CN109756031B - Wireless energy coupler with coaxial structure - Google Patents
Wireless energy coupler with coaxial structure Download PDFInfo
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- CN109756031B CN109756031B CN201910155470.8A CN201910155470A CN109756031B CN 109756031 B CN109756031 B CN 109756031B CN 201910155470 A CN201910155470 A CN 201910155470A CN 109756031 B CN109756031 B CN 109756031B
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Abstract
The invention discloses a wireless energy coupler with a coaxial structure, which comprises an outer magnetic ring and an inner magnetic ring which are coaxially arranged, wherein the outer magnetic ring is sleeved outside the inner magnetic ring, the outer magnetic ring and the inner magnetic ring are respectively arranged into a circular ring shape by a plurality of magnetic stripes, a C-shaped magnetic core is arranged inside the magnetic stripes, and the opening of the C-shaped magnetic core of the outer magnetic ring is opposite to the opening of the C-shaped magnetic core of the inner magnetic ring; first coil winding is around the inner wall in outer coil with the heliciform, and second coil winding is around the outer wall in interior magnetic coil with the heliciform, and first coil winding is connected with the transmitting terminal, and the second coil winding is connected with the receiving terminal, and perhaps first coil winding is connected with the receiving terminal, and the second coil winding is connected with the transmitting terminal, and the outside of first coil winding, second coil winding all is surrounded by metal material's shell completely. The invention improves the coupling coefficient of the receiving and transmitting coil, reduces the influence of the position offset of the transmitting end and the receiving end on the coupling coefficient, improves the wireless energy transmission efficiency and avoids electromagnetic interference on external equipment.
Description
Technical Field
The invention belongs to the technical field of wireless energy transmission, and relates to a wireless energy coupler with a coaxial structure, which is used for wireless energy transmission on a space satellite.
Background
The wireless power transmission technology is mainly based on the electromagnetic induction principle, and can transmit the energy of a transmitting end to electrical equipment of a receiving end through an air gap. Nowadays, WPT systems are widely used for wireless power supply of implantable biomedical devices, wireless power supply of rotating mechanisms, wireless charging of electric vehicles, wireless power supply of mobile robots, and the like. The wireless energy transmission technology is applied to instruments with high precision requirements in aerospace, interference sources can be eliminated through space isolation in a weightless environment, and the precision and the stability of the platform are effectively improved.
The main factor limiting the accuracy and stability of the satellite is the platform interference caused by moving and flexible parts. To isolate the vibration, a non-contact method may be used for power transmission to completely eliminate the power line and avoid vibration and interference due to the power line. When the satellite completes the launch and enters orbit, the load bay will hang in the service bay without mechanical contact to avoid propagation of vibrations. The following problems need to be solved:
1) the transmitter and receiver are undergoing arbitrary relative motion and the coupling coefficient will change, causing the power transfer to fluctuate accordingly.
2) The transmitter and receiver generate magnetic field radiation that presents electromagnetic interference to external devices.
3) The metal shell generates vortex effect, which causes the efficiency to be reduced, and the coupling coefficient of the transmitting and receiving coil is smaller under the surrounding of the metal shell.
Disclosure of Invention
In order to solve the above problems, the present invention provides a wireless energy coupler with a coaxial structure, which improves a coupling coefficient of a transceiver coil, reduces an influence of a position offset between a transmitting end and a receiving end on the coupling coefficient, improves wireless energy transmission efficiency, avoids electromagnetic interference on external devices, and solves problems existing in the prior art.
The technical scheme adopted by the invention is that the wireless energy coupler with the coaxial structure comprises an outer magnetic ring and an inner magnetic ring which are coaxially arranged, wherein the outer magnetic ring is sleeved outside the inner magnetic ring, the outer magnetic ring and the inner magnetic ring are respectively arranged into a circular ring shape by a plurality of magnetic stripes, a C-shaped magnetic core is arranged inside the magnetic stripes, and the opening of the C-shaped magnetic core of the outer magnetic ring is opposite to the opening of the C-shaped magnetic core of the inner magnetic ring; first coil winding is around the inner wall in outer coil with the heliciform, and second coil winding is around the outer wall in interior magnetic coil with the heliciform, and first coil winding is connected with the transmitting terminal, and the second coil winding is connected with the receiving terminal, and perhaps first coil winding is connected with the receiving terminal, and the second coil winding is connected with the transmitting terminal, and the outside of first coil winding, second coil winding all is surrounded by metal material's shell completely.
Furthermore, the outer magnetic ring is attached to and wraps the first coil winding, and the inner magnetic ring is attached to and wraps the second coil winding.
Furthermore, the C-shaped magnetic core is integrally formed or assembled into a corresponding shape through magnetic stripes.
Further, the width of a gap between the first coil winding and the second coil winding is 3mm-20 mm.
Further, the shell is made of aluminum alloy.
Furthermore, the interior of the inner magnetic ring and the outer shell are enclosed to form an inner cabin body.
Furthermore, the outer magnetic coil and the inner magnetic coil are arranged between the outer wall of the receiving end and the outer wall of the transmitting end.
The invention has the advantages that the wireless energy coupler with the coaxial structure has the following advantages:
1. compared with a common wireless energy transmission structure, the coupler with the coaxial structure can reduce the influence of the position offset of the transmitting end and the receiving end on the coupling coefficient, the coupling coefficient of the transmitting coil is small along with the variation of the position offset (including the offset in the vertical direction and the offset in the horizontal direction), and the influence of the position offset on the wireless energy transmission efficiency is reduced.
2. The C-shaped magnetic core effectively avoids the vortex effect of the metal shell, helps to guide magnetic flux from the transmitting coil to the receiving coil, improves the magnetic flux coupled to the receiving coil, reduces magnetic leakage, improves the coupling coefficient of the transmitting and receiving coil, and improves wireless energy transmission efficiency.
3. The outsides of the first coil winding and the second coil winding are completely surrounded by the shell made of metal materials, and according to the principle of metal isolation, the electromagnetic interference can be controlled to be induced and radiated from one area to another area, so that the electromagnetic interference on external equipment is avoided.
4. The WPT technology is utilized to ensure the stable and sufficient power supply of the service cabin, the split type design of the load cabin and the service cabin is realized through the wireless energy coupler, the wireless energy transmission is applied to the charging of the precision equipment in the weightless environment, and the precision degree of the precision equipment is improved through space isolation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of an inner magnetic stripe and an outer magnetic stripe in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a C-shaped magnetic core in an embodiment of the invention.
In the figure, 1 is a shell, 2 is a first coil winding, 3 is a second coil winding, 4 is an outer magnetic coil, 41 is a magnetic strip, 42 is a C-shaped magnetic core, 5 is an inner magnetic coil, 6 is a transmitting end, 7 is a receiving end, and 8 is an inner cabin.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a wireless energy coupler, as shown in fig. 1-3, comprising an outer magnetic coil 4 and an inner magnetic coil 5 which are coaxially arranged, wherein the outer magnetic coil 4 is sleeved outside the inner magnetic coil 5, a first coil winding 2 is spirally wound on the inner wall of the outer magnetic coil 4, a second coil winding 3 is spirally wound on the outer wall of the inner magnetic coil 5, the first coil winding 2 is connected with a transmitting end 6, the second coil winding 3 is connected with a receiving end 7, or the first coil winding 2 is connected with the receiving end 7, the second coil winding 3 is connected with the transmitting end 6, and the outer magnetic coil 4 and the inner magnetic coil 5 are arranged between the outer wall of the receiving end 7 and the outer wall of the transmitting end 6; the first coil winding 2 and the second coil winding 3 are completely surrounded by the metal casing 1, and the inner magnetic coil 5 and the casing 1 are surrounded to form an inner cabin 8 for placing a circuit module, but the circuit module can be optionally arranged outside.
Because the first coil winding 2 and the second coil winding 3 are coaxial, that is, the first coil winding 2 and the second coil winding 3 are structurally symmetrical, the transmitting end 6 and the receiving end 7 can be exchanged according to the requirements of an application scene, that is, the first coil winding 2 is a transmitting coil, the second coil winding 3 is a receiving coil (outward-transmitting and inward-receiving), or the second coil winding 3 is a transmitting coil, and the first coil winding 2 is a receiving coil (inward-transmitting and outward-receiving).
The outer magnetic ring 4 and the inner magnetic ring 5 are respectively formed by arranging a plurality of magnetic strips 41 into a circular ring shape, a C-shaped magnetic core 42 is arranged inside each magnetic strip 41, the opening of the C-shaped magnetic core 42 of the outer magnetic ring 4 is opposite to the opening of the C-shaped magnetic core 42 of the inner magnetic ring 5, and the more the openings are aligned, the higher the coupling efficiency is; the material of the magnetic strip 41 is MnZn power ferrite material, and is not limited to other magnetic materials. The C-shaped core 42 is complicated in structure, and if it cannot be integrally formed, it can be assembled into a desired shape by a magnetic stripe.
The clearance between first coil winding 2 and the second coil winding 3 provides the activity space of receiving and dispatching both ends, and the clearance width between first coil winding 2 and the second coil winding 3 is 3mm-20mm, can adjust according to the external diameter of first coil winding 2 and second coil winding 3. The outer diameter of the first coil winding 2 is unchanged, and the smaller the outer diameter of the second coil winding 3 is, the larger the gap is; the outer diameter of the second coil winding 3 is constant, and the larger the outer diameter of the first coil winding 2 is, the larger the gap is.
The outer magnetic coil 4 and the inner magnetic coil 5 have the magnetic conduction effect, the outer magnetic coil 4 is tightly attached to and wraps the first coil winding 2, the inner magnetic coil 5 is tightly attached to and wraps the second coil winding 3, the magnetic flux of the transmitting coil is guided towards the horizontal direction, the magnetic leakage is reduced, the inductive coupling coefficient is improved, and if the inner magnetic coil 5 and the outer magnetic coil 4 are lacked, a large amount of leakage inductance is generated, so that the inductive coupling coefficient is reduced; the height of the outer magnetic ring 4 and the inner magnetic ring 5 is too large, so that the volume is increased, and if the height is too small, the coils cannot be wrapped, so that the magnetic coupling coefficient is influenced; the radiuses of the outer magnetic ring 4 and the inner magnetic ring 5 are determined by the radiuses of the corresponding coils, the size is determined according to scene requirements, and the larger the gap of wireless energy transmission is, the larger the radius of the outer magnetic ring 4 or the inner magnetic ring 5 is required to be.
The metal shell 1 completely surrounds the first coil winding 2 and the second coil winding 3, and can control the induction and radiation transmission of electromagnetic interference from one area to another area according to the principle of metal isolation, so as to avoid the electromagnetic interference on external equipment; the shell 1 is made of aluminum alloy, and has the advantages of small density, high strength, good heat-conducting property, corrosion resistance and the like.
The working principle is as follows:
the outer magnetic ring 4 and the inner magnetic ring 5 of the coupler are of a coaxial structure, so that the influence of the position deviation (vertical direction deviation and horizontal direction) of the transmitting end and the receiving end on the coupling coefficient can be avoided; the magnetic strip 41 helps to direct the magnetic flux from the transmitter coil to the receiver coil; at the same time, most of the magnetic flux is coupled to the receiving coil, which can give a sufficiently large coupling coefficient k. It is noted that leakage flux in the vertical direction may produce a vortex effect through the metal housing 1, which may result in heat generation and energy loss. The magnetic strip 41 is made of magnetic materials and has the function of magnetic conduction, the magnetic flux generated by the primary coil is horizontally guided from the vertical direction through the C-shaped magnetic core 42, the leakage inductance is reduced, and the secondary coil in the horizontal direction obtains more magnetic flux, so that the coupling inductance is enhanced, and the coupling coefficient k is improved. Compared with the traditional structure, when the coupler coil is in position deviation, the magnetic leakage is reduced due to the magnetic conduction effect of the C-shaped magnetic core 42, so that the higher coupling coefficient can be kept, and the vortex effect of the shell 1 can be effectively avoided.
The coupling coefficient of the receiving and transmitting coil is more than 0.7, and the coupling coefficient of the receiving and transmitting coil when the positions of the receiving and transmitting ends of the coupler deviate is shown in table 1;
TABLE 1 coupling coefficient of the transmitting and receiving coil when the position of the transmitting and receiving ends of the coupler is deviated
As can be seen from table 1, the coupler of the present invention can avoid the influence of the positional deviation (the vertical deviation and the horizontal deviation) of the transmitting end and the receiving end on the coupling coefficient, so that the coupling coefficient of the transmitting coil is greater than 0.7, and the power transfer is stable.
The WPT technology is applied to instruments with high precision requirements, so that interference sources are eliminated through space isolation, and the precision and the stability of the platform can be effectively improved. For example, satellites in space require increased pointing accuracy. The main factor limiting the accuracy and stability of the satellite is the platform interference caused by moving and flexible parts. To isolate the vibration, a non-contact method may be used for power transmission to completely eliminate the power line and avoid vibration and interference due to the power line. The specific implementation scheme is that the WPT technology is utilized to ensure stable and sufficient power supply of the service cabin, and the split design of the cargo cabin and the service cabin is realized; the wireless energy coupler can realize the split design of the load cabin and the service cabin, applies wireless energy transmission to charge the precision equipment in a weightless environment, and improves the precision degree of the precision equipment through space isolation.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (1)
1. The wireless energy coupler with the coaxial structure is characterized by comprising an outer magnetic ring (4) and an inner magnetic ring (5) which are coaxially arranged, wherein the outer magnetic ring (4) is sleeved outside the inner magnetic ring (5), the outer magnetic ring (4) and the inner magnetic ring (5) are respectively arranged into a circular ring shape by a plurality of magnetic stripes (41), a C-shaped magnetic core (42) is arranged inside the magnetic stripe (41), and an opening of the C-shaped magnetic core (42) of the outer magnetic ring (4) is opposite to an opening of the C-shaped magnetic core (42) of the inner magnetic ring (5); the coil comprises a first coil winding (2), a second coil winding (3), a transmitting end (6), a receiving end (7), a first coil winding (2), a second coil winding (3), a shell (1) made of metal materials, and a transmitting end (6), wherein the first coil winding (2) is wound on the inner wall of an outer magnetic coil (4) in a spiral mode, the second coil winding (3) is wound on the outer wall of an inner magnetic coil (5) in a spiral mode, the first coil winding (2) is connected with the transmitting end (6), the second coil winding (3) is connected with the receiving end (7), or the first coil winding (2) is connected with the receiving end (7), the second coil winding (3) is connected with the;
the width of a gap between the first coil winding (2) and the second coil winding (3) is 3-20 mm;
the interior of the inner magnetic ring (5) and the shell (1) enclose to form an inner cabin body (8);
the outer magnetic ring (4) is tightly attached to and wraps the first coil winding (2), and the inner magnetic ring (5) is tightly attached to and wraps the second coil winding (3);
the outer magnetic coil (4) and the inner magnetic coil (5) are arranged between the outer wall of the receiving end (7) and the outer wall of the transmitting end (6);
the wireless energy coupler with the coaxial structure is used for an aerospace instrument;
the C-shaped magnetic core (42) is integrally formed or assembled into a corresponding shape through magnetic stripes;
the shell (1) is made of aluminum alloy;
the material of the magnetic strip (41) is MnZn power ferrite material.
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| CN110266115A (en) * | 2019-06-28 | 2019-09-20 | 天津大学 | Downhole electronics non-contact charger based on rotating excitation field |
| CN110635573B (en) * | 2019-09-23 | 2021-02-19 | 重庆大学 | Sleeve pair-embedded electric field coupling mechanism and EC-WPT system formed by same |
| CN111146878A (en) * | 2020-01-20 | 2020-05-12 | 西安交通大学 | WPT coil coupling structure |
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| CN108780696A (en) * | 2016-09-23 | 2018-11-09 | 苹果公司 | Electromagnetic screen for Wireless power transmission system |
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| CN104201793B (en) * | 2014-09-16 | 2017-03-01 | 舟山市质量技术监督检测研究院 | A kind of self-conductance location type adjustable clearance non-contact type apparatus for transmitting electric energy |
| CN105790445B (en) * | 2014-12-22 | 2019-01-11 | 美律实业股份有限公司 | Radio transmitting device and the mechanical arm for using the device |
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| CN107154680A (en) * | 2017-05-27 | 2017-09-12 | 山东大学 | A kind of coupling coil charged applied to underwater wireless and core structure and system |
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