EP3084781A1 - Bobine électrique et utilisation d'une bobine électrique - Google Patents

Bobine électrique et utilisation d'une bobine électrique

Info

Publication number
EP3084781A1
EP3084781A1 EP14806274.8A EP14806274A EP3084781A1 EP 3084781 A1 EP3084781 A1 EP 3084781A1 EP 14806274 A EP14806274 A EP 14806274A EP 3084781 A1 EP3084781 A1 EP 3084781A1
Authority
EP
European Patent Office
Prior art keywords
coil
wire
aluminum
electric coil
electric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14806274.8A
Other languages
German (de)
English (en)
Other versions
EP3084781B1 (fr
Inventor
Bernd Stuke
Martin Koehne
Robert Giezendanner-Thoben
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3084781A1 publication Critical patent/EP3084781A1/fr
Application granted granted Critical
Publication of EP3084781B1 publication Critical patent/EP3084781B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/023—Alloys based on aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings
    • 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
    • H01F27/2823—Wires
    • 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
    • H01F27/2847—Sheets; Strips

Definitions

  • the invention relates to an electric coil according to the preamble of claim 1. Furthermore, the invention relates to the use of an inventive
  • An electric coil according to the preamble of claim 1 is part of a fuel! Njektors for injecting fuel into the combustion chamber of an internal combustion engine from practice already known.
  • the electric coil serves to actuate an injection member, for example in the form of a nozzle needle, indirectly or directly in order to close or release injection openings formed in the fuel injector.
  • the coil wire usually consists of a wire core made of copper, which is surrounded by an insulator layer, for example, baked enamel.
  • an insulator layer for example, baked enamel.
  • an injector at high temperatures can be critical. For this reason, it is common to have the packing or power density of such Increase electric coils. This is done for example by a profile wire, with which it is possible, the degree of filling of the wire windings on a
  • the invention has the object, an electric coil according to the preamble of claim 1 such that the strong in the prior art
  • Temperature-dependent resistance characteristic of the electric coil is reduced.
  • the highest possible power density i.
  • the highest possible magnetic actuation force can be achieved.
  • This object is achieved in an electric coil with the features of claim 1, characterized in that the wire core of the coil wire made of aluminum and arranged with the aluminum in electrically conductive contact graphene.
  • Such a material mix has the advantage that it has a combination of the relatively low change in resistance over the course of temperature known from aluminum and an overall relatively low specific resistance, similar to the use of copper.
  • Graphene at least substantially homogeneous in cross section of the wire core in Distributed aluminum and arranged oriented in the power line direction.
  • graphene is usually formed in the form of platelets, ie a very thin cross-section having elements, so that it is essential that the orientation of the graph in the power line direction.
  • the individual graphene elements may be spatially separated from one another in the direction of the current line, or, particularly advantageously, to be overlapping one another so that a continuous conductive graphene layer is achieved in the current line direction.
  • the individual Graphen elements are separated in the power line direction, finds an electrical line between the
  • the power line reducing effects such as air inclusions or the like, are present.
  • the graphene in an alternative embodiment of the invention, it is also possible for the graphene to be formed as a layer which is separate from the aluminum and electrically conductively connected to the aluminum, preferably in the direction of flow, preferably on a surface of the wire core.
  • the two components serving the power line, the aluminum and the graphene may optionally be formed in separate manufacturing processes or manufacturing steps, which are subsequently connected to one another in an electrically conductive manner.
  • the aluminum serves as a carrier material for arranging or training of graphene.
  • the commonly used insulating layers of plastic eg baked enamel
  • the insulating layer does not serve the power line, a decreasing packing density or performance of the electric coil results with an increasing thickness of the insulating layer.
  • the insulating layer it is particularly preferred according to the invention for the insulating layer to have an aluminum oxide layer with a thickness of between 1 ⁇ m and 10 ⁇ m. preferably between 2 ⁇ and 5 ⁇ .
  • An oxide layer has the advantage over the use of plastic in particular that it has a high thermal conductivity and thus also allows a relatively effective dissipation of the heat of the coil wire.
  • the performance of the electric coil is increased by an increased filling factor by the particularly thin design of the insulating layer compared to an insulating layer made of plastic.
  • Aluminum oxide takes place in particular by anodic oxidation (anodizing process).
  • the anodic oxidation is an electrolytic process by which an oxide layer is produced on a surface which is reinforced by about a factor of 100 compared with a naturally formed (oxide) layer, so that in practice a 4 ⁇ thick insulating layer is sufficient with sufficient voltage breakdown.
  • a particular embodiment of the insulating layer provides that the insulating layer only partially covers the graphene. This is especially true
  • Power line is used and has a very low electrical resistance, it is essential that each covers an insulating layer overlying the underlying, partially exposed graphene layer when winding over the coil wire.
  • a geometrical configuration of the coil wire in which the latter has at least essentially a rectangular cross section, is very particularly preferred.
  • Such a design increases the fill factor and thus the power density of the electric coil to a particularly high degree and therefore allows for a certain performance particularly small or compact electrical coils.
  • the coil wire has a width has, which corresponds to the width of the bobbin in the longitudinal direction thereof.
  • the same effect can alternatively be achieved by having the coil wire having a width 1 / n times the width of the coil
  • Coil in the longitudinal direction corresponds, and if two in
  • Such an electric coil according to the invention therefore finds particular use as part of a motor vehicle injection component, in particular one
  • the electric coil according to the invention can be used in all applications in which a particularly high performance and / or a small installation space for the electric coil is desired.
  • FIG. 4 shows a cross section through a comparison with FIG. 3 Modified
  • Fig. 5 is a representation of the resistance curve different
  • an electric coil 10 according to the invention is shown, as used for example as part of a motor vehicle injection component in the form of a fuel injector.
  • the electric coil 10 serves for the at least indirect actuation of an injection valve member (nozzle needle) into the fuel! njektor.
  • the electric coil 10 comprises a plastic, in the
  • Injection molding process produced bobbin 11 in the form of a sleeve with two laterally arranged, the bobbin 11 longitudinally delimiting, radially circumferential flanges 12, 13 and concentric with the longitudinal axis 14 of the bobbin 11 arranged in this recess 15. Between the two flanges 12, 13 forms the Bobbin 11 a particular circular peripheral surface 16 for the arrangement of at least one
  • Coil wire unit 20 off are in
  • Axial direction of the longitudinal axis 14 considered two coil wire units 20 provided on the bobbin 11, which are electrically conductively connected to each other (not shown) by a wire end of a coil wire unit 20 is connected to a wire end of the other coil wire unit 20.
  • the coil wire 25, 25 a of the coil wire unit 20, which is wound in the form of a plurality of turns on the bobbin 11, consists of two
  • the coil wire 25 is provided with a
  • Wire core 23 consisting of aluminum 21st In the power line direction, i.
  • 21 plates of graphene 22 are arranged in the aluminum, wherein the platelets are perpendicular to the plane of Fig. 3 either all directly electrically connected in the form of a band, or arranged at intervals to each other.
  • the distribution of the graphene 22 within the wire core 23 or the aluminum 21 is at least substantially homogeneous.
  • the coil wire 25 having a rectangular cross-section of the width b is of a particularly uniform wall thickness a
  • Insulation layer 26 over the entire cross section of the coil wire 25 surrounded.
  • the insulating layer 26 is formed as an aluminum oxide layer 27 and produced, for example, in the anodizing process.
  • the wall thickness a of the insulating layer 26 is between 1 ⁇ and 10 ⁇ , preferably between 2 ⁇ and 5 ⁇ , most preferably 4 ⁇ .
  • Such a manufactured coil wire 25 can be stored in accordance with the representation of FIG. 2 in the form of a wound-up belt 28 or processed by machine.
  • FIG. 4 a comparison with FIG. 3 modified coil wire 25a is shown.
  • the wire core 23 of the coil wire 25a is made of aluminum 21 without
  • the graphene 22 is applied as a band-shaped layer on the surface or on the upper side 29 of the wire core 23 and connected to it in an electrically conductive manner.
  • the insulating layer 26 also consists of an aluminum oxide layer 27, which completely surrounds the wire core 23 in the area outside of the graphene 22. In the field of graphene 22 reaches the
  • Insulation layer 26 side up to the graphene 22 zoom, but the graph 22 is not on the wire core 23 facing away from the top of the
  • Insulating layer 26 surrounded or covered.
  • the specific resistance R s (Y-axis) of various materials is shown above the temperature T (x-axis).
  • the reference numeral 31 shows the course of the specific resistance R s of aluminum, while the reference numeral 32 illustrates the course of the resistivity R s of copper.
  • the reference number 33 shows the specific resistance R s of the material combination according to the invention, consisting of aluminum 21 and graphene 22. It can be seen that such a combination of materials has an almost constant or only slightly increasing specific resistance R s as the temperature rises, which with respect to its
  • the electric coil 10 according to the invention can be modified or modified in many ways, without departing from the spirit of the invention. It is conceivable, for example, instead of a substantially rectangular cross-section for the coil wire 25, 25a to form this cross-section square or, in the case of the graphite 22 arranged in the aluminum 21, roundly. It should also be noted that the use of the invention should not be limited to electric coils 10, which serve as part of a fuel injection component.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electromagnets (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

L'invention concerne une bobine électrique (10), comprenant au moins un corps (11) et un fil à bobiner (25 ; 25a) entourant le corps (11) de la bobine au niveau d'une surface circonférentielle (16) du corps (11) de la bobine sous la forme d'au moins un enroulement. Le fil à bobiner (25 ; 25a) est constitué d'un noyau de fil (23) électroconducteur et d'une couche isolante (26) entourant au moins le noyau de fil (23) au moins par endroits. Selon l'invention, le noyau de fil (23) est constitué d'aluminium (21) et de graphène (22) disposé en contact électroconducteur avec l'aluminium (21).
EP14806274.8A 2013-12-19 2014-12-03 Bobine électrique et utilisation d'une bobine électrique Active EP3084781B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013226572.7A DE102013226572A1 (de) 2013-12-19 2013-12-19 Elektrospule und Verwendung einer Elektrospule
PCT/EP2014/076381 WO2015090964A1 (fr) 2013-12-19 2014-12-03 Bobine électrique et utilisation d'une bobine électrique

Publications (2)

Publication Number Publication Date
EP3084781A1 true EP3084781A1 (fr) 2016-10-26
EP3084781B1 EP3084781B1 (fr) 2017-09-20

Family

ID=52003781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14806274.8A Active EP3084781B1 (fr) 2013-12-19 2014-12-03 Bobine électrique et utilisation d'une bobine électrique

Country Status (6)

Country Link
US (1) US20160336103A1 (fr)
EP (1) EP3084781B1 (fr)
CN (1) CN106104716B (fr)
DE (1) DE102013226572A1 (fr)
RU (1) RU2659563C1 (fr)
WO (1) WO2015090964A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016202071A1 (de) 2016-02-11 2017-08-17 Siemens Aktiengesellschaft Elektrischer Leiter für eine elektrische Maschine mit erhöhtem Leistungsgewicht und elektrische Komponente für die elektrische Maschine
DE102017205296A1 (de) * 2017-03-29 2018-10-04 Robert Bosch Gmbh Elektrischer Leiter
DE102017210441A1 (de) * 2017-06-21 2018-12-27 Robert Bosch Gmbh Elektromagnetisch erregbare Spule
CN107726600B (zh) * 2017-09-27 2020-10-02 青岛海尔智能技术研发有限公司 一种磁能热水器
CN110491619A (zh) * 2019-09-04 2019-11-22 同济大学 一种磁浮列车用箔绕电磁铁
US20240047096A1 (en) * 2022-08-03 2024-02-08 Infineon Technologies Austria Ag Graphene in electromagnetic systems

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Also Published As

Publication number Publication date
WO2015090964A1 (fr) 2015-06-25
US20160336103A1 (en) 2016-11-17
DE102013226572A1 (de) 2015-06-25
EP3084781B1 (fr) 2017-09-20
RU2016129242A (ru) 2018-01-23
CN106104716A (zh) 2016-11-09
CN106104716B (zh) 2018-12-18
RU2659563C1 (ru) 2018-07-03

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