CN111641274A - Coupling mechanism applied to wireless power transmission system of electric automobile - Google Patents
Coupling mechanism applied to wireless power transmission system of electric automobile Download PDFInfo
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- CN111641274A CN111641274A CN202010526670.2A CN202010526670A CN111641274A CN 111641274 A CN111641274 A CN 111641274A CN 202010526670 A CN202010526670 A CN 202010526670A CN 111641274 A CN111641274 A CN 111641274A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- 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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention discloses a coupling mechanism applied to a wireless power transmission system of an electric automobile, which comprises a ground power transmitting mechanism consisting of a rectangular end transmitting coil, a ground E-type ferrite and a ground shielding aluminum plate and a vehicle power receiving mechanism consisting of a vehicle square receiving coil, a vehicle E-type ferrite and a vehicle chassis shielding aluminum plate; the method comprises the steps of constructing a wireless power transmission system of the electric automobile, determining circuit simulation parameters of the system, and carrying out comparison analysis on the coupling coefficient change of the traditional coupling mechanism under the working condition of the deviation condition and the length of the litz wire. After the wireless power transmission system is applied to a wireless power transmission system of an electric automobile, the coupling coefficient between two coils can be increased, the use of coil litz wires is reduced, and the system loss is reduced; under the working condition of misalignment of the coupling mechanism, the anti-deviation capability is enhanced, the safety and the stability of the system are improved, the normal work can be still ensured when the deviation is large, and the safety and the reliability of the wireless power transmission system are ensured.
Description
Technical Field
The invention belongs to the technical field of wireless power transmission, and particularly relates to a coupling mechanism applied to a wireless power transmission system of an electric vehicle, which can meet the inductance and coupling coefficient required by the system and reduce the winding length; the anti-offset capability under the working condition of misalignment of the center of the coil is increased, and the stability and the safety of the system are improved.
Background
The wireless power transmission is a safe and convenient power transmission mode, and has the advantages of flexible and convenient use, less maintenance, strong environment adaptability and easy realization. The magnetic coupling resonance type wireless power transmission technology better meets the requirements on distance, efficiency, power, safety and the like, and has wide application prospect in the fields of electric vehicles, consumer electronics, sensors, implantation devices and the like.
The wireless charging system for the electric automobile is analyzed and designed. In an electric vehicle wireless power transmission system, a constant-voltage constant-current charging capability is generally required, and meanwhile, the system should have high transmission efficiency. Due to the large power of the transmitted electric energy, the stability and safety of the system during operation are also considered to be very important.
The traditional coil structure of the coupling mechanism for realizing the wireless charging function of the electric automobile comprises a circular coil, a rectangular coil, a DD coil, a DDQ coil, a BBP coil and the like, wherein a direct-current power supply generates high-frequency alternating current after passing through an inverter, and then the high-frequency alternating current is introduced into an LC resonance circuit consisting of a tuning network and an excitation coil to form sinusoidal alternating current, and meanwhile, a high-frequency alternating magnetic field is formed in the peripheral space of the excitation coil. At the receiving end, the alternating current induced in the load coil flows into the storage battery after rectification and filtering, and the storage battery is charged. However, the traditional coupling mechanism coil with the wireless charging function of the electric automobile does not consider the practical application, the size of the coil at the automobile end is smaller, and the size of the coil at the ground end can be larger, so that the coupling coefficient and the anti-offset capability of the coupling mechanism of the wireless power transmission system are improved. Therefore, a coupling mechanism with a wireless charging function for an electric vehicle, which meets practical application, is needed to ensure that a wireless power transmission system can safely and stably enable a load to receive power and has a higher tolerance under the working condition of misalignment of the center of a coil.
In a wireless power transmission system applied to an electric vehicle, considering practical application, a ground coil is fixed and buried below the ground; the volume of the vehicle-end coil fixed at the bottom of the automobile is limited, so that a user can hardly align the center of the ground-end coil with the center of the vehicle-end coil completely when parking, and when deviation exists, the coupling coefficient of the ground-end coil and the vehicle-end coil can be reduced, so that the charging efficiency is influenced; when the deviation is too large, the electric energy cannot be transmitted normally, and the safety and the stability of the system operation are endangered by the overhigh voltage of the coil at the ground end.
Disclosure of Invention
In order to improve the coupling coefficient, the operation stability and the operation safety of the coupling mechanism applied to the wireless electric energy transmission system of the electric automobile and overcome the defects in the prior art, the invention aims to provide an enhanced coupling mechanism applied to the wireless electric energy transmission system of the electric automobile.
The invention is realized by adopting the following technical scheme:
a coupling mechanism applied to a wireless power transmission system of an electric automobile comprises a ground end power transmitting mechanism and a vehicle end power picking mechanism; the ground electric energy transmitting mechanism comprises a ground rectangular transmitting coil, a ground E-type ferrite and a ground shielding aluminum plate, wherein the centers of the ground rectangular transmitting coil, the ground E-type ferrite and the ground shielding aluminum plate are coaxial and are sequentially arranged from top to bottom; the car end electric energy receiving mechanism comprises a car end square receiving coil, a car end E-type ferrite and a car end chassis shielding aluminum plate, wherein the centers of the car end square receiving coil, the car end E-type ferrite and the car end chassis shielding aluminum plate are coaxial and are sequentially arranged from bottom to top.
The invention has the further improvement that the thickness of the E-type ferrite at the ground end is 1cm, the edge thickness is 1cm, and the height is 7 mm; the thickness of the E-type ferrite at the end of the car is 1cm, the thickness of the edge of the E-type ferrite is 1cm, and the height of the E-type ferrite is 7 mm.
The invention is further improved in that the ground end shielding aluminum plate has the size of 850mm multiplied by 700mm multiplied by 8mm, and the vehicle end chassis shielding aluminum plate has the size of 470mm multiplied by 8 mm.
The invention is further improved in that the vertical distance between the ground-end electric energy transmitting mechanism and the vehicle-end electric energy picking mechanism is 237 mm.
The invention has the further improvement that the ground end rectangular transmitting coil and the vehicle end square receiving coil are wound unevenly by litz wires, the specification of the litz wires is 2500 strands × 0.1mm, 5 turns of the litz wires close to the outer side of the ground end rectangular transmitting coil adopt a close winding form with the distance of 5mm, 11 turns of the litz wires close to the inner side adopt a loose winding form with the distance of 12mm, 5 turns of the litz wires close to the outer side of the vehicle end square receiving coil adopt a close winding form with the distance of 5mm, and 7 turns of the litz wires close to the inner side adopt a loose winding form with the distance of 12 mm.
The invention has at least the following beneficial technical effects:
the invention provides a coupling mechanism applied to a wireless power transmission system of an electric automobile, which comprises a ground power transmitting mechanism and a vehicle power picking mechanism, wherein the ground power transmitting mechanism comprises a ground rectangular transmitting coil, a ground E-type ferrite and a ground shielding aluminum plate, and the centers of the ground rectangular transmitting coil, the ground E-type ferrite and the ground shielding aluminum plate are coaxially and sequentially arranged from top to bottom; the vehicle end electric energy receiving mechanism comprises a vehicle end square receiving coil, a vehicle end E-type ferrite and a vehicle end chassis shielding aluminum plate, and the vehicle end square receiving coil, the vehicle end E-type ferrite and the vehicle end chassis shielding aluminum plate are coaxially and sequentially arranged from bottom to top in the center. The coupling coefficient of the coupling mechanism of the wireless electric energy transmission system of the electric automobile is increased, the charging efficiency is improved, the anti-offset capacity of the coupling mechanism of the wireless electric energy transmission system of the electric automobile is improved, the length of the litz wire used by the coupling mechanism of the wireless electric energy transmission system of the electric automobile is reduced, and the system loss is reduced.
Furthermore, the ground end E-type ferrite and the car end E-type ferrite provide a proper path for magnetic energy, and the coupling coefficient and the anti-offset characteristic between the car end coil and the ground end coil are further improved.
Drawings
Fig. 1(a) is a top view of a ground terminal transmitting mechanism of a coupling mechanism of a wireless power transmission system of an electric vehicle, and fig. 1(b) is a side view of the ground terminal transmitting mechanism of the coupling mechanism of the wireless power transmission system of the electric vehicle.
Fig. 2 (a) is a top view of a vehicle end picking mechanism of a coupling mechanism of a wireless power transmission system of an electric vehicle, and fig. 2 (b) is a side view of the vehicle end picking mechanism of the coupling mechanism of the wireless power transmission system of the electric vehicle.
Fig. 3 is a schematic structural diagram of a wireless power transmission system of an electric vehicle.
FIG. 4 is a fundamental wave approximate equivalent model of a resonant network of the wireless power transmission system of the electric automobile.
Fig. 5 is an equivalent circuit diagram of a resonant network of a wireless power transmission system of an electric vehicle.
Fig. 6 is a model of a coupling mechanism of a wireless power transmission system of an electric vehicle.
FIG. 7 is a coupling coefficient variation curve of the coil of the present invention with lateral shift when the ground-end transmitting mechanism and the vehicle-end pickup mechanism of the wireless power transmission system of the electric vehicle are not aligned; and under the condition of the same output current and the same load, the wireless power transmission system uses a coupling coefficient change curve of the traditional coil along with the transverse deviation.
FIG. 8 is a coupling coefficient variation curve of the coil of the present invention with longitudinal shift when the ground-end transmitting mechanism and the vehicle-end pickup mechanism of the wireless power transmission system of the electric vehicle are not aligned; and under the condition of the same output current and the same load, the wireless power transmission system uses a coupling coefficient change curve of the traditional coil along with longitudinal deviation.
FIG. 9 shows a variation of the coupling coefficient of the wireless power transmission system of the electric vehicle, which deviates in the longitudinal and transverse directions when the ground-end transmitting mechanism and the vehicle-end picking mechanism are not aligned; and under the condition of the same output current and the same load, the wireless power transmission system uses a change curve that the coupling coefficient of the traditional coil has deviation along the transverse direction and the longitudinal direction.
Detailed Description
The present invention will now be described in further detail with reference to the following figures and specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides a coupling mechanism applied to a wireless power transmission system of an electric automobile, which comprises:
1) a ground end transmitting mechanism and a vehicle end picking mechanism structure of a coupling mechanism of a wireless power transmission system of an electric vehicle are designed, wherein the vehicle end picking mechanism is shown in figure 1, and the ground end transmitting mechanism is shown in figure 2. 101 is a vehicle end chassis shielding aluminum plate with the thickness of 8mm, which is used as a shielding layer of the coupling mechanism; in order to reduce the loss of the coupling mechanism and provide a scientific and reasonable channel for magnetic energy, 102 is ferrite with the thickness of 1cm, 1mm is away from a shielding aluminum plate of a chassis at the vehicle end shown by 101, 103 is a litz wire close-wound area used by the pickup mechanism at the vehicle end, 5 turns close to the outer side adopt a close-wound form, 104 is a litz wire loose-wound area used by the pickup mechanism at the vehicle end, and 7 turns close to the inner side adopt a loose-wound form. 201 is a ground shielding aluminum plate with the thickness of 8mm, which is used as a shielding layer of the coupling mechanism; in order to reduce the loss of the coupling mechanism and provide a scientific and reasonable channel for magnetic energy, 202 is ferrite with the thickness of 1cm, 1mm is away from a ground end shielding aluminum plate shown by 201, 203 is a litz wire close-wound area used by a ground end emission mechanism, 5 turns close-wound form is adopted near the outer side, 104 is a litz wire loose-wound area used by a ground section emission mechanism, and 11 turns near the inner side adopt loose-wound form. The specific parameters are shown in table 1; the vertical distance between the ground end launching mechanism and the vehicle end picking mechanism is not less than 230 mm.
Table 1: detailed parameters of coupling mechanism of wireless power transmission system of electric automobile
2) Under ideal circuit conditions, the wireless power transmission system consists of a direct current input power supply, an inverter circuit, a primary side LCC resonant network, a secondary side LCC resonant network, a rectification filter circuit and a load which are connected in sequence, as shown in fig. 3. When the system is operating at the resonant frequency ω, U is shown in FIG. 4p，Lrp，CrpCan be equivalent to a current source and a transmitting coil LpIn series, as shown in the equivalent model of the resonant network in fig. 5. Wherein, UpTo the inverted voltage, Lrp，CrpAnd CpAnd a transmitting loop LpResonant networks, C, which together form the primary sidepCompensation capacitance for the transmitting loop, LrpCompensating inductance for transmitter coil, CrpIs LrpCompensation capacitor of RpIs equivalent parasitic resistance, R, of a primary side resonant networkrpEquivalent parasitic resistance of primary circuit, j omega MIsThe equivalent impedance of the secondary side refracted to the primary side is obtained, and M is the mutual inductance between the transmitting coil and the receiving coil; l isrs，CrsAnd CsAnd a receiving coil LsResonant networks forming together a secondary side, CsFor the compensation capacitance of the receiver coil, LrsCompensating inductance for the receiving coil, CrsIs LrsCompensation capacitor of RsIs the equivalent parasitic resistance, R, of the secondary resonant networkrsEquivalent parasitic resistance of secondary circuit, j omega MIpEquivalent impedance for secondary edge refraction to primary edge, IsFor passing a current of the primary winding of the secondary side, ZleqIs a load impedance, UsIs the load voltage.
IpFor passing through the primary coil with a current of
The secondary side resonant circuit is equivalent to a voltage source Us1Connected to the LCC resonant network. Also according to the Noton's equivalent theorem, Us1，Ls，Cs，CrsCan be equivalent to a current source and a fundamental wave equivalent load ZleqThe series connection is shown in figure 4. Wherein, Us1For receiving the induced voltage of the coil, the load current IrsA size of
M is the mutual inductance of the transmitting coil and the receiving coil, k is the coupling coefficient between the transmitting coil and the receiving coil, obviously, the magnitude of the output current of the resonant network is irrelevant to the load, and when the parameters of the resonant network are determined, the magnitude is only relevant to the magnitude of the input voltage of the resonant network. As shown in fig. 4, according to the symmetry of the double-sided LCC topology, the current I flowing through the primary side compensation inductor can be obtainedrpAnd a load current I flows throughsIs composed of
Wherein: i issFor the current flowing through the primary coil on the secondary side, j is an imaginary unit, RleqIs the real part of the reflected impedance of the load, XleqTo reverse the loadThe imaginary part of the radio impedance.
3) As shown in fig. 6, which is a simulation model of a coupling mechanism of a wireless power transmission system of an electric vehicle, 101 is a 8mm thick aluminum shielding plate of a chassis at the vehicle end, and is used as a shielding layer of the coupling mechanism; in order to reduce the loss of the coupling mechanism and provide a scientific and reasonable channel for magnetic energy, 102 is ferrite with the thickness of 1cm, 1mm is away from a shielding aluminum plate of a chassis at the vehicle end shown by 101, 103 is a litz wire close-wound area used by the pickup mechanism at the vehicle end, 5 turns close-wound form is adopted near the outer side, 104 is a litz wire loose-wound area used by the pickup mechanism at the vehicle end, and 7 turns near the inner side adopt loose-wound form. 201 is a ground shielding aluminum plate with the thickness of 8mm, which is used as a shielding layer of the coupling mechanism; in order to reduce the loss of the coupling mechanism and provide a scientific and reasonable channel for magnetic energy, 202 is ferrite with the thickness of 1cm, 1mm is away from a ground end shielding aluminum plate shown by 201, 203 is a litz wire close-wound area used by a ground end emission mechanism, 5 turns close-wound form is adopted near the outer side, 104 is a litz wire loose-wound area used by a ground section emission mechanism, and 11 turns near the inner side adopt loose-wound form; the vertical distance between the ground end coupling mechanism and the vehicle end coupling mechanism is not less than 230 mm.
4) Fig. 7(a) shows the situation that the coupling coefficient changes with the lateral shift when the wireless power transmission system of the electric vehicle designed by the present invention works under the working condition of the misalignment of the coil; fig. 7(b) shows a situation that a coupling coefficient of a conventional wireless power transmission system for an electric vehicle changes with lateral deviation when a coil works in a misaligned working condition; the coupling mechanism adopted by comparison is a coil with the same size and dimension of the ground end coil and the vehicle end coil.
5) Fig. 8(a) shows the situation that the coupling coefficient changes with longitudinal deviation when the wireless power transmission system of the electric vehicle designed by the present invention works under the working condition of coil misalignment; fig. 8(b) shows a situation that the coupling coefficient changes with longitudinal deviation when the conventional wireless power transmission system for an electric vehicle operates under a condition that the coil is not aligned; the coupling mechanism adopted by comparison is a coil with the same size and dimension of the ground end coil and the vehicle end coil.
6) Fig. 9(a) shows the variation of the coupling coefficient with the deviation in the transverse and longitudinal directions when the wireless power transmission system of the electric vehicle designed by the present invention works under the working condition of the misalignment of the coil; fig. 9(b) shows a variation of the coupling coefficient of the conventional wireless power transmission system of the electric vehicle, which deviates in the transverse and longitudinal directions when the coil is not aligned with the working condition; the coupling mechanism adopted by comparison is a coil with the same size and dimension of the ground end coil and the vehicle end coil. The designed enhanced coil structure applied to the wireless power transmission system of the electric automobile can still ensure normal power supply of the electric automobile when a user is not completely aligned with the center of the ground end coil and the center of the automobile end coil during parking, so that the electric automobile can normally work.
7) Table 2 shows the litz wire length contrast between the enhanced coil designed by the present invention and the conventional coil when the ground end coil and the car end coil of the coupling mechanism have the same size.
Table 2: the coupling mechanism of the wireless electric energy transmission system of the electric automobile designed by the invention is compared with the traditional coupling mechanism by using the length condition of the litz wire
During simulation, system parameters of the wireless power transmission system of the electric automobile are determined, the output power is 11kW, the input voltage is 400-750V, the primary coil current effective value is 27A, the secondary coil effective value is 70A, and the output voltage is 350V. The primary coil inductance is 250 muH, the secondary coil inductance is 90uH, and the coupling coefficient is more than 0.17, so that the wireless electric energy transmission system of the electric automobile has the efficiency of more than 92.5 percent.
And step 3: and determining circuit simulation parameters according to the system parameters, designing a model for enhancing the coupling coefficient coil by using Maxwell software, and simulating the working condition of the coil when the coil is deviated.
From the simulation results obtained (85 kHz for example), the following conclusions can be drawn:
(1) according to the invention, the coupling coefficient of the coupling mechanism of the wireless electric energy transmission system of the electric automobile is increased, and the charging efficiency is improved;
(2) the anti-offset capability of the coupling mechanism of the wireless power transmission system of the electric automobile is improved;
(3) the length of a litz wire used by a coupling mechanism of the wireless electric energy transmission system of the electric automobile is reduced, and the system loss is reduced.
Claims (5)
1. A coupling mechanism applied to a wireless power transmission system of an electric automobile is characterized by comprising a ground end power transmitting mechanism and a vehicle end power picking mechanism; the ground electric energy transmitting mechanism comprises a ground rectangular transmitting coil, a ground E-type ferrite and a ground shielding aluminum plate, wherein the centers of the ground rectangular transmitting coil, the ground E-type ferrite and the ground shielding aluminum plate are coaxial and are sequentially arranged from top to bottom; the car end electric energy receiving mechanism comprises a car end square receiving coil, a car end E-type ferrite and a car end chassis shielding aluminum plate, wherein the centers of the car end square receiving coil, the car end E-type ferrite and the car end chassis shielding aluminum plate are coaxial and are sequentially arranged from bottom to top.
2. The coupling mechanism applied to the wireless power transmission system of the electric automobile according to claim 1, wherein the thickness of the E-type ferrite at the ground end is 1cm, the thickness of the edge is 1cm, and the height is 7 mm; the thickness of the E-type ferrite at the end of the car is 1cm, the thickness of the edge of the E-type ferrite is 1cm, and the height of the E-type ferrite is 7 mm.
3. The coupling mechanism applied to the wireless power transmission system of the electric automobile according to claim 1, wherein the ground shielding aluminum plate has a size of 850mm x 700mm x 8mm, and the vehicle chassis shielding aluminum plate has a size of 470mm x 8 mm.
4. The coupling mechanism applied to the wireless power transmission system of the electric automobile according to claim 1, wherein the vertical distance between the ground-end power transmitting mechanism and the vehicle-end power pick-up mechanism is 237 mm.
5. The coupling mechanism applied to the wireless power transmission system of the electric automobile according to claim 1, wherein the ground-end rectangular transmitting coil and the vehicle-end square receiving coil are wound unevenly by litz wires, the litz wire specification is 2500 strands by 0.1mm, the outer 5 turns of litz wires of the ground-end rectangular transmitting coil adopt a close-wound form with a distance of 5mm, the inner 11 turns of litz wires adopt a loose-wound form with a distance of 12mm, the outer 5 turns of litz wires of the vehicle-end square receiving coil adopt a close-wound form with a distance of 5mm, and the inner 7 turns of litz wires adopt a loose-wound form with a distance of 12 mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117834A (en) * | 2020-10-14 | 2020-12-22 | 天津工业大学 | Magnetic coupling mechanism suitable for wireless power transmission between rocket and ground and design method |
| CN114336996A (en) * | 2022-01-28 | 2022-04-12 | 上海电机学院 | Magnetic coupling structure of dynamic wireless power supply system of electric automobile |
| CN115276256A (en) * | 2022-07-18 | 2022-11-01 | 广西电网有限责任公司电力科学研究院 | Bidirectional MC-WPT system and constant-current output phase-shifting control method thereof |
| CN115284900A (en) * | 2022-07-22 | 2022-11-04 | 广西电网有限责任公司电力科学研究院 | Foldable wireless electric energy receiving mechanism and wireless car that charges |
| CN115313670A (en) * | 2022-07-18 | 2022-11-08 | 广西电网有限责任公司电力科学研究院 | Magnetic coupling mechanism of bidirectional MC-WPT system and parameter design method thereof |
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| CN112117834A (en) * | 2020-10-14 | 2020-12-22 | 天津工业大学 | Magnetic coupling mechanism suitable for wireless power transmission between rocket and ground and design method |
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| CN115313670A (en) * | 2022-07-18 | 2022-11-08 | 广西电网有限责任公司电力科学研究院 | Magnetic coupling mechanism of bidirectional MC-WPT system and parameter design method thereof |
| CN115313670B (en) * | 2022-07-18 | 2023-05-09 | 广西电网有限责任公司电力科学研究院 | Magnetic coupling mechanism of bidirectional MC-WPT system and parameter design method thereof |
| CN115276256B (en) * | 2022-07-18 | 2023-08-08 | 广西电网有限责任公司电力科学研究院 | Bidirectional MC-WPT system and constant-current output phase-shifting control method thereof |
| CN115284900A (en) * | 2022-07-22 | 2022-11-04 | 广西电网有限责任公司电力科学研究院 | Foldable wireless electric energy receiving mechanism and wireless car that charges |
| CN115284900B (en) * | 2022-07-22 | 2024-05-28 | 广西电网有限责任公司电力科学研究院 | Folding wireless electric energy receiving mechanism and wireless car that charges |
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