CN115241989A - Electric energy wireless direction-changing transmission method based on magnetic resonance coupling technology - Google Patents

Electric energy wireless direction-changing transmission method based on magnetic resonance coupling technology Download PDF

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CN115241989A
CN115241989A CN202210967429.2A CN202210967429A CN115241989A CN 115241989 A CN115241989 A CN 115241989A CN 202210967429 A CN202210967429 A CN 202210967429A CN 115241989 A CN115241989 A CN 115241989A
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coil
steering
optimizing
receiving
optimized
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王昭淇
强浩
陈则璋
牛辉
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Changzhou University
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Changzhou University
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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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • 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
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • 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

Abstract

The invention relates to the technical field of wireless power transmission, in particular to a wireless power direction-changing transmission method based on a magnetic resonance coupling technology, which comprises the steps of constructing a resonant circuit of a transmitting coil, a receiving coil and an optimized coil circuit, wherein the optimized coil comprises the following components: the same-direction optimizing coil and the steering optimizing coil; the mutual inductance values among the transmitting coil, the receiving coil, the equidirectional optimized coil and the steering optimized coil are calculated by using a magnetic coupling formula through setting parameters of the equidirectional optimized coil, the steering optimized coil and the transmitting coil, the load power, the current of the receiving coil and the flux linkage of the receiving coil are obtained by combining with kirchhoff's law, and the maximum transmission efficiency value is calculated. In a special environment with narrow space and complicated energy transmission path, the wireless power transmission mode based on coaxial equidirectional transmission and the optimization measures thereof can not meet the power transmission requirement, and the power transmission is carried out through a system capable of realizing wireless direction-changing transmission of power, so that the application of the magnetic resonance coupling technology is wider.

Description

Electric energy wireless direction-changing transmission method based on magnetic resonance coupling technology
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a wireless power direction-changing transmission method based on a magnetic resonance coupling technology.
Background
The wireless power transmission technology has the advantages of safety, flexibility and universality, and can effectively avoid the problems of instability of electric contact, limitation of movement of electric equipment and the like. With the improvement of the pursuit of quality such as portability and high efficiency of electronic equipment and the emphasis on the safety of electricity for industrial production, wireless charging equipment is rapidly developed and widely applied to life and production. The basic principle of wireless charging transmission is different, and the wireless charging transmission method is divided into three typical wireless charging technologies, which are respectively as follows: the short-distance transmission technology based on electromagnetic induction, the medium-distance transmission technology based on magnetic resonance coupling and the long-distance transmission technology based on microwave.
The magnetic resonance coupling technology utilizes electromagnetic resonance caused when the frequency of the receiving coil is consistent with that of the transmitting coil to generate strong electromagnetic coupling, so that efficient wireless transmission of electric energy is realized.
The application of the existing magnetic resonance coupling technology, no matter on a portable device with low power or in an electric vehicle or industrial application with high power, in order to ensure the efficient transmission of electric energy, the maximum mutual inductance between coils and the highest electric energy transmission efficiency are realized by strictly fixing the positions of a power supply and a load and keeping the coils coaxially and equidirectionally placed without axial angle difference. And the relative position of the coils is changed, so that the mutual inductance is reduced, and key parameters such as the coupling strength between the coils, the equivalent impedance of a circuit, the resonance state of a system and the like are changed. Under various transmission conditions, especially in a special environment with narrow space and complicated energy transmission path, the wireless power transmission mode based on coaxial equidirectional and optimization measures thereof can not meet the power transmission requirement, the direct change of the relative position of the coils to adapt to the objective environment can greatly influence the transmission capability of the system, even the transmission function can not be realized, and the research on the wireless direction-changing transmission technology can break through the limitation of the short plate on the application of the magnetic resonance coupling technology.
Disclosure of Invention
The invention solves the technical problems that: in a special environment with narrow space and complicated energy transmission path, the wireless power transmission mode based on coaxial equidirectional transmission and the optimization measures thereof can not meet the power transmission requirement, and the power transmission is carried out through a system capable of realizing wireless direction-changing transmission of power, so that the application of the magnetic resonance coupling technology is wider.
The technical scheme adopted by the invention is as follows: a wireless electric energy turning transmission method based on a magnetic resonance coupling technology comprises the following steps:
constructing a resonant circuit of a transmitting coil, a receiving coil and an optimized coil circuit, the optimized coil comprising: the same-direction optimizing coil and the steering optimizing coil;
the method comprises the steps of setting parameters of a transmitting coil, a homodromous optimizing coil, a steering optimizing coil and the transmitting coil, calculating mutual inductance values among the transmitting coil, a receiving coil, the homodromous optimizing coil and the steering optimizing coil by utilizing a magnetic coupling formula, obtaining the load power, the receiving coil current and the receiving coil magnetic linkage by combining kirchhoff law, and calculating a transmission efficiency value.
Further, the parameters of the receiving coil include: the radius of the receiving coil, the distance between the tangent points of the receiving coil and the transmitting coil and the rotation angle of the receiving coil, wherein when the receiving coil rotates, the corresponding outer radius is tangent to the inner radius of the transmitting coil.
Further, the parameters of the equidirectionally optimized coil include: and the distance between the circular points of the homodromous optimization coil and the transmitting coil is optimized, wherein the homodromous optimization coil and the transmitting coil are coaxial and have the same radius, and are parallel to the transmitting coil.
Further, the parameters of the steering optimization coil include: the distance between tangent points of the steering optimization coil and the transmitting coil and the rotation angle of the steering coil, wherein the steering optimization coil and the transmitting coil are coaxial and have the same radius.
Further, the mutual inductance formula of the equidirectional optimized coil and the steering optimized coil is as follows:
Figure BDA0003795282650000031
the mutual inductance formula of the receiving coil and the homodromous optimization coil is as follows:
Figure BDA0003795282650000032
the mutual inductance formula of the receiving coil and the steering optimizing coil is as follows:
Figure BDA0003795282650000033
wherein, mu 0 Is a vacuum permeability, N R For receiving the number of turns of the coil, N i1 Optimizing the number of coil turns for the same direction, N j1 Optimizing the number of turns r of the coil for the same direction S Is the radius of the transmitting coil, r R To receive the coil radius, r i1 Optimizing coil radius r for equidirectional j1 Optimizing the coil radius for steering, α and β being differential angles in the polar coordinates of the transmitter and receiver coils, d α And d β As a differential of the circumference of the transmitter coil and the receiver coil,
Figure BDA0003795282650000034
angle of the plane of the receiving coil to the horizontal plane, θ 1 Optimizing the angle of the coil plane with respect to the horizontal plane for steering, h i1j1 Optimizing the distance of the coils, h, for equidirectional and steering optimization Ri1 Optimizing the distance, h, of the coil and the receiving coil for the same direction Rj1 Optimizing the distance between coil and receiver coil, phi, for steering O Is the loop integral.
Further, kirchhoff's law has the following equation:
Figure BDA0003795282650000035
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003795282650000041
for the current of the transmitting coil, the total impedance of the transmitting coil is
Figure BDA0003795282650000042
Figure BDA0003795282650000043
For the purpose of optimizing the current of the coil in the same direction, the total impedance of the coil is optimized in the same direction
Figure BDA0003795282650000044
Figure BDA0003795282650000045
To optimize the current of the coil for steering, the total impedance of the steering optimizing coil is
Figure BDA0003795282650000046
Figure BDA0003795282650000047
Is the current of the receiving coil; steering optimized coil total impedance of
Figure BDA0003795282650000048
Omega is the angular frequency of system operation, M Ri1 Optimizing coil to receiver coil mutual inductance for same direction, M Rj1 Optimizing coil to receiver coil mutual inductance for steering, M SR For mutual inductance of transmitter coil and receiver coil, M i1j1 Coil mutual inductance is optimized for the same direction and the steering.
Further, the load power includes: increasing the load power when the equidirectional optimization coil or the steering optimization coil is added and the equidirectional optimization coil and the steering optimization coil are simultaneously added, wherein the calculation formula for adding the equidirectional optimization coil or the steering optimization coil is as follows:
Figure BDA0003795282650000049
the invention has the beneficial effects that:
1. the magnetic resonance coupling double-coil system increases the transmission efficiency of the equidirectional optimized coil to 40.25% under the direction change angle of 45 degrees, and can effectively improve the transmission capability of the system; simultaneously adding a homodromous optimizing coil and a steering optimizing coil, and a steering optimizing coil L j1 When the angle relative to the xy plane is 19 degrees, the optimization effect of the system is optimal;
2. the invention realizes the wireless direction-changing transmission of electric energy and expands the application scene of the magnetic coupling resonant wireless charging system.
Drawings
FIG. 1 is an equivalent circuit diagram of the MCR-WPT system of the present invention;
FIG. 2 is a schematic diagram of the rotation of the receive coil of the present invention;
FIG. 3 is a schematic diagram of a receiver coil rotation of the present invention having a receiver coil radius of 0.5 times the radius of the transmitter coil;
FIG. 4 is a WPT system effect graph after the addition of a co-directional optimized coil and a steering optimized coil of the present invention;
FIG. 5 is a graph of the magnetic field strength when the receive coil and the transmit coil of the present invention are placed coaxially;
FIG. 6 is a graph of the magnetic field strength at a tangent to the inside of the transmitter coil for the receiver coil of the present invention;
FIG. 7 is a graph of flux linkage of the receiver coil at different distances from the transmitter coil to the receiver coil in accordance with the present invention;
FIG. 8 is a graph of the magnitude of the receive coil current at different distances from the transmit coil to the receive coil in accordance with the present invention;
FIG. 9 is a graph of flux linkage of the receiver coil of the present invention at different rotation angles;
FIG. 10 is a graph of the current level of the receiver coil at different rotation angles of the receiver coil according to the present invention;
FIG. 11 is a graph of flux linkage magnitude for the receive coil after the addition of a homodromous optimized coil in accordance with the present invention;
FIG. 12 is a graph of the magnitude of the receive coil current after the addition of a homodromous optimization coil in accordance with the present invention;
FIG. 13 is a graph of receive coil flux linkage size after the addition of a co-rotating optimized coil and a rotating optimized coil in accordance with the present invention;
FIG. 14 is a graph of receive coil current levels after the addition of a co-rotating optimized coil and a rotating optimized coil in accordance with the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples, which are simplified schematic drawings and which illustrate only the basic structure of the invention and, therefore, only show the structures associated with the invention.
A wireless electric energy turning transmission method based on a magnetic resonance coupling technology comprises the following steps:
constructing a resonant circuit of a transmitting coil, a receiving coil and an optimized coil circuit, the optimized coil comprising: the same-direction optimizing coil and the steering optimizing coil;
FIG. 1 shows an equivalent circuit diagram of WPT (Wireless Power Transmission) system, AC and R AC The equivalent high-frequency alternating current power supply consists of an alternating current power supply, a rectifying circuit and a high-frequency inverter circuit; l is a radical of an alcohol S 、C S 、R LS The equivalent inductance, capacitance and resistance of the transmitting module and the equivalent impedance of the primary circuit are Z S ；L R 、C R 、R LR 、R L The equivalent impedance of the secondary loop is Z for the equivalent inductance, capacitance, resistance and load resistance of the receiving module R ；M SR For mutual inductance between the receiver coil and the transmitter coil, if the angular frequency of the transmission system is ω, one can obtain:
Figure BDA0003795282650000061
when the transmitting coil and the receiving coil are in resonance, the system has optimal transmission power P L And a transmission efficiency η, expressed as:
Figure BDA0003795282650000062
for a more concise understanding of the coupled system, the equivalent impedance is used for analysis, and the reflected impedance of the secondary loop of the system to the primary loop is:
Figure BDA0003795282650000063
the maximum power transmission theorem shows that when the equivalent resistance of the power supply is matched with the equivalent load impedance, the load obtains the maximum power, when the working frequency of the system is constant with the load, the mutual inductance between the equivalent load and the coil is directly related, and the mutual inductance relation is the key for analyzing the transmission capability of the wireless power transmission system.
As shown in fig. 2, a schematic rotation diagram of a receiving coil is used to construct a WPST (Wireless power transmission) system, a coordinate system is established with a central point of a transmitting coil as an origin of coordinates and a transmitting coil surface as an xy plane, on the basis of original coaxial homodromous symmetric transmission, the center of the receiving coil is kept on a yz plane and moves towards a positive semiaxis direction of a y axis until an outer radius of the receiving coil is tangent to an inner radius of the transmitting coil, a rotation axis is parallel to the x axis with the tangent point as a rotation central point, the center of the coil rotates away from the transmitting coil towards the positive semiaxis of the y axis in the yz plane, at this time, the receiving coil projects on the positive semiaxis of the y axis, the central point is on the positive semiaxis plane of the zy, and a direction of a blue dotted arrow is a transmission direction of energy in the system.
As shown in fig. 3, in order to adapt to a more complex transmission environment, the inner side of the loop coil with the strongest field strength is closer to a steering target, and the radius of the receiving coil is 0.5 times that of the transmitting coil;
the transmitting coil and the receiving coil are not coaxially arranged any more after the rotation, the skin effect is not considered, the coil current uniformly flows in the conductor elements, and the mutual inductance calculation error influence can be well reduced;
the mutual inductance calculation formula is as follows:
Figure BDA0003795282650000071
wherein, mu 0 Is a vacuum permeability, N S Number of turns of transmitting coil, N R To receive the number of coil turns, r S Is the radius of the transmitting coil, r R Is the radius of the receiving coil, alpha and beta are differential angles under the polar coordinates of the transmitting coil and the receiving coil,
Figure BDA0003795282650000072
is the angle of the receiving coil plane with the xy plane, d is the distance between the transmitting and receiving coils;
the coupling between the coils of the direction-changing transmission structure is reduced, and in order to make up for the coupling loss between the coils in non-coaxial transmission, an optimized coil is added between the transmitting coil and the receiving coil to reduce the magnetic flux loss and improve the transmission efficiency of the system.
As shown in fig. 4, the optimized coils are divided into homodromous optimized coils and steering optimized coils; equidirectional optimized coil L i1 Radius r S The transmitting coil is coaxial with the transmitting coil and is arranged close to the positive direction of the z axis, and the axis of the coil is positioned on the z axis of a coordinate system;
when the homodromous optimization coil is added, the transmitting coil and the homodromous optimization coil L i1 M mutual inductance between them Si1 Comprises the following steps:
Figure BDA0003795282650000073
wherein the equidirectional optimized coil is L i1 The number of turns of the equidirectional optimized coil is N i1 The coil compensation capacitance is C i1 ，d Si Optimizing the linear distance between the coil elements for the transmitting coil and the same direction;
when a steering optimizing coil is added, the transmitting coil and the steering optimizing coil L j1 Mutual inductance between M Sj1 Comprises the following steps:
Figure BDA0003795282650000074
wherein the steering optimizing coil is L j1 The angle of the steering-optimized coil plane relative to the xy plane is θ 1 The number of turns of the steering optimizing coil is N j1 The coil compensation capacitance is C j1 ,h Sj1 A linear distance between the transmitting coil element and the steering optimization coil element is set;
steering optimization coil L j1 Radius r S The receiving coil is arranged close to the negative direction of the z axis of the receiving coil, the axis is in the positive half shaft area of the yz plane and tangent with the transmitting coil in the positive half shaft of the y axis, and the angle between the plane of the coil and the xy plane is theta 1 And is and
Figure BDA0003795282650000075
the distance between the equidirectional optimized coil and the steering optimized coil is h i1j1 Mutual inductance of M i1j1 Comprises the following steps:
Figure BDA0003795282650000081
the distance between the receiving coil and the equidirectional optimized coil is h Ri1 Mutual inductance of M Ri1 Comprises the following steps:
Figure BDA0003795282650000082
the distance between the receiving coil and the steering optimizing coil is h Rj1 Mutual inductance M Rj1 Comprises the following steps:
Figure BDA0003795282650000083
the relation among the transmitting coil, the two optimizing coils and the receiving coil is established to establish a theoretical mutual inductance matrix of the turning system:
Figure BDA0003795282650000084
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003795282650000085
being transmitting coilsCurrent, total impedance of the transmitting coil being
Figure BDA0003795282650000086
Figure BDA0003795282650000087
For co-directionally optimizing the current of the coil, the total impedance of the co-directionally optimized coil is
Figure BDA0003795282650000088
Figure BDA0003795282650000089
To optimize the current of the coil for steering, the total impedance of the steering optimizing coil is
Figure BDA00037952826500000810
Figure BDA00037952826500000811
Is the current of the receiving coil; steering optimized coil total impedance of
Figure BDA00037952826500000812
Omega is the angular frequency of system operation, M Ri1 Optimizing coil to receiver coil mutual inductance for same direction, M Rj1 Optimizing coil to receiver coil mutual inductance for steering, M SR For mutual inductance of transmitter coil and receiver coil, M i1j1 Optimizing the mutual inductance of the coils for the same direction and the steering;
solving the current of the receiving coil according to a system circuit equation obtained by kirchhoff law
Figure BDA00037952826500000813
The load power P of a homodromous optimization coil (t = i) or a steering optimization coil (t = j) is increased Li ：
Figure BDA00037952826500000814
The addition of an optimized coil enhances the magnetic field near the receive coil from within the geometry of the system.
As shown in fig. 5, compared with fig. 6, the magnetic field intensity diagram when the receiving coil and the transmitting coil are coaxially placed is that when the receiving coil and the inner side of the transmitting coil are tangent, the radius of the transmitting coil in simulation is 10cm, the conductivity of the coil wire is 6e7S/m, the diameter of the section of the coil wire is 1mm, the radius of the receiving coil is 5cm, and the distance d =6cm between the receiving coil and the transmitting coil, so that the magnetic flux density is higher under the condition that the transmitting coil and the inner diameter coil of the receiving coil are tangent, and the system can obtain higher transmission capacity.
As shown in fig. 4, a structure diagram of a homodromous optimized coil system is added, and a receiving coil is tangent to an inner diameter coil of the homodromous optimized coil, so that the transmission capacity is highest; establishing a coordinate system by taking the central point of the transmitting coil as the origin of coordinates, and optimizing the coil L in the same direction i1 The center is on the z-axis, the axis of the receiving coil rotates on the yz plane, after the optimal radial position of the transmitting coil and the receiving coil is determined, the optimal axial position is determined, and the parameters of each coil are added as follows: transmitting coil L S With equidirectional optimization coil L i1 A distance d Si1 cm, transmitting coil L S Steering optimization coil L j1 Is a distance d Sj1 cm, transmitting coil L S And a receiving coil L R Is dcm, and the coil L is optimized in the same direction i1 Steering optimization coil L j1 A distance of d i1j1 cm, equidirectional optimized coil L i1 And a receiving coil L R Is a distance d Ri1 cm, steering optimizing coil L j1 And a receiving coil L R A distance of d Rj1 cm; transmitting coil L S Inductance of 1.7X 10 -4 H, a transmitting coil L S Series capacitance of 3X 10 4 pF, transmitting coil L S The resistance is 0.422 omega; equidirectional optimized coil L i1 And steering optimizing coil L j1 The inductances are all 1.7 × 10 -4 H, equidirectional optimized coil L i1 And steering optimizing coil L j1 The series capacitors are all 3 x 10 4 pF, homodromous optimization coil L i1 And steering optimizing coil L j1 The resistance is 0.236 omega; receiving coil L R Inductance of 1.7X 10 -7 H, a receiving coil L R A series capacitance of3×10 7 pF, receiving coil L R The resistance was 0.15 Ω.
As shown in fig. 7, a graph of the flux linkage size of the receiving coil at different distances between the transmitting coil and the receiving coil, the flux linkage size passing through the receiving coil at different distances between the transmitting coil and the receiving coil, the flux linkage relationship between the coils in a section away from the resonance frequency being negatively correlated with the coil distance, an optimum transmission distance maximizing the flux linkage exists near the resonance frequency, and when the flux linkage of the receiving coil is the strongest, the distance d =7cm between the two coils, at which time the receiving coil L is R The size of the flux linkage is 1.129X 10 -4 Wb。
As shown in fig. 8, the current magnitude of the receiving coil is plotted when the transmitting coil and the receiving coil are at different distances, the receiving coil maximizes the current at the same position and has the same variation trend as the flux linkage, and when the flux linkage of the receiving coil is strongest, the current magnitude is 9.77A when the distance d =7cm between the two coils.
As shown in fig. 9, in a graph of the flux linkage of the receiving coil at different rotation angles of the receiving coil, the receiving coil is turned under the condition of the optimal distance, and it is observed that the flux linkage of the receiving coil is negatively correlated with the rotation angle.
As shown in fig. 10, in the current magnitude diagram of the receiving coil at different rotation angles of the receiving coil, the current of the receiving coil has the same trend with the magnitude of the flux linkage, and the coupling between the coils is weaker as the rotation angle of the coil is larger, and the current of the receiving coil is smaller.
The system simulation adopts the receiving coil to rotate 45 degrees to realize direction change, and the transmitting coil L S And a receiving coil L R Distance of 7cm, radius of 10cm, number of turns of 30, and coil inductance of 1.7 × 10 -4 H, series capacitance of 3 x 10 4 pF, coil resistance of 0.422 Ω; receiving coil L R Radius of 5cm, number of turns of 10, and coil inductance of 1.7 × 10 -7 H, series capacitance of 3 x 10 7 pF, resistance 0.15 Ω, at which time the receiving coil L R The magnetic chain size is 8.629 × 10 -5 Wb, the current is 7.616A, the power of a transmitting coil of the double-coil system is 138.87W, and the average current is 10.2A; the receiving coil power was 54.33W, the average current was 4.85A, and the transmission efficiency η =39.12%.
Referring to fig. 11, the magnitude of the flux linkage of the receiving coil is plotted after adding the equidirectional optimized coil, and the equidirectional optimized coil L is added i1 There exists an optimum position d Si1 =5cm, and the magnetic flux inside the receiving coil is increased at the position of the equidirectional optimization coil;
referring to fig. 12, the current magnitude of the receiving coil is shown after the addition of the equidirectional optimized coil, and the equidirectional optimized coil L is added i1 In case of (2) there is an optimum position d Si1 And =5cm, the current of the receiving coil also obtains the maximum value at the position, and the optimal coil is proved to have a beam-contracting effect on the flux linkage of the receiving coil.
The WPST system transmission condition after adding the equidirectional optimized coil is as follows:
when d =7cm, d Si1 ＝2cm、d Ri1 When =5cm, P S ＝144.93W、P L ＝44.56W；
When d =7cm, d Si1 ＝3cm、d Ri1 When =4cm, P S ＝151.59W、P L ＝49.67W；
When d =7cm, d Si1 ＝4cm、d Ri1 When =3cm, P S ＝132.41W、P L ＝47.71W；
When d =7cm, d Si1 ＝5cm、d Ri1 When =2cm, P S ＝136.49W、P L ＝54.94W；
When d =7cm, d Si1 ＝6cm、d Ri1 When =1cm, P S ＝131.78W、P L ＝51.58W。
The optimal time receiving coil power is 54.94W, and the average current is 1.92A; transmission efficiency η =40.25%; compared with a double-coil model, the transmission efficiency is improved by 1.13%, and the power is increased by 0.61W; after the homodromous optimization coil is added, the aggregation capacity of the magnetic flux density is greatly improved, and the homodromous optimization coil has a function of improving the transmission capacity of the double-coil WPT system.
For example, FIGS. 13 and 14 are graphs of flux linkage magnitude and current magnitude of the receiver coil after the steering optimization coil is added, and the receiver coil L R And equidirectionally optimized coil L i1 Intermediate position adding steering optimizing coil L j1 Due to the transmitting coil L s And equidirectionally optimized coil L i1 A short distance, steering optimizing coil L j1 Has little influence on the system when d i1j1 ＝d Rj1 =1cm, in the case of the above parameters being fixed, when the steering optimizes the coil L j1 The optimum effect of the system is best when the angle is 19 deg. relative to the xy-plane.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (6)

1. A wireless electric energy turning transmission method based on a magnetic resonance coupling technology is characterized by comprising the following steps:
constructing a resonant circuit of a transmitting coil, a receiving coil and an optimized coil circuit, the optimized coil comprising: a homodromous optimization coil and a steering optimization coil;
the method comprises the steps of setting parameters of a transmitting coil, a homodromous optimizing coil, a steering optimizing coil and the transmitting coil, calculating mutual inductance values among the transmitting coil, a receiving coil, the homodromous optimizing coil and the steering optimizing coil by utilizing a magnetic coupling formula, and calculating by combining kirchhoff's law to obtain load power, receiving coil current and receiving coil flux linkage size and transmission efficiency values.
2. The wireless direction-changing transmission method of electric energy based on the magnetic resonance coupling technology as claimed in claim 1, wherein the parameters of the receiving coil include: the radius of the receiving coil, the distance between the tangent points of the receiving coil and the transmitting coil and the rotation angle of the receiving coil; when the receiving coil rotates, the corresponding outer radius is tangent to the inner radius of the transmitting coil.
3. The wireless electric energy direction-changing transmission method based on the magnetic resonance coupling technology as claimed in claim 1, wherein the parameters of the equidirectional optimization coil comprise: and the distance between tangent points of the homodromous optimization coil and the transmitting coil is equal, wherein the homodromous optimization coil and the transmitting coil are coaxial and have the same radius, and are parallel to the transmitting coil.
4. The wireless electric energy direction-changing transmission method based on the magnetic resonance coupling technology as claimed in claim 1, wherein the parameters of the steering optimization coil comprise: the distance between the turning optimizing coil and the round points of the transmitting coil and the rotation angle of the turning coil are determined; wherein, the steering optimization coil and the transmitting coil are coaxial and have the same radius.
5. The wireless electric energy turning transmission method based on the magnetic resonance coupling technology as claimed in claim 1, wherein the mutual inductance formula of the equidirectional optimized coil and the steering optimized coil is as follows:
Figure FDA0003795282640000011
the mutual inductance formula of the receiving coil and the equidirectional optimization coil is as follows:
Figure FDA0003795282640000021
the mutual inductance formula of the receiving coil and the steering optimizing coil is as follows:
Figure FDA0003795282640000022
wherein, mu 0 Is a vacuum permeability, N R For receiving the number of turns of the coil, N i1 Optimizing the number of coil turns, N, for the same direction j1 Optimizing the number of turns of the coil r for the same direction S Is the radius of the transmitting coil, r R Is the radius of the receiving coil, r i1 Optimizing coil radius r for equidirectional j1 Optimizing the coil radius for steering, α and β being differential angles in the polar coordinates of the transmitter and receiver coils, d α And d β As a differential of the circumference of the transmitter coil and the receiver coil,
Figure FDA00037952826400000212
angle of the receiving coil plane to the horizontal plane, theta 1 Optimizing the angle of the coil plane with respect to the horizontal plane for steering, h i1j1 Optimizing the distance of the coils for equidirectional and turning h Ri1 Optimizing the distance of the coil and the receiving coil for the same direction, h Rj1 Optimizing the distance between coil and receiver coil, phi, for steering 0 Is the loop integral.
6. The wireless electric energy direction-changing transmission method based on the magnetic resonance coupling technology as claimed in claim 1, wherein the formula of kirchhoff's law is as follows:
Figure FDA0003795282640000023
wherein the content of the first and second substances,
Figure FDA00037952826400000211
for the current of the transmitting coil, the total impedance of the transmitting coil is
Figure FDA0003795282640000024
Figure FDA0003795282640000025
For co-directionally optimizing the current of the coil, the total impedance of the co-directionally optimized coil is
Figure FDA0003795282640000026
Figure FDA0003795282640000027
To optimize the current of the coil for steering, the total impedance of the steering coil is
Figure FDA0003795282640000028
Figure FDA0003795282640000029
Is the current of the receiving coil; steering optimized coil total impedance of
Figure FDA00037952826400000210
Omega is the angular frequency of system operation, M Ri1 Optimizing coil to receiver coil mutual inductance for same direction, M Rj1 Optimizing coil to receiver coil mutual inductance for steering, M SR For mutual inductance of transmitter coil and receiver coil, M i1j1 Coil mutual inductance is optimized for the same direction and the steering.
CN202210967429.2A 2022-08-12 2022-08-12 Electric energy wireless direction-changing transmission method based on magnetic resonance coupling technology Pending CN115241989A (en)

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