CN116131476A - Short-distance transmitting coil structure applied to three-phase dynamic wireless power supply system - Google Patents

Short-distance transmitting coil structure applied to three-phase dynamic wireless power supply system Download PDF

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Publication number
CN116131476A
CN116131476A CN202211680837.6A CN202211680837A CN116131476A CN 116131476 A CN116131476 A CN 116131476A CN 202211680837 A CN202211680837 A CN 202211680837A CN 116131476 A CN116131476 A CN 116131476A
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short
coil
magnetic field
distance
transmitting coil
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宋贝贝
张明涛
崔淑梅
朱春波
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Zhengzhou Research Institute Of Harbin Institute Of Technology
Harbin Institute of Technology
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Zhengzhou Research Institute Of Harbin Institute Of Technology
Harbin Institute of Technology
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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
    • 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
    • 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
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • 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
    • 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
    • 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 provides a short-distance transmitting coil structure applied to a three-phase dynamic wireless power supply system. The structure is used for solving the problem of large fluctuation of induced voltage in the three-phase dynamic wireless charging system. The structure of the invention eliminates the harmonic wave traveling wave magnetic field generated by the three-phase transmitting coil by utilizing the short-distance transmitting coil, so that the plane where the receiving end is positioned mainly contains the fundamental wave traveling wave magnetic field, and the amplitude of the induced voltage of the receiving coil is basically unchanged in the moving process, thereby effectively inhibiting the fluctuation of the output voltage in the three-phase dynamic wireless power supply system and realizing the constancy of the output voltage.

Description

Short-distance transmitting coil structure applied to three-phase dynamic wireless power supply system
Technical Field
The invention belongs to the technical field of wireless power transmission and rail transit, and particularly relates to a short-distance transmitting coil structure applied to a three-phase dynamic wireless power supply system.
Background
Compared with the traditional wired power supply mode, the non-contact characteristic of the wireless power supply mode has advantages in the aspects of safety, convenience and the like. With the continuous progress and perfection of wireless power transmission technology, the wireless power transmission technology is increasingly applied, and the wireless power transmission technology starts to move from low-power equipment such as toothbrushes, mobile phones and computers to high-power equipment such as automobiles and ships. The wireless power supply mode can be divided into two modes of static wireless power supply and dynamic wireless power supply according to whether the transmitting end and the receiving end are in a relative movement state or not. For a dynamic wireless power supply mode, the receiving side can realize uninterrupted transmission of energy in the movement process, so that a new solution idea is provided for the problem of short endurance mileage of the electric automobile, namely, electric energy supply can be performed in the movement process.
Various research institutions at home and abroad conduct many researches on a dynamic wireless power supply system, the problem that the wireless power supply power level is generally low is solved by three-phase wireless power supply, a receiving end can continuously move in the charging process, coupling mutual inductance between a transmitting coil and a receiving coil can continuously change, and fluctuation of output power is further caused. The larger output power fluctuation can bring a plurality of negative effects to the system, such as stress problems of devices such as a switch of a receiving end, service life problems of the devices, stability problems of the system and the like.
The short-distance transmitting coil structure can restrain the harmonic component of the traveling wave magnetic field generated by the three-phase dynamic wireless power supply system on the plane of the receiving end by reasonably designing the length value of the short-distance transmitting coil, can realize the stability of the output power of the system, and fundamentally solves the problems caused by power fluctuation.
Disclosure of Invention
The invention aims to solve the problem of large fluctuation of induced voltage in a three-phase dynamic wireless charging system, and provides a short-distance transmitting coil structure applied to the three-phase dynamic wireless power supply system.
The invention is realized by the following technical proposal, which provides a method applied toShort-range transmitting coil structure of three-phase dynamic wireless power supply system, in which single-phase transmitting coil is equivalently regarded as being formed by a plurality of coil lengths l T <The rectangular coils of tau are laid in an array along the x-axis direction, and the distance Deltax between two adjacent transmitting coils is equal to the distance Deltax between two adjacent transmitting coils T ＝τ-l T The method comprises the steps of carrying out a first treatment on the surface of the The center distance of two adjacent rectangular coils is tau, and the two adjacent transmitting coils are connected through a wire; by reasonably designing the length l of the short-distance transmitting coil T The harmonic wave traveling wave magnetic field of the transmitting coil on the plane of the receiving end can be eliminated, and the purpose of inhibiting fluctuation of output power in the three-phase dynamic wireless power supply system is achieved.
Further, the length l of the short-distance transmitting coil T The design method specifically comprises the following steps: taking an A-phase coil in a three-phase short-distance structure as an example, when the coil is electrified with direct current i a＝ I 0 When the phase A coil generates fundamental wave and i-order harmonic magnetic fields on the plane of the receiving end;
for the fundamental magnetic field, the magnetic fields produced by the number 1 and number 2 wires differ in the x-axis direction by (τ -l) T ) Is different in phase by θ 1 Wherein θ is 1 Length of coil l T In relation, satisfy:
Figure BDA0004019272630000021
from the geometrical relationship shown in the magnetic field phasor diagram, the fundamental magnetic field B z-A1 The amplitude of (2) satisfies:
Figure BDA0004019272630000022
wherein N is T Is equivalent to the number of turns of a rectangular coil, B z-1 The amplitude, k, of the fundamental wave travelling wave magnetic field generated at the receiving end for a single coil sT-1 The expression of (2) satisfies:
Figure BDA0004019272630000023
easily-verified k sT-1 Less than or equal to 1, and k is sT-1 Is defined as a fundamental wave short-distance coefficient of the transmitting end and used for representing a fundamental wave magnetic field B after the transmitting end adopts a short-distance coil z-A1 The degree of amplitude decay of (a); wherein the subscript sT represents Short-pitch transmitter coil, namely a Short-distance transmitting coil, and the number represents the harmonic frequency of the travelling wave magnetic field;
similarly, the phase angle theta of the phase difference of the i-order harmonic magnetic field along the x-axis direction generated by the wires with the numbers 1 and 2 can be obtained i The method meets the following conditions:
Figure BDA0004019272630000024
according to the geometrical relationship shown in the magnetic field phasor diagram, the i-order harmonic magnetic field B in the short-distance transmitting coil can be obtained z-Ai The amplitude of (2) satisfies:
Figure BDA0004019272630000025
wherein k is sT-i The expression of (2) satisfies:
Figure BDA0004019272630000026
will k sT-i Is defined as an i-order harmonic short-distance coefficient of the transmitting end, and represents an i-order harmonic magnetic field B after the transmitting end adopts a short-distance coil z-A1 Is a magnitude decay of (a);
to eliminate the i-th harmonic magnetic field B z-A1 ，k sT-i The following should be satisfied: k (k) sT-i =0, solution:
Figure BDA0004019272630000031
in summary, by reasonably designing the length l of the short-distance transmitting coil T The purpose of eliminating the i-order harmonic magnetic field and inhibiting output fluctuation can be achieved.
Further, the current flow directions of two adjacent rectangular coils of the short-distance transmitting coil are identical.
Further, if the length of the short-distance transmitting coil in the structure is designed to eliminate the fifth harmonic magnetic field generated by the transmitting coil
Figure BDA0004019272630000032
Wherein m=1, 2,3 … n, n is a positive integer of 1 or more.
Further, if the length of the short-distance transmitting coil in the structure is designed to eliminate the seventh harmonic magnetic field generated by the transmitting coil
Figure BDA0004019272630000033
Wherein m=1, 2,3 … n, n is a positive integer of 1 or more.
Further, if the length of the short-distance transmitting coil in the structure is designed to simultaneously attenuate the fifth harmonic magnetic field and the seventh harmonic magnetic field generated by the transmitting coil
Figure BDA0004019272630000034
Wherein m=1, 2,3 … n, n is a positive integer of 1 or more.
Further, in order to maximize the output voltage, the length of the transmitting-end coil should be made close to the pole pitch τ, i.e., m should be selected such that l T As close as possible to the pole pitch τ, since the harmonic order i is odd, the order should be:
Figure BDA0004019272630000035
length of short-range transmit coil T The method comprises the following steps:
Figure BDA0004019272630000036
the invention has the beneficial effects that:
(1) The structure can ensure that the third harmonic of the travelling wave magnetic field generated in space is zero;
(2) If the rectangular coil length in the structure is designed as
Figure BDA0004019272630000037
Wherein m=1, 2,3 … n, n is a positive integer greater than or equal to 1; at the moment, the 5 th harmonic amplitude of the traveling wave magnetic field in the plane where the receiving coil is positioned is 0, so that the 5 th harmonic magnetic field generated in the plane of the receiving end can be eliminated, the 5 th harmonic content of the induced electromotive force is avoided in the process that the receiving end moves along with the charging equipment, and the output voltage of the system is more stable;
(3) If the rectangular coil length in the structure is designed as
Figure BDA0004019272630000038
Wherein m=1, 2,3 … n, n is a positive integer greater than or equal to 1; at the moment, the amplitude of the 7 th harmonic of the traveling wave magnetic field in the plane where the receiving coil is positioned is 0, so that the 7 th harmonic magnetic field generated in the plane of the receiving end can be eliminated, the induced electromotive force does not have 7 th harmonic content any more in the process that the receiving end moves along with the charging equipment, and the output voltage of the system is more stable;
(4) If the rectangular coil length in the structure is designed as
Figure BDA0004019272630000039
Wherein m=1, 2,3 … n, n is a positive integer greater than or equal to 1; at this time, the amplitude of the 7 th harmonic of the traveling wave magnetic field in the plane where the receiving coil is located is 0, so that the 5 th and 7 th harmonic magnetic fields generated in the plane of the receiving end can be simultaneously restrained, the 5 th harmonic content and the 7 th harmonic content of the induced electromotive force are reduced in the process that the receiving end moves along with the charging equipment, and the output voltage of the system is more stable.
Drawings
Fig. 1 is a schematic diagram of a conventional serpentine transmit coil configuration. Wherein, (a) is a single-phase structure, and (b) is a three-phase structure.
Fig. 2 is a schematic diagram of a short-range transmit coil configuration. Wherein, (a) is a single-phase structure, and (b) is a three-phase structure.
FIG. 3 is a B generated by the A-phase short-range transmitting coil in the plane of the receiving end z Distribution and phasor diagram thereof.
FIG. 4 is a short-range coefficient k at the transmitting end sT I as a function of the transmit coil length l T Is a graph of the change relation of (1).
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a transmitting coil structure which is applied to a three-phase dynamic wireless power supply system and can enable the induction voltage of a receiving end to be constant, so as to solve the problem of large fluctuation of the induction voltage in the three-phase dynamic wireless charging system. The structure of the invention eliminates the harmonic wave traveling wave magnetic field generated by the three-phase transmitting coil by utilizing the short-distance transmitting coil, so that the plane where the receiving end is positioned mainly contains the fundamental wave traveling wave magnetic field, and the amplitude of the induced voltage of the receiving coil is basically unchanged in the moving process, thereby effectively inhibiting the fluctuation of the output voltage in the three-phase dynamic wireless power supply system and realizing the constancy of the output voltage.
As shown in FIG. 1, the winding mode of the single-phase and three-phase winding type coil is a tail-swing mode along the x-axis (travelling direction), each phase is staggered with each other, the staggered distance is one third of the period, and the winding mode can be equivalent to four compactly connected lengths l T Rectangular coil =τ. The three-phase coil structure suitable for dynamic wireless power supply in the invention has the coil wound for a length of l at first T Width w T Then, the coil is drawn out along the x-axis from the input end side (y-axis forward side) by a length τ, and then, is wound continuously by a length l T Width w T And then sequentially wound in the same manner. It can be found that the center distance and the pole distance of two coils are tau, the pole distance is larger than the length of the coils, and the current directions of the outer sides of two adjacent rectangular coils are consistent. If each coil is laid in a plurality of turns, it should be laid closely by a distance of length l for each rectangle T And by designing, better performance can be obtained.
The short-distance transmitting coil applied to the dynamic three-phase wireless power supply system can be arranged below the ground but is not limited to the short-distance transmitting coil; a schematic diagram of a single-phase short-range coil and a three-phase short-range coil is shown in fig. 2.
With reference to fig. 1-4, the present invention proposes a short-range transmitting coil structure applied to a three-phase dynamic wireless power supply system, in which a single-phase transmitting coil is equivalently regarded as being composed of a plurality of coil lengths l T <The rectangular coils of tau are laid in an array along the x-axis direction, and the distance Deltax between two adjacent transmitting coils is equal to the distance Deltax between two adjacent transmitting coils T ＝τ-l T The method comprises the steps of carrying out a first treatment on the surface of the The center distance of two adjacent rectangular coils is tau, and the two adjacent transmitting coils are connected through a blue dotted line wire in the figure; by reasonably designing the length l of the short-distance transmitting coil T The harmonic wave traveling wave magnetic field of the transmitting coil on the plane of the receiving end can be eliminated, and the purpose of inhibiting fluctuation of output power in the three-phase dynamic wireless power supply system is achieved. In any plane parallel to the transmitting coil, the generated travelling wave magnetic field has only odd harmonics, and the 3 rd harmonic magnetic fields of the three-phase wireless power supply system can cancel each other in space.
Length l of the short-distance transmitting coil T The design method specifically comprises the following steps: taking an A-phase coil in a three-phase short-distance structure as an example, when the coil is electrified with direct current i a ＝I 0 When the phase A coil generates fundamental wave and i-order harmonic magnetic fields on the plane of the receiving end; as shown in fig. 3.
For the fundamental magnetic field, the magnetic fields produced by the number 1 and number 2 wires differ in the x-axis direction by (τ -l) T ) Is different in phase by θ 1 Wherein θ is 1 Length of coil l T In relation, satisfy:
Figure BDA0004019272630000051
from the geometrical relationship shown in the magnetic field phasor diagram, the fundamental magnetic field B z-A1 The amplitude of (2) satisfies:
Figure BDA0004019272630000052
wherein N is T Is equivalent to the number of turns of a rectangular coil, B z-1 The amplitude, k, of the fundamental wave travelling wave magnetic field generated at the receiving end for a single coil sT-1 The expression of (2) satisfies:
Figure BDA0004019272630000053
easily-verified k sT-1 Less than or equal to 1, and k is sT-1 Is defined as a fundamental wave short-distance coefficient of the transmitting end and used for representing a fundamental wave magnetic field B after the transmitting end adopts a short-distance coil z-A1 The degree of amplitude decay of (a); wherein the subscript sT represents Short-pitch transmitter coil, namely a Short-distance transmitting coil, and the number represents the harmonic frequency of the travelling wave magnetic field;
similarly, the phase angle theta of the phase difference of the i-order harmonic magnetic field along the x-axis direction generated by the wires with the numbers 1 and 2 can be obtained i The method meets the following conditions:
Figure BDA0004019272630000054
according to the geometrical relationship shown in the magnetic field phasor diagram, the i-order harmonic magnetic field B in the short-distance transmitting coil can be obtained z-Ai The amplitude of (2) satisfies:
Figure BDA0004019272630000055
wherein k is sT-i The expression of (2) satisfies:
Figure BDA0004019272630000056
will k sT-i Is defined as an i-order harmonic short-distance coefficient of the transmitting end, and represents an i-order harmonic magnetic field B after the transmitting end adopts a short-distance coil z-A1 Is a magnitude decay of (a);
to eliminate the i-th harmonic magnetic field B z-A1 ，k sT-i The following should be satisfied: k (k) sT-i =0, solve：
Figure BDA0004019272630000061
In summary, by reasonably designing the length l of the short-distance transmitting coil T The purpose of eliminating the i-order harmonic magnetic field and inhibiting output fluctuation can be achieved.
In the process of designing a three-phase short-distance transmitting coil of a wireless power supply system, in order to achieve the optimal output fluctuation suppression effect, the transmitting coil is designed with the aim of eliminating a 5 th harmonic magnetic field. The length of the short-distance transmitting coil affects both the amplitude of the harmonic magnetic field related to the output voltage fluctuation and the amplitude of the fundamental magnetic field, and as can be seen from the above working principle, the effect of the transmitting coil length on the harmonic magnetic field of the plane where the receiving end is located is represented by the short-distance coefficient, and fig. 4 shows the short-distance coefficient k of the transmitting end sT-1 And k sT-i With coil length l T Is a changing relationship of (a). It can be seen that:
(1) Length l of short-range transmitting coil when eliminating 5 th harmonic magnetic field generated on receiving end plane T The design is as follows:
Figure BDA0004019272630000062
wherein m=1, 2,3 … n, n is a positive integer greater than or equal to 1; at this time, the amplitude of 5 th harmonic of the travelling wave magnetic field in the plane where the receiving coil is located is 0, and the 5 th harmonic content in the induced electromotive force of the receiving end is zero. The output voltage is mainly influenced by the fundamental wave magnetic field, and in the process that the receiving end moves along with the charging equipment, the induced electromotive force does not have 5 times of harmonic content any more, so that the output voltage of the system is more stable;
(2) Length l of short-range transmitting coil when eliminating 7 th harmonic magnetic field generated on receiving end plane T The design is as follows:
Figure BDA0004019272630000063
wherein m=1, 2,3 … n, n is a positive integer greater than or equal to 1; at the moment, the amplitude of 7 th harmonic of the travelling wave magnetic field in the plane of the receiving coil is 0, and the content of 7 th harmonic in the induced electromotive force of the receiving end is zero. In the process that the receiving end moves along with the charging equipment, the induced electromotive force does not have 7 th harmonic content any more, and the output voltage of the system is more stable;
(3) Length l of short-distance transmitting coil when 5 th harmonic magnetic field and 7 th harmonic magnetic field generated by single-phase transmitting coil are to be restrained simultaneously T The design is as follows:
Figure BDA0004019272630000064
wherein m=1, 2,3 … n, n is a positive integer of 1 or more. At the moment, the 5 th harmonic magnetic field and the 7 th harmonic magnetic field generated by the short-distance transmitting coil on the plane of the receiving end are both suppressed, and the harmonic induction voltage generated in the receiving coil is also suppressed, so that the purpose of suppressing the fluctuation of the output voltage of the system is realized; similarly, when the i-th harmonic component and the i+2-th harmonic component in the magnetic field generated by the single-phase transmitting coil need to be suppressed, the length l of the short-distance transmitting coil T The design is as follows: />
Figure BDA0004019272630000065
Wherein m=1, 2,3 … n, n is a positive integer of 1 or more. At the moment, the short-distance transmitting coil can simultaneously inhibit an i-order harmonic magnetic field and an (i+2) -order harmonic magnetic field generated on the plane of the receiving coil, so that the purpose of inhibiting the fluctuation of the output voltage of the system is realized;
(4) When the magnetic field generated by the single-phase transmitting coil contains i times, (i+2 times, (i+4 times), (i+6 times) times equal harmonic components, the higher the harmonic times are, the smaller the amplitude of harmonic induction voltage generated by the harmonic magnetic field in the receiving coil is, so the length l of the short-distance transmitting coil is T Is selected to suppress low harmonics as the main purpose, the length l of the short-range transmitting coil T The design is as follows:
Figure BDA0004019272630000071
wherein m=1, 2,3 … n, n is a positive integer of 1 or more.
In order to maximize the output voltage in practical application, the length of the transmitting end coil should be close to the pole pitch τ, i.e. m should be selected such that l T As close to the pole pitch tau as possible, since the harmonic order i is oddAnd (3) making:
Figure BDA0004019272630000072
short distance transmitting coil length l T The method comprises the following steps:
Figure BDA0004019272630000073
in application, attention is paid to the winding direction, and the current flow direction of two adjacent rectangles of the short-distance coil needs to be ensured to be consistent.
The foregoing has outlined a detailed description of a short-range transmitting coil structure for a three-phase dynamic wireless power supply system, and specific examples have been presented herein to illustrate the principles and embodiments of the present invention, the above examples being provided only to assist in understanding the method of the present invention and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims (7)

1. A short-distance transmitting coil structure applied to a three-phase dynamic wireless power supply system is characterized in that: in the structure, the single-phase transmitting coil is equivalently regarded as a plurality of coil lengths l T <The rectangular coils of tau are laid in an array along the x-axis direction, and the distance Deltax between two adjacent transmitting coils is equal to the distance Deltax between two adjacent transmitting coils T ＝τ-l T The method comprises the steps of carrying out a first treatment on the surface of the The center distance of two adjacent rectangular coils is tau, and the two adjacent transmitting coils are connected through a wire; by reasonably designing the length l of the short-distance transmitting coil T The harmonic wave traveling wave magnetic field of the transmitting coil on the plane of the receiving end can be eliminated, and the purpose of inhibiting fluctuation of output power in the three-phase dynamic wireless power supply system is achieved.
2. The structure of claim 1, wherein the length of the short-range transmitter coil is T The design method specifically comprises the following steps: with phase A in three-phase short-distance structureFor example, when the coil is fed with a direct current i a ＝I 0 When the phase A coil generates fundamental wave and i-order harmonic magnetic fields on the plane of the receiving end;
for the fundamental magnetic field, the magnetic fields produced by the number 1 and number 2 wires differ in the x-axis direction by (τ -l) T ) Is different in phase by θ 1 Wherein θ is 1 Length of coil l T In relation, satisfy:
Figure FDA0004019272620000011
from the geometrical relationship shown in the magnetic field phasor diagram, the fundamental magnetic field B z-A1 The amplitude of (2) satisfies:
Figure FDA0004019272620000012
wherein N is T Is equivalent to the number of turns of a rectangular coil, B z-1 The amplitude, k, of the fundamental wave travelling wave magnetic field generated at the receiving end for a single coil sT-1 The expression of (2) satisfies:
Figure FDA0004019272620000013
easily-verified k sT-1 Less than or equal to 1, and k is sT-1 Is defined as a fundamental wave short-distance coefficient of the transmitting end and used for representing a fundamental wave magnetic field B after the transmitting end adopts a short-distance coil z-A1 The degree of amplitude decay of (a); wherein the subscript sT represents Short-pitch transmitter coil, namely a Short-distance transmitting coil, and the number represents the harmonic frequency of the travelling wave magnetic field;
similarly, the phase angle theta of the phase difference of the i-order harmonic magnetic field along the x-axis direction generated by the wires with the numbers 1 and 2 can be obtained i The method meets the following conditions:
Figure FDA0004019272620000014
according to the geometrical relationship shown in the magnetic field phasor diagram, the i-order harmonic magnetic field B in the short-distance transmitting coil can be obtained z-Ai The amplitude of (2) satisfies:
Figure FDA0004019272620000015
wherein k is sT-i The expression of (2) satisfies:
Figure FDA0004019272620000021
will k sT-i Is defined as an i-order harmonic short-distance coefficient of the transmitting end, and represents an i-order harmonic magnetic field B after the transmitting end adopts a short-distance coil z-A1 Is a magnitude decay of (a);
to eliminate the i-th harmonic magnetic field B z-A1 ，k sT-i The following should be satisfied: k (k) sT-i =0, solution:
Figure FDA0004019272620000022
/>
in summary, by reasonably designing the length l of the short-distance transmitting coil T The purpose of eliminating the i-order harmonic magnetic field and inhibiting output fluctuation can be achieved.
3. The structure of claim 2, wherein current flow directions of adjacent two rectangular coils of the short-range transmitting coil are identical.
4. The structure of claim 2, wherein the short-range transmitting coil is designed to have a length of
Figure FDA0004019272620000023
Wherein m=1, 2,3 … n, n is a positive integer of 1 or more.
5. The structure according to claim 2, wherein the length of the short-range transmitting coil in the structure is designed to be as follows if the seventh harmonic magnetic field generated by the transmitting coil is eliminated
Figure FDA0004019272620000024
Wherein m=1, 2,3 … n, n is a positive integer of 1 or more.
6. The structure according to claim 2, wherein the length of the short-range transmitting coil in the structure is designed to be as follows in order to simultaneously attenuate the fifth harmonic magnetic field and the seventh harmonic magnetic field generated by the transmitting coil
Figure FDA0004019272620000025
Wherein m=1, 2,3 … n, n is a positive integer of 1 or more.
7. The structure of claim 2, wherein the length of the transmitting coil is close to the pole pitch τ, i.e., m is selected such that l is T As close as possible to the pole pitch τ, since the harmonic order i is odd, the order should be:
Figure FDA0004019272620000026
length of short-range transmit coil T The method comprises the following steps:
Figure FDA0004019272620000027
/>
CN202211680837.6A 2022-12-27 2022-12-27 Short-distance transmitting coil structure applied to three-phase dynamic wireless power supply system Pending CN116131476A (en)

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