CN113635790A - Electric automobile wheel hub motor wireless power transmission system based on coil structure under spring - Google Patents
Electric automobile wheel hub motor wireless power transmission system based on coil structure under spring Download PDFInfo
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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
- 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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- 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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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from 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
- Y02T10/70—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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Abstract
The invention provides an electric automobile hub motor wireless power transmission system based on a coil under spring structure, wherein a power electronic module assembly of the transmission system is in signal connection with a receiving end of a magnetic coupling mechanism, the receiving end of the magnetic coupling mechanism is connected to the lower end of the inner side of a hub motor through a connecting support, the receiving end of the magnetic coupling mechanism is arranged below a transmitting end of the magnetic coupling mechanism, the power electronic module assembly is arranged on the periphery of a transmission shaft of the hub motor, and the transmitting end of the magnetic coupling mechanism is embedded and arranged on the surface of a road. The invention solves the technical problems of limitation, low interoperability and narrow application scene and application range of the design scheme of the magnetic coupling mechanism of the traditional electric vehicle wireless charging system, and the invention adopts the planar magnetic coupling mechanism arranged below the suspension spring of the electric vehicle, so that the minimum clearance distance between the transmitting end and the receiving end of the magnetic coupling mechanism can be realized, and the wireless electric energy transmission system provided by the invention has the advantages of high efficiency, good road adaptability and the like.
Description
Technical Field
The invention relates to a wireless power transmission system of an electric automobile hub motor based on a coil under spring structure, and belongs to the technical field of wireless power transmission of electric automobiles.
Background
The hub motor is a novel motor which integrates a power system, a transmission system and a brake system of an electric automobile into a hub. The hub motor with the driving system installed inside the wheel further promotes the integration, miniaturization and light design of the motor driving system. The wheel hub motor is used as a driving solution of a future new energy automobile, and has the biggest characteristic that driving, transmission and braking devices are integrated into a wheel hub, transmission parts such as a clutch, a speed changer, a transmission shaft, a differential mechanism and a transfer case are omitted, direct driving in a real sense can be achieved, full-time four-wheel driving can be easily achieved, and driving efficiency improvement and vehicle space expansion are made possible.
However, the conventional hub motor is powered by a cable or a contact slip ring, so that potential safety hazards such as abrasion, aging, cable loosening, short circuit, electric leakage and the like easily exist under the condition that the motor rotates at a high speed or is used for a long time, and a great deal of adverse effects are brought to driving safety. In summary, the invention is needed to provide a wireless power transmission system applied to an electric automobile hub motor, which gets rid of the design constraint brought by the traditional cable power supply and realizes the non-contact efficient power supply.
In the hub motor wireless power supply system in the prior art, a magnetic coupling mechanism is adopted as a side-mounted planar coil, and the structure does not carefully consider the influence of a wheel axle between the hub motor and a vehicle body on the distribution of a magnetic coupling resonance electromagnetic field, so that the practical application and implementation of the hub motor wireless power supply system are seriously limited, and the energy transfer efficiency is very low; in addition, the power supply to the hub motor is realized by the vehicle-mounted battery in the scheme, the problem of the electric energy source of the electric automobile driving system is not really solved, and the electric energy supply of the vehicle-mounted battery of the electric automobile still needs to be considered. In conclusion, the magnetic coupling mechanism scheme of the existing scheme has serious limitations and low interoperability, and the application scenario and the application range are narrow.
Disclosure of Invention
The invention provides an electric automobile hub motor wireless electric energy transmission system based on a coil under spring structure, aiming at solving the technical problems that the magnetic coupling mechanism scheme of the existing scheme has serious limitation and low interoperability and has narrow application scene and application range, the invention adopts a planar magnetic coupling mechanism arranged below a suspension spring of an electric automobile to minimize the transmitting and receiving gap distance of the magnetic coupling mechanism, and provides application cases applied to static wireless electric energy transmission, semi-dynamic wireless electric energy transmission and dynamic wireless electric energy transmission aiming at the scheme.
The invention provides an electric automobile hub motor wireless power transmission system based on a coil under spring structure, which comprises a magnetic coupling mechanism transmitting end, a magnetic coupling mechanism receiving end, a power electronic module assembly, a shielding shell and a connecting support, wherein the power electronic module assembly is in signal connection with the magnetic coupling mechanism receiving end, the magnetic coupling mechanism receiving end is connected to the lower end of the inner side of a hub motor through the connecting support, the magnetic coupling mechanism receiving end is arranged below the magnetic coupling mechanism transmitting end, the power electronic module assembly is arranged on the periphery of a transmission shaft of the hub motor, and the magnetic coupling mechanism transmitting end is embedded and arranged on the surface of a road.
Preferably, the power electronic module assembly comprises a direct current constant voltage source, an inverter, a driver, a primary side controller, a rectifier, a secondary side controller and a voltage reduction and stabilization module, the in-wheel motor is sequentially connected with the voltage reduction and stabilization module, the rectifier and the secondary side controller, the rectifier is further sequentially connected with the secondary side resonance unit and the receiving end of the magnetic coupling mechanism, the voltage reduction and stabilization module is further sequentially connected with the lithium battery pack, the direct current constant voltage source, the inverter, the driver and the primary side controller are sequentially connected, and the inverter is further sequentially connected with the primary side resonance unit and the transmitting end of the magnetic coupling mechanism.
Preferably, the primary side controller and the secondary side controller both comprise a current sensor, a modulation and demodulation module, a PI control module and a Wi-Fi communication module, and are used for realizing constant voltage and constant current control and maximum efficiency tracking control of the system.
Preferably, a shielding shell is installed at the outer side of the hub motor.
Preferably, the transmitting end of the magnetic coupling mechanism comprises a transmitting end coil and a transmitting end magnetic core, and the transmitting end magnetic core is laid below the transmitting end coil.
Preferably, the transmitting end coil is designed to be square, round, DD, DDQ, three-phase stacked, multi-small coil, long guide rail or bipolar.
Preferably, the receiving end of the magnetic coupling mechanism is of a planar structure, and comprises a receiving end coil and a receiving end magnetic core, and the receiving end coil is arranged on the receiving end magnetic core.
Preferably, the receiving end coil is designed to be square, circular, DD, DDQ, or three-phase stacked.
Preferably, the primary side resonance unit is located inside a transmitting end coil of the magnetic coupling mechanism, and the secondary side resonance unit is located inside a receiving end coil of the magnetic coupling mechanism. And the primary side resonance unit and the secondary side resonance unit adopt a compensation network which accords with circuit topology interoperability.
Preferably, the compensation network is S-S, S-P, P-P, P-S, LCC-S, LCC-LCC, LCL-LCL, LCL-S or other complex high-order topologies.
The wireless power transmission system of the hub motor of the electric automobile based on the unsprung coil structure has the beneficial effects that:
1. the structure of the invention can realize smaller ground clearance than the traditional wireless charging system of the electric automobile, is superior to the existing national standard or SAE-J2954 international standard, and is easier to realize the high transmission efficiency design of the system.
2. The unsprung coil structure is arranged at the edge position of a suspension spring of the hub motor, as shown in fig. 2, when a complex road condition is passed, the receiving end of the magnetic coupling mechanism ascends or descends along with the suspension, so that the receiving end is not easily scratched by the influence of roadside, and compared with the traditional wireless charging system for the electric automobile, the unsprung coil structure has good road adaptability and trafficability.
3. The wireless power transmission system of the hub motor of the electric automobile based on the unsprung coil structure, which is designed by the invention, can be expanded and applied to the field of static, quasi-dynamic and dynamic wireless power supply, is specifically shown in implementation cases I, II, III and IV, and has wide application prospect.
4. The receiving end coil of the electric automobile hub motor wireless power transmission system based on the unsprung coil structure can be designed into square, round, DD type, DDQ type, three-phase stacking type and other integrated coil structure forms, the transmitting end coil can be designed into square, round, DD type, DDQ type, three-phase stacking type, multiple small coil types, long guide rail type, bipolar type and other integrated coil structure forms, and the transmitting end coil and the receiving end coil can be selected from structures with interoperability to be matched at will, so that the electric automobile hub motor wireless power transmission system based on the unsprung coil structure has strong interoperability and expanded design universality.
5. According to the invention, the unsprung coil (receiving end coil) is directly arranged on the vehicle body suspension, the receiving end power electronic module assembly is integrated on the side part of the hub motor, the shortest design of a power supply line is realized, unnecessary line loss is reduced, electric energy obtained by coupling of the receiving end of the magnetic coupling mechanism can directly supply power for the hub motor driving module and the sensor module, and redundant electric energy can be stored in the lithium battery pack.
6. The unsprung coil structure is arranged on the inner side of a wheel, a spoke-shaped metal wheel hub (usually made of aluminum alloy or steel) can shield a space electromagnetic field generated by a magnetic coupling mechanism, the electromagnetic field intensity on the outer side of the wheel is tested to be lower than 27uT in a simulation mode, the maximum radiation value of a human body required in an ICNRP guide is met, and therefore the space magnetic field of the wireless power transmission magnetic coupling mechanism cannot cause harm to the human body in the process of getting on and off.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic circuit diagram of a power electronic module assembly according to the present invention;
FIG. 2 is a schematic circuit diagram of a primary side controller according to the present invention;
FIG. 3 is a schematic view of an assembled structure of an unsprung coil based magnetic coupling mechanism;
FIG. 4 is a front view of an unsprung coil based magnetic coupling mechanism;
FIG. 5 is a schematic view of an unsprung coil based magnetic coupling mechanism;
fig. 6 is a schematic view of a static wireless power supply principle of an indoor/outdoor parking space of a hub motor according to embodiment 1;
fig. 7 is a schematic diagram of a semi-dynamic wireless power supply principle at a traffic light intersection of a hub motor according to embodiment 2;
fig. 8 is a schematic diagram of a semi-dynamic wireless power supply principle of a bus stop with a hub motor according to embodiment 3;
fig. 9 is a schematic view of a dynamic wireless power supply principle of the hub motor highway or the urban expressway according to embodiment 4;
the system comprises a direct current constant voltage source 1, an inverter 2, a driver 3, a primary side controller 4, a primary side resonance unit 5, a magnetic coupling mechanism transmitting end 6, a magnetic coupling mechanism receiving end 7, a secondary side resonance unit 8, a rectifier 9, a secondary side controller 10, a voltage reduction and stabilization module 11, a hub motor 12, a lithium battery pack 13, a power electronic assembly 14, a shielding shell 15, a tire 16, a transmission shaft 17, a connecting support 18 and a suspension spring 19.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: this embodiment is described with reference to fig. 1 to 9. This embodiment electric automobile wheel hub motor wireless power transmission system based on coil structure under spring, including power electronic module assembly 14, linking bridge 18 and magnetic coupling mechanism transmitting terminal 6, magnetic coupling mechanism receiving terminal 7, power electronic module assembly 14 and magnetic coupling mechanism transmitting terminal 6, magnetic coupling mechanism receiving terminal 7 signal connection, magnetic coupling mechanism transmitting terminal 6 passes through linking bridge 18 and connects in the inboard lower extreme of in-wheel motor 12, magnetic coupling mechanism transmitting terminal 6 installs in the below of magnetic coupling mechanism receiving terminal 7, power electronic module assembly 14 installs in the periphery of the transmission shaft 17 of in-wheel motor 12. The transmission shaft 17 is connected with the chassis of the electric automobile through a suspension spring 19. And a shielding shell 15 is arranged on the outer side of the in-wheel motor 12.
The power electronic module assembly 14 comprises a direct-current constant-voltage source 1, an inverter 2, a driver 3, a primary side controller 4, a rectifier 9, a secondary side controller 10 and a voltage-reducing and voltage-stabilizing module 11, the in-wheel motor 12 is sequentially connected with the voltage-reducing and voltage-stabilizing module 11, the rectifier 9 and the secondary side controller 10, the rectifier 9 is further sequentially connected with a secondary side resonance unit 8 and a magnetic coupling mechanism receiving end 7, the voltage-reducing and voltage-stabilizing module 11 is further sequentially connected with a lithium battery pack 13, the direct-current constant-voltage source 1, the inverter 2, the driver 3 and the primary side controller 4 are sequentially connected, and the inverter 2 is further sequentially connected with a primary side resonance unit 5 and a magnetic coupling mechanism transmitting end 6. The in-wheel motor 12 includes a motor drive module 12-1 and a sensor module 12-2.
The inverter 2 is used for realizing DC-AC conversion, the driver 3 is used for generating driving signals to drive four paths of MOSFET switching tubes in the inverter 2, the primary and secondary resonant units 5 and 8 and the magnetic coupling mechanism 6 are matched to form a magnetic coupling resonant cavity for generating a space alternating magnetic field so as to realize wireless transmission of energy, and the rectifier 9 is used for realizing AC-DC conversion and realizing DC-DC direct current conversion through the voltage reduction and stabilization module 11 so as to realize driving of the hub motor 12 and energy storage of the lithium battery 13. The primary side controller 4 and the secondary side controller 10 both comprise a current sensor 4-1, a modulation and demodulation module 4-2, a PI control module 4-3 and a Wi-Fi communication module 4-4, and are used for realizing constant voltage and constant current control and maximum efficiency tracking control of the system. The primary and secondary resonant cells 5 and 8 may employ any form of compensation network consistent with circuit topology interoperability including, but not limited to, S-S, S-P, P-P, P-S, LCC-S, LCC-LCC, LCL-LCL, LCL-S or other complex high order topologies. The parts are wrapped by a non-metal shell, and the materials can be PLA, ABS or PMMA.
The direct current passes through the inverter 2 and then passes through the resonant cavity to convert the electric energy into a high-frequency alternating magnetic field, so that alternating current with the same frequency is generated in a receiving end of the magnetic coupling mechanism in a coupling mode, and then the alternating current is rectified, reduced in voltage and stabilized in voltage to be converted into a voltage and current parameter grade suitable for driving of the hub motor and energy storage of the lithium battery, and therefore non-contact wireless transmission of the electric energy is achieved.
The transmitting end 6 of the magnetic coupling mechanism comprises a transmitting end coil 6-1 and a transmitting end magnetic core 6-2, and the transmitting end magnetic core 6-2 is positioned on the lower side of the transmitting end coil 6-1.
The transmitting end coil 6-1 can be designed into a square type, a round type, a DD type, a DDQ type, a three-phase stacked type, a multi-small coil type, a long guide rail type, a bipolar type and other integrated coil structure forms.
The receiving end 7 of the magnetic coupling mechanism is of a planar structure, the magnetic coupling receiving end 7 comprises a receiving end coil 7-1 and a receiving end magnetic core 7-2, and the receiving end coil 7-1 is arranged on the receiving end magnetic core 7-2.
The receiving end coil 7-1 can be designed into a square type, a round type, a DD type, a DDQ type, a three-phase stacked type and other integrated coil structure forms.
The transmitting end coil and the receiving end coil can be matched arbitrarily by selecting a structure with interoperability, and have strong interoperability and expanded design universality.
The primary side resonance unit 5 is located on the inner side of a transmitting end coil 6-1 of the magnetic coupling mechanism, and the secondary side resonance unit 8 is located on the inner side of a receiving end coil 6-2 of the magnetic coupling mechanism.
The hub motor 12 is positioned inside a tire 16, a power electronic module assembly 14 is arranged on the side surface of the hub motor, and a transmission shaft 17 is connected with the chassis of the electric automobile through a suspension spring 19. The transmitting end 6 of the magnetic coupling mechanism is arranged on the inner side of the tire, and the shielding shell 15 is arranged outside the tire and used for shielding a space electromagnetic field generated in the vertical direction of the magnetic coupling mechanism. As can be seen from fig. 2, the receiving end 7 of the magnetic coupling mechanism is mounted on the connecting bracket 18 led out from the inner housing of the hub motor 12 of the electric vehicle, but does not rotate with the rotation of the hub motor, which is the biggest difference compared with the conventional wireless power transmission system of the electric vehicle and is one of the key protection points of the present patent, and through the integrated design of the hub motor 12, the power electronic module assembly 14 and the magnetic coupling mechanisms 6 and 7, the wireless power transmission system of the present invention has the advantages of high efficiency, good road adaptability, etc.
Example 1:
referring to fig. 6, the embodiment is specifically described, and the wireless power transmission system of the hub motor of the electric vehicle based on the unsprung coil structure is mainly applied to the field of static wireless charging of the electric vehicle. The application object of this embodiment is an electric vehicle parked in a fixed parking space, the size of the transmitting end of the magnetic coupling mechanism is 800mm × 400mm, 22 turns are wound by using 0.05 × 3000 grazis wires, the size of the receiving end of the magnetic coupling mechanism is 220mm × 220mm, and 14 turns are wound by using 0.05 × 3000 grazis wires. Wherein, one set of magnetic coupling mechanism can realize 5 kW's maximum power output, and the four wheel hubs of whole car can realize 20 kW's maximum power output ability altogether. In addition, as can be seen from fig. 5, since the size of the transmitting end is larger than that of the receiving end in both the length direction and the width direction, the magnetic coupling mechanism based on the coil under spring structure provided by the invention has good offset adaptability, and even when the parking position is not completely located in the center of the parking area, the system can still realize derating operation as long as the two sides of the magnetic coupling mechanism contain coverage areas. The transmitting end coil 6-1 of the magnetic coupling mechanism of the electric automobile hub motor wireless power transmission system based on the unsprung coil structure can be designed into square, round, DD, DDQ and other integrated coil structure forms; the receiving end coil 7-1 of the magnetic coupling mechanism can be designed into a square type, a round type, a DD type, a DDQ type, a three-phase stacking type and other integrated coil structure forms; the coils of the transmitting end and the receiving end can be selected to be matched with each other at will, and the primary side resonant network and the secondary side resonant network can adopt any form of compensation network conforming to the interoperability of circuit topology, including but not limited to S-S, S-P, P-P, P-S, LCC-S, LCC-LCC, LCL-LCL, LCL-S or other complex high-order topological structures.
Example 2:
referring to fig. 7, the embodiment is specifically described, and the wireless power transmission system for the hub motor of the electric vehicle based on the unsprung coil structure is mainly applied to the field of semi-dynamic wireless charging of the electric vehicle. The application object of the embodiment is an electric automobile which stops at a road intersection and waits for a signal lamp, the size of the transmitting end of the magnetic coupling mechanism is 1000mm × 400mm, 22 turns are wound by adopting 0.05 × 3000 grazis wires, the size of the receiving end of the magnetic coupling mechanism is 220mm × 220mm, and 14 turns are wound by adopting 0.05 × 3000 grazis wires. Wherein, one set of magnetic coupling mechanism can realize 5 kW's maximum power output, and the four wheel hubs of whole car can realize 20 kW's maximum power output ability altogether.
Unlike embodiment 1, the present embodiment considers short-time parking charging, i.e., semi-dynamic wireless power transmission, applied to an intersection of road traffic. Through relevant research and big data calculation, a magnetic coupling mechanism transmitting coil is laid in a 20 m-30 m parking area of an urban main road or other traffic light intersections with large traffic flow, as shown in fig. 6, and the advantages of the embodiment can be realized to the greatest extent. Because the alternating time of the traffic lights of the main road at home is about 2 minutes, the endurance mileage replenishment of about 2.6km can be realized when waiting at one intersection at the charging endurance mileage rate of 80km/h of the current 20kW wireless charging system, and the driving is completely enough to continue the power replenishment in the next charging area.
In addition, as can be seen from fig. 7, since the size of the transmitting end is larger than that of the receiving end in both the length direction and the width direction, the magnetic coupling mechanism based on the coil under spring structure provided by the invention has good offset adaptability, and even when the parking position is not completely located in the center of the parking area, the system can still realize derating operation as long as the two sides of the magnetic coupling mechanism contain coverage areas. The transmitting end coil 6-1 of the magnetic coupling mechanism of the electric automobile hub motor wireless power transmission system based on the unsprung coil structure can be designed into square, round, DD, DDQ and other integrated coil structure forms; the receiving end coil 7-1 of the magnetic coupling mechanism can be designed into a square type, a round type, a DD type, a DDQ type, a three-phase stacking type and other integrated coil structure forms; the coils of the transmitting end and the receiving end can be selected to be matched with each other at will, and the primary side resonant network and the secondary side resonant network can adopt any form of compensation network conforming to the interoperability of circuit topology, including but not limited to S-S, S-P, P-P, P-S, LCC-S, LCC-LCC, LCL-LCL, LCL-S or other complex high-order topological structures.
Example 3:
referring to fig. 8, the embodiment is specifically described, and the wireless power transmission system for the hub motor of the electric vehicle based on the unsprung coil structure is mainly applied to the field of semi-dynamic wireless charging of the electric vehicle. The application object of the embodiment is an electric automobile which is parked in a special parking space of a bus to wait for passengers to get on or off the bus, the size of the transmitting end of the magnetic coupling mechanism is 1000mm x 400mm, 22 turns are wound by adopting 0.05 x 3000 stranded litz wires, the size of the receiving end of the magnetic coupling mechanism is 220mm x 220mm, and 14 turns are wound by adopting 0.05 x 3000 stranded litz wires. Wherein, one set of magnetic coupling mechanism can realize 5 kW's maximum power output, and the four wheel hubs of whole car can realize 20 kW's maximum power output ability altogether.
Similar to the embodiment, the embodiment considers the short-time parking charging applied to the bus stop, namely, the semi-dynamic wireless power transmission. The magnetic coupling mechanism transmitting coil is laid in the bus-dedicated parking area, as shown in fig. 7, so that the advantages of the embodiment can be realized to the greatest extent. As the average stop time of the domestic middle and large-sized buses is about 40 seconds, about 1km of cruising mileage can be replenished when waiting at one intersection at the charging cruising mileage rate of 80km/h of the current 20kW wireless charging system, and the vehicles can be driven to the next charging area to continue to replenish electricity.
In addition, as can be seen from fig. 8, since the size of the transmitting end is larger than that of the receiving end in both the length direction and the width direction, the magnetic coupling mechanism based on the coil under spring structure provided by the invention has good offset adaptability, and even when the parking position is not completely located in the center of the parking area, the system can still realize derating operation as long as the two sides of the magnetic coupling mechanism contain coverage areas. The transmitting end coil 6-1 of the magnetic coupling mechanism of the electric automobile hub motor wireless power transmission system based on the unsprung coil structure can be designed into square, round, DD, DDQ and other integrated coil structure forms; the receiving end coil 7-1 of the magnetic coupling mechanism can be designed into a square type, a round type, a DD type, a DDQ type, a three-phase stacking type and other integrated coil structure forms; the coils of the transmitting end and the receiving end can be selected to be matched with each other at will, and the primary side resonant network and the secondary side resonant network can adopt any form of compensation network conforming to the interoperability of circuit topology, including but not limited to S-S, S-P, P-P, P-S, LCC-S, LCC-LCC, LCL-LCL, LCL-S or other complex high-order topological structures.
Example 4:
referring to fig. 9, the embodiment is specifically described, and the wireless power transmission system for the hub motor of the electric vehicle based on the unsprung coil structure is mainly applied to the field of dynamic wireless charging of the electric vehicle. The application object of the embodiment is an electric automobile running on an expressway or an urban expressway, the size of a transmitting end of the magnetic coupling mechanism is 1000mm x 400mm by adopting a dynamic wireless power transmission sectional type guide rail structure, the magnetic coupling mechanism is wound by 0.05 x 3000 gratzian wires, the size of a receiving end of the magnetic coupling mechanism is 220mm x 220mm, and 14 turns of the magnetic coupling mechanism are wound by 0.05 x 3000 gratzian wires. Wherein, one set of magnetic coupling mechanism can realize 5 kW's maximum power output, and the four wheel hubs of whole car can realize 20 kW's maximum power output ability altogether.
Different from the above embodiments, the present embodiment considers a dynamic wireless power transmission scenario applied to an electric vehicle on an expressway or an urban expressway, and lays a magnetic coupling mechanism transmitting coil on a expressway, as shown in fig. 9, so that the advantages of the present embodiment can be achieved to the greatest extent. The transmitting end of the dynamic wireless guide rail adopts a sectional type structure, when a vehicle runs to be close to the guide rail of the magnetic coupling transmitting end, the guide rail automatically starts a charging mode in advance, and is closed after time lag when the vehicle leaves the guide rail, so that the problems of overcurrent impact and the like caused by dynamic running can be avoided to a great extent. The dynamic identification of the transmitting end and the receiving end can be realized by means of radio frequency, Wi-Fi, Bluetooth, laser radar and the like, and the high-precision segmental guide rail switching control can be realized.
In addition, as can be seen from fig. 9, since the size of the transmitting end is larger than that of the receiving end in both the length direction and the width direction, the magnetic coupling mechanism based on the coil under spring structure provided by the invention has good offset adaptability, and even when the parking position is not completely located in the center of the parking area, the system can still realize derating operation as long as the two sides of the magnetic coupling mechanism contain coverage areas. The transmitting end coil 6-1 of the magnetic coupling mechanism of the electric automobile hub motor wireless power transmission system based on the unsprung coil structure can be designed into a three-phase stacked type, a multi-small coil type, a long guide rail type, a bipolar type and other dynamic guide rail forms; the receiving end coil 7-1 of the magnetic coupling mechanism can be designed into a square type, a round type, a DD type, a DDQ type, a three-phase stacking type and other integrated coil structure forms; the coils of the transmitting end and the receiving end can be selected to be matched with each other at will, and the primary side resonant network and the secondary side resonant network can adopt any form of compensation network conforming to the interoperability of circuit topology, including but not limited to S-S, S-P, P-P, P-S, LCC-S, LCC-LCC, LCL-LCL, LCL-S or other complex high-order topological structures.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an electric automobile wheel hub motor wireless power transmission system based on coil structure under spring, its characterized in that, includes power electronic module assembly (14), linking bridge (18), magnetic coupling mechanism transmitting terminal (6) and magnetic coupling mechanism receiving terminal (7), power electronic module assembly (14) and magnetic coupling mechanism transmitting terminal (6) and magnetic coupling mechanism receiving terminal (7) signal connection, magnetic coupling mechanism receiving terminal (7) are connected in the inboard shell of electric automobile wheel hub motor (12) through linking bridge (18), but do not rotate along with wheel hub motor (12), the below in magnetic coupling mechanism receiving terminal (7) is installed in magnetic coupling mechanism transmitting terminal (6), power electronic module assembly (14) are installed in the periphery of transmission shaft (17) of wheel hub motor (12).
2. The electric automobile hub motor wireless power transmission system based on unsprung coil structure according to claim 1, characterized in that the power electronic module assembly (14) includes a dc constant voltage source (1), an inverter (2), a driver (3), a primary side controller (4), a rectifier (9), a secondary side controller (10) and a buck voltage stabilizing module (11), the hub motor (12) is sequentially connected with the buck voltage stabilizing module (11), the rectifier (9) and the secondary side controller (10), the rectifier (9) is further sequentially connected with a secondary side resonance unit (8) and a magnetic coupling mechanism receiving end (7), the buck voltage stabilizing module (11) is further sequentially connected with a lithium battery pack (13), the dc constant voltage source (1), the inverter (2), the driver (3) and the primary side magnetic coupling controller (4) are sequentially connected, and the inverter (2) is further sequentially connected with a primary side resonance unit (5) and a primary side resonance mechanism transmitting end (6) And (4) connecting.
3. The unsprung coil structure-based wireless power transmission system for the hub motor of the electric automobile according to claim 2, wherein the primary side controller (4) and the secondary side controller (10) each comprise a current sensor (4-1), a modem module (4-2), a PI control module (4-3), and a Wi-Fi communication module (4-4) for realizing constant voltage, constant current control, and maximum efficiency tracking control of the system.
4. The unsprung coil structure-based wireless power transmission system for hub motors of electric vehicles according to claim 1, characterized in that a shielding case (15) is mounted on the outside of the hub motor (12).
5. The unsprung coil structure-based wireless power transmission system for hub motors of electric vehicles according to claim 1, wherein the transmitting end (6) of the magnetic coupling mechanism comprises a transmitting end coil (6-1) and a transmitting end magnetic core (6-2), and the transmitting end magnetic core (6-2) is laid below the transmitting end coil (6-1).
6. The unsprung coil structure-based wireless power transmission system for hub motors of electric vehicles according to claim 5, characterised in that the transmitting end coil (6-1) is designed as a square, circular, DD, DDQ, three-phase stacked, multi-small coil, long rail or bipolar.
7. The unsprung coil structure-based wireless power transmission system for electric automobile hub motors according to claim 1, characterized in that the magnetic coupling mechanism receiving end (7) is of a planar structure, the magnetic coupling mechanism receiving end (7) comprises a receiving end coil (7-1) and a receiving end magnetic core (7-2), and the receiving end coil (7-1) is arranged on the receiving end magnetic core (7-2).
8. The unsprung coil structure-based wireless power transmission system for hub motors of electric vehicles according to claim 7, characterised in that the receiving end coil (7-1) is designed as square, circular, DD, DDQ or three-phase stacked.
9. The unsprung coil structure-based wireless power transmission system for hub motors of electric vehicles according to claim 5 or 7, characterized in that the primary side resonance unit (5) is located inside the transmitting end coil (6-1), the secondary side resonance unit (8) is located inside the receiving end coil (7-1), and the primary side resonance unit (5) and the secondary side resonance unit (8) employ a compensation network conforming to circuit topology interoperability.
10. The unsprung coil structure-based wireless power transmission system for hub motors for electric vehicles according to claim 9, wherein the compensation network is S-S, S-P, P-P, P-S, LCC-S, LCC-LCC, LCL-LCL or LCL-S.
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| CN202110974326.4A CN113635790A (en) | 2021-08-24 | 2021-08-24 | Electric automobile wheel hub motor wireless power transmission system based on coil structure under spring |
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Application publication date: 20211112 |