CN107640047A - A kind of magnetic coupling and electric bus wireless charging system based on magnetic liquid - Google Patents

A kind of magnetic coupling and electric bus wireless charging system based on magnetic liquid Download PDF

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Publication number
CN107640047A
CN107640047A CN201710827987.8A CN201710827987A CN107640047A CN 107640047 A CN107640047 A CN 107640047A CN 201710827987 A CN201710827987 A CN 201710827987A CN 107640047 A CN107640047 A CN 107640047A
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iron core
primary side
magnetic
secondary side
electric bus
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CN201710827987.8A
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CN107640047B (en
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何为
刘小虎
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Chongqing Yuxin Pingrui Electronic Co ltd
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Chongqing University
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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
    • 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
    • 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 present invention relates to a kind of magnetic coupling based on magnetic liquid and electric bus wireless charging system, is related to energy transmission and wireless charging field.Include symmetrically arranged primary side U-iron core and secondary side U-iron core；Secondary side U-iron core is arranged on inside electric bus and is wound with second siding ring, and second siding ring is used to charge to the battery pack of electric bus；Primary side U-iron core is arranged on outside electric bus, and for being coupled with secondary side U-iron core, first siding ring is wound with primary side U-iron core, for carrying out Power Exchange with second siding ring；Two magnetohydrodynamic plants are additionally provided between primary side U-iron core and secondary side U-iron core, when primary side U-iron core and secondary side U-iron core carry out energy transmission by magnetic coupling, the both ends of primary side U-iron core and secondary side U-iron core are realized by magnetic fluid to be flexibly connected.The present invention produces bigger magnetic flux density, increases substantially magnetic coupling efficiency in the case where not changing the first siding ring number of turn and electric current.

Description

A kind of magnetic coupling and electric bus wireless charging system based on magnetic liquid
Technical field
The present invention relates to energy transmission and wireless charging field, it is related to a kind of magnetic coupling and electricity based on magnetic liquid Dynamic bus wireless charging system.
Background technology
In wireless energy transfer field, the Large Copacity of energy, efficient quick transmission is always chasing after for researcher Seek target.Current radio energy-transmitting mode mainly has inductive coupling type, magnetic resonance type, electric field induction, microwave and laser.Electricity The transmission means of field induction type is larger to human body radiation, and application field is restricted；Microwave and laser are applied to remote Energy transmits, because the aerial long-distance transmissions of electromagnetic wave can significantly decay, so transmission capacity is limited；Due to sensing The radio energy-transmitting mode of manifold type and magnetic resonance type is more hopeful to be popularized in daily life, so both at present It is the study hotspot in radio energy-transmitting field.
For induction type coupling and two kinds of radio energy-transmitting modes of magnetic resonance, just from the point of view of current achievement in research, although obtaining Larger progress, but still there are many bottlenecks to need to break through, wherein needing to solve the problems, such as to be energization emphatically Transmission capacity, efficiency and reduction charging interval.The scientific worker in radio energy-transmitting field seeks to solve in all its bearings above-mentioned The method of problem, such as improve the structure of a secondary coil, add repeating coil, reduce field frequency, but it is all substantive without obtaining The effect of property.The very corn of a subject is magnetic structure, i.e. the air gap be present between a secondary coil.It is theoretical according to magnetic circuit, when When whole magnetic loop has the air gap of very little spacing, the magnetic resistance of whole magnetic loop can increase sharply, larger in order to obtain Magnetic flux, it is necessary to increase the magnetomotive force in whole loop, and increasing magnetomotive method has two, that is, increases the coil of primary winding The number of turn, next to that increase exciting current.The former can increase the volume of whole radio energy-transmitting device, cost increase, and the latter is then System loss can be increased, reduce energy transmission efficiency.
The content of the invention
In view of this, it is an object of the invention to provide a kind of magnetic coupling based on magnetic liquid and electric bus without Micro USB electric system, in the case of realizing and not changing the first siding ring number of turn and electric current, bigger magnetic flux density is produced, significantly Degree improves magnetic coupling efficiency.
To reach above-mentioned purpose, the present invention provides following technical scheme：
One kind is based on the magnetic-coupled magnetic coupling of magnetic liquid, comprising symmetrically arranged primary side U-iron core and secondary Side U-iron core；Primary side U-iron core and secondary side the U-iron core is wound with first siding ring and second siding ring respectively；
A container is provided with the both ends of the primary side U-iron core, the container is used to hold magnetic fluid；
When the first siding ring and second siding ring carry out energy transmission, magnetic fluid in the container is by described one The both ends of secondary side U-iron core and secondary side U-iron core connect respectively, form flux path.
A kind of electric bus wireless charging system, includes magnetic coupling；The secondary side U-iron core of the magnetic coupling It is arranged on inside electric bus, second siding ring is wound with the secondary side U-iron core, the second siding ring is used for electronic The battery pack charging of bus；
The primary side U-iron core of the magnetic coupling is arranged on outside electric bus, for the secondary side U-iron Core is coupled, and first siding ring is wound with the primary side U-iron core, for carrying out Power Exchange with the second siding ring；
When electric bus is charged, the magnetic fluid of the magnetic coupling is by the primary side U-iron core and secondary The both ends difference magnetic connection of side U-iron core.
Further, the container of the magnetic coupling is respectively and fixedly connected with the both ends of the primary side U-iron core, it is described once The lower surface of the container is run through at the both ends of side U-iron core, and the upper surface at the both ends of the primary side U-iron core is below institute State the upper surface of container.
Further, the primary side U-iron core and secondary side U-iron core are made by amorphous nano-crystalline alloy material, tool There are identical shape and size.
Further, the secondary U-iron core is arranged on the chassis of electric bus, and the secondary side U-iron core There is protrusion at both ends.
Further, the primary side U-iron core is placed in below ground surface with the container by dividing plate；Open the dividing plate The magnetic fluid in the container is allowed to be docked with the both ends of the secondary side U-iron core.
Further, in addition to pressure sensor, laser distance sensor and Machinery Control System, the pressure sensor are used Whether there is electric bus to enter charged area in detecting on road surface, and pressure information is transmitted to the Machinery Control System；
The laser distance sensor is arranged on the primary side U-iron core, and the laser distance sensor is used to examine The relative position surveyed between primary side U-iron core and secondary side the U-iron core, and positional information is transmitted to the machinery and controlled System processed, the Machinery Control System are used for the dividing plate according to the pressure sensor information come folding and swashed according to described The information of electrical distance sensor adjusts the relative position of the primary side U-iron core and the secondary side U-iron core so as to accurate Really docking.
The beneficial effects of the present invention are：The present invention by the magnetic fluid of magnetic coupling device greatly reduce electric bus without Magnetic resistance in micro USB electromagnetic coupling mechanisms, simultaneously because the connection of magnetic fluid belongs to flexible connection, therefore avoid magnetic coupling dress The mechanical collision in coupling process is put, the injury to equipment is small, simultaneously because instead of original bus wireless charging with magnetic fluid In the air gap, improve the energy transmission efficiency in electric bus charging process.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out Explanation：
Fig. 1 is the magnetic coupling structural representation of the present invention；
Fig. 2 is iron circuit figure, and wherein a is the iron circuit figure of the air gap hour, and b is iron core when the air gap is big Magnetic circuit figure；
Fig. 3 is equivalent magnetic circuit figure；
Fig. 4 is electric bus wireless charging system schematic diagram of the present invention；
Fig. 5 is the magnetic flux density of YZ plane of the embodiment of the present invention when a secondary side iron core is accurately docked by magnetic fluid Distribution map；
Fig. 6 is that the magnetic flux of YZ plane of the embodiment of the present invention when a secondary side iron core is accurately docked by the air gap is close Spend distribution map；
Fig. 7 is that the magnetic flux of YZ plane of the embodiment of the present invention when a secondary side iron core is not docked accurately by magnetic fluid is close Spend distribution map；
Fig. 8 is the magnetic flux of YZ plane of the embodiment of the present invention when a secondary side iron core is not docked accurately by the air gap Density profile.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is the magnetic coupling structural representation of the present invention, as shown in figure 1, a secondary winding 1,2 is wound on one respectively On secondary U-iron core 3,4, magnetic fluid 5 is fixed in the both ends of a U-iron core by container 6, when between a secondary winding 1,2 When Power Exchange be present, magnetic fluid is because of its magnetic and mobility, so that the both ends of one or two U-shaped iron cores 3,4 are connected, from And greatly improve the efficiency of transmission and transmittability of energy in a device.
The core material of the secondary side of the present invention is amorphous nano peritectic alloy simultaneously, is of similar shape, size, is Obtained by a square shape iron core symmetry division.
In order to prove the superior performance of the present invention, the angle that the present embodiment calculates from magnetic circuit is described in detail, such as Shown in Fig. 2：
When the gap very little between two U-shaped iron cores, the two is coupled by magnetic flux Φ completely, due to air-gap field Edge effect, the area by magnetic core is greater than by the area occupied by the magnetic flux of air gap, as shown in Figure 2.When two iron cores The distance between further increase, magnetic flux Φ will be divided into two branch roads, i.e. Φ 1 and Φ 2, as shown in Fig. 2 when between two iron cores When the distance between the air gap and two ports of an iron core are quite big, magnetic flux will be mainly via Air Coupling, i.e. Φ ≈ Φ It is nonsensical that 2, Φ 1 ≈ 0 are now further added by coupling of the exciting curent for secondary side.
Because small air gap can cause great restrictive function to whole energy coupling mechanism, the present invention is only for figure 2 analyze the restrictive function that the air gap is transmitted to energy.If the average length of magnetic path of two iron cores is l, relative permeability is μFe, cross-sectional area AFe, the distance in gap is lδ, relative permeability μδ, cross-sectional area Aδ, coil turn N, pass through line The electric current of circle is i, theoretical according to magnetic circuit, draws equivalent magnetic circuit as shown in Figure 3.
Had according to the Ohm's law of magnetic circuit
Ni=Φ × (RmFe1+RmFe2+Rmδ1+Rmδ2)
Wherein
μ0For space permeability.
Coil current, which can then be obtained, is：
Now, with the gap between a kind of liquid filling iron core of magnetic conductivity, the fine and close connection of iron core is realized, whole magnetic returns The magnetic resistance on road will be remarkably decreased, and in order to reach the effect of original the air gap, i.e. the magnetic flux Φ of magnetic loop is constant, and winding is applied Electric current be changed into i ', and the relative permeability of magnetic conductivity liquid is μδ', and the cross-sectional area that magnetic flux passes through gap is Aδ', utilize The step of solving i tries to achieve i ', i.e.,
It can be obtained by i and i ' formula：
Due to μFe＞ ＞ μδ, μFe＞ ＞ μδ', therefore above formula is reduced to：
When the air gap very little, Aδ' ≈ A, and the magnetic conductivity of magnetic liquid is relatively high, the magnetic effect of gap location is relative The air gap is weak, so Aδ' ＜ Aδ≈ A, so as to which further abbreviation is：
Due to the relative permeability μ of airδ=1, if the relative permeability of used magnetic liquid is only 100, be Identical magnetic flux density Φ is produced in magnetic loop, the exciting current needed for magnetic structure that patent of the present invention proposes is only to contain Have 1/100 of electric current needed for the magnetic structure of the air gap, under conditions of same current is kept, coil turn need to be only reduced to Originally 1/100, equally achievable identical magnetic flux density, so as to substantially reduce the demand to coil, cost is therefore significantly Decline.
The present invention also propose it is a kind of be used for that electric automobile to be high-power, efficient wireless charging system, Fig. 4 is present invention electricity Dynamic bus wireless charging system schematic diagram, as shown in figure 4, the core of the charging system includes magnetic coupling mechanism and machinery Control system；An iron core and the magnetic liquid of magnetic coupling are together placed in underground, and secondary core portion is placed in electricity The chassis of dynamic bus, and the both ends of iron core are slightly prominent, are easy to dock by magnetic liquid with an iron core；
When electric bus needs charging, bus is rested within charging parking position first, parking stall is set on ground There is the pressure sensor of detection bus, after bus is stopped, pressure sensor transmits pressure information to Mechanical course system System, Machinery Control System opens dividing plate on the ground according to pressure information, then by laser distance sensor to primary side U Shape iron core and magnetic coupling carry out position adjustment, ensure that primary side U-iron core is in what is accurately docked with secondary side U-iron core Position.Subsequently into charging process, the electric energy of power network first enters primary side U-iron core by primary transformation of electrical energy and control Coil, electric current is now produced in coil and produces magnetic field, drive magnetic fluid in container by primary side U-iron core and secondary side U Shape iron core completes the docking of magnetic fluid.Coiling second siding ring on secondary side U-iron core, second siding ring are become by secondary energy Change and control the battery pack that the electric energy from power network is sent into bus to be charged.
The present invention also provides the comparison diagram of magnetic flux density to illustrate the superior performance of the present invention simultaneously, as shown in Figure 5,6, point The magnetic flux distribution figure of YZ planes that Wei be when a secondary side iron core is not docked accurately by magnetic fluid and in a secondary side iron The magnetic flux distribution figure of YZ planes when core is accurately docked by the air gap；It is respectively in a secondary side as shown in Figure 7,8 The magnetic flux distribution figure of YZ planes when iron core is not docked accurately by magnetic fluid and pass through between air in a secondary side iron core The magnetic flux distribution figure of YZ planes when gap is not docked accurately.It follows that either accurate docking be also the failure to it is accurate right Connect, all clearly, magnetic liquid passes through primary side U-iron core and two of being flexible coupling to the effect that magnetic coupling device of the invention is brought Secondary side U-iron core is so as to having filled up original the air gap so that the magnetic resistance in whole loop significantly declines, so as to significantly carry High coupling efficiency, from simulation result, in the case that the magnetic flux density of whole magnetic loop is compared to reservation the air gap 10 times or so are enhanced, and the distribution of magnetic induction line is also more uniform.
Finally illustrate, preferred embodiment above only to illustrate invention technical scheme and it is unrestricted, although passing through The present invention is described in detail for above preferred embodiment, it is to be understood by those skilled in the art that can be in shape Various changes are made in formula and to it in details, without departing from claims of the present invention limited range.

Claims (7)

  1. A kind of 1. magnetic coupling based on magnetic liquid, it is characterised in that：Include symmetrically arranged primary side U-iron core and two Secondary side U-iron core；Primary side U-iron core and secondary side the U-iron core is wound with first siding ring and second siding ring respectively；
    A container is provided with the both ends of the primary side U-iron core, the container is used to hold magnetic fluid；
    When the first siding ring and second siding ring carry out energy transmission, magnetic fluid in the container is by the primary side The both ends of U-iron core and secondary side U-iron core connect respectively, form flux path.
  2. A kind of 2. electric bus wireless charging system of the magnetic coupling described in application claim 1, it is characterised in that：Comprising Magnetic coupling；The secondary side U-iron core of the magnetic coupling is arranged on inside electric bus, the secondary side U-iron core On be wound with second siding ring, the second siding ring is used to charge to the battery pack of electric bus；
    The primary side U-iron core of the magnetic coupling is arranged on outside electric bus, for the secondary side U-iron core coupling Close, first siding ring is wound with the primary side U-iron core, for carrying out Power Exchange with the second siding ring；
    When electric bus is charged, the magnetic fluid of the magnetic coupling is by the primary side U-iron core and secondary side U-shaped The both ends difference magnetic connection of iron core.
  3. A kind of 3. electric bus wireless charging system according to claim 2, it is characterised in that：The magnetic coupling Container is respectively and fixedly connected with the both ends of the primary side U-iron core, and the both ends of the primary side U-iron core are through the container Lower surface, the upper surface at the both ends of the primary side U-iron core are below the upper surface of the container.
  4. A kind of 4. electric bus wireless charging system according to claim 2, it is characterised in that：The primary side U-iron Core and secondary side U-iron core are made by amorphous nano-crystalline alloy material, have the same shape and dimensions.
  5. A kind of 5. electric bus wireless charging system according to claim 2, it is characterised in that：The secondary U-iron core It is arranged on the chassis of electric bus, and there is protrusion at the both ends of the secondary side U-iron core.
  6. A kind of 6. electric bus wireless charging system according to claim 5, it is characterised in that：The primary side U-iron Core is placed in below ground surface with the container by dividing plate；Open the magnetic fluid and described two in the dividing plate permission container Docked at the both ends of secondary side U-iron core.
  7. A kind of 7. electric bus wireless charging system according to claim 6, it is characterised in that：Also include pressure sensing Device, laser distance sensor and Machinery Control System, the pressure sensor are used to detect on road surface whether have electric bus to enter Enter charged area, and pressure information is transmitted to the Machinery Control System；
    The laser distance sensor is arranged on the primary side U-iron core, and the laser distance sensor is used to detect institute The relative position between primary side U-iron core and secondary side U-iron core is stated, and positional information is transmitted to the Mechanical course system System, the Machinery Control System be used for according to the pressure sensor information come folding dividing plate and according to the laser away from The relative position of the primary side U-iron core and the secondary side U-iron is adjusted from the information of sensor so as to accurately dock.
CN201710827987.8A 2017-09-14 2017-09-14 Magnetic coupling mechanism and wireless charging system of electric bus based on magnetic liquid Active CN107640047B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108988505A (en) * 2018-07-25 2018-12-11 天津工业大学 A kind of high-power dynamic radio charging system of electric car
CN109067004A (en) * 2018-09-14 2018-12-21 重庆大学 A kind of magnetic coupling radio energy-transmitting method and device based on magnetic fluid

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102800469A (en) * 2011-05-20 2012-11-28 通用汽车环球科技运作有限责任公司 System and method of filling an air gap between a pair of core sections of a transformer
JP2014204540A (en) * 2013-04-03 2014-10-27 北陸電機製造株式会社 Non-contact power supply device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102800469A (en) * 2011-05-20 2012-11-28 通用汽车环球科技运作有限责任公司 System and method of filling an air gap between a pair of core sections of a transformer
JP2014204540A (en) * 2013-04-03 2014-10-27 北陸電機製造株式会社 Non-contact power supply device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108988505A (en) * 2018-07-25 2018-12-11 天津工业大学 A kind of high-power dynamic radio charging system of electric car
CN109067004A (en) * 2018-09-14 2018-12-21 重庆大学 A kind of magnetic coupling radio energy-transmitting method and device based on magnetic fluid
CN109067004B (en) * 2018-09-14 2022-03-11 重庆大学 Magnetic coupling wireless energy transfer method and device based on magnetic fluid

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