Multi-core cable current collection circuit energy taking coil

Abstract

The utility model discloses a multi-core cable current collection line energy taking coil, comprising a first skeleton, a second skeleton and a third skeleton which are nested in sequence, and the three skeletons have the same central axis and are arranged at intervals to form a space; the plurality of outer side partition plates are uniformly distributed around the central axis and are arranged between the second framework and the third framework so as to divide the space between the second framework and the third framework into a plurality of outer side spaces; the plurality of inner side partition plates are uniformly distributed around the central axis and are arranged between the first framework and the second framework so as to divide the space between the first framework and the second framework into a plurality of inner side spaces; magnetic cores are arranged in the outer side space and the inner side space; and the coil is wound on the framework according to a limited area between the adjacent outer side partition plates. According to the utility model, the framework is divided into a plurality of spaces for accommodating the magnetic cores, and the coils are wound in a distributed manner, so that the output efficiency of the energy-taking coil when the energy-taking coil is applied to a multi-core cable is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of line power taking devices, in particular to an energy taking coil for a multi-core cable collector line. Background Art

[0002] In wind power generation systems, a three-core cable collection line is usually used on the 35kV high-voltage side of the wind turbine's transformer to transmit three-phase AC power. Since the three-phase AC power is 120 degrees out of phase with each other, the magnetic fields generated by the current-carrying conductors inside the three-core cable in the surrounding space will be superimposed on each other, resulting in an uneven distribution of the magnetic field around the cable and different phases of the magnetic field strength at different locations.

[0003] Existing energy harvesting coils are typically made by wrapping a full circle of copper wire around a toroidal iron core. This structure exhibits excellent energy harvesting efficiency when applied to single-core cables, as the magnetic flux density modulus is uniform at all points along a circle centered on the single-core cable, resulting in a uniform magnetic field distribution and consistent phase. However, when applied to three-core cables, the magnetic flux density modulus is significantly reduced due to the unevenness of the magnetic field strength and the difference in phase. Using a fully wrapped copper coil makes it difficult to achieve a high output voltage, thus affecting the output performance of the entire energy harvesting module. Utility Model Content

[0004] The main purpose of the utility model is to provide an energy-taking coil for a multi-core cable collector circuit, so as to solve the problem of low output efficiency when the energy-taking coil in the prior art is applied to a multi-core cable.

[0005] To achieve the above objectives, the present invention proposes a multi-core cable collector circuit energy taking coil, comprising:

[0006] A first frame, a second frame, and a third frame are nested in sequence, the three frames having the same central axis and spaced apart from each other to form a space, the first frame forming a sensing channel;

[0007] a plurality of outer partitions, provided between the second frame and the third frame, the outer partitions being evenly distributed around the central axis to divide the space between the second frame and the third frame into a plurality of outer spaces;

[0008] a plurality of inner partitions, disposed between the first frame and the second frame, the inner partitions being evenly distributed around the central axis to divide the space between the first frame and the second frame into a plurality of inner spaces;

[0009] a magnetic core, wherein the outer space and the inner space are both provided with the magnetic core; and

[0010] The coil is wound on the first frame, the second frame and the third frame according to the limited area between the adjacent outer partitions.

[0011] Optionally, six outer partitions are included, and the angle between two adjacent outer partitions is 60°, or,

[0012] The outer partitions include nine of the nine outer partitions, and the angle between two adjacent outer partitions is 40 degrees, or

[0013] It comprises twelve outer partitions, and the angle between two adjacent outer partitions is 30 degrees.

[0014] Optionally, the number of the inner partitions is consistent with the number of the outer partitions.

[0015] Optionally, the inner partitions and the outer partitions are arranged alternately so that the inner partition is located between two adjacent outer partitions.

[0016] Optionally, the first skeleton, the second skeleton and the third skeleton are concentric hollow cylinders.

[0017] Optionally, the cylindrical radii of the first skeleton, the second skeleton and the third skeleton are equidistantly distributed.

[0018] Optionally, the magnetic core is made of soft ferrite, and the thickness of the magnetic cores arranged in the outer space and the inner space is consistent.

[0019] Optionally, the first frame, the second frame and the third frame are PCB frames.

[0020] Optionally, the outer partition and the inner partition are PCB boards.

[0021] Optionally, the coil is wound with enameled wire.

[0022] In the technical solution of the present invention, the energy-taking coil of the multi-core cable collector circuit includes a first skeleton, a second skeleton, and a third skeleton that are nested in sequence. The first skeleton forms an induction channel. The space between the first skeleton and the second skeleton is divided into a plurality of inner spaces by a plurality of inner partitions. The space between the second skeleton and the third skeleton is divided into a plurality of outer spaces by a plurality of outer partitions. Magnetic cores are provided in the inner spaces and the outer spaces. The coils are wound on the three skeletons according to the areas defined by the outer spaces. It can be understood that the coil of the present technical solution is composed of three skeletons that are nested in sequence. The skeletons are divided into a plurality of spatial regions by partitions, and a distributed winding coil is adopted. On the one hand, this skeleton structure can change the layout of the magnetic core of the energy-taking coil, thereby increasing the gap between the magnetic cores and reducing the magnetic permeability, avoiding the magnetic saturation phenomenon under large AC signals, and improving the performance and stability of the energy-taking coil. On the other hand, this coil winding method can avoid the mutual cancellation of induced voltages between the turns of the coil due to the phase difference of the spatial magnetic field. Compared with the structure of winding a complete single coil on the iron core, the output efficiency of the energy-taking coil is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a perspective view of the three-dimensional structure of the energy-taking coil of the multi-core cable collector circuit in one embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the skeleton of the energy-taking coil of the multi-core cable collector circuit in one embodiment of the present utility model;

[0026] Figure 3 This is a plan view of the energy taking coil of the multi-core cable collector circuit after winding the coil in one embodiment of the present utility model;

[0027] Figure 4 This is a planar schematic diagram of an energy-taking coil of a multi-core cable collector circuit applied to a three-core cable in one embodiment of the present invention.

[0028] Description of Figure Numbers:

[0029]

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] The main purpose of the present invention is to provide a multi-core cable collector circuit energy extraction coil 100 to solve the problem of low energy extraction power in the induction power extraction device in the prior art.

[0034] See also Figures 1 to 4 In one embodiment of the present invention, a multi-core cable collector circuit energy-taking coil 100 includes a first frame 110, a second frame 120, and a third frame 130 nested in sequence. The three frames have the same central axis and are spaced apart from each other to form a space. The first frame 110 forms an induction channel 110a; a plurality of outer partitions 140 are arranged between the second frame 120 and the third frame 130. The outer partitions 140 are evenly distributed around the central axis to divide the space between the second frame 120 and the third frame 130 into a plurality of outer partitions. side space 140a; a plurality of inner partitions 150, arranged between the first frame 110 and the second frame 120, the inner partitions 150 are evenly distributed around the central axis to divide the space between the first frame 110 and the second frame 120 into a plurality of inner spaces 150a; a magnetic core 160, a magnetic core 160 is provided in both the outer space 140a and the inner space 150a; and a coil 170, the coil 170 is wound on the first frame 110, the second frame 120 and the third frame 130 according to the defined area between adjacent outer partitions 140.

[0035] In the technical solution of the present invention, the multi-core cable collector circuit energy-taking coil 100 includes a first skeleton 110, a second skeleton 120 and a third skeleton 130 nested in sequence. The first skeleton 110 forms an induction channel 110a. The space between the first skeleton 110 and the second skeleton 120 is divided into a plurality of inner spaces 150a by a plurality of inner partitions 150. The space between the second skeleton 120 and the third skeleton 130 is divided into a plurality of outer spaces 140a by a plurality of outer partitions 140. A magnetic core 160 is provided in the inner space 150a and the outer space 140a. The coil 170 is arranged on the three skeletons according to the area defined by the outer space 140a. It can be understood that the coil of the present technical solution is composed of three skeletons nested in sequence, which are divided into multiple spatial areas by partitions, and a distributed winding coil is adopted; on the one hand, this skeleton structure can change the layout of the magnetic core 160 of the energy-taking coil, so that the gap of the magnetic core 160 increases, the magnetic permeability is reduced, and the magnetic saturation phenomenon under large AC signals is avoided, thereby improving the performance and stability of the energy-taking coil; on the other hand, this coil winding method can avoid the mutual cancellation of induced voltages between the turns of the coil due to the phase difference of the spatial magnetic field. Compared with the structure of winding a complete single coil on the iron core, the output efficiency of the energy-taking coil is greatly improved.

[0036] Specifically, in one embodiment, the application of the multi-core cable collector circuit energy extraction coil 100 to a three-core cable for power extraction is taken as an example. First, the magnetic field distribution pattern around the three-core cable is described: on the circumference of the circle with the center of the three-core cable as the center, the magnetic induction intensity modulus of each point is constantly changing, but the magnetic induction intensity modulus has a maximum value at the three positions closest to the conductor, and the magnetic induction intensity modulus between adjacent positions on the circumference is approximately "V" distributed. The central angle corresponding to the arc length between adjacent positions is 120°, and the phase difference is also 120°. In this embodiment, the first skeleton 110, the second skeleton 120 and the third skeleton are nested in sequence to form the overall skeleton structure of the coil. The first skeleton 110 and the second skeleton 120 form the inner layer, and the second skeleton 120 and the third skeleton 130 form the outer layer. The first skeleton 110 forms an induction channel 110a. When the three-core cable passes through the induction channel 110a, an induced magnetic field is generated. The inner layer and the outer layer are respectively evenly arranged with a number of inner partitions 150 and outer partitions to form a number of inner spaces 150a and outer spaces 140a. The inner space 150a and the outer space 140a are both provided with a magnetic core 160, so that the gap of the magnetic core 160 is appropriately increased. At the same time, the coil 170 is distributed according to the limited area of ​​the outer space 140a, and a number of magnetic induction areas are formed accordingly. Compared with the structure of winding a complete single coil on the magnetic core 160, the output efficiency of the energy extraction coil is greatly improved.

[0037] It can be understood that the key point of this solution is to divide a number of spaces by a number of partitions to install the magnetic core 160, thereby increasing the gap between the magnetic core 160, reducing the magnetic permeability, and improving the performance of the energy-taking coil. Therefore, in some other embodiments, more than three skeletons can be nested together. For example, taking a hollow cylinder in which the skeletons are all coaxial as an example, in another embodiment, the energy-taking coil is formed by four skeletons nested in sequence, and the space formed between the skeletons is arranged with a number of partitions to divide a number of spaces for installing the magnetic core 160. In this way, the technical effect of this solution can also be achieved. Similarly, five, six, or other numbers of skeletons can be set, which will not be repeated here. The embodiments of the present utility model are not limited to this, and the above are all within the scope of protection of the present utility model.

[0038] It should be noted that the present invention is not limited to application in energy extraction from three-core cable collection lines. In actual applications, according to the magnetic field distribution law of cables with different core numbers, the skeleton structure and distributed winding coils of this scheme can effectively improve the output efficiency of the energy extraction coil.

[0039] Further, see Figures 1 to 4 In one embodiment of the present invention, six outer partitions 140 are included, and the angle between two adjacent outer partitions 140 is 60°, or nine outer partitions 140 are included, and the angle between two adjacent outer partitions 140 is 40°, or twelve outer partitions 140 are included, and the angle between two adjacent outer partitions 140 is 30°.

[0040] Specifically, in this embodiment, taking six outer partitions 140 as an example, the six outer partitions 140 are arranged between the second frame 120 and the third frame 130, and are evenly distributed with a plane angle of 60° between each of the six outer partitions 140, with the central axis as the origin, dividing the space between the second frame 120 and the third frame 130 into six outer spaces 140a with the same area and volume. Each outer space 140a is provided with a magnetic core 160. It can be understood that the coil 170 is arranged according to the area of ​​the six outer spaces 140a. Further, referring again to Figure 4When the multi-core cable collector circuit energy coil 100 is used to extract power from a three-core collector cable, based on the magnetic field distribution pattern around the three-core cable, induction coil area A, induction coil area B, and induction coil area C are formed. This can utilize the magnetic field distribution pattern around the three-core cable to avoid the situation where the induced voltage between the turns of the coils is canceled due to the spatial magnetic field phase difference. This arrangement, on the one hand, can easily adjust the position of the energy coil, so that the energy coil can be quickly aligned with the nearest position to any phase conductor of the three-core cable during use, and provides a certain degree of mechanical stability and structural integrity. On the other hand, the uniform division into six parts can make the magnetic field more uniform in all directions, reduce the situation where the local magnetic field is too strong or too weak, more effectively utilize magnetic energy, reduce energy loss, and improve the energy extraction efficiency of the energy coil. Of course, in some other embodiments, the number of outer partitions 140 can also be set to nine or twelve, evenly distributed between the second partition and the third partition at an angle of 40° and 30°, respectively. It should be noted that after testing, the energy extraction effect is best when six outer partitions 140 are set. The embodiments of the present invention are not limited thereto, and all of the above are within the protection scope of the present invention.

[0041] Further, see Figures 1 to 4 In one embodiment of the present invention, the number of inner partitions 150 is the same as the number of outer partitions 140. The same number of inner partitions 150 and outer partitions 140 helps to achieve a uniform distribution of the magnetic field in the magnetic core 160, reduces the magnetic saturation area, and can also optimize specific magnetic flux paths so that the magnetic flux passes through key areas more concentratedly.

[0042] Further, see Figures 1 to 4 In one embodiment of the present invention, the inner partitions 150 are arranged in a staggered manner with the outer partitions 140, such that the inner partitions 150 are located between two adjacent outer partitions 140. Specifically, in this embodiment, the number of outer partitions 140 and inner partitions 150 is the same, and they are evenly distributed around the central axis at the same angle, and the inner partitions 150 and outer partitions 140 are arranged in a staggered manner. Preferably, the inner partition 150 is located in the middle of the angle formed by two adjacent outer partitions 140. For example, if two adjacent outer partitions 140 form a 60° angle, the inner partition 150 divides the angle into two 30° sides. With such an arrangement, on the one hand, the staggered outer partitions 140 and inner partitions 150 can serve as the structure of the supporting skeleton to fix the entire skeleton structure; on the other hand, the gap between the magnetic cores 160 can be increased, and the staggered arrangement of the inner partitions 150 and the outer partitions 140 can reduce the leakage magnetic field at the gap between the magnetic cores 160, because the magnetic lines of force always gather towards the material with greater magnetic permeability, thus ensuring the mutual flow of magnetic lines of force between the gap between the inner magnetic core 160 and the gap between the outer magnetic core 160.

[0043] Further, see Figures 1 to 4 In one embodiment of the present invention, the first skeleton 110, the second skeleton 120 and the third skeleton 130 are concentric hollow cylinders. Specifically, in this embodiment, the first skeleton 110, the second skeleton 120 and the third skeleton 130 are three hollow cylinders with different radii. With the same central axis as the center of the circle, the three cylinders are nested in sequence to form the overall skeleton structure of the energy extraction coil, and the overall structure presents a three-layer cylindrical structure. Such a setting can provide a structure with higher mechanical stability, increase the overall rigidity of the energy extraction coil skeleton, and resist mechanical vibration and impact. Of course, in some other embodiments, the skeleton can also take other forms, such as a rectangular hollow cylinder, a polygonal structure, a spherical and other three-dimensional structures, and the embodiments of the present invention are not limited thereto, and the above are all within the scope of protection of the present invention.

[0044] Further, see Figures 1 to 4 In one embodiment of the present invention, the cylindrical radii of the first frame 110, the second frame 120, and the third frame 130 are distributed equidistantly. It will be appreciated that the spacing between each of the first frame 110, the second frame 120, and the third frame 130 is consistent. This equidistant distribution of radii can make the stress on the cylindrical wall more uniform, thereby improving the structural stability and durability of the energy harvesting coil. It can also optimize the magnetic field distribution, reduce high-gradient magnetic field regions, and reduce the risk of magnetic saturation.

[0045] Further, see Figures 1 to 4 In one embodiment of the present invention, the magnetic core 160 is a soft ferrite, and the thickness of the magnetic core 160 arranged in the outer space 140a and the inner space 150a is consistent. Specifically, in this embodiment, the magnetic core 160 is a soft ferrite, and its thickness is determined by the gap between the first skeleton 110, the second skeleton 120, and the third skeleton 130. Since the first skeleton 110, the second skeleton 120, and the third skeleton 130 are configured as coaxial hollow cylinders with equidistant cylindrical radii, the intervals between the three skeletons are the same, and the thickness of the magnetic core 160 in the outer space 140a and the inner space 150a is consistent. Such a configuration helps to ensure a uniform distribution of the magnetic field, avoid uneven distribution of magnetic flux density, reduce local saturation of the energy harvesting coil, and improve the energy harvesting efficiency and performance of the energy harvesting coil.

[0046] Further, see Figures 1 to 4In one embodiment of the present invention, the first frame 110, the second frame 120, and the third frame 130 are PCB frames. PCB materials are used to make the frames, which have good insulation properties and a low dielectric constant, helping to improve the electrical performance of the energy harvesting coil. PCB materials are also beneficial for heat conduction, helping to dissipate the heat generated by the energy harvesting coil during operation, thereby improving the heat dissipation efficiency of the energy harvesting coil. PCB materials are also inexpensive, helping to reduce production costs. In other embodiments, phenolic resin frames, epoxy resin frames, ABS frames, carbon fiber frames, etc. may also be used, depending on actual conditions and are not limited here.

[0047] Further, see Figures 1 to 4 In one embodiment of the present invention, both the outer partition 140 and the inner partition 150 are PCBs. Using thin PCBs of a certain thickness to form the outer partition 140 and the inner partition 150 solves the problem of low energy extraction power due to the high mechanical strength of PCBs. The structure of the outer partition 140 and the inner partition 150 further stabilizes the skeleton structure of the entire energy extraction coil, reducing the risk of damage due to vibration or mechanical impact. Furthermore, the PCB partitions also have good corrosion resistance and thermal conductivity, effectively extending the service life of the energy extraction coil.

[0048] Further, see Figures 1 to 4In one embodiment of the present invention, the coil 170 is wound using enameled wire. Specifically, in this embodiment, copper enameled wire is used for winding. Enameled wire is a material commonly used for winding the coil 170 and is primarily composed of a metal conductor and an insulating enameled layer. The enameled wire performs the following functions in the energy harvesting coil: 1. Electromagnetic induction: When a multi-core cable passes through the induction channel 110a of the energy harvesting coil, the current in the cable generates a magnetic field, and the magnetic flux inside the enameled wire-wound coil 170 changes accordingly. According to Faraday's law of electromagnetic induction, the change in magnetic flux in the coil 170 induces an induced electromotive force, thereby generating an induced current. By measuring the induced current in the coil 170, the current in the conductor can be indirectly measured. 2. Signal conversion: The induced current generated by the enameled wire-wound coil 170 is converted into a corresponding voltage or current output signal, which is then output to a measuring instrument or control system after passing through a signal processing circuit. This achieves the measurement and monitoring of current-carrying conductors. 3. Isolation and protection: The coil 170 wound with enameled wire serves as an isolation and protection device, isolating the measured cable from the measuring instrument or control system, avoiding electrical isolation issues caused by current measurement, and ensuring measurement accuracy and safety. Enameled wire has good anti-interference properties, which can reduce the impact of external interference on the current signal, thereby increasing the magnetic induction intensity. In addition, the enameled wire has a certain degree of softness and plasticity, making it easy to wind into coils of various shapes and easy to connect and install, reducing the complexity of manufacturing and installation. Of course, in other embodiments, while ensuring insulation protection between the inner and outer sides of the sensing electrode 120 and the metal electrode 140, the enameled wire can also be made of other conductive materials, such as aluminum enameled wire, alloy enameled wire, bimetallic enameled wire, etc. The insulating layer (paint film) of the enameled wire can also be made of corresponding materials according to actual usage, such as polyester enameled wire, polyurethane enameled wire, composite coated enameled wire, etc. The embodiments of the present invention are not limited to these, and all of the above are within the scope of protection of the present invention.

[0049] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by utilizing the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-core cable collector circuit energy taking coil, characterized in that: include: A first frame, a second frame, and a third frame are nested in sequence, the three frames having the same central axis and spaced apart from each other to form a space, the first frame forming a sensing channel; a plurality of outer partitions, provided between the second frame and the third frame, the outer partitions being evenly distributed around the central axis to divide the space between the second frame and the third frame into a plurality of outer spaces; a plurality of inner partitions, disposed between the first frame and the second frame, the inner partitions being evenly distributed around the central axis to divide the space between the first frame and the second frame into a plurality of inner spaces; a magnetic core, wherein the outer space and the inner space are both provided with the magnetic core; and The coil is wound on the first frame, the second frame and the third frame according to the limited area between the adjacent outer partitions.

2. The multi-core cable collector circuit energy taking coil according to claim 1, characterized in that: It comprises six outer partitions, and the angle between two adjacent outer partitions is 60°, or it is characterized in that: The invention comprises nine outer partitions, and the angle between two adjacent outer partitions is 40 degrees, or it is characterized in that: It comprises twelve outer partitions, and the angle between two adjacent outer partitions is 30 degrees.

3. The multi-core cable collector circuit energy taking coil according to claim 1 or 2, characterized in that: The number of the inner partitions is the same as the number of the outer partitions.

4. The multi-core cable collector circuit energy taking coil according to claim 3, characterized in that: The inner partitions and the outer partitions are arranged alternately so that the inner partition is located between two adjacent outer partitions.

5. The multi-core cable collector circuit energy taking coil according to claim 1 or 2, characterized in that: The first skeleton, the second skeleton and the third skeleton are concentric hollow cylinders.

6. The multi-core cable collector circuit energy taking coil according to claim 5, characterized in that: The cylindrical radii of the first skeleton, the second skeleton and the third skeleton are equidistantly distributed.

7. The multi-core cable collector circuit energy taking coil according to claim 5, characterized in that: The magnetic core is made of soft ferrite, and the thickness of the magnetic cores arranged in the outer space and the inner space is consistent.

8. The multi-core cable collector circuit energy taking coil according to claim 1 or 2, characterized in that: The first frame, the second frame and the third frame are PCB frames.

9. The multi-core cable collector circuit energy taking coil according to claim 1 or 2, characterized in that: The outer partition plate and the inner partition plate are PCB boards.

10. The multi-core cable collector circuit energy taking coil according to claim 1 or 2, characterized in that: The coil is wound with enameled wire.

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