CN114334437B - Winding method of energy transmitting coil and multi-stage guide rail wireless energy transmission system - Google Patents
Winding method of energy transmitting coil and multi-stage guide rail wireless energy transmission system Download PDFInfo
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- CN114334437B CN114334437B CN202210017721.8A CN202210017721A CN114334437B CN 114334437 B CN114334437 B CN 114334437B CN 202210017721 A CN202210017721 A CN 202210017721A CN 114334437 B CN114334437 B CN 114334437B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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Abstract
The invention discloses a winding method of an energy transmitting coil and a multi-stage guide rail wireless energy transmission system, which comprises the following steps: s1, determining a size parameter of a main coil according to an application scene, and winding the main coil into a rectangular main coil on a first plane according to a first winding direction; s2: sequentially winding N rectangular compensation coils in the middle blank area of the main coil along the length direction of the main coil according to the first winding direction; s3: and a magnetic core is arranged below the main coil between the left and right end folding sections, and the main coil and the compensation coil at the corresponding positions of the left and right end folding sections are folded to the lower surface of the magnetic core. When the transmitting device is used for forming the transmitting guide rail, the ends of the two adjacent energy transmitting coils can form a coil similar to a rectangle, so that the directions of the two magnetic fields are uniform, the reverse magnetic field is weakened, the mutual inductance value of the junction area of the two adjacent energy transmitting coils is larger, and the problem of mutual inductance fading caused by the left end and the right end of the energy transmitting coils is effectively solved.
Description
Technical Field
The invention relates to a wireless energy transmission technology, in particular to a winding method of an energy transmitting coil and a multi-stage guide rail wireless energy transmission system.
Background
The dynamic wireless charging system is a wireless energy transmission system capable of wirelessly charging electric equipment in the movement process of the electric equipment, and the electric automobile wireless charging system is a typical application.
In dynamic charging systems, two magnetic coupling schemes are typically used. One is a long rail type structure, and the other is a sectional rail type structure. The long rail structure is constituted by a coil which is much longer in the direction of movement of the pick-up end than the pick-up coil. In contrast, the short rail structure consists of a series of coils that are the same size as the pick-up coils. The long guide rail structure is researched mainly based on two reasons of convenience for supplying power to a plurality of electric automobiles simultaneously and less ground power supply equipment quantity requirements. However, the long rail structure necessarily results in a very small coupling coefficient between the launch end and the pick-up end. Long-distance transmitting-end coils must also produce significant parasitic resistances. The two fatal disadvantages lead to the inefficiency of the system and serious electromagnetic interference problems. Instead, the segmented rail structure lends itself to providing only the portion actually coupled with the pick-up coil, which helps to improve energy transfer efficiency and avoid electromagnetic field radiation from the uncoupled track portion. Thus, segmented rail structures are commonly employed as electromagnetic coupling schemes for dynamic wireless charging systems.
Although dynamic wireless charging systems employing segmented rail structures have many advantages, there are still problems and challenges to be addressed. Because the coupling degree between the pick-up end and the transmitting end changes along with the movement of the pick-up end and even falls to zero, when the pick-up end moves along the track, the output power of the pick-up end can fluctuate and fall, so that the pick-up coil is uneven in electrode taking, and the use of a load is seriously affected.
Disclosure of Invention
In order to solve the technical problems, the invention firstly provides a winding method of an energy transmitting coil, which can weaken fluctuation and drop of energy transmission and relieve the influence of end current on mutual inductance. Based on the winding method, the invention also provides a multistage guide rail wireless energy transmission system with stable transmission and higher coupling coefficient.
In order to achieve the above purpose, the specific technical scheme adopted by the invention is as follows:
the winding method of the energy transmitting coil is characterized by comprising the following steps of:
s1, determining a size parameter of a main coil according to an application scene, and winding the main coil into a rectangular main coil on a first plane according to a first winding direction; the size parameters comprise the length and the width of the main coil, the length and the width of a blank area in the middle of the main coil and the length of the turnover sections at the left end and the right end of the main coil;
s2: determining the size parameters and the number N of the compensation coils according to the length and the width of the blank area in the middle of the main coil, wherein N is more than or equal to 2, and then, the compensation coils are arranged in the middle of the main coil
Sequentially winding N rectangular compensation coils in the blank area along the length direction of the main coil according to the first winding direction;
s3: and according to the lengths of the turning sections at the left end and the right end of the main coil, a magnetic core is arranged below the main coil between the turning sections at the left end and the right end, and the main coil and the compensation coil at the corresponding positions of the turning sections at the left end and the right end are turned to the lower surface of the magnetic core.
Further, in step S2, the N rectangular compensating coils have the same number of turns and are wound from outside to inside.
Further, in step S2, the outermost coils of the two adjacent compensation coils are abutted against each other.
Further, in step S3, the lengths of the folded sections of the left and right ends of the main coil are the same, and the lengths of the folded sections of the two compensation coils at the left and right ends are also the same.
Further, in step S3, the two compensation coils at the left and right ends are in a vertically symmetrical relationship with respect to the compensation section above the magnetic core and the turnover section below the magnetic core.
Further, the main coil and the compensation coil are formed by continuously winding a wire.
Further, the main coil is wound from outside to inside, the end of the innermost turn of the main coil extends from the end of the main coil to the inner blank area, and the compensation coils are wound in sequence on the first plane.
The invention also discloses a multi-stage guide rail wireless energy transmission system, which is characterized by comprising a plurality of sections of energy transmitting coils wound by the winding method, wherein the sections of energy transmitting coils are sequentially arranged in the length direction, and each section of energy transmitting coils is connected with a wireless energy transmitting circuit.
Further, two adjacent energy transmitting coils are abutted against each other on the same plane.
Further, the wireless energy transmitting circuit is provided with a direct current power supply, an inverter circuit and a resonance capacitor connected with the energy transmitting coil in series or in parallel.
Compared with the prior art, the invention has the remarkable effects that:
1. when the energy transmitting coils wound by the winding method form a multi-guide rail wireless energy transmission system, the end parts of two adjacent energy transmitting coils can form a coil similar to a rectangle, so that the directions of magnetic fields of the two adjacent energy transmitting coils are uniform, the reverse magnetic field is weakened, the mutual inductance value in the junction area of the two adjacent energy transmitting coils is larger, and the problem of mutual inductance fading caused by the left end and the right end of the energy transmitting coils is effectively solved;
2. because the invention winds a plurality of compensation coils in the main coil according to the same winding direction, when the dynamic wireless energy transmission is carried out towards the pick-up end, the invention can be suitable for a scene with a longer energy transmission section of the main coil under the action of the compensation coils, and counteracts the power consumption caused by the parasitic resistance of the main coil, and has the advantages of larger coupling coefficient, higher and more stable wireless energy transmission efficiency.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a winding method according to a first embodiment;
FIG. 2 is a layered relationship diagram of a first embodiment;
FIG. 3 is a schematic diagram of the winding direction of the energy transmitting coil according to the first embodiment;
FIG. 4 is a schematic diagram of a multi-rail wireless energy transfer system according to the first embodiment;
the drawing is marked: the device comprises a 1-main coil, a 2-main coil energy transmission section, a 3-main coil turnover section, a 4-magnetic core, a 5-compensation coil and a 6-compensation coil turnover section.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Fig. 1 shows a first embodiment of the invention: a winding method of an energy transmitting coil, comprising the steps of:
s1, determining a size parameter of a main coil 1 according to an application scene, and winding the main coil 1 into a rectangular main coil 1 on a first plane according to a first winding direction; the size parameters comprise the length and the width of the main coil 1, the length and the width of a blank area in the middle of the main coil 1 (namely the length of the main coil energy transmission section 2) and the length of the turnover sections 3 at the left end and the right end of the main coil 1;
s2: determining the size parameters and the number N, N is more than or equal to 2 of the compensation coils 5 according to the length and the width of the middle blank area of the main coil 1, and then sequentially winding N rectangular compensation coils 5 in the middle blank area of the main coil 1 and along the length direction of the main coil 1 according to the first winding direction;
s3: according to the lengths of the left and right end folding sections 3 of the main coil 1, a magnetic core 4 is arranged below the main coil 1 between the left and right end folding sections 3, and the main coil (namely the main coil folding section 3) and the compensation coil (namely the compensation coil folding section 6) at the corresponding positions of the left and right end folding sections 3 are folded to the lower surface of the magnetic core.
The seven views in fig. 1 correspond to three steps of winding the energy transmitting coil, wherein view (a) is a state diagram of a certain time point when step S1 is implemented, view (b) and view (c) are state diagrams of a certain two successive time points when step S2 is implemented, and view (d) to view (g) are state diagrams of a certain four successive time points when step S3 is implemented.
In the specific implementation, taking five compensation coils as an example, the five rectangular compensation coils 5 have the same number of turns and are wound from outside to inside. Preferably, to ensure that the percentage of mutual inductance drop is small when the pick-up coil on the pick-up end is moved over a single energy transmission coil, the number of turns of the primary coil 1 is at least twice that of either of the compensating coil turns 5.
As shown in views (b) to (c), the outermost turns of the adjacent two compensation coils 5 abut against each other. The advantage of winding the compensation coil 5 in this way is that when the pick-up end needs to perform wireless power transmission for a long time at a certain position, the mutual inductance value of the area can be enhanced in a targeted manner by the compensation coil 5, and the continuous arrangement of the compensation coil 5 clearly provides a wider optional range; meanwhile, when the same mutual inductance value is reached, the self-inductance value of the energy transmitting coil can be obviously reduced by continuously arranging the compensating coils 5, so that the power loss of energy transmission is reduced.
Referring to the view (g), in order to ensure the stability of the wireless energy transmission as much as possible, and to improve the mutual inductance of the junction area of the two adjacent energy transmitting coils when forming the multi-rail wireless energy transmission system, in step S3, the lengths of the folded sections 3 at the left and right ends of the main coil are the same, and the lengths of the folded sections 6 of the two compensating coils at the left and right ends are the same and smaller than the length of the folded section of the main coil. Specifically, in step S3, the two compensation coils at the left and right ends are in a vertically symmetrical relationship with respect to the compensation section above the magnetic core and the turnover section 6 below the magnetic core 4. Meanwhile, as is obvious from the view (f) and the view (g), the edge profile of the energy transmitting coil is exactly tangential to the edge profile of the magnetic core 4, so that the structure is more compact, and the installation and the fixation are more convenient when the multi-guide rail wireless energy transmission system is formed.
Fig. 2 shows a layered relationship of an energy emitting coil wound by the winding method according to this embodiment, and as can be seen from fig. 2, the main coil and the compensation coil are continuously wound by one wire. The main coil is wound from outside to inside, the tail end of the innermost turn of the main coil extends from the end of the main coil to the inner blank area, and the compensation coils are wound on the first plane in sequence. It should be noted that, no matter the main coil 1 or the compensating coils 5 at the left and right ends, the part turned inwards can be far away from the receiving coil, and a reserved space for sandwiching the magnetic core 4 can be formed between the main coil energy transmission section 2 and the compensating coil compensating section on the upper part, in the wireless energy transmission process, the section of the energy transmitting coil which mainly realizes power transmission can better send energy to one side of the pickup coil, and the part coils (namely the main coil turning section 3 and the compensating coil turning section 6) of which the left and right ends of the energy transmitting coil easily cause mutual inductance falling can be shielded through the magnetic core 4, thereby reducing the influence on power transmission.
The winding direction of the energy emitting coil is shown in fig. 3, wherein the solid line represents a part of the energy emitting coil (the main coil energy transmission section 2, the left and right compensating coil compensating sections and all compensating coils between the left and right compensating coils 5) at the upper end of the magnetic core 4, the dotted line represents a part of the energy emitting coil (i.e., the main coil turnover section 3 and the compensating coil turnover section 6) at the lower end of the magnetic core 4, and as can be seen from fig. 3, a plurality of compensating coils 5 are connected in series with the main coil 1.
In combination with the above description of the winding method of the energy transmitting coil, the first embodiment also discloses a multi-stage guide rail wireless energy transmission system, which comprises a plurality of sections of energy transmitting coils wound by the winding method, wherein the plurality of sections of energy transmitting coils are sequentially arranged according to the length direction, and each section of energy transmitting coils is connected with a wireless energy transmitting circuit.
Taking two sections of energy emission lines in fig. 4 as an example, when the pick-up end just enters an energy emission area, the mutual inductance value gradually rises along with the approach of the distance, the transformation is relatively stable, no fluctuation occurs, the mutual inductance slightly falls when the pick-up coil moves to the transition area of the two sections of energy emission coils, but the mutual inductance is far smaller than the falling depth in the prior art, and the energy gradually decreases when the pick-up coil finally slowly leaves the wireless energy transmission area.
The difference between the second embodiment and the first embodiment is only that the number of turns of the compensation coil is different, in the second embodiment, the first compensation coil, the second compensation coil, the third compensation coil, the fourth compensation coil and the fifth compensation coil are sequentially wound along the length direction of the main coil, wherein the number of turns of the first compensation coil and the fifth compensation coil at two ends, and the number of turns of the third compensation coil at the middle position are larger than those of the second compensation coil and the fourth compensation coil.
In this embodiment, since there is also one drop in the mutual inductance at the junction area of two adjacent compensation coils, the applicant controls the mutual inductance drop range by adjusting the number of turns of the compensation coils. Because of the bilateral symmetry of the individual transmitter coils, only the third and fourth compensation coils and the junction region of the fourth and fifth compensation coils are evaluated here. The number of turns of the fourth compensation coil is smaller than that of the third compensation coil, so that the mutual inductance value of the initial position of the receiving coil is improved; likewise, the number of turns of the fourth compensation coil is smaller than that of the fifth compensation coil, so that the mutual inductance value of the receiving coil moving to the middle area of two adjacent transmitting coils is improved; too small a fourth coil will also reduce the mutual inductance value of the third and fourth compensation coils and the junction area of the fourth and fifth compensation coils; the smaller the number of turns of all the compensation coils, the smaller the mutual inductance drop percentage, and when no compensation coil exists, the mutual inductance of the whole transmitting coil area is uniform, but the mutual inductance of the middle area of two adjacent transmitting coils is lower than that of the middle area of the two adjacent transmitting coils when the compensation coils exist. Therefore, the number of turns of the third and fifth compensation coils may be substantially the same, while the number of turns of the fourth compensation coil may be suitably 2-3 turns less than the number of turns of the third or fifth compensation coil, and the number of turns of the main coil should be more than 50% more than the number of turns of the third and fifth compensation coils to ensure that the percentage of mutual inductance drop is small when the receiving coil moves over a single transmitting coil.
In summary, when the energy transmitting coils wound by the winding method of the invention form a multi-guide rail wireless energy transmission system, the end parts of two adjacent energy transmitting coils can form a coil similar to a rectangle, so that the directions of magnetic fields of the two adjacent energy transmitting coils are uniform, the reverse magnetic field is weakened, and the mutual inductance value in the junction area of the two adjacent energy transmitting coils is larger, thereby effectively overcoming the mutual inductance fading problem caused by the left end and the right end of the energy transmitting coils; because the invention winds a plurality of compensation coils in the main coil according to the same winding direction, when the dynamic wireless energy transmission is carried out towards the pick-up end, the invention can be suitable for a scene with a longer energy transmission section of the main coil under the action of the compensation coils, and counteracts the power consumption caused by the parasitic resistance of the main coil, and has the advantages of larger coupling coefficient, higher and more stable wireless energy transmission efficiency.
Claims (8)
1. A winding method of an energy transmitting coil, characterized by comprising the following steps:
s1, determining a size parameter of a main coil according to an application scene, and winding the main coil into a rectangular main coil on a first plane according to a first winding direction; the size parameters comprise the length and the width of the main coil, the length and the width of a blank area in the middle of the main coil and the length of the turnover sections at the left end and the right end of the main coil;
s2: determining the size parameters and the number N, N is more than or equal to 2 of the compensation coils according to the length and the width of the middle blank area of the main coil, sequentially winding N rectangular compensation coils in the middle blank area of the main coil and along the length direction of the main coil according to the first winding direction, and sequentially winding a first compensation coil, a second compensation coil, a third compensation coil, a fourth compensation coil and a fifth compensation coil along the length direction of the main coil, wherein the number of turns of the first compensation coil and the fifth compensation coil at two ends and the number of turns of the third compensation coil at the middle position are larger than those of the second compensation coil and the fourth compensation coil;
s3: and according to the lengths of the turning sections at the left end and the right end of the main coil, a magnetic core is arranged below the main coil between the turning sections at the left end and the right end, and the main coil and the compensation coil at the corresponding positions of the turning sections at the left end and the right end are turned to the lower surface of the magnetic core.
2. The method of winding an energy transmitting coil according to claim 1, wherein in step S3, lengths of the folded sections of the left and right ends of the main coil are the same, and lengths of the folded sections of the two compensation coils at the left and right ends are the same.
3. The method of winding an energy transmitting coil according to claim 1, wherein in step S3, two compensation coils at both left and right ends are in a vertically symmetrical relationship between a compensation section above the magnetic core and a turnover section below the magnetic core.
4. The method of winding an energy transmitting coil as set forth in claim 1, wherein the main coil and the compensation coil are continuously wound from one wire.
5. The method of winding an energy transmitting coil as set forth in claim 4, wherein the main coil is wound from outside to inside with the end of the innermost turn extending from the end of the main coil to the inner void area, and the compensation coils are wound sequentially on the first plane.
6. A multi-stage guide rail wireless energy transmission system, which is characterized by comprising a plurality of sections of energy transmitting coils wound by the winding method according to any one of claims 1-5, wherein the plurality of sections of energy transmitting coils are sequentially arranged according to the length direction, and each section of energy transmitting coils is connected with a wireless energy transmitting circuit.
7. The multi-stage guideway wireless energy transfer system of claim 6, wherein two adjacent energy transmitting coils abut each other in the same plane.
8. The multi-stage guideway wireless energy transfer system according to claim 6 or 7, wherein a direct current power supply, an inverter circuit, and a resonance capacitor connected in series or parallel with the energy transmitting coil are provided in the wireless energy transmitting circuit.
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| CN202210017721.8A CN114334437B (en) | 2022-01-07 | 2022-01-07 | Winding method of energy transmitting coil and multi-stage guide rail wireless energy transmission system |
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| CN202210017721.8A CN114334437B (en) | 2022-01-07 | 2022-01-07 | Winding method of energy transmitting coil and multi-stage guide rail wireless energy transmission system |
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| CN104810933B (en) * | 2015-04-30 | 2017-09-12 | 重庆大学 | The osmosis type guide rail structure powered for electric automobile dynamic radio |
| WO2018031767A1 (en) * | 2016-08-11 | 2018-02-15 | Evatran Group, Inc. | Inductive coupling gap compensation |
| US20200021144A1 (en) * | 2018-07-16 | 2020-01-16 | Witricity Corporation | Method and system for reducing magnetic field emissions from double-d couplers |
| CN112350459B (en) * | 2020-12-03 | 2022-08-02 | 国网江苏省电力有限公司 | Anti-offset guide rail type dynamic wireless charging system and position correction method thereof |
| CN112564301A (en) * | 2020-12-09 | 2021-03-26 | 国网江苏省电力有限公司 | Cross coupling suppression structure and method in guide rail type wireless power transmission system |
| CN113270948B (en) * | 2021-05-26 | 2022-09-23 | 重庆大学 | Dynamic wireless charging system for inhibiting power fluctuation and parameter design method thereof |
| CN214674564U (en) * | 2021-06-09 | 2021-11-09 | 重庆前卫无线电能传输研究院有限公司 | Wireless energy emission guide rail and multi-guide-rail wireless energy transmission system |
| CN113258689B (en) * | 2021-06-09 | 2023-03-28 | 重庆前卫无线电能传输研究院有限公司 | Wireless energy transmitting device and multi-guide-rail wireless energy transmission system |
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