Bipolar arched magnetic coupling structure for underwater wireless energy transmission and its application

Abstract

The present invention belongs to the technical field of underwater wireless charging, and specifically relates to a bipolar arched magnetic coupling structure for underwater wireless energy transmission and its application. The transmitting structure (21) comprises a transmitting magnetic core (211) and a bipolar transmitting coil located on the transmitting magnetic core (211); the pickup structure (12) comprises an arched pickup magnetic core (121) and a pickup coil (122) wound on the pickup magnetic core (121); the anti-axial misalignment structure (13) is arranged on the pickup magnetic core (121); the pickup magnetic core (121) is located outside the anti-rotational misalignment structure (14). Compared with the prior art, the present invention has the following beneficial effects: the magnetic coupling structure utilizes electromagnetic induction to realize the transmission of electric energy from the bipolar transmitting coil to the pickup coil, has high reliability, simple structure, light weight, high tolerance to rotational and axial misalignment, and can realize stable and efficient wireless power transmission underwater.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater wireless charging, and in particular relates to a bipolar arched magnetic coupling structure for underwater wireless energy transmission and an application thereof. Background Art

[0002] In order to better develop and protect marine resources, various advanced technologies are constantly emerging, among which autonomous underwater vehicles (AUVs) are increasingly being used, and are widely used in the fields of marine scientific research, resource exploration, military use, and environmental testing. However, due to the limitation of lithium battery capacity, AUVs generally have insufficient endurance and small working range in long-term missions. Therefore, extending the working time of AUVs through existing technical means has become a technical problem that needs to be solved urgently. Traditional wired charging methods rely on electrical connections, and AUVs must be recycled for power supply. This method is complex and labor-intensive. In recent years, more and more devices have begun to use wireless charging for power transmission. Since there is no electrical connection, this method brings many conveniences to powering devices in special scenarios. For AUVs, the application of wireless charging can greatly improve the automation of AUV charging, extend the cruising time of AUVs, and expand the range of AUV activities. Wireless charging technology has become one of the key technologies to improve the endurance of AUVs.

[0003] The use of wireless charging to power AUVs places higher demands on the magnetic coupling structure of the wireless charging system. In recent years, in order to achieve efficient wireless charging in complex underwater environments, some dedicated magnetic coupling structures for AUV wireless charging have been developed. However, these magnetic coupling structures usually change the appearance design of the AUV, making it difficult to achieve stable and efficient charging under the interference of underwater ocean currents. The AUV has a streamlined appearance, which ensures less resistance during underwater navigation. Therefore, if the magnetic coupling structure is installed, the appearance of the AUV needs to be forcibly changed, which will not conform to the optimal fluid mechanics model. In addition, excessive loads and interference from underwater ocean currents cause the coils in the magnetic coupling structure to be misaligned, resulting in unstable charging and low efficiency, which in turn affects the endurance of the AUV. Therefore, it is of great significance for AUV wireless charging to ensure stable and efficient energy transmission under the interference of ocean currents, maintain the streamlined design of the AUV, and prevent misalignment and lightweight design of the magnetic coupling structure. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a bipolar arched magnetic coupling structure for underwater wireless energy transmission and applications thereof.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: a bipolar arched magnetic coupling structure for underwater wireless energy transmission, comprising: a pickup structure and a transmitting structure constituting magnetic coupling,

[0006] The transmitting structure includes a transmitting magnetic core and a bipolar transmitting coil located on the transmitting magnetic core, and the pickup structure includes an arched pickup magnetic core and a pickup coil wound on the pickup magnetic core.

[0007] It also includes: an anti-axial misalignment structure and an anti-rotational misalignment structure, wherein the anti-axial misalignment structure is arranged on the pickup core, and the pickup core is located outside the anti-rotational misalignment structure.

[0008] Preferably, the anti-axial misalignment structure includes two nanocrystalline soft magnetic cores, the nanocrystalline soft magnetic cores are located at the ends of the pickup core, the nanocrystalline soft magnetic cores include an embedded part and an extended part, the embedded part is attached to the end of the pickup core, and the extended part extends to the outside of the pickup core.

[0009] Preferably, the width of the extension portion is greater than the width of the pickup core.

[0010] Preferably, the anti-rotational dislocation structure comprises springs and buffer pads which are symmetrically arranged on both sides of a partition, and the partition is fixedly arranged at a middle position at the bottom of the pickup structure.

[0011] Preferably, one end of the spring is connected to the partition plate, and the other end is connected to the buffer pad.

[0012] Preferably, the bipolar transmitting coil comprises a first transmitting coil and a second transmitting coil, and the first transmitting coil and the second transmitting coil are connected in series in opposite directions.

[0013] Preferably, the first transmitting coil is wound clockwise along the left end of the transmitting magnetic core, and the second transmitting coil is wound counterclockwise along the right end of the transmitting magnetic core.

[0014] Preferably, the transmitting magnetic core and the pickup magnetic core are PC95 ferrite.

[0015] Application of a bipolar arched magnetic coupling structure for underwater wireless energy transmission, the pickup structure is located in an AUV, the transmitting structure is located in an underwater charging dock, and when aligned, the two ends of the pickup magnetic core are kept in the same vertical position as the two ends of the transmitting magnetic core.

[0016] Preferably, the transmitting magnetic core is designed to be arc-shaped in accordance with the curvature of the AUV outer shell, the bipolar transmitting coil is designed to be a curved surface, and the side curvature of the bipolar transmitting coil is consistent with the curvature of the arc-shaped transmitting magnetic core; the anti-axial dislocation structure has a curvature consistent with the curvature of the AUV inner shell, and a gap is left between the anti-rotational dislocation structure and the AUV inner shell.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. A transmitting magnetic core is provided in the transmitting structure, and a pickup magnetic core is provided in the pickup structure, that is, the magnetic core is used to guide the magnetic flux at both the transmitting end and the pickup end, thereby ensuring high coupling between the charging coils and improving the efficiency of energy transmission. In particular, the transmitting magnetic core and the pickup magnetic core are made of PC95 ferrite, which has a good guiding effect.

[0019] 2. The magnetic coupling structure is adapted to the AUV appearance, ensuring the AUV's low-resistance underwater navigation.

[0020] 3. The magnetic coupling structure is provided with an anti-axial dislocation structure and an anti-rotational dislocation structure at the end of the pickup magnetic core. The anti-axial dislocation structure and the anti-rotational dislocation structure enable the underwater wireless charging magnetic coupling structure to have stronger anti-axial dislocation ability and anti-rotational dislocation ability, thereby solving the problem of unstable charging and low efficiency when the coil is misaligned in various situations under the interference of underwater ocean currents.

[0021] 4. In the anti-axial dislocation structure, the width of the extension part is greater than the width of the pickup core, the range of magnetic flux that can be picked up is increased, and the adaptability is strong; the extension part is designed with a certain arc, which can effectively guide the magnetic flux to the bottom of the pickup core.

[0022] 5. In the anti-rotational dislocation structure, the spring absorbs energy and has elastic recovery characteristics to improve the anti-rotational dislocation capability.

[0023] 6. The arc-shaped design of the transmitting magnetic core and the arch-shaped design of the pickup magnetic core are lightweight designs. In addition, the use of nanocrystalline soft magnetic cores in the anti-axial dislocation structure is also conducive to lightweight.

[0024] In summary, the magnetic coupling structure in the present invention uses electromagnetic induction to realize the power transmission from the bipolar transmitting coil to the pickup coil; the magnetic coupling structure has high reliability, simple structure, light weight, high tolerance to rotation and axial misalignment, and can realize stable and efficient wireless power transmission underwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a top view of the magnetic coupling structure in the aligned state in the present invention,

[0026] Figure 2 for Figure 1 Sectional view at AA,

[0027] Figure 3 is a three-dimensional schematic diagram of the anti-axial dislocation structure and the pickup structure in the present invention,

[0028] Figure 4 is a cross-sectional view of the magnetic coupling structure in Example 1,

[0029] Figure 5This is a schematic diagram of the AUV model and the charging dock model in the present invention.

[0030] Figure 6 This is the distribution diagram of the magnetic flux lines of the bipolar transmitting coil.

[0031] Figure 7 To add the magnetic flux distribution diagram of some components of the magnetic coupling structure,

[0032] in,

[0033] 1. AUV model, 2. Charging dock model,

[0034] 11. Charging compartment, 12. Pick-up structure, 13. Anti-axial dislocation structure, 14. Anti-rotational dislocation structure, 21. Launch structure,

[0035] 121. Pick up the magnetic core, 122. Pick up the coil,

[0036] 131. a first soft magnetic core, 132. a second soft magnetic core, 133. an embedded portion, 134. an extension portion,

[0037] 141, a partition, 142, a first spring, 143, a second spring, 144, a first buffer pad, 145, a second buffer pad,

[0038] 211, a transmitting magnetic core, 212, a first transmitting coil, 213, a second transmitting coil. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0040] Combination Figure 1-2It is understood that a bipolar arched magnetic coupling structure for underwater wireless energy transmission includes: a pickup structure 12 and a transmitting structure 21 constituting magnetic coupling, the transmitting structure 21 includes a transmitting magnetic core 211 and a bipolar transmitting coil located on the transmitting magnetic core 211, the pickup structure 12 includes an arched pickup magnetic core 121 and a pickup coil 122 wound on the pickup magnetic core 121, the transmitting magnetic core 211 is arranged in the transmitting structure 21, and the pickup magnetic core 121 is arranged in the pickup structure 12, that is, the magnetic core is used to guide the magnetic flux at both the transmitting end and the picking end, thereby ensuring high coupling between the charging coils and improving the efficiency of energy transmission; it also includes: an anti-axial misalignment structure 13 and an anti-rotational misalignment structure 14, the anti-axial misalignment structure 13 is arranged on the pickup magnetic core 121, and the pickup magnetic core 121 is located outside the anti-rotational misalignment structure 14. The magnetic coupling structure is provided with the anti-axial misalignment structure 13 and the anti-rotational misalignment structure 14 at the end of the pickup core 121. The anti-axial misalignment structure 13 and the anti-rotational misalignment structure 14 enable the underwater wireless charging magnetic coupling structure to have stronger anti-axial misalignment capability and anti-rotational misalignment capability, thereby solving the problem of unstable charging and low efficiency when the coil is misaligned in various situations under the interference of underwater ocean currents.

[0041] In one embodiment, in combination Figure 3 It is understood that the anti-axial misalignment structure 13 includes two nanocrystalline soft magnetic cores, the nanocrystalline soft magnetic cores are located at the ends of the pickup magnetic core 121, and the nanocrystalline soft magnetic cores include an embedded portion 133 and an extended portion 134, the embedded portion 133 is attached to the ends of the pickup magnetic core 121, and the extended portion 134 extends to the outside of the pickup magnetic core 121. The use of nanocrystalline soft magnetic cores in the anti-axial misalignment structure 13 is conducive to lightweight.

[0042] In one embodiment, the width of the extension portion 134 is greater than the width of the pickup core 121. In the anti-axial misalignment structure 13, the width of the extension portion 134 is greater than the width of the pickup core 121, the range of magnetic flux that can be picked up is increased, and the adaptability is strong; in addition, the extension portion 134 is designed with a certain curvature, which can effectively guide the magnetic flux to the bottom of the pickup core 121.

[0043] In one embodiment, in combination Figure 4 It is understood that the anti-rotational dislocation structure 14 includes springs and buffer pads symmetrically arranged on both sides of the partition 141, and the partition 141 is fixedly arranged at the bottom middle position of the pickup structure 12. In the anti-rotational dislocation structure 14, the anti-rotational dislocation capability is improved by the spring's energy absorption and elastic recovery characteristics.

[0044] In one embodiment, one end of the spring is connected to the partition 141 , and the other end is connected to the buffer pad.

[0045] In one embodiment, the bipolar transmitting coil includes a first transmitting coil 212 and a second transmitting coil 213 , and the first transmitting coil 212 and the second transmitting coil 213 are connected in series in opposite directions.

[0046] In one embodiment, the first transmitting coil 212 is wound clockwise along the left end of the transmitting magnetic core 211 , and the second transmitting coil 213 is wound counterclockwise along the right end of the transmitting magnetic core 211 .

[0047] In one embodiment, the emitting magnetic core 211 and the pickup magnetic core 121 are made of PC95 ferrite, which has a good effect on magnetic flux guidance.

[0048] Combination Figure 5 It is understood that the application of the bipolar arched magnetic coupling structure for underwater wireless energy transmission, the pickup structure 12 is located in the charging compartment 11 on the AUV model 1, and the transmitting structure 21 is located in the charging dock model 2. When aligned, the two ends of the pickup magnetic core 121 are kept consistent in vertical position with the two ends of the transmitting magnetic core 211.

[0049] In one embodiment, the transmitting magnetic core 211 is designed to be arc-shaped in accordance with the curvature of the outer shell of the AUV model 1, the bipolar transmitting coil is designed to be curved, and the curvature of the side of the bipolar transmitting coil is consistent with the curvature of the arc-shaped transmitting magnetic core 211; the anti-axial dislocation structure 13 is in accordance with the curvature of the inner shell of the AUV model 1, and a gap is left between the anti-rotational dislocation structure 14 and the inner shell of the AUV model 1. The magnetic coupling structure is adapted to the appearance of the AUV model 1, which should be understood as the appearance of the AUV, ensuring the low-resistance underwater navigation of the AUV.

[0050] Example 1: Combination Figure 1-2 It is understood that a bipolar arched magnetic coupling structure for underwater wireless energy transmission includes: a pickup structure 12 constituting magnetic coupling, a transmitting structure 21, an anti-axial misalignment structure 13 and an anti-rotational misalignment structure 14, wherein the transmitting structure 21 includes an arcuate transmitting magnetic core 211 and a bipolar transmitting coil located on the transmitting magnetic core 211, and the pickup structure 12 includes an arched pickup magnetic core 121 and a spiral pickup coil 122 wound on the pickup magnetic core 121; the anti-axial misalignment structure 13 is arranged on the pickup magnetic core 121, and the pickup magnetic core 121 is located outside the anti-rotational misalignment structure 14.

[0051] The bipolar transmitting coil includes a first transmitting coil 212 and a second transmitting coil 213, and the first transmitting coil 212 and the second transmitting coil 213 are connected in series in opposite directions. For example, the first transmitting coil 212 is wound clockwise along the left end of the transmitting magnetic core 211, and the second transmitting coil 213 is wound counterclockwise along the right end of the transmitting magnetic core 211. The transmitting magnetic core 211 and the pickup magnetic core 121 are PC95 ferrite.

[0052] Embodiment 2: Based on the structure of embodiment 1, Figure 3 It is understood that the anti-axial misalignment structure 13 includes two nanocrystalline soft magnetic cores, namely a first soft magnetic core 131 and a second soft magnetic core 132, the nanocrystalline soft magnetic core is fixed at the left and right ends of the pickup magnetic core 121, and the nanocrystalline soft magnetic core includes an embedded part 133 and an extension part 134, the embedded part 133 is attached to the bottom of both ends of the pickup magnetic core 121, and the extension part 134 extends to the outside of the pickup magnetic core 121 in a certain arc. The width of the extension part 134 is greater than the width of the pickup magnetic core 121.

[0053] Embodiment 3: Based on the structure of embodiment 2, Figure 4 understand, Figure 4 It is also a cross-sectional view of the top view in this embodiment, and the top view is Figure 1 The anti-rotational dislocation structure 14 includes left and right buffer bins, and a carbon fiber partition 141 is fixedly arranged at the bottom middle position of the pickup structure 12. The partition 141 separates the left and right buffer bins. The left buffer bin is used as an example for explanation. The interior of the buffer bin includes a carbon fiber buffer bin shell, a first spring 142 and a first buffer pad 144, wherein one end of the first spring 142 is connected to the partition 141, and the other end is connected to the first buffer pad 144; in the right buffer bin, one end of the second spring 143 is connected to the partition 141, and the other end is connected to the second buffer pad 145, constructing a buffer bin with anti-rotation effect, and the buffer bin is installed at the bottom of the battery bin through the partition 141 and is higher than the bottom of the battery bin by a certain height.

[0054] Combination Figure 5 Understand, the application of the bipolar arched magnetic coupling structure for underwater wireless energy transmission in Example 3, the pickup structure 12 is located in the charging compartment 11 on the AUV model 1, the transmitting structure 21 is located in the charging dock model 2, and the two ends of the pickup magnetic core 121 are aligned to keep the vertical positions of the two ends of the transmitting magnetic core 211 consistent, combined with Figure 4 understand.

[0055] The transmitting magnetic core 211 is designed to be arc-shaped in accordance with the curvature of the outer shell of the AUV model 1, the bipolar transmitting coil is designed to be curved, and the curvature of the side of the bipolar transmitting coil is consistent with the curvature of the arc-shaped transmitting magnetic core 211; the anti-axial dislocation structure 13 is in accordance with the curvature of the inner shell of the AUV model 1, and a gap is left between the anti-rotational dislocation structure 14 and the inner shell of the AUV model 1. The transmitting magnetic core 211 is designed to be arc-shaped, and the pickup magnetic core 121 is designed to be arched, and the structure is designed to be lightweight.

[0056] The working process is described below. For intuitive understanding, the AUV and the underwater charging dock are used directly for explanation, corresponding to the AUV model 1 and the charging dock model 2 in the attached figure.

[0057] Charging process: When the AUV needs to be charged, it automatically returns to the underwater charging dock and the two are precisely aligned through docking technology. The relative position of the magnetic coupling structure after alignment is as follows: Figure 2 and Figure 4 As shown, at this time, the two ends of the pickup core 121 in the AUV are just opposite to the two ends of the transmitting core 211 in the underwater charging dock. At this time, the transmitting structure 21 in the underwater charging dock starts to supply power, and the bipolar transmitting coil generates a time-varying magnetic flux, such as Figure 6 As shown, the magnetic flux is emitted from the center of the second transmitting coil 213, and is initially guided by the second soft magnetic core 132 on the right side and then converges on the arched pickup core 121, and then flows through the arched pickup core 121, where the spiral pickup core 121 charges the battery in the AUV through electromagnetic induction. The magnetic flux then returns to the first transmitting coil 212 at the first soft magnetic core 131 on the left side, and finally completes the magnetic flux loop through the transmitting core 211.

[0058] Understanding of the anti-misalignment mechanism: Under the interference of underwater ocean currents, the AUV will inevitably be misaligned with the underwater charging dock during wireless charging, mainly including rotational misalignment and axial misalignment. Figure 1-4It is explained that when axial misalignment occurs, in the anti-axial misalignment structure 13 made of the nanocrystalline soft magnetic core, the width of the extension 134 is greater than the width of the pickup core 121, and most of the magnetic flux generated by the second transmitting coil 213 can still be picked up when misalignment occurs, and it can be effectively guided to the bottom of the arched pickup core 121. When rotational misalignment occurs, the buffer bin will reduce the impact of rotational misalignment. Take left rotation as an example. When rotation occurs, the right side of the arched pickup core 121 will squeeze the right carbon fiber second buffer pad 145, and then transfer the kinetic energy to the carbon fiber partition 141 through the second spring 143. The left-handed kinetic energy is absorbed by the second spring 143 to offset the kinetic energy during left rotation, and the same is true for right rotation. By making the anti-axial misalignment structure and the anti-rotational misalignment structure, the underwater wireless charging magnetic coupling structure has stronger anti-axial misalignment ability and anti-rotational misalignment ability. Achieving efficient and stable wireless energy supply under the interference of ocean currents.

[0059] The final results of the ANSYS Maxwell finite element simulation model are as follows: Figure 6 As shown in the figure, in order to ensure the clear structure of the simulation result diagram, the buffer bin is hidden. Figure 6 This is the distribution diagram of the magnetic flux lines of the bipolar transmitting coil. Figure 7 This is the distribution diagram of the magnetic flux lines after adding some components of the magnetic coupling structure. The magnetic coupling structure proposed in the present invention effectively guides the magnetic flux with a lightweight magnetic coupling structure without changing the streamlined appearance of the AUV. On the one hand, the structure realizes the effective guidance of the emission magnetic flux through the arched pickup core 121 and the nanocrystalline soft magnetic core installed thereon, most of which is transmitted through the arched pickup core 121. On the other hand, the leakage flux of the emission structure 21 and the pickup structure 12 is reduced, and there is no excessive outflow of magnetic flux lines in the space, so that high coupling between the coils is achieved, while protecting the precision components in the AUV. It also greatly improves the ability of the magnetic coupling structure to resist rotation and axial dislocation. The above is of great significance to the efficient and stable power supply of the AUV.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A bipolar arched magnetic coupling structure for underwater wireless energy transmission, comprising: A pickup structure (12) and a transmitting structure (21) forming a magnetic coupling, characterized in that: The transmitting structure (21) comprises a transmitting magnetic core (211) and a bipolar transmitting coil located on the transmitting magnetic core (211); the picking-up structure (12) comprises an arched picking-up magnetic core (121) and a picking-up coil (122) wound around the picking-up magnetic core (121); It also comprises: an anti-axial misalignment structure (13) and an anti-rotational misalignment structure (14), wherein the anti-axial misalignment structure (13) is arranged on the pickup magnetic core (121), and the pickup magnetic core (121) is located outside the anti-rotational misalignment structure (14). The anti-axial misalignment structure (13) comprises two nanocrystalline soft magnetic cores, the nanocrystalline soft magnetic cores are located at the ends of the pickup magnetic core (121), the nanocrystalline soft magnetic cores comprise an embedded portion (133) and an extended portion (134), the embedded portion (133) is attached to the end of the pickup magnetic core (121), the extended portion (134) extends to the outside of the pickup magnetic core (121), and the width of the extended portion (134) is greater than the width of the pickup magnetic core (121). The anti-rotational misalignment structure (14) comprises a spring and a buffer pad which are arranged symmetrically on both sides of a partition (141); the partition (141) is fixedly arranged at a middle position at the bottom of the pickup structure (12); one end of the spring is connected to the partition (141) and the other end is connected to the buffer pad.

2. The bipolar arched magnetic coupling structure for underwater wireless energy transmission according to claim 1, characterized in that: The bipolar transmitting coil comprises a first transmitting coil (212) and a second transmitting coil (213), wherein the first transmitting coil (212) and the second transmitting coil (213) are connected in series in opposite directions.

3. The bipolar arched magnetic coupling structure for underwater wireless energy transmission according to claim 2, characterized in that: The first transmitting coil (212) is wound clockwise along the left end of the transmitting magnetic core (211), and the second transmitting coil (213) is wound counterclockwise along the right end of the transmitting magnetic core (211).

4. The bipolar arched magnetic coupling structure for underwater wireless energy transmission according to claim 1, characterized in that: The transmitting magnetic core (211) and the picking-up magnetic core (121) are PC95 ferrite.

5. The bipolar arched magnetic coupling structure for underwater wireless energy transmission according to claim 1, characterized in that: The pickup structure (12) is located in the AUV, and the launch structure (21) is located in the underwater charging dock, and when aligned, the two ends of the pickup magnetic core (121) and the two ends of the launch magnetic core (211) maintain consistent vertical positions.

6. The bipolar arched magnetic coupling structure for underwater wireless energy transmission according to claim 1, characterized in that: The transmitting magnetic core (211) is designed to be in an arc shape consistent with the curvature of the AUV outer shell, the bipolar transmitting coil is designed to be a curved surface, and the curvature of the side of the bipolar transmitting coil is consistent with the curvature of the arc-shaped transmitting magnetic core (211); the anti-axial misalignment structure (13) is in an arc shape consistent with the curvature of the AUV inner shell, and a gap is left between the anti-rotational misalignment structure (14) and the AUV inner shell.

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