectional position deviation in various directions such as lateral, vertical, and tilt.

[0008] To achieve the above object, according to one aspect of the present invention, a coupling mechanism of a wireless power transmission system for generating a uniform magnetic field in space is provided, wherein the coupling mechanism comprises a transmitting coil and a receiving coil;

[0009] It should be noted that the transmitting coil and the receiving coil are independent mechanisms, and during use, the transmitting coil and the receiving coil are used in conjunction to achieve the purpose of energy transmission;

[0010] Furthermore, the transmitting coil comprises a stepped transmitting coil and a combined anti-series coil;

[0011] Wherein, the step-shaped transmitting coil is composed of a plurality of step-shaped transmitting coil units;

[0012] The step-shaped transmitting coil unit is in a rectangular step-shaped shape, including a horizontal platform and a vertical platform;

[0013] Furthermore, the rectangular stepped coil unit comprises n horizontal platforms and m vertical platforms, wherein n=2m+1, and the value of m is a positive integer greater than 0;

[0014] Furthermore, the rectangular stepped vertical platforms are of equal height;

[0015] Furthermore, the rectangular stepped lower horizontal platform is connected end to end with the upper horizontal platform via a vertical platform;

[0016] It should be noted that the rectangular stepped next transverse platform of the present invention is connected end to end with the previous transverse platform through the vertical platform, so that the rectangular stepped structure is a symmetrical stepped shape, and the upper and lower transverse platforms used here are relative positional relationships, and do not refer to the specific number of platforms;

[0017] In some embodiments, the stepped transmitting coil is composed of at least four stepped transmitting coil units;

[0018] The at least four stepped transmitting coil units form a closed stepped transmitting coil, so that the stepped transmitting coil forms a closed loop;

[0019] Furthermore, the number of turns of the stepped transmitting coil is N1;

[0020] In some other embodiments, the combined anti-series coil is composed of multiple groups of first coil units connected in series, and each group of coil units is connected in reverse series, that is, the currents in two adjacent coil units flow in opposite directions;

[0021] It should be noted that the first coil units are located on the same plane, and the sizes of the first coil units are not necessarily equal. For example, the two first coil units may be of different sizes and can form a centrally symmetrical structural arrangement.

[0022] The first coil unit of the combined anti-series coil is a polygonal structure, and the number of sides of the first coil unit is the same as the number of the stepped transmitting coil unit;

[0023] Furthermore, the combined anti-series coil is in a closed loop space formed by the stepped transmitting coil;

[0024] Furthermore, the combined anti-series coil is aligned with the center of the stepped transmitting coil;

[0025] Preferably, the stepped transmitting coil is composed of four stepped transmitting coil units;

[0026] The first coil unit of the combined anti-series coil is a quadrilateral structure;

[0027] Preferably, the first coil unit of the combined anti-series coil is a square structure;

[0028] More preferably, the combined anti-series coil is composed of three groups of square structure coils;

[0029] The stepped transmitting coil provided by the present invention comprises a stepped transmitting coil unit, and when the vertical platform height of the stepped transmitting coil unit is increased by a small distance, a uniform magnetic field region of a larger range can be generated along the vertical platform direction.

[0030] Furthermore, the magnetic fields generated by the step-shaped transmitting coil at the adjacent chain wires of the two step-shaped transmitting coil units are superimposed at the locations, and the magnetic field strength generated at the adjacent chain wires will be much stronger than the magnetic field in the middle area (enclosed area);

[0031] Furthermore, the combined anti-series coil can generate a magnetic field with a strong middle area and a weak peripheral area;

[0032] The present invention is based on the design of the transmitting coil structure, and can make up for the weaker magnetic field in the middle of the stepped coil by combining the stepped transmitting coil with the combined anti-series coil.

[0033] According to another aspect of the present invention, there is provided a method for designing a coupling mechanism of a wireless power transmission system for generating a uniform magnetic field in space, comprising the following steps:

[0034] S1: Adjust the n-segment horizontal platform and the m-segment vertical platform of the step-shaped transmitting coil unit and the number of turns N1 of the step-shaped transmitting coil, calculate the magnetic field strength of the step-shaped transmitting coil according to the formula, optimize the n-segment horizontal platform and the m-segment vertical platform and the number of turns N1, so that the minimum value of the magnetic field Bz at the height direction z of the step-shaped transmitting coil is greater than 50% of the maximum value of Bz;

[0035] S2: Based on the optimized n-segment horizontal platform and m-segment vertical platform and the number of turns N1, at least one first coil unit of the anti-series coil is set, the magnetic field strength of the stepped transmitting coil is calculated according to the formula, and the number of first coil units is adjusted so that the minimum value of the magnetic field Bz in the height direction z of the stepped transmitting coil is greater than 95% of the maximum value of Bz.

[0036] Preferably, the present invention further provides a coupling mechanism for a wireless power transmission system that generates a uniform magnetic field in space, wherein the coupling mechanism comprises a transmitting coil and a receiving coil;

[0037] The transmitting coil comprises a stepped transmitting coil and a combined anti-series coil;

[0038] Among them, the stepped transmitting coil is composed of four stepped transmitting coil units; the combined anti-series coil is composed of three groups of square structure first coil units; the combined anti-series coil is in the closed loop space formed by the stepped transmitting coil; and the combined anti-series coil is aligned with the center of the stepped transmitting coil.

[0039] The rectangular stepped coil unit comprises n horizontal platforms and m vertical platforms, wherein n=2m+1, and the value of m is a positive integer greater than 0; the number of turns of the stepped transmitting coil is N1;

[0040] Furthermore, as a preferred embodiment, the present invention provides a method for designing a coupling mechanism of a wireless power transmission system that generates a uniform magnetic field in space, comprising the following steps:

[0041] S1: Adjust the n-segment horizontal platform and the m-segment vertical platform of the step-shaped transmitting coil unit and the number of turns N1 of the step-shaped transmitting coil, calculate the magnetic field strength of the step-shaped transmitting coil according to the formula, optimize the n-segment horizontal platform and the m-segment vertical platform and the number of turns N1, so that the minimum value of the magnetic field Bz at the height direction z of the step-shaped transmitting coil is greater than 50% of the maximum value of Bz;

[0042] S2: Based on the optimized n-segment horizontal platform and m-segment vertical platform and the number of turns N1, the first coil unit turn of the anti-series coil is used to evenly distribute the magnetic field. The magnetic field strength of the stepped transmitting coil is calculated according to the formula, so that the minimum value of the magnetic field Bz at the height direction z of the stepped transmitting coil is greater than 65% of the maximum value of Bz;

[0043] S3: Based on the first coil unit turn of the anti-series coil in step S2 being used to uniformly distribute the magnetic field, a second coil unit turn of the anti-series coil is further set to uniformly distribute the magnetic field, and the magnetic field strength of the step-shaped transmitting coil is calculated according to a formula, so that the minimum value of the magnetic field Bz at the height direction z of the step-shaped transmitting coil is greater than 80% of the maximum value of Bz;

[0044] S4: Based on the first and second first coil unit turns of the anti-series coil in step S3 for uniform magnetic field distribution, the third first coil unit turn of the anti-series coil is further set to uniform magnetic field distribution, and the magnetic field strength of the stepped transmitting coil is calculated according to the formula, so that the minimum value of the magnetic field Bz in the height direction z of the stepped transmitting coil is greater than 95% of the maximum value of Bz.

[0045] Compared with the prior art, the above technical solution conceived by the present invention has the following advantages:

[0046] Beneficial effects:

[0047] The present invention forms a transmitting coil of a coupler by combining a step-shaped transmitting coil with an anti-series coil, so that the transmitting coil of the coupling mechanism is generated in a larger spatial range. The magnetic field generated by the step-shaped transmitting coil at the adjacent chain wires of the two step-shaped transmitting coil units is superimposed there, and the magnetic field intensity generated at the adjacent chain wires will be much stronger than the magnetic field in the middle area (enclosed area); and the combined anti-series coil can generate a magnetic field with a strong middle area (enclosed area) and a weak peripheral area; the design of arranging the combined anti-series coil inside the step-shaped transmitting coil, using the principle of magnetic field superposition, the step-shaped transmitting coil is combined with the combined anti-series coil, which can make up for the weaker part of the magnetic field in the middle of the step-shaped coil.

[0048] In addition, the stepped transmitting coil unit of the transmitting coil provided by the present invention is raised to a relatively small height, so that the magnetic field strength of the transmitting end coil in the height direction of the stepped transmitting coil is greatly improved. At the same time, it is combined with the anti-series coil inside the transmitting coil to optimize the specific parameters of the stepped transmitting coil and the anti-series coil, so that the coupling mechanism can realize a uniform magnetic field in a relatively large spatial range, thereby achieving the ability to resist omnidirectional position deviation in various directions such as lateral, vertical, and tilt. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The present application will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be taken as limiting the scope of the present application.

[0050] Figure 1 is a detailed schematic diagram of a stepped coil according to an example of the present invention;

[0051] Figure 2 1 is a magnetic field distribution diagram of the step-shaped coil unit of the present invention when the number of vertical platforms is different, wherein in Figure (a) m=1, in Figure (b) m=2, in Figure (c) m=3, and in Figure (d) m=4;

[0052] Figure 3 (a) is a top view and (b) is a cross-sectional view of a stepped coil transmitting coil structure of an example of the present invention;

[0053] Figure 4 is a flow chart of coupling mechanism parameter optimization according to an example of the present invention;

[0054] Figure 5 is a schematic diagram of a coupling mechanism according to an example of the present invention under different offset conditions;

[0055] Figure 6The mutual inductance distribution diagram of the coupling mechanism of the present invention at different transmission distances is (a) H = 20 mm, (b) H = 30 mm, (c) H = 40 mm, (d) H = 50 mm, (e) H = 60 mm, (f) H = 70 mm);

[0056] Figure 7 The mutual inductance distribution diagrams of the coupling mechanism of the present invention at different rotation angles are (a) θ = 5°, (b) θ = 10°, (c) θ = 15°, and (d) θ = 20°. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] Figure 1 It is a detailed schematic diagram of the stepped transmitting coil. In this embodiment, the transmitting coil includes a stepped transmitting coil and a combined anti-series coil; the stepped transmitting coil is composed of four stepped transmitting coil units; the combined anti-series coil is composed of three groups of square structure first coil units; the combined anti-series coil is in the closed loop space formed by the stepped transmitting coil; and the combined anti-series coil is aligned with the center of the stepped transmitting coil. The rectangular stepped coil unit includes n horizontal platforms and m vertical platforms, where n=2m+1, and the value of m is a positive integer greater than 0; the scheme in which the number of turns of the stepped transmitting coil is N1 is discussed, and the relevant coordinates have been marked in the figure. The coordinate axis is at the center of the stepped transmitting coil, P is an arbitrary point in space, and the magnetic field strength at point P is the vector superposition generated by each coil in the stepped transmitting coil.

[0059] According to the Biot-Savart law, the magnetic field strength generated by the current element at point P is:

[0060]

[0061] Where μ0 is the magnetic permeability in vacuum, I is the current flowing through the conductor, r is the distance from point P to the conductor segment, is the corresponding vector, and the magnetic induction intensity generated by the wire segment at point P is the accumulation of the induced magnetic field generated by the current element.

[0062] exist Figure 1In the figure, S is a charging plane. At H above the stepped transmitting coil, the rectangular stepped transmitting coil includes four stepped transmitting coil units, and the sides of the four stepped transmitting coil units are equal. The four stepped transmitting coil units are connected into a closed structure, presenting an axisymmetric structure.

[0063] Therefore, the following analysis is only conducted on one of the stepped transmitting coil units. The stepped transmitting coil unit includes n transverse platforms with a length of l 11 , contains m vertical platforms in the vertical direction;

[0064] Where n=2m+1, and the value of m is a positive integer greater than 0;

[0065] The height of the vertical platform is set to hmm, and the length of the horizontal platform is set to l 11 mm; the magnetic field distribution above the transmitting coil is affected by the structure of the stepped transmitting coil unit, and the vertical platforms of the rectangular stepped transmitting coil unit provided by the present invention are of equal height; and the next horizontal platform of the rectangular step is connected end to end with the previous horizontal platform through the vertical platform (or platform); the number of turns of the rectangular stepped coil is N1.

[0066] like Figure 1 As shown, the rectangular stepped transmitting coil unit of the stepped transmitting coil has horizontal wire segments AB, CD, EF ... NQ ... RS, TU. The magnetic induction intensity generated at point P can be calculated by formula (2).

[0067]

[0068] The magnetic induction intensity at point P can be decomposed into a horizontal component parallel to the charging plane and a vertical component perpendicular to the charging plane. In the proposed rectangular stepped coil, the vertical component of the magnetic induction intensity is the main factor affecting the power transmission efficiency.

[0069] The angles between the charge plane S and the charge plane S are α1, α2…α n-1 ,α n ,

[0070]

[0071] Therefore, the vertical magnetic field component generated by the horizontal wire segment at point P is:

[0072]

[0073] The magnetic field strength at point P also includes the vertical component of the vertical conductor segments BC, DE, HJ…KL…QR, ST, which can be calculated by (5)

[0074]

[0075] The angles between the charge plane S and the charge plane S are β1, β2…β n-1 ,β n ,

[0076]

[0077] Therefore, the vertical magnetic field component generated by the vertical wire segment at point P is:

[0078]

[0079] The magnetic field intensity at point P is the sum of the magnetic induction intensity generated by the horizontal line segment and the magnetic induction intensity generated by the vertical line segment, which can be calculated by (8):

[0080]

[0081] The magnetic field distribution of different vertical platforms at the same height can be calculated by formulas (4), (7) and (8), as follows: Figure 2 As shown, with the increase of the number of vertical platforms, the magnetic field strength above the stepped transmitting coil is greatly improved, the peak value of the magnetic field strength around it is gradually decreasing, and the magnetic field strength in the middle concave area is increasing, so the stepped transmitting coil has good anti-offset performance.

[0082] However, due to the limitation of actual size, the number of steps cannot be increased continuously. As shown in Figure (2)(d), there is still a part of the magnetic field concave area in the middle of the step-shaped coil. Therefore, it is necessary to connect the rectangular coil in reverse series inside the step-shaped transmitting coil to even out the magnetic field generated by the step-shaped transmitting coil. The overall structure is shown in Figure (3). The combined reverse series coil is composed of three square first coil units in series. The center of the reverse series coil inside the step-shaped transmitting coil is aligned with the center of the step-shaped coil. The number of turns of the first group of first coil units in the reverse series coil is N2, the number of turns of the second group of first coil units is N3, and the number of turns of the second group of first coil units is N4. The distances between the reverse series coils are amm, bmm, and cmm respectively.

[0083] Based on finite element analysis, parameters m, h, N1, N2, N3, and N4 need to be optimized in sequence. The optimization flow chart is as follows: Figure 4 As shown, the basic idea of ​​optimization is as follows:

[0084] Step 1: First, optimize the parameters m, h, and N1. In order to obtain a uniform magnetic field, the first evaluation criterion is set to B. z Is the minimum value of greater than B? z 50% of maximum value.

[0085] Step 2: Then, the anti-series coil group 1 is used to evenly connect B zThe magnetic field distribution, the second evaluation criterion is B z Is the minimum value of greater than B? z 65% of maximum value.

[0086] Step 3: Next, the anti-series coil group 2 is used to further even out B z The magnetic field distribution of the third evaluation criterion is B z Is the minimum value of greater than B? z 80% of maximum value.

[0087] Step 4, the last anti-series coil group 3 is used to finally evenly connect B z The magnetic field distribution of the third evaluation criterion is B z Is the minimum value of greater than B? z 95% of the maximum value.

[0088] The optimization results are shown in Table 1:

[0089]

[0090] The coupling mechanism offset is as follows Figure 5 As shown, the x-direction offset is Δx, the y-direction offset is Δy, the height offset is Δh, and the angle offset is, where:

[0091]

[0092] Figure 6 The mutual inductance distribution diagram of the coupling mechanism at different transmission distances, where (a) H = 20mm, (b) H = 30mm, (c) H = 40mm, (d) H = 50mm, (e) H = 60mm, (f) H = 70mm. When the maximum offset is 40%, the mutual inductance fluctuates at 20.2%, which is acceptable considering the extreme offset. The maximum mutual inductance increases from 45.35μH to 49.1μH and then decreases to 36.8μH.

[0093] Figure 7 The figure shows the mutual inductance distribution of the coupling mechanism at different rotation angles. It can be seen from the figure that the maximum mutual inductance does not fluctuate much. During the rotation, half of the receiving coil will be close to the stepped transmitting coil, and the other half will be far away from the transmitting coil. Therefore, the mutual inductance of the two receiving coils complement each other and finally achieve uniform distribution. In the case of maximum offset, the mutual inductance changes within 32.1%.

[0094] In summary, the combined stepped coil and anti-series coil proposed in the present invention as the transmitting coil of the coupling mechanism can effectively and significantly increase the uniform magnetic field area in the spatial region, thereby achieving the anti-deviating performance of the receiving coil in various directions such as lateral, vertical, and inclined, and optimizing the specific parameters of the transmitting coil to better achieve a uniform magnetic field.

[0095] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coupling mechanism for a wireless power transmission system that generates a uniform magnetic field in space, the coupling mechanism comprising a transmitting coil and a receiving coil, characterized in that: The transmitting coil comprises a stepped transmitting coil and a combined anti-series coil; Wherein, the step-shaped transmitting coil is composed of a plurality of step-shaped transmitting coil units; The step-shaped transmitting coil unit is in a rectangular step-shaped shape, including a horizontal platform and a vertical platform; The step-shaped transmitting coil unit comprises n horizontal platforms and m vertical platforms, wherein n=2m+1, and the value of m is a positive integer greater than 0; The step-shaped transmitting coil unit constitutes a closed step-shaped transmitting coil, so that the step-shaped transmitting coil forms a closed loop.

2. A wireless power transmission system coupling mechanism for generating a uniform magnetic field in space as claimed in claim 1, characterized in that: The rectangular stepped vertical platforms are of equal height; The rectangular stepped lower horizontal platform is connected end to end with the upper horizontal platform via a vertical platform.

3. A wireless power transmission system coupling mechanism for generating a uniform magnetic field in space as claimed in claim 2, characterized in that: The step-shaped transmitting coil is composed of at least four step-shaped transmitting coil units; The at least four stepped transmitting coil units form a closed stepped transmitting coil, so that the stepped transmitting coil forms a closed loop.

4. A wireless power transmission system coupling mechanism for generating a uniform magnetic field in space as claimed in any one of claims 1 to 3, characterized in that: The combined anti-series coil is composed of at least one group of first coil units connected in anti-series, so that the currents in two adjacent coil units flow in opposite directions; The first coil unit of the combined anti-series coil is a polygonal structure, and the number of sides of the first coil unit is the same as the number of the stepped transmitting coil units.

5. A wireless power transmission system coupling mechanism for generating a uniform magnetic field in space as claimed in claim 4, characterized in that: The combined anti-series coil is in a closed loop space formed by the stepped transmitting coil; The combined anti-series coil is aligned with the center of the stepped transmitting coil.

6. A wireless power transmission system coupling mechanism for generating a uniform magnetic field in space as claimed in claim 5, characterized in that: The step-shaped transmitting coil is composed of four step-shaped transmitting coil units; The first coil unit of the combined anti-series coil is a quadrilateral structure; The coupling mechanism of the wireless power transmission system is composed of a stepped transmitting coil and a combined coil connected in reverse series.

7. A wireless power transmission system coupling mechanism for generating a uniform magnetic field in space as claimed in claim 6, characterized in that: The combined anti-series coil is composed of three groups of square structure coils.

8. A method for optimizing a coupling mechanism of a wireless power transmission system that generates a uniform magnetic field in space, applied to the coupling mechanism according to any one of claims 1 to 7, comprising the following steps: S1: Adjust the n-segment horizontal platform and the m-segment vertical platform of the step-shaped transmitting coil unit and the number of turns N1 of the step-shaped transmitting coil, calculate the magnetic field strength of the step-shaped transmitting coil according to the formula, optimize the n-segment horizontal platform and the m-segment vertical platform and the number of turns N1, so that the minimum value of the magnetic field Bz at the height direction z of the step-shaped transmitting coil is greater than 50% of the maximum value of Bz; S2: Based on the optimized n-segment horizontal platform and m-segment vertical platform and the number of turns N1, at least one first coil unit of the anti-series coil is set, the magnetic field strength of the stepped transmitting coil is calculated according to the formula, and the number of first coil units is adjusted so that the minimum value of the magnetic field Bz in the height direction z of the stepped transmitting coil is greater than 95% of the maximum value of Bz.

9. A method for designing a coupling mechanism of a wireless power transmission system that generates a uniform magnetic field in space, applied to the coupling mechanism of claim 7, comprising the following steps: S1: Adjust the n-segment horizontal platform and the m-segment vertical platform of the step-shaped transmitting coil unit and the number of turns N1 of the step-shaped transmitting coil, calculate the magnetic field strength of the step-shaped transmitting coil according to the formula, optimize the n-segment horizontal platform and the m-segment vertical platform and the number of turns N1, so that the minimum value of the magnetic field Bz at the height direction z of the step-shaped transmitting coil is greater than 50% of the maximum value of Bz; S2: Based on the optimized n-segment horizontal platform and m-segment vertical platform and the number of turns N1, the first coil unit turn of the anti-series coil is used to evenly distribute the magnetic field. The magnetic field strength of the stepped transmitting coil is calculated according to the formula, so that the minimum value of the magnetic field Bz at the height direction z of the stepped transmitting coil is greater than 65% of the maximum value of Bz; S3: Based on the first coil unit turn of the anti-series coil in step S2 being used to uniformly distribute the magnetic field, a second coil unit turn of the anti-series coil is further set to uniformly distribute the magnetic field, and the magnetic field strength of the step-shaped transmitting coil is calculated according to a formula, so that the minimum value of the magnetic field Bz at the height direction z of the step-shaped transmitting coil is greater than 80% of the maximum value of Bz; S4: Based on the first and second first coil unit turns of the anti-series coil in step S3 for uniform magnetic field distribution, the third first coil unit turn of the anti-series coil is further set to uniform magnetic field distribution, and the magnetic field strength of the stepped transmitting coil is calculated according to the formula, so that the minimum value of the magnetic field Bz in the height direction z of the stepped transmitting coil is greater than 95% of the maximum value of Bz.

Images