CN112216479B - Method for reducing magnetic core loss generated by coil lead wire - Google Patents

Method for reducing magnetic core loss generated by coil lead wire Download PDF

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CN112216479B
CN112216479B CN202010848658.3A CN202010848658A CN112216479B CN 112216479 B CN112216479 B CN 112216479B CN 202010848658 A CN202010848658 A CN 202010848658A CN 112216479 B CN112216479 B CN 112216479B
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magnetic core
magnetic
lead wires
coil
core
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CN112216479A (en
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高欣芳
王�义
冉安杰
杨中平
林飞
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Beijing Jiaotong University
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Beijing Jiaotong University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • 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
    • 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 invention relates to a method for reducing magnetic core loss generated by coil lead wires, which comprises the following steps: step 1, determining the positions of two lead wires of a coil, which penetrate out of a magnetic core; and 2, slotting a magnetic core between the two lead wires, and removing the magnetic core between the two lead wires to communicate the two lead wires. The coil is two D type coils, the magnetic core is the dull and stereotyped magnetic core of ferrite. The magnetic core loss after the method is adopted is 11.65W. The method for designing the magnetic core can avoid the problem of serious heating caused by overlarge magnetic core loss under the condition that the lead passes through the magnetic core.

Description

Method for reducing magnetic core loss generated by coil lead wire
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a method for reducing magnetic core loss generated by a coil lead.
Background
In recent years, wireless charging technology has received more and more attention due to its advantages of safe operation, flexibility, convenience, and low maintenance cost. Based on the gradual improvement of theoretical basis, the high-power wireless charging technology starts to enter the industrialized development process, and is mainly applied to vehicles such as electric vehicles and the like at present.
The electromagnetic coupling mechanism is a key part in a wireless power transmission system, and the reasonable design of the electromagnetic coupling mechanism is a key problem for realizing safe and efficient power transmission. When the coupling mechanism is actually installed, due to space limitation, the coil lead wires need to be led out of the magnetic core and then connected with other parts in the system, and the lead wires will additionally increase the loss of the magnetic core, so that the temperature of the magnetic core is increased, the efficiency of the system is reduced, and the safety of a vehicle in the running process is affected, so that measures need to be taken to reduce the influence of the lead wires on the loss of the magnetic core.
Disclosure of Invention
Aiming at the problem of the increase of the magnetic core loss caused by the lead wire of the coil passing through the magnetic core, the invention defines the reason of the problem based on the analysis of the magnetic field and provides a method for effectively reducing the loss.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a method of reducing core losses generated by coil leads, comprising the steps of:
step 1, determining the positions of two lead wires 3 of a coil 2 penetrating out of a magnetic core 1;
and 2, slotting the magnetic core 1 between the two lead wires 3, and removing the magnetic core 1 between the two lead wires 3 to communicate the two lead wires 3.
On the basis of the scheme, the coil 2 is a double-D type coil, and the magnetic core 1 is a ferrite flat magnetic core.
On the basis of the scheme, the magnetic core loss after the method is adopted is 11.65W.
The invention has the beneficial effects that:
the method for designing the magnetic core can avoid the problem of serious heating caused by overlarge magnetic core loss under the condition that the lead passes through the magnetic core.
Drawings
The invention has the following drawings:
in fig. 1, (a) is a top view of a wire perforation pattern, and (b) is a side view of the wire perforation pattern.
In FIG. 2, (a) is a graph showing the loss density distribution of the surface of the core under the model shown in FIG. 1, and (b) is a graph showing the loss density distribution of the surface of the core when no lead wire is drawn out of the core (control).
In fig. 3, (a) is a magnetic induction vector distribution diagram of the surface of the core under the core piercing model, and (b) is a magnetic induction vector distribution diagram of the surface of the core under the control model.
FIG. 4 is a graph of the surface loss density of a magnetic core after notching.
In the figure: 1-a magnetic core; 2-a coil; 3-lead.
Detailed Description
The invention is described in further detail below with reference to figures 1-4.
The invention provides a method for reducing magnetic core loss generated by coil leads, which utilizes the relationship among current, magnetic induction intensity and loss, reduces the magnetic core loss and heating problems by reducing the influence of electrified leads on the magnetic field distribution in a magnetic core, and can improve the safety of a coupling mechanism while increasing the system efficiency. In addition, the method is simple to operate and easy to implement.
The eddy current loss induced on the ferrite core with high magnetic conductivity and low electric conductivity is negligible, but the ferromagnetic substance also consumes energy in the alternating current magnetization process, namely the core iron loss, so the core loss in the invention is particularly referred to as the iron loss. The Steinmetz equation shown in formula (1) is an empirical formula for calculating the loss per unit volume of the ferrite core, and is widely used in the industry for estimating the iron loss. In the formula CmF is the working frequency, B is the amplitude of the magnetic induction intensity, and alpha and beta are the frequency and the magnetic induction loss coefficient determined by the magnetic core material respectively. It can be seen from the formula that in the fixed frequency system, the iron loss density is larger at the position where the magnetic induction intensity in the magnetic core is larger.
PFe＝Cm·fα·Bβ (1)
The secondary coil is arranged at the bottom of the vehicle, so as to better shield a magnetic field and reduce the influence of magnetic leakage on metal substances at the bottom of the vehicle and a human body in the vehicle, a flat magnetic core can be adopted to completely cover the coil part, at the moment, the lead of the coil needs to penetrate out of the magnetic core and then is connected with other circuit parts, and a lead punching model is called as a lead punching model in the invention and consists of a double-D type coil and a ferrite flat magnetic core, and the lead of the coil is connected with other parts in a system after a hole penetrates through the magnetic core to form a closed loop (the simulation does not contain other parts of the system).
Fig. 2(a) is a graph showing the surface loss density distribution of the core under the model shown in fig. 1, in which the lead wire in the model is set not to pass through the core as a control, and the core loss density distribution is as shown in fig. 2 (b). In contrast, when the lead wire passes through the core, the loss density of the entire core is significantly increased, and the region having a large loss density is concentrated in the vicinity of the lead wire.
Fig. 3(a) and (b) are magnetic induction vector distribution diagrams of the magnetic core surface under two models of a magnetic core perforation and a comparison group respectively, and a comparison shows that a lead wire with current induces a new magnetic field at a peripheral magnetic core, the magnetic field direction at the magnetic core between the two lead wires is consistent, and the magnetic induction is the maximum. As can be seen from the equation (1), the higher the magnetic induction, the higher the loss, and the distribution of the magnetic induction corresponds to the above-described core loss density distribution. Therefore, in order to reduce the core loss, it is necessary to reduce the influence of the magnetic field generated by the lead wires on the original magnetic field distribution.
In order to reduce the influence of the leads, the invention provides a method for slotting the magnetic core between two adjacent leads, fig. 4 is a magnetic core surface loss density distribution diagram after slotting, and table 1 is magnetic core loss values under three models. The method blocks the magnetic circuit of the original magnetic force line generated by the lead wire in a slotting mode, and as can be seen from the figures and the table, the method can reduce the influence of the lead wire on the surface loss density distribution of the magnetic core, so that the magnetic core loss under a slotting model is basically consistent with the number of a comparison group, the overall loss of the magnetic core and the problem of heating of the magnetic core caused by the overall loss of the magnetic core are effectively reduced, the system efficiency is improved, and the safety of a vehicle in operation is ensured.
TABLE 1 magnetic core loss numerical table
Figure BDA0002643973640000041
The technical key points and points to be protected of the invention are as follows:
method for reducing magnetic core loss based on magnetic field analysis
Those not described in detail in this specification are within the skill of the art.

Claims (1)

1. A method of reducing core losses caused by coil leads, comprising the steps of:
step 1, determining the positions of two lead wires (3) of a coil (2) which respectively penetrate out of a magnetic core (1);
step 2, slotting the magnetic core (1) between the two lead wires (3) and penetrating the magnetic core, completely removing the magnetic core (1) between the two lead wires (3), communicating the two lead wires (3), and blocking a magnetic circuit of original magnetic lines of force generated by the lead wires in a slotting mode;
the coil (2) is a double-D-shaped coil positioned on the same plane, and the magnetic core (1) is a ferrite flat magnetic core; the coil part is completely covered by the magnetic core (1), and the coil lead penetrates out of the magnetic core and is then connected with other circuit parts; the lead wires with current induce a new magnetic field at the peripheral magnetic core, the magnetic field direction at the magnetic core between the two lead wires is consistent, and the magnetic induction intensity is maximum;
the magnetic core loss after the method is adopted is 11.65W.
CN202010848658.3A 2020-08-21 2020-08-21 Method for reducing magnetic core loss generated by coil lead wire Active CN112216479B (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN209544077U (en) * 2019-02-14 2019-10-25 绵阳伟成科技有限公司 A kind of multinomial coupling inductor

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Publication number Priority date Publication date Assignee Title
JP3965193B2 (en) * 2005-04-28 2007-08-29 Ｔｄｋ株式会社 Vertical transformer and ferrite core
EP2620961A1 (en) * 2011-01-26 2013-07-31 Panasonic Corporation Contactless charging module and receiving-side and transmission-side contactless charger using same
KR102174244B1 (en) * 2013-08-29 2020-11-04 주식회사 솔루엠 Transformer and power supply unit including the same
CN204884792U (en) * 2015-06-23 2015-12-16 上海康顺磁性元件厂有限公司 Wireless magnetic core for charger
JP2017147306A (en) * 2016-02-16 2017-08-24 Tdk株式会社 Non-contact power receiving coil device and non-contact power receiving core
CN206259239U (en) * 2016-12-19 2017-06-16 台达电子企业管理（上海）有限公司 Pcb board transformer and its coil plate
CN207410120U (en) * 2017-11-24 2018-05-25 东莞市安汇电子有限公司 Wireless charging coil closing magnetic path structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN209544077U (en) * 2019-02-14 2019-10-25 绵阳伟成科技有限公司 A kind of multinomial coupling inductor

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