CN113793746B - Cross solenoid magnetic coupling mechanism with high offset performance - Google Patents
Cross solenoid magnetic coupling mechanism with high offset performance Download PDFInfo
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- CN113793746B CN113793746B CN202111156948.2A CN202111156948A CN113793746B CN 113793746 B CN113793746 B CN 113793746B CN 202111156948 A CN202111156948 A CN 202111156948A CN 113793746 B CN113793746 B CN 113793746B
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- conductive sheet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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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
-
- 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
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a cross solenoid magnetic coupling mechanism with high offset performance, which relates to the field of wireless electric energy transmission, and comprises a transmitting structure and a receiving structure which are oppositely arranged, wherein the receiving structure comprises a receiving magnetic conductive sheet and two receiving coils wound at the middle part of the receiving structure in a cross orthogonal mode, the short side and the long side of the transmitting magnetic conductive sheet in the transmitting structure are not smaller than the side length of the receiving magnetic conductive sheet, the first transmitting coil is wound at the middle part of the transmitting magnetic conductive sheet along the long side direction, the second transmitting coil and the third transmitting coil are wound at the two ends of the transmitting magnetic conductive sheet along the short side direction, and the fourth transmitting coil is wound at the middle part of the transmitting magnetic conductive sheet along the short side direction.
Description
Technical Field
The invention relates to the field of wireless power transmission, in particular to a cross solenoid magnetic coupling mechanism with high offset performance.
Background
In recent years, the wireless power transmission technology has been rapidly developed due to the advantages of safety, environmental protection, high reliability and the like, and gradually enters various industries. Currently, wireless power transmission technology has been applied to the fields of electric automobiles, consumer portable electronic products, medical implant equipment, and the like, and products adopting the wireless power transmission technology exhibit "blowout" development.
However, the wireless power transmission technology has a great disadvantage, i.e., a poor degree of spatial freedom, compared to the conventional wired charging technology. When the relative position between the magnetic coupling mechanisms of the wireless power transmission system is deviated, the transmission efficiency and the transmission power of the system can be greatly affected. When the offset reaches a certain distance, the system cannot work normally, and the development of the wireless power transmission technology is greatly limited by the characteristic.
At present, the research of students mainly improves the anti-offset performance of the system through two aspects of a magnetic coupling mechanism and a compensation network. Among the magnetic coupling mechanisms, there are relatively many studies on the related aspects, and the magnetic coupling mechanisms with strong resistance to offset include: DD coils, DDQ coils, BP coils, circularly asymmetric coils, tetrahedral coils, three-dimensional orthogonal ferrite coils, and other three-dimensional coil structures, and the like. However, these coils have respective disadvantages, such as the coupling zero problem of the DD coil, the dual inverter driving requirement of the DDQ coil and the BP coil, and the offset resistance of the three-dimensional coil structure is generally poor. In addition, the coil structure has a common disadvantage that mutual inductance between the transmitting and receiving coils fluctuates to some extent in case of offset, because the transmitting coil cannot provide a uniform magnetic field.
Patent publication 108962571A proposes a cross-shaped planar solenoid type magnetic coupling mechanism which improves the anti-offset performance compared to the conventional coil described above, and is mainly characterized in that: as the offset between the transmit and receive coils increases, the coupling coefficient between the coils decreases more slowly. However, due to the symmetry of the magnetic coupling structure mentioned in the document, when the transceiver coils are offset, the coupling between the transceiver coils is rapidly reduced, which affects the normal operation of the system, so that the anti-offset capability between the transceiver coils is still not ideal.
Disclosure of Invention
The present inventors have proposed a cross solenoid magnetic coupling mechanism with high offset performance, and the technical scheme of the present invention is as follows:
a cross solenoid magnetic coupling mechanism with high offset performance comprises a transmitting structure and a receiving structure which are oppositely arranged;
the receiving structure comprises a receiving magnetic conductive sheet and two receiving coils, the receiving magnetic conductive sheet is in a square structure, and the first receiving coil and the second receiving coil are wound in the middle of the receiving magnetic conductive sheet in a cross orthogonal mode;
the transmitting structure comprises a transmitting magnetic conductive sheet and four transmitting coils, the transmitting magnetic conductive sheet is of a rectangular structure, and the short side and the long side of the transmitting magnetic conductive sheet are not smaller than the side length of the receiving magnetic conductive sheet; the first transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the long side direction of the transmitting magnetic conductive sheet, the second transmitting coil and the third transmitting coil are wound at two ends of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet respectively, and the fourth transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet.
The further technical scheme is that the short side w of the transmitting magnetic conductive sheet and the side length a of the receiving magnetic conductive sheet meet the following conditions: a is more than or equal to 0.8w and less than or equal to w.
The further technical proposal is that the length a between the long side l of the transmitting magnetic conductive sheet and the side length a of the receiving magnetic conductive sheet is less than or equal to l and less than or equal to 3a.
The further technical scheme is that the turns of the second transmitting coil and the third transmitting coil are equal, the turns of the first transmitting coil are twice the turns of the second transmitting coil, and the turns of the fourth transmitting coil are far smaller than the turns of the second transmitting coil.
The further technical scheme is that any two transmitting coils in the transmitting structure are mutually independent or connected in series.
The further technical proposal is that two receiving coils in the receiving structure are mutually independent or connected in series.
The beneficial technical effects of the invention are as follows:
the application discloses a cross solenoid magnetic coupling mechanism with high offset performance, this cross solenoid magnetic coupling mechanism has the invariable mutual inductance region of broad, can provide bigger and more stable working area for receiving structure, has high offset performance, can be used to the occasion that the anti offset performance requirement is higher.
Drawings
Fig. 1 is a schematic structural view of a cross solenoid magnetic coupling mechanism of the present application.
FIG. 2 is a schematic illustration of the magnetic induction distribution curve at 10cm above the transmitting structure with only the transmitting structure.
Fig. 3 is a graph of mutual inductance between transmit-receive structures as a function of offset distance for three schemes with different numbers of turns of the fourth transmit coil.
Fig. 4 is a graph of the coupling variation between the magnetic coupling structure of the present application and the transceiver structure of the prior art magnetic coupling mechanism using the same dimensional parameters.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
The application discloses a cross solenoid magnetic coupling mechanism with high offset performance, please refer to fig. 1, which comprises a transmitting structure 1 and a receiving structure 2 which are oppositely arranged.
The transmitting structure 1 comprises a transmitting magnetic conductive sheet 11 and four transmitting coils, wherein the transmitting magnetic conductive sheet 11 is in a rectangular structure, and the long side is l, and the short side is w. The first transmitting coil 12 is wound in the middle of the transmitting magnetic conductive sheet 11 along the long side direction of the transmitting magnetic conductive sheet 11, the second transmitting coil 13 and the third transmitting coil 14 are wound at both ends of the transmitting magnetic conductive sheet 11 along the short side direction of the transmitting magnetic conductive sheet 11, respectively, and the fourth transmitting coil 15 is wound in the middle of the transmitting magnetic conductive sheet 11 along the short side direction of the transmitting magnetic conductive sheet 11. Any two transmitting coils in the transmitting structure are mutually independent or connected in series.
The number of turns of the second transmitting coil 13 and the third transmitting coil 14 is equal to n, and the number of turns m of the first transmitting coil 12 is twice the number of turns n of the second transmitting coil 13, i.e. m= 2*n. The number of turns p of the fourth transmitting coil 15 is much smaller than the number of turns n of the second transmitting coil 13, i.e. 1.ltoreq.p < n, to a much smaller extent than can be configured as desired.
The receiving structure 2 comprises a receiving magnetic conductive sheet 21 and two receiving coils, wherein the receiving magnetic conductive sheet 21 is in a square structure, and the side length of the receiving magnetic conductive sheet is a. The first receiving coil 22 and the second receiving coil 23 are wound in the middle of the receiving magnetic conductive sheet in a cross orthogonal manner. The two receiving coils 22 and 23 in the receiving structure are independent of each other or connected in series.
The transmitting magnetic conductive sheet 11 and the receiving magnetic conductive sheet 21 are arranged at parallel intervals, the two magnetic conductive sheets can be realized by ferrite magnetic conductive sheets, and the distance between the transmitting and receiving structures can be properly adjusted according to the design requirements of device power and efficiency when the actual system is designed, and the size of the distance can influence the coupling size and the size of the constant magnetic flux area. Both the short side w and the long side l of the transmitting magnetic conductive sheet are not smaller than the side length a of the receiving magnetic conductive sheet. Further, the short side w of the transmitting magnetic conductive sheet and the side length a of the receiving magnetic conductive sheet satisfy: a is more than or equal to 0.8w and less than or equal to w. The length a between the long side l of the transmitting magnetic conductive sheet and the side length a of the receiving magnetic conductive sheet is less than or equal to l and less than or equal to 3a.
The transmitting structure and the receiving structure with different sizes are adopted in the application, and the winding positions of the coils on the transmitting structure are correspondingly designed, so that the transmitting coil can generate a wider constant magnetic flux area. When the receiving structure is not placed, as shown in fig. 2, the magnetic induction B represented by the vertical axis has a magnetic induction distribution of 290-310uT in the range of 5cm-53cm represented by the horizontal axis at 10cm above the transmitting structure, whereby it is apparent that the transmitting structure produces a wider constant magnetic flux region. When the receiving structure exists, the receiving coil and the receiving magnetic conductive sheet can have a collecting effect on the magnetic field, so that the energy received by the receiving structure can be more stable.
To illustrate the effectiveness of the structure of the present application, the present application provides an example in which the number of turns p of the fourth transmitting coil 15 in the first scheme is 0, the number of turns p of the fourth transmitting coil 15 in the second scheme is 5, and the number of turns p of the fourth transmitting coil 15 in the third scheme is 1. Except for this, the remaining conditions for the three schemes were all the same: (1) The short side w of the transmitting magnetic conductive sheet 11 is equal to the side length a of the receiving magnetic conductive sheet 21 by w=a=20cm; (2) The long side l of the transmitting magnetic conductive sheet 11 is three times the side length a of the receiving magnetic conductive sheet 21, and l= 3*a =60 cm; (3) The number of turns of the second transmitting coil 13 and the third transmitting coil 14 is 5; (4) the number of turns of the first transmitting coil 12 is 10; (5) the number of turns of both receiving coils 22 and 23 is 10; (6) The transmission distance between the receiving structure and the transmitting structure is 10cm. The three schemes are tested respectively, the receiving structure is shifted along the long side direction of the transmitting structure, the change curve graph of mutual inductance between the receiving and transmitting structures along with the shifting distance in the three schemes is shown in figure 3, and as can be seen from figure 3, the scheme I can obtain a constant mutual inductance area with the shifting range (-5 cm-45 cm) of 50cm, but a certain mutual inductance drop exists in the middle part (20 cm); the scheme II can obtain a larger mutual inductance value, but has no better uniform magnetic field range; scheme three can obtain the constant mutual inductance area of (-5 cm-45 cm) 50cm offset range, and keep constant in the middle part (20 cm), has even magnetic field distribution, has demonstrated the effectiveness that this kind of structure of this application and turns match design produced.
The effectiveness of this symmetrical structure is also illustrated by the present application with respect to the patent publication 108962571a (hereinafter referred to as the prior art) by the following example. Based on the structure of the application, the following parameters are set: (1) The short side w of the transmitting magnetic conductive sheet 11 is equal to the side length a of the receiving magnetic conductive sheet 21 by w=a=20cm; (2) The long side l of the transmitting magnetic conductive sheet 11 is three times the side length a of the receiving magnetic conductive sheet 21, with l=1.5×a=30 cm; (3) The number of turns of the second transmitting coil 13 and the third transmitting coil 14 is 5; (4) the number of turns of the first transmitting coil 12 is 10; (5) the number of turns of both receiving coils 22 and 23 is 10; (6) The transmission distance between the receiving structure and the transmitting structure is 10cm.
In order to ensure data comparability, the structure based on the prior art is subjected to fine adjustment, and parameters of the structure are set to be similar to the parameters in the application so as to compare at the same latitude, and specifically: the secondary side magnetic core 3 in the prior art is set to be 30cm by 20cm, the primary side magnetic core is set to be 20cm by 20cm, the number of turns of the two secondary side coils is 10, the number of turns of the two primary side coils is 10, and the distance between the receiving coil and the transmitting coil is 10cm.
According to the method, the prior art and the application are respectively tested, the receiving structure is offset along the long side direction of the transmitting structure, the coupling change curve between the receiving structure and the transmitting structure is shown as a graph in fig. 4, and compared with the prior art, the method can obtain a constant magnetic flux area of-5 cm-15 cm, which is 20cm in total, and the attenuation of the coupling coefficient between the receiving coil and the transmitting coil is relatively slow in an improvement scheme beyond the area, namely, the receiving structure can be offset randomly in a wider constant magnetic flux area based on the structure of the method, the coupling between the receiving structure and the transmitting structure is still good, so that the working state of the system is basically maintained unchanged, and the anti-offset performance is better.
If the constant magnetic flux region is to be further enlarged, the long side length l of the transmitting coil long magnetizer can be further increased, but this increases the system leakage magnetic flux and reduces the system efficiency, so the long side length l of the transmitting coil magnetizer and the side length a of the receiving coil magnetizer are constrained.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present invention are deemed to be included within the scope of the present invention.
Claims (6)
1. A cross solenoid magnetic coupling mechanism with high offset performance, characterized in that the cross solenoid magnetic coupling mechanism comprises a transmitting structure and a receiving structure which are oppositely arranged;
the receiving structure comprises a receiving magnetic conductive sheet and two receiving coils, wherein the receiving magnetic conductive sheet is of a square structure, and the first receiving coil and the second receiving coil are wound in the middle of the receiving magnetic conductive sheet in a cross orthogonal mode;
the transmitting structure comprises a transmitting magnetic conductive sheet and four transmitting coils, the transmitting magnetic conductive sheet is of a rectangular structure, and the short side and the long side of the transmitting magnetic conductive sheet are not smaller than the side length of the receiving magnetic conductive sheet; the first transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the long side direction of the transmitting magnetic conductive sheet, the second transmitting coil and the third transmitting coil are wound at two ends of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet, and the fourth transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet.
2. The cross solenoid magnetic coupling mechanism according to claim 1, wherein between a short side w of the transmitting magnetic conductive sheet and a side a of the receiving magnetic conductive sheet, the following are satisfied: a is more than or equal to 0.8w and less than or equal to w.
3. The cross solenoid magnetic coupling mechanism of claim 1, wherein a.ltoreq.l.ltoreq.3a is satisfied between a long side l of the transmitting magnetic conductive sheet and a side a of the receiving magnetic conductive sheet.
4. The cross solenoid magnetic coupling mechanism of claim 1, wherein the number of turns of the second transmit coil and the third transmit coil are equal, the number of turns of the first transmit coil being twice the number of turns of the second transmit coil, the number of turns of the fourth transmit coil being substantially less than the number of turns of the second transmit coil.
5. The cross solenoid magnetic coupling mechanism of any of claims 1-4, wherein any two of the transmit coils in the transmit configuration are independent of each other or are connected in series.
6. The cross solenoid magnetic coupling mechanism of any of claims 1 to 4, wherein two receiving coils in the receiving structure are independent of each other or connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111156948.2A CN113793746B (en) | 2021-09-30 | 2021-09-30 | Cross solenoid magnetic coupling mechanism with high offset performance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111156948.2A CN113793746B (en) | 2021-09-30 | 2021-09-30 | Cross solenoid magnetic coupling mechanism with high offset performance |
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| Publication Number | Publication Date |
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| CN113793746A CN113793746A (en) | 2021-12-14 |
| CN113793746B true CN113793746B (en) | 2023-07-18 |
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| CN202111156948.2A Active CN113793746B (en) | 2021-09-30 | 2021-09-30 | Cross solenoid magnetic coupling mechanism with high offset performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114974853B (en) * | 2022-05-05 | 2023-09-15 | 重庆大学 | Square overlapped wireless power transmission coupling coil structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108962571A (en) * | 2018-07-23 | 2018-12-07 | 哈尔滨工业大学 | Cross type plane thread tubular type magnetic coupling arrangement |
| CN112912271A (en) * | 2018-05-29 | 2021-06-04 | 多伦多大学理事会 | Wireless power transmission device, method and system |
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2021
- 2021-09-30 CN CN202111156948.2A patent/CN113793746B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112912271A (en) * | 2018-05-29 | 2021-06-04 | 多伦多大学理事会 | Wireless power transmission device, method and system |
| CN108962571A (en) * | 2018-07-23 | 2018-12-07 | 哈尔滨工业大学 | Cross type plane thread tubular type magnetic coupling arrangement |
Non-Patent Citations (1)
| Title |
|---|
| 基于螺线管线圈的无线电能传输系统的研究与优化;李帅波、梁丹丹、王立强、尹伟、张燕;《新疆农机化》(第1期);11-13、22 * |
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| CN113793746A (en) | 2021-12-14 |
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