CN113223830A - Magnetic shielding coil structure of slip ring wireless power transmission system and parameter optimization method thereof - Google Patents

Magnetic shielding coil structure of slip ring wireless power transmission system and parameter optimization method thereof Download PDF

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CN113223830A
CN113223830A CN202110445619.3A CN202110445619A CN113223830A CN 113223830 A CN113223830 A CN 113223830A CN 202110445619 A CN202110445619 A CN 202110445619A CN 113223830 A CN113223830 A CN 113223830A
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coil
slip ring
shielding
circuit board
capacitor circuit
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CN113223830B (en
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肖文勋
唐哲人
张波
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South China University of Technology SCUT
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    • 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
    • H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
    • G—PHYSICS
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    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
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Abstract

The invention discloses a magnetic shielding coil structure of a slip ring wireless power transmission system and a parameter optimization method thereof, wherein the magnetic shielding coil structure comprises a slip ring base, a slip ring, a high-frequency inverter power supply, a primary coil, a first resonant capacitor circuit board, a secondary coil, a second resonant capacitor circuit board, a winding cylinder, a first support, a first shielding coil and a third resonant capacitor circuit board which are arranged on the support, a second shielding coil and a fourth resonant capacitor circuit board which are arranged on the support; the slip ring base bears a slip ring, a secondary coil is wound on the surface of the slip ring and connected with a second resonance capacitor circuit board, a winding cylinder is sleeved on the outer side of the slip ring, a primary coil is wound on the surface of the slip ring and connected with a first resonance capacitor circuit board, a high-frequency inverter power supply is respectively connected with the first resonance capacitor circuit board and the primary coil, and a first support and a second support are arranged in the positive direction and the negative direction of the slip ring in the axial direction. The invention reduces the system cost, volume and quality by adding the magnetic shielding coil and provides good magnetic shielding effect.

Description

Magnetic shielding coil structure of slip ring wireless power transmission system and parameter optimization method thereof
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a magnetic shielding coil structure of a slip ring wireless power transmission system and a parameter optimization method thereof.
Background
With the progress of electronic science and the development of human civilization, a great number of electronic products are generated, and the traditional wire transmission mode cannot be suitable for all scenes. There is a need for a higher security level, contactless transmission of electrical energy transmission devices, like medical products implanted in the body, mine equipment, etc. It is indispensable to further study wireless power transmission and popularize its application.
When the wireless power transmission system transmits energy, an electromagnetic field leaks, and the safety of human bodies and other equipment is affected. In order to solve the problem of electromagnetic leakage, in addition to establishing corresponding standards, a number of researchers have proposed solutions. The main solutions at present are the following four: metal conductor shielding, ferrite shielding, active coil shielding, passive resonant coil shielding.
When different application scenes are met, different magnetic shielding modes are generally required to be configured. When a wireless power supply system is arranged for the rotating equipment, an inductive coupling type and a capacitive coupling type can be adopted, the traditional electromagnetic cavity mode is still adopted for electromagnetic field shielding adopting the capacitive coupling type, the problem of electric field leakage cannot be effectively solved, and meanwhile, the equipment is heavy in quality and high in cost. As for the inductive coupling type, a ferrite shielding mode is adopted by some researchers, but the ferrite shielding mode is not suitable for high frequency, and simultaneously, efficiency reduction and cost increase are brought to a system; the ferrite shielding mode is optimized by scholars, the weight of equipment is reduced under the condition of meeting the shielding requirement, but the system quality is still greatly increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a magnetic shielding coil structure of a slip ring wireless power transmission system and a parameter optimization method thereof, can reduce the cost, the volume and the quality of the system by adding a magnetic shielding coil, does not influence the efficient operation of the system, and provides a good magnetic shielding effect.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the magnetic shielding coil structure of the slip ring wireless power transmission system comprises a slip ring base, a slip ring, a high-frequency inverter power supply, a primary coil, a first resonance capacitor circuit board, a secondary coil, a second resonance capacitor circuit board, a winding cylinder, a first support, a second support, a first shielding coil, a third resonance capacitor circuit board, a second shielding coil and a fourth resonance capacitor circuit board; the slip ring base bears a slip ring and is fixed at a central position, a secondary coil is wound on the surface of the slip ring, the secondary coil is connected with a second resonance capacitor circuit board to form a series compensation structure, the winding cylinder is sleeved outside the slip ring, a primary coil is wound on the surface of the winding cylinder, the primary coil is connected with a first resonance capacitor circuit board to form the series compensation structure, one end of the high-frequency inverter power supply is connected with the first resonance capacitor circuit board, the other end of the high-frequency inverter power supply is connected with the primary coil, the first support and the second support are respectively arranged in the positive direction and the negative direction of the slip ring in the axial direction and form a whole with the slip ring to rotate together with the slip ring, the first support and the second support are of hollow cylindrical structures with annular grooves outside, a first shielding coil is wound in the grooves of the first support and connected with a third resonance capacitor circuit board to form the series compensation structure, and a second shielding coil is wound in the groove of the second support and is connected with a fourth resonance capacitor circuit board to form a series compensation structure, the third resonance capacitor circuit board is fixed in the first support, and the fourth resonance capacitor circuit board is fixed in the second support.
Furthermore, the second resonance capacitor circuit board is fixed in the second support, and forms a whole with the slip ring base, and can rotate along with the slip ring.
Further, the first shielding coil and the second shielding coil are completely consistent, and the third resonance capacitor circuit board and the fourth resonance capacitor circuit board are completely consistent.
The invention also provides a parameter optimization method of the magnetic shielding coil structure of the slip ring wireless power transmission system, which comprises the following steps:
1) inductance L of primary coil1And a capacitor C of the first resonant capacitor circuit board1Inductance L of the formed branch and secondary winding2And a capacitor C of the second resonant capacitor circuit board2The formed branches are regarded as a series topology, and when the resonance state is reached, the following conditions are met: omega2L1C1＝ω2L2 C 21, and omega is the resonance angular frequency of the slip ring wireless power transmission system; inductance L of the first shield coil3And a capacitor C of the third resonant capacitor circuit board3The branch and the inductance L of the second shielding coil4And a capacitor C of a fourth resonant capacitor circuit board4The formed branches are regarded as a series topology, and when the resonance state is reached, the following conditions are met: omega2L3C3＝ω2L4C4＝0.952Equivalent impedance of the first shield coil
Figure BDA0003036730250000031
Equivalent impedance of the second shield coil
Figure BDA0003036730250000032
2) Magnetic field infinitesimal of coil helical line at certain point in space
Figure BDA0003036730250000033
Can be calculated as:
Figure BDA0003036730250000034
wherein a is the radius of the helix, b is the pitch, and theta1Is the rotation angle of the helix, 0 < theta1＜2nπ，μ0For vacuum permeability, I is the current value of the current source, r, theta2Is the polar coordinate of projection P on xoy surface of cylindrical coordinate system, z is the longitudinal coordinate of cylindrical coordinate system, n is the number of turns of cylindrical spiral line, ax、ay、azIs a unit direction vector of x, y and z directions under a rectangular coordinate system,
Figure BDA0003036730250000035
the magnetic field infinitesimal elements in the x direction, the y direction and the z direction under a rectangular coordinate system are adopted, and A is the integral space coefficient of the spiral line on a target surface; the coordinate coefficients of the magnetic field infinitesimal are expressed by kx, ky and kz, and then:
Figure BDA0003036730250000036
the radius of a circular target surface positioned in the axial positive direction of the slip ring is set to be rtHeight is ztNeglecting the influence generated by the second shielding coil, the magnetic field density film integral phiaComprises the following steps:
φa＝∫∫|B1|rtdθ2dzt+∫∫|B2|rtdθ2dzt+∫∫|B3|rtdθ2dzt
the radius of a circular target surface positioned in the axial negative direction of the slip ring is set to be rtHeight is-ztNeglecting the influence of the first shielding coil, the magnetic field density film integral phibComprises the following steps:
φb＝∫∫|B1|rtdθ2d(-zt)+∫∫|B2|rtdθ2d(-zt)+∫∫|B4|rtdθ2d(-zt)
in the formula, B1Is a magnetic field generated by a primary coil, B2Is the magnetic field generated by the secondary coil, B3Is the magnetic field generated by the first shield coil, B4Is the magnetic field generated by the second shield coil;
3) the radius of the primary coil is equal to the radius r of the slip ring1The radius of the secondary coil is equal to the radius r of the winding cylinder2Radius r of the first shield coil3And radius r of the second shield coil4Equal to the radius r of the winding drum2Spiral line inductance L of primary coil1And the spiral line inductance L of the secondary coil2According to equivalent load R of slip ringloadRequired power PloadBetween primary and secondary windings at the same timeMutual inductance M of12Determined by the inductance of the primary and secondary side coils;
the current in a slip ring wireless power transmission system can be determined using the kirchhoff's voltage law loop equation:
Figure BDA0003036730250000041
in the formula of UinFor high-frequency inverter input voltage, I1、I2、I3、I4Currents of the primary coil, the secondary coil, the first shielding coil and the second shielding coil, M13Is the mutual inductance of the primary coil and the first shielding coil, M14Is the mutual inductance of the primary coil and the second shielding coil, M23Is the mutual inductance of the secondary coil and the first shield coil, M24Is the mutual inductance of the secondary coil and the second shield coil, M34Is the mutual inductance, R, of the first and second shield coils1AC resistance, R, of the primary winding2AC resistance of secondary winding, R3Is the alternating current resistance, R, of the first shield coil4Is the alternating current resistance, k, of the second shield coil13Is the coupling coefficient, k, between the primary coil and the first shield coil14Is the coupling coefficient, k, between the primary coil and the second shield coil23Is the coupling coefficient, k, between the secondary winding and the first shield winding24Is the coupling coefficient, k, between the secondary winding and the second shield winding13、k14、k23、k24Less than 0.004, neglecting induced voltage of the first shielding coil and the second shielding coil to the main coil of the system, and alternating current resistance R of each coil1、R2、R3、R4Are all less than 0.1 omega, and influence caused by the omega is neglected; the coil current can be calculated as:
Figure BDA0003036730250000051
let phiaTo Leq1The derivation is made equal to 0 and,obtaining the optimal shielding inductance value L of the first shielding coilmeq1Comprises the following steps:
Figure BDA0003036730250000052
in the formula:
Figure BDA0003036730250000053
kx1、ky1、kz1is the direction coefficient k of the primary coil in the x, y and z directions under the rectangular space coordinate systemx2、ky2、kz2Is the direction coefficient, k, of the secondary coil in the three directions of x, y and z under the rectangular coordinate system in spacex3、ky3、kz3Is the direction coefficient of the first shielding coil in the x, y and z directions under the rectangular space coordinate system, alpha is the space coefficient of the first shielding coil generating the magnetic field in the positive direction of the slip ring axial direction on the circular target surface, and lambda is the space coefficient of the first shielding coil generating the magnetic field in the positive direction of the slip ring axial direction on the circular target surface1The space coefficient beta of a circular target surface of a magnetic field in the positive direction of the axial direction of the slip ring is generated for the primary coil and the first shielding coil1Generating a space coefficient of a magnetic field of a circular target surface in the positive direction of the axial direction of the slip ring for the secondary coil and the first shielding coil;
let phibTo Leq2The derivation is equal to 0 to obtain the optimal shielding inductance value L of the second shielding coilmeq2Comprises the following steps:
Figure BDA0003036730250000061
in the formula:
Figure BDA0003036730250000062
kx4、ky4、kz4is the direction coefficient of the second shielding coil in the x, y and z directions under the rectangular space coordinate system, and gamma is the second shielding wireThe space coefficient, lambda, of the circular target surface of the magnetic field generated by the ring in the axial positive direction of the slip ring2The space coefficient beta of a circular target surface of a magnetic field in the positive direction of the axial direction of the slip ring is generated for the primary coil and the second shielding coil2And generating the space coefficient of the magnetic field of the secondary coil and the second shielding coil on the circular target surface in the positive direction of the axial direction of the slip ring.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with a slip ring type wireless power transmission system with an added magnetic oxide as a shielding means, the leakage magnetic field shielding effect is better.
2. Compared with a slip ring type wireless power transmission system with an added magnetic oxygen body as a shielding means, the slip ring type wireless power transmission system has the advantages that the shielding structure is smaller in mass, and the loss of slip ring equipment is smaller.
3. The shielding coil adopted by the invention has low coupling coefficient, so that the normal operation of the wireless power transmission system is not influenced.
Drawings
Fig. 1 is an exploded view of a magnetic shield coil structure of the present invention.
Fig. 2 is a front view of a magnetic shield coil structure of the present invention.
Fig. 3 is a left side view of the magnetic shield coil structure of the present invention.
Fig. 4 is a right side view of the magnetic shield coil structure of the present invention.
Fig. 5 is a power waveform diagram of a slip ring wireless power transmission system.
Fig. 6 is a diagram showing the effect of shielding the magnetic field.
Fig. 7 is a comparative graph of the waveform of the target surface magnetic flux density film.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
As shown in fig. 1 to 4, the present embodiment discloses a magnetic shielding coil structure of a slip ring wireless power transmission system, which includes a slip ring base 1, a slip ring 2, a high-frequency inverter power supply 3, a primary coil 4, a first resonant capacitor circuit board 5, a secondary coil 6, a second resonant capacitor circuit board 7, a winding drum 8, a first support 10, a second support 11, a first shielding coil 12, a third resonant capacitor circuit board 13, a second shielding coil 14, and a fourth resonant capacitor circuit board 9; the slip ring base 1 bears a slip ring 2 and is fixed at the central position, a secondary coil 6 is wound on the surface of the slip ring 2, the secondary coil 6 is connected with a second resonance capacitor circuit board 7 to form a series compensation structure, a winding cylinder 8 is sleeved on the outer side of the slip ring 2, a primary coil 4 is wound on the surface of the winding cylinder, the primary coil 4 is connected with a first resonance capacitor 5 circuit board to form a series compensation structure, one end of a high-frequency inverter power supply 3 is connected with the first resonance capacitor circuit board 5, the other end of the high-frequency inverter power supply is connected with the primary coil 4, a first support 10 and a second support 11 are respectively arranged in the positive direction and the negative direction of the axial direction of the slip ring 2 and form a whole with the slip ring 2 to rotate together with the slip ring 2, the second resonance capacitor circuit board 7 is fixed inside the second support 11 to form a whole with the slip ring base 1 and can rotate together with the slip ring 2, first support 10 and second support 11 are the hollow cylinder structure of outer band ring groove, around having first shielding coil 12 in the recess of first support 10 to be connected with third resonance capacitor circuit board 13 and constitute series compensation structure, around having second shielding coil 14 in the recess of second support 11 to be connected with fourth resonance capacitor circuit board 9 and constitute series compensation structure, third resonance capacitor circuit board 13 is fixed in the inside of first support 10, and fourth resonance capacitor circuit board 9 is fixed in the inside of second support 11, first shielding coil 12 and second shielding coil 14 are identical, third resonance capacitor circuit board 13 and fourth resonance capacitor circuit board 9 are identical.
The following is a parameter optimization method of the magnetic shielding coil structure of the slip ring wireless power transmission system in this embodiment, including the following steps:
1) inductance L of primary coil1And a capacitor C of the first resonant capacitor circuit board1Inductance L of the formed branch and secondary winding2And a capacitor C of the second resonant capacitor circuit board2The formed branches are regarded as a series topology, and when the resonance state is reached, the following conditions are met: omega2L1C1＝ω2L2 C 21, and omega is the resonance angular frequency of the slip ring wireless power transmission system; inductance L of the first shield coil3And a capacitor C of the third resonant capacitor circuit board3The branch and the inductance L of the second shielding coil4And a capacitor C of a fourth resonant capacitor circuit board4The formed branches are regarded as a series topology, and when the resonance state is reached, the following conditions are met: omega2L3C3＝ω2L4C4＝0.952Equivalent impedance of the first shield coil
Figure BDA0003036730250000081
Equivalent impedance of the second shield coil
Figure BDA0003036730250000082
2) Magnetic field infinitesimal of coil helical line at certain point in space
Figure BDA0003036730250000083
Can be calculated as:
Figure BDA0003036730250000091
wherein a is the radius of the helix, b is the pitch, and theta1Is the rotation angle of the helix, 0 < theta1＜2nπ，μ0For vacuum permeability, I is the current value of the current source, r, theta2Is the polar coordinate of projection P on xoy surface of cylindrical coordinate system, z is the longitudinal coordinate of cylindrical coordinate system, n is the number of turns of cylindrical spiral line, ax、ay、azIs a unit direction vector of x, y and z directions under a rectangular coordinate system,
Figure BDA0003036730250000092
the magnetic field infinitesimal elements in the x direction, the y direction and the z direction under a rectangular coordinate system are adopted, and A is the integral space coefficient of the spiral line on a target surface; the coordinate coefficients of the magnetic field infinitesimal are expressed by kx, ky and kz, and then:
Figure BDA0003036730250000093
the radius of a circular target surface positioned in the axial positive direction of the slip ring is set to be rtHeight is ztNeglecting the influence generated by the second shielding coil, the magnetic field density film integral phiaComprises the following steps:
φa＝∫∫|B1|rtdθ2dzt+∫∫|B2|rtdθ2dzt+∫∫|B3|rtdθ2dzt
the radius of a circular target surface positioned in the axial negative direction of the slip ring is set to be rtHeight is-ztNeglecting the influence of the first shielding coil, the magnetic field density film integral phibComprises the following steps:
φb＝∫∫|B1|rtdθ2d(-zt)+∫∫|B2|rtdθ2d(-zt)+∫∫|B4|rtdθ2d(-zt)
in the formula, B1Is a magnetic field generated by a primary coil, B2Is the magnetic field generated by the secondary coil, B3Is the magnetic field generated by the first shield coil, B4Is the magnetic field generated by the second shield coil;
3) the radius of the primary coil is equal to the radius r of the slip ring1The radius of the secondary coil is equal to the radius r of the winding cylinder2Radius r of the first shield coil3And radius r of the second shield coil4Equal to the radius r of the winding drum2Spiral line inductance L of primary coil1And the spiral line inductance L of the secondary coil2According to equivalent load R of slip ringloadRequired power PloadDetermining, at the same time, the mutual inductance M between the primary coil and the secondary coil12Is determined by the inductance of the primary and secondary side coils.
The current in a slip ring wireless power transmission system can be determined using the kirchhoff's voltage law loop equation:
Figure BDA0003036730250000101
in the formula of UinFor high-frequency inverter input voltage, I1、I2、I3、I4Currents of the primary coil, the secondary coil, the first shielding coil and the second shielding coil, M13Is the mutual inductance of the primary coil and the first shielding coil, M14Is the mutual inductance of the primary coil and the second shielding coil, M23Is the mutual inductance of the secondary coil and the first shield coil, M24Is the mutual inductance of the secondary coil and the second shield coil, M34Is the mutual inductance, R, of the first and second shield coils1AC resistance, R, of the primary winding2AC resistance of secondary winding, R3Is the alternating current resistance, R, of the first shield coil4Is the alternating current resistance, k, of the second shield coil13Is the coupling coefficient, k, between the primary coil and the first shield coil14Is the coupling coefficient, k, between the primary coil and the second shield coil23Is the coupling coefficient, k, between the secondary winding and the first shield winding24Is the coupling coefficient, k, between the secondary winding and the second shield winding13、k14、k23、k24Less than 0.004, neglecting induced voltage of the first shielding coil and the second shielding coil to the main coil of the system, and alternating current resistance R of each coil1、R2、R3、R4Are all less than 0.1 omega, and influence caused by the omega is neglected; the coil current can be calculated as:
Figure BDA0003036730250000111
let phiaTo Leq1The derivation is equal to 0 to obtain the optimal shielding inductance value L of the first shielding coilmeq1Comprises the following steps:
Figure BDA0003036730250000112
in the formula:
Figure BDA0003036730250000113
kx1、ky1、kz1is the direction coefficient k of the primary coil in the x, y and z directions under the rectangular space coordinate systemx2、ky2、kz2Is the direction coefficient, k, of the secondary coil in the three directions of x, y and z under the rectangular coordinate system in spacex3、ky3、kz3Is the direction coefficient of the first shielding coil in the x, y and z directions under the rectangular space coordinate system, alpha is the space coefficient of the first shielding coil generating the magnetic field in the positive direction of the slip ring axial direction on the circular target surface, and lambda is the space coefficient of the first shielding coil generating the magnetic field in the positive direction of the slip ring axial direction on the circular target surface1The space coefficient beta of a circular target surface of a magnetic field in the positive direction of the axial direction of the slip ring is generated for the primary coil and the first shielding coil1Generating a space coefficient of a magnetic field of a circular target surface in the positive direction of the axial direction of the slip ring for the secondary coil and the first shielding coil;
let phibTo Leq2The derivation is equal to 0 to obtain the optimal shielding inductance value L of the second shielding coilmeq2Comprises the following steps:
Figure BDA0003036730250000121
in the formula:
Figure BDA0003036730250000122
kx4、ky4、kz4the coefficients of the second shielding coil in the x, y and z directions under a space rectangular coordinate system are shown, gamma is the space coefficient of the circular target surface of the magnetic field generated by the second shielding coil in the positive direction of the slip ring in the axial direction, and lambda is the space coefficient of the circular target surface2The space coefficient beta of a circular target surface of a magnetic field in the positive direction of the axial direction of the slip ring is generated for the primary coil and the second shielding coil2Generating magnetic field for secondary coil and second shielding coilThe space coefficient of the circular target surface in the axial positive direction of the ring.
According to the structure and the method of the embodiment, the Comsol simulation software is adopted to construct the simulation model, the specific parameters are set as follows, and the angular frequency ω of the system is 150 × 103 X 2 pi, system input voltage is UinInductance L of primary winding of 70V113.78 muh, capacitance C of the first resonant capacitor circuit board181.66nF, inductance L of secondary winding216.88 muH, capacitance C of the second resonant capacitor circuit board266.70 nF. Inductance L of the first shield coil32.425 muh, capacitance C of the third resonant capacitor circuit board3532.9nF, inductance L of the second shield coil42.425 muh, capacitance C of the fourth resonant capacitor circuit board4532.9nF, load RloadSet to 9.2 omega. The mutual inductance M of the primary coil and the secondary coil can be obtained through simulation calculation1211.59 muH, mutual inductance M of primary coil and first shield coil130.36 muH, mutual inductance M of primary coil and second shield coil140.36 mu H, mutual inductance M of the secondary coil and the first shield coil230.32 muH, mutual inductance M of secondary coil and second shield coil240.32 μ H. The power transmission of the system is shown in fig. 5, the two-dimensional axisymmetric magnetic field distribution is shown in fig. 6, the magnetic field waveforms before and after the shield addition at the plane 160mm away from the axis are shown in fig. 7, and the leakage magnetic field is reduced by 87.61% by taking 1000 data points after 0.3s for average calculation.
The simulation result shows that the magnetic shielding coil structure of the slip ring wireless power transmission system and the parameter optimization method thereof can meet the expected purpose, and solve the problems of magnetic field leakage and magnetic field shielding of the traditional slip ring wireless power transmission system, and efficiency reduction and system quality increase caused by the problems.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (4)

1. Magnetic shield coil structure of sliding ring wireless power transmission system, its characterized in that: the high-frequency inverter comprises a slip ring base, a slip ring, a high-frequency inverter power supply, a primary coil, a first resonance capacitor circuit board, a secondary coil, a second resonance capacitor circuit board, a winding cylinder, a first support, a second support, a first shielding coil, a third resonance capacitor circuit board, a second shielding coil and a fourth resonance capacitor circuit board; the slip ring base bears a slip ring and is fixed at a central position, a secondary coil is wound on the surface of the slip ring, the secondary coil is connected with a second resonance capacitor circuit board to form a series compensation structure, the winding cylinder is sleeved outside the slip ring, a primary coil is wound on the surface of the winding cylinder, the primary coil is connected with a first resonance capacitor circuit board to form the series compensation structure, one end of the high-frequency inverter power supply is connected with the first resonance capacitor circuit board, the other end of the high-frequency inverter power supply is connected with the primary coil, the first support and the second support are respectively arranged in the positive direction and the negative direction of the slip ring in the axial direction and form a whole with the slip ring to rotate together with the slip ring, the first support and the second support are of hollow cylindrical structures with annular grooves outside, a first shielding coil is wound in the grooves of the first support and connected with a third resonance capacitor circuit board to form the series compensation structure, and a second shielding coil is wound in the groove of the second support and is connected with a fourth resonance capacitor circuit board to form a series compensation structure, the third resonance capacitor circuit board is fixed in the first support, and the fourth resonance capacitor circuit board is fixed in the second support.
2. The magnetically shielded coil structure of a slipring wireless power transmission system according to claim 1, characterized in that: the second resonance capacitor circuit board is fixed in the second support, forms a whole with the slip ring base, and can rotate along with the slip ring.
3. The magnetically shielded coil structure of a slipring wireless power transmission system according to claim 1, characterized in that: the first shielding coil and the second shielding coil are completely consistent, and the third resonance capacitor circuit board and the fourth resonance capacitor circuit board are completely consistent.
4. A method for optimizing parameters of a magnetically shielded coil structure of a slipring radio transmission system according to any of the claims 1-3, characterized in that it comprises the steps of:
1) inductance L of primary coil1And a capacitor C of the first resonant capacitor circuit board1Inductance L of the formed branch and secondary winding2And a capacitor C of the second resonant capacitor circuit board2The formed branches are regarded as a series topology, and when the resonance state is reached, the following conditions are met: omega2L1C1＝ω2L2C21, and omega is the resonance angular frequency of the slip ring wireless power transmission system; inductance L of the first shield coil3And a capacitor C of the third resonant capacitor circuit board3The branch and the inductance L of the second shielding coil4And a capacitor C of a fourth resonant capacitor circuit board4The formed branches are regarded as a series topology, and when the resonance state is reached, the following conditions are met: omega2L3C3＝ω2L4C4＝0.952Equivalent impedance of the first shield coil
Figure FDA0003036730240000021
Equivalent impedance of the second shield coil
Figure FDA0003036730240000022
2) Magnetic field infinitesimal of coil helical line at certain point in space
Figure FDA0003036730240000023
Can be calculated as:
Figure FDA0003036730240000024
wherein a is the radius of the helix, b is the pitch, and theta1Is the rotation angle of the helix, 0 < theta1＜2nπ，μ0For vacuum permeability, I is the current value of the current source, r, theta2Is the polar coordinate of projection P on xoy surface of cylindrical coordinate system, z is the longitudinal coordinate of cylindrical coordinate system, n is the number of turns of cylindrical spiral line, ax、ay、azIs a unit direction vector of x, y and z directions under a rectangular coordinate system,
Figure FDA0003036730240000025
the magnetic field infinitesimal elements in the x direction, the y direction and the z direction under a rectangular coordinate system are adopted, and A is the integral space coefficient of the spiral line on a target surface; the coordinate coefficients of the magnetic field infinitesimal are expressed by kx, ky and kz, and then:
Figure FDA0003036730240000026
the radius of a circular target surface positioned in the axial positive direction of the slip ring is set to be rtHeight is ztNeglecting the influence generated by the second shielding coil, the magnetic field density film integral phiaComprises the following steps:
φa＝∫∫|B1|rtdθ2dzt+∫∫|B2|rtdθ2dzt+∫∫|B3|rtdθ2dzt
the radius of a circular target surface positioned in the axial negative direction of the slip ring is set to be rtHeight is-ztNeglecting the influence of the first shielding coil, the magnetic field density film integral phibComprises the following steps:
φb＝∫∫|B1|rtdθ2d(-zt)+∫∫|B2|rtdθ2d(-zt)+∫∫|B4|rtdθ2d(-zt)
in the formula, B1Is a magnetic field generated by a primary coil, B2Is the magnetic field generated by the secondary coil, B3Is the magnetic field generated by the first shield coil, B4Is the second shield coilA generated magnetic field;
3) the radius of the primary coil is equal to the radius r of the slip ring1The radius of the secondary coil is equal to the radius r of the winding cylinder2Radius r of the first shield coil3And radius r of the second shield coil4Equal to the radius r of the winding drum2Spiral line inductance L of primary coil1And the spiral line inductance L of the secondary coil2According to equivalent load R of slip ringloadRequired power PloadDetermining, at the same time, the mutual inductance M between the primary coil and the secondary coil12Determined by the inductance of the primary and secondary side coils;
the current in a slip ring wireless power transmission system can be determined using the kirchhoff's voltage law loop equation:
Figure FDA0003036730240000031
in the formula of UinFor high-frequency inverter input voltage, I1、I2、I3、I4Currents of the primary coil, the secondary coil, the first shielding coil and the second shielding coil, M13Is the mutual inductance of the primary coil and the first shielding coil, M14Is the mutual inductance of the primary coil and the second shielding coil, M23Is the mutual inductance of the secondary coil and the first shield coil, M24Is the mutual inductance of the secondary coil and the second shield coil, M34Is the mutual inductance, R, of the first and second shield coils1AC resistance, R, of the primary winding2AC resistance of secondary winding, R3Is the alternating current resistance, R, of the first shield coil4Is the alternating current resistance, k, of the second shield coil13Is the coupling coefficient, k, between the primary coil and the first shield coil14Is the coupling coefficient, k, between the primary coil and the second shield coil23Is the coupling coefficient, k, between the secondary winding and the first shield winding24Is the coupling coefficient, k, between the secondary winding and the second shield winding13、k14、k23、k24Less than 0.004, ignore firstInduced voltage of the system main coil by the shield coil and the second shield coil, and AC resistance R of each coil1、R2、R3、R4Are all less than 0.1 omega, and influence caused by the omega is neglected; the coil current can be calculated as:
Figure FDA0003036730240000041
let phiaTo Leq1The derivation is equal to 0 to obtain the optimal shielding inductance value L of the first shielding coilmeq1Comprises the following steps:
Figure FDA0003036730240000042
in the formula:
Figure FDA0003036730240000043
kx1、ky1、kz1is the direction coefficient k of the primary coil in the x, y and z directions under the rectangular space coordinate systemx2、ky2、kz2Is the direction coefficient, k, of the secondary coil in the three directions of x, y and z under the rectangular coordinate system in spacex3、ky3、kz3Is the direction coefficient of the first shielding coil in the x, y and z directions under the rectangular space coordinate system, alpha is the space coefficient of the first shielding coil generating the magnetic field in the positive direction of the slip ring axial direction on the circular target surface, and lambda is the space coefficient of the first shielding coil generating the magnetic field in the positive direction of the slip ring axial direction on the circular target surface1The space coefficient beta of a circular target surface of a magnetic field in the positive direction of the axial direction of the slip ring is generated for the primary coil and the first shielding coil1Generating a space coefficient of a magnetic field of a circular target surface in the positive direction of the axial direction of the slip ring for the secondary coil and the first shielding coil;
let phibTo Leq2The derivation is equal to 0 to obtain the optimal shielding inductance value L of the second shielding coilmeq2Comprises the following steps:
Figure FDA0003036730240000051
in the formula:
Figure FDA0003036730240000052
kx4、ky4、kz4the coefficients of the second shielding coil in the x, y and z directions under a space rectangular coordinate system are shown, gamma is the space coefficient of the circular target surface of the magnetic field generated by the second shielding coil in the positive direction of the slip ring in the axial direction, and lambda is the space coefficient of the circular target surface2The space coefficient beta of a circular target surface of a magnetic field in the positive direction of the axial direction of the slip ring is generated for the primary coil and the second shielding coil2And generating the space coefficient of the magnetic field of the secondary coil and the second shielding coil on the circular target surface in the positive direction of the axial direction of the slip ring.
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