EP0986073A1 - Noyau de transformateur du type a separation - Google Patents

Noyau de transformateur du type a separation Download PDF

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Publication number
EP0986073A1
EP0986073A1 EP99912044A EP99912044A EP0986073A1 EP 0986073 A1 EP0986073 A1 EP 0986073A1 EP 99912044 A EP99912044 A EP 99912044A EP 99912044 A EP99912044 A EP 99912044A EP 0986073 A1 EP0986073 A1 EP 0986073A1
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EP
European Patent Office
Prior art keywords
soft magnetic
magnetic material
isolation transformer
core
ferrite
Prior art date
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Granted
Application number
EP99912044A
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German (de)
English (en)
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EP0986073B1 (fr
EP0986073A4 (fr
Inventor
Dongzhi The Furukawa Electric Co. Ltd JIN
Fumihiko The Furukawa Electric Co. Ltd ABE
Hajime The Furukawa Electric Co. Ltd MOCHIZUKI
Hideharu The Furukawa Electric Co. Ltd YONEHARA
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Publication of EP0986073A4 publication Critical patent/EP0986073A4/fr
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Publication of EP0986073B1 publication Critical patent/EP0986073B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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
    • H01F38/18—Rotary transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
    • 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
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F2017/048—Fixed inductances of the signal type  with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H01F2019/085—Transformer for galvanic isolation

Definitions

  • the present invention relates to an isolation transformer core, and more specifically to an isolation transformer applicable to an automobile component.
  • An isolation transformer is a transformer in which cores having coils are arranged to face each other to transmit electric power or an electric signal between each other through electromagnetic coupling of the opposite coils in a contactless manner.
  • a rotary transformer in which a primary core is fixed and a secondary core is rotatably arranged is an isolation transformer of this type, and a rotary transformer for a rotary head of a video tape recorder is generally known.
  • the rotary transformer in order to make a coupling coefficient of coils in cores large, cores having a high relative permeability are used and a gap between the cores is restricted to several ⁇ m.
  • the coupling coefficient of the coils when the coupling coefficient of the coils is very large, self-inductance and mutual inductance of the two opposite coils cancel each other, so that input-output impedance of the transformer is small. Therefore, in the rotary transformer, impedance matching between the coils and a load can be easily attained.
  • sintered ferrite cores are generally used as cores of the rotary transformer.
  • the sintered ferrite core is favorable as a core of a high frequency transformer in that it has a very high relative permeability and produces only a very small eddy-current loss.
  • the size of a gap between the cores has a direct influence on manufacturing cost.
  • a rotary transformer having a large coupling coefficient of coils in order to provide a gap between cores of several ⁇ m, high manufacturing precision and high assembling precision of components are required, which causes high manufacturing cost.
  • strict restriction is imposed on manufacturing cost and very strong vibration is produced during driving. Therefore, the rotary transformer for an automobile needs to have a gap of 0.5 mm or larger between the opposite cores.
  • the sintered ferrite core has favorable properties as mentioned above, but has a drawback peculiar to sintered oxide: fragility.
  • sintered ferrite cores are to be used as cores of a connector for an automobile, for example, cores of a connector for an air bag, various consideration is needed, for example, about how to prevent vibration, how to fix the cores and the like. Also in view of manufacturing cost, the sintered ferrite core is difficult to apply to an automobile component.
  • the present invention has been made in view of the above problems.
  • the object thereof is to provide an isolation transformer core which is less fragile and easy to manufacture.
  • an isolation transformer used as a connector for an air bag needs to be able to make large current flow to an air bag inflating unit under a low voltage of 12V (battery for an automobile) to transmit large power at a high speed.
  • impedance matching between a load and coils is very important.
  • the inventors have researched on the effective relative permeability between coils of an isolation transformer (for example, using generally used sintered ferrite cores having a relative permeability of about 3000 to 10000).
  • the effective relative permeability in the magnetic circuit varies to a large extent, depending on the size of the gap. This means that the coupling state of the coils varies even when the gap between the cores varies only a little due to vibration of the automobile.
  • the effective relative permeability in the magnetic circuit almost exclusively depends on the size of the gap between the cores. Therefore, however high the relative permeability of the core members may be, the effective relative permeability in the magnetic circuit is almost determined by the size of the gap between the cores.
  • the effective relative permeability in the magnetic circuit formed between the coils is determined by the relative permeability of the core members and the size of the gap between the cores, and that the size of the gap between the cores is a factor having a particularly large influence on the effective relative permeability in the magnetic circuit.
  • an isolation transformer using cores of magnetic material of a low relative permeability for example, mixed magnetic material
  • having a larger gap between the cores shows an effective relative permeability in the magnetic circuit between the coils slightly lower than that of an isolation transformer using conventional sintered ferrite cores, but that it is suited to, transmit large power in a moment and has advantages of improved vibration resistance and lowered manufacturing cost (suited for mass production).
  • the present invention has been made to obtain an isolation transformer core suitable for a connector for an air bag which is installed in an automobile and needs to be able to transmit large power in a moment.
  • the isolation transformer core of the present invention comprises a coil and a core member, and is characterized in that the core member comprises a mixed soft magnetic material which comprises an insulating material having an electrical insulating property and a soft magnetic material.
  • the soft magnetic material content is in the range of 10 to 70 volume %.
  • the soft magnetic material is soft magnetic ferrite or Sendust.
  • the insulating material is any one of thermoplastic resin, thermoplastic rubber, silicone rubber, thermosetting resin and adhesive.
  • an isolation transformer core 1 of the present invention comprises a core member 2 and a coil 3.
  • the core member 2 is made of a mixed soft magnetic material which is a mixture of an insulating material having an electrical insulating property and a soft magnetic material, and formed into a desired core shape.
  • the soft magnetic material content of the mixed soft magnetic material is lower than 10 volume %, the relative permeability of the core member formed thereof is lower than 2, so that it is difficult to attain the required transmission efficiency of an isolation transformer.
  • the soft magnetic material content is higher than 70 volume %, the relative permeability of the core member formed thereof is high (it may be higher than 20, depending on the kind and grain diameter of soft magnetic material). This is favorable to raise the transmission efficiency of an isolation transformer, but the core itself is fragile.
  • synthetic resin (described later) is used as the insulating material, flowability lowers, which makes injection molding difficult. Therefore, the soft magnetic material content of the mixed soft magnetic material is chosen in the range of 10 to 70 volume %.
  • synthetic resin is favorable to be used as the insulating material.
  • a thermoplastic resin such as nylon 6, nylon 66, nylon 11, nylon 12, polypropylene, polyphenylene sulfide or polyolefine, a thermoplastic rubber such as urethane, polyester or olefine, a thermosetting resin such as silicone rubber, epoxy resin, phenolic resin or diallyl phthalete, or two-liquid mixing adhesive can be used.
  • injection molding or the like can be applied to the mixed soft magnetic material. Therefore, a core member of a desired shape can be formed easily. Further, since the synthetic resin has flexibility, shock resistance of the formed core member is improved, and therefore the vibration resistance of the isolation transformer core itself is improved.
  • ceramic is favorable to be used as the insulating material.
  • Zirconia ceramic or silicon nitride ceramic which have high strength and high toughness can be used.
  • zirconia ceramic partial stabilized zirconia ceramic is in particular favorable.
  • powdered ceramic and powdered soft magnetic material are mixed to produce a mixed soft magnetic material.
  • the mixed soft magnetic material is formed into a desired shape and subjected to press sintering or HIP (hot isostatic pressing) to produce a desired isolation transformer core.
  • the isolation transformer core produced this way has better heat resistance and wear resistance due to the ceramic.
  • nylon is favorable in that it is inexpensive, fuses well with the soft magnetic material, and exhibits good flowability in injection molding.
  • soft magnetic material for example, soft magnetic ferrite, Sendust, permalloy, high-permeability amorphous material or the like can be used.
  • the soft magnetic ferrite for example, spinel ferrite represented by a general expression MO ⁇ Fe 2 O 3 (where M is at least one element chosen from Zn, Mn, Ni, Cu and Fe), or compound ferrite made of several kinds of the above spinel ferrites can be used.
  • Mn-Zn ferrite, Ni-Zn ferrite and Ni-Zn-Cu ferrite are in particular favorable.
  • the soft magnetic ferrite is used in a powdered state, and powdered soft magnetic ferrite whose maximum grain diameter is 100 ⁇ m or smaller is favorable. Powdered soft magnetic ferrite having an average grain diameter of 3.8 ⁇ m is more favorable.
  • Fe-Si-Al alloy containing about 6 to 11 weight % of Si and about 4 to 6 weight % of Al can be used. 9.62 weight % Si-5.38 weight % Al-bal.Fe alloy is in particular favorable.
  • the Sendust is used in a powdered state. Powdered Sendust having an average grain diameter of 10 ⁇ m or smaller is favorable.
  • Fe-Ni alloy containing 35 to 80 weight % of Ni can be used as the permalloy. 78 weight % Ni permalloy, 48 weight % Ni permalloy, and supermalloy (79 weight % Ni-5 weight % Mo-0.3 weight % Mn-bal.Fe) are favorable.
  • the permalloy is used in a powdered state. Powdered permalloy whose maximum grain diameter is 100 ⁇ m or smaller is favorable.
  • high-permeability amorphous material Fe amorphous material or Co amorphous material can be used.
  • the high-permeability amorphous material is also used in a powdered state having an average grain diameter of 1 to 500 ⁇ m.
  • an insulating material and a soft magnetic material are mixed and fused to produce a mixed soft magnetic material 2.
  • the mixed soft magnetic material 2 exhibits good flowability when it is heated to fuse. Therefore, it can be easily formed by injection molding into a desired shape, for example, into a disc-shaped core member 2 having a though-hole 2a at the center and a coil groove 2b for receiving a coil 3 in the disc face, as shown in FIG. 1.
  • a coil 3 having a predetermined number of turns is placed in the coil groove 2b of the formed core member 2 to form an isolation transformer core 1.
  • an isolation transformer core may be molded from the mixed soft magnetic material together with the coil 3 having a predetermined number of turns.
  • the isolation transformer cores each having a coil placed therein are arranged to face each other to form an isolation transformer.
  • the isolation transformer is used, for example, as a connector for an air bag.
  • a primary transformer core is set on a fixed portion (a column side) and a secondary transformer core is set on a rotary portion (steering portion).
  • the primary and secondary transformer cores are arranged to face each other with a gap of 1mm ⁇ 0.5mm therebetween.
  • a primary-side coil is connected with a control unit for controlling an air bag inflating unit, and a secondary-side coil is connected with the air bag inflating unit.
  • the core members of the present invention have a relatively low relative permeability (for example, the relative permeability of a core member made of a mixed soft magnetic material comprising soft magnetic ferrite (MnFe 2 O 4 -ZnFe 2 O 4 ) and nylon 6 is about 3 to 12). Therefore, the inductance of the coils is small, and therefore impedance matching between the coils and a load, that is, the inflating unit can be easily attained.
  • the isolation transformer using the isolation transformer cores comprising the core members described above is suited to transmit large power in a moment.
  • Mn-Zn soft magnetic ferrite (MnFe 2 O 4 -ZnFe 2 O 4 ) powder and Ni-Zn soft magnetic ferrite (NiO-ZnO-Fe 2 O 3 ) powder whose maximum grain diameter was 50 ⁇ m were prepared.
  • insulating materials having an insulating property nylon pellets (nylon 6) and polypropylene pellets as used in ordinary injection molding and the like were prepared. Using these materials, several kinds of mixed powders having different soft magnetic ferrite powder contents were prepared. Each mixed powder was then fused, so that several kinds of mixed soft magnetic materials having different soft magnetic ferrite contents were prepared.
  • the melt flow rate of mixed soft magnetic materials containing nylon 6 as an insulating material was measured by a melt index test in accordance with JIS K 7210. Measurement was performed under the condition that measurement temperature was 270°C and a load was 10.0 kg ⁇ f. When the soft magnetic ferrite content was 5 volume % or lower, the soft magnetic ferrite content had little influence on the melt flow rate. When the soft magnetic ferrite content was 70 volume % or higher, mixing to produce a mixed soft magnetic material was difficult. Therefore, the melt flow rate of mixed soft magnetic materials having the soft magnetic ferrite content of 5 to 65 volume % was measured by the melt index test. The results are shown in FIG. 2.
  • core members were formed as follows:
  • each mixed soft magnetic material was formed into a core member of a predetermined shape, that is, a disc shape having a through-hole 2a at the center and a circular coil groove 2b in the disc face.
  • Injection molding of mixed soft magnetic materials containing nylon 6 as an insulating material was performed under the ordinary condition of injection molding using nylon 6, and injection molding of mixed soft magnetic materials containing polypropylene as an insulating material was performed under the ordinary condition of injection molding using polypropylene.
  • the relative permeability of formed core members was measured in accordance with JIS C2561. The results are shown as the relation between the soft magnetic ferrite content (volume %) and the relative permeability of a core member in FIG. 3, where black circles represent core members using nylon 6 as an insulating material and white circles represent core members using polypropylene as an insulating material.
  • volume resistivity of mixed soft magnetic materials was measured in accordance with JIS H 0505. The results are shown as the relation between the soft magnetic ferrite content (volume %) and the volume resistivity ( ⁇ ⁇ cm) of mixed soft magnetic materials in FIG. 4, where black circles represent mixed soft magnetic materials using Mn-Zn ferrite as a soft magnetic ferrite and white circles represent mixed soft magnetic materials using Ni-Zn ferrite as a soft magnetic ferrite.
  • FIG. 5 shows the relation between the soft magnetic ferrite content (volume %) and the relative permeability, the Sendust content (volume %) and the relative permeability and the permalloy content (volume %) and the relative permeability. This was obtained by calculation based on the measurement results of the soft magnetic ferrite content (volume %) and the relative permeability shown in FIG. 3, using general data on Sendust and permalloy. Soft magnetic ferrite, Sendust and permalloy were used as soft magnetic materials.
  • the soft magnetic ferrite content is higher than 70 volume %, mixing is difficult, and injection molding is difficult due to low flowability. Further, due to an increase of ferrite component having high hardness, a mold for injection molding wears quickly, the mechanical strength of a formed isolation transformer core is much lower, and a core is more difficult to form. Thus, the mixed soft magnetic material having the soft magnetic ferrite content higher than 70 volume % is unsuitable for a transformer core.
  • the soft magnetic ferrite content is in the range of 60 to 70 volume %, the relative permeability of a formed core member is high, but the flowability of a mixed soft magnetic material is relatively low.
  • the mixed soft magnetic material having the soft magnetic ferrite content of this range is suitable for a core which is used in an isolation transformer requiring a relatively high transmission efficiency and does not have a very complicated shape.
  • the soft magnetic ferrite content is in the range of 10 to 60 volume %, the relative permeability of a formed core member is relatively low, but the flowability of a mixed soft magnetic material is high.
  • the mixed soft magnetic material having the soft magnetic ferrite content of this range is suitable for a core which is used in an isolation transformer not requiring a high transmission efficiency and has such a complicated shape that it can be formed only of material having a high flowability.
  • a mixed soft magnetic material containing Ni-Zn ferrite has a high volume resistivity, though it is expensive. It is desirable to use a mixed soft magnetic material containing Ni-Zn ferrite when a mixed soft magnetic material containing Mn-Zn ferrite does not satisfy a required volume resistivity.
  • mixed soft magnetic material having the Mn-Zn soft magnetic ferrite content of 50 ⁇ 3 volume % is particularly favorable.
  • This mixed soft magnetic material has a good flowability and a relatively high melt flow rate, and injection molding thereof is easy.
  • the relative permeability of a core member formed thereof is about 10.
  • an isolation transformer core formed of this mixed soft magnetic material is suitable for a connector for an air bag which has two cores arranged to face each other with a gap of 1 mm therebeteween and needs to be able to surely transmit large power in a moment even if a gap varies in the range of ⁇ 0.5 mm.
  • a core member is made of a mixed soft magnetic material comprising an insulating material having an electrical insulating property and a soft magnetic material.
  • the isolation transformer core has an improved vibration resistance and a lowered fragility.
  • the relative permeability of a coil is relatively low. Therefore, the isolation transformer cores are suited to be arranged to face each other with a gap of about 1 mm therebeteween and transmit large power in a moment.
  • the isolation transformer core of the present invention has the relative permeability required for transmitting large power in a moment, and at the same time a mechanical strength higher than that of a core made of sintered ferrite alone.
  • the isolation transformer core of the present invention uses, as a soft magnetic material, soft magnetic ferrite or Sendust.
  • the isolation transformer core using soft magnetic ferrite is suitable for a high-frequency transformer, because it has only a small eddy-current loss.
  • the isolation transformer core using Sendust is advantageous in that it can be of a small size because it has a high saturation magnetic flux density (twice as high as that of ferrite).
  • the isolation transformer core of the present invention uses, as an insulating material, any of thermoplastic resin, thermoplastic rubber, silicone rubber, thermosetting resin and adhesive which all have flexibility and good formability. Therefore, the isolation transformer core has large shock resistance, and is easy to form even when it has a complicated shape. Thus, the vibration resistance of the isolation transformer core is much improved and manufacturing cost is lowered.
EP99912044A 1998-03-27 1999-03-26 Noyau de transformateur du type a separation Expired - Lifetime EP0986073B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP8165198 1998-03-27
JP8165198 1998-03-27
PCT/JP1999/001567 WO1999050858A1 (fr) 1998-03-27 1999-03-26 Noyau de transformateur du type a separation

Publications (3)

Publication Number Publication Date
EP0986073A1 true EP0986073A1 (fr) 2000-03-15
EP0986073A4 EP0986073A4 (fr) 2006-09-20
EP0986073B1 EP0986073B1 (fr) 2011-02-09

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EP99912044A Expired - Lifetime EP0986073B1 (fr) 1998-03-27 1999-03-26 Noyau de transformateur du type a separation

Country Status (6)

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EP (1) EP0986073B1 (fr)
JP (1) JP4278719B2 (fr)
KR (1) KR100533494B1 (fr)
CA (1) CA2291104C (fr)
DE (1) DE69943179D1 (fr)
WO (1) WO1999050858A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2976152A1 (fr) * 2011-05-31 2012-12-07 Renault Sa Ecran de blindage magnetique pour charge sans contact d'une batterie d'un vehicule automobile
EP2928039A1 (fr) * 2014-04-03 2015-10-07 LG Innotek Co., Ltd. Appareil de transmission de puissance sans fil
WO2015173196A1 (fr) * 2014-05-14 2015-11-19 Dsm Ip Assets B.V. Composition de matériau magnétique doux et composant constitué du matériau
CN105684107A (zh) * 2013-11-01 2016-06-15 户田工业株式会社 软磁性铁氧体树脂组合物、软磁性铁氧体树脂组合物成型体和非接触供电***用电力传送装置
EP3029690A3 (fr) * 2014-11-17 2016-08-31 LG Innotek Co., Ltd. Alliage magnétique doux, appareil de transmission de puissance sans fil et appareil de réception de puissance sans fil comprenant celui-ci

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Publication number Priority date Publication date Assignee Title
CA2373434C (fr) * 2000-03-08 2008-05-06 The Furukawa Electric Co., Ltd Procede permettant de diagnostiquer un etat anormal d'un transformateur d'isolation et dispositif associe

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US4320080A (en) * 1978-03-22 1982-03-16 Robert Bosch Gmbh Method to manufacture soft magnetic pressed bodies
US4543208A (en) * 1982-12-27 1985-09-24 Tokyo Shibaura Denki Kabushiki Kaisha Magnetic core and method of producing the same
JPS62188303A (ja) * 1986-02-14 1987-08-17 Shigeo Fukuda ビデオテ−プレコダ−に於けるロ−タリ−トランスの磁心コアの製法
US5160447A (en) * 1988-02-29 1992-11-03 Kabushiki Kaisha Sankyo Seiki Seisakusho Compressed powder magnetic core and method for fabricating same
EP0587142A2 (fr) * 1992-09-09 1994-03-16 Matsushita Electric Industrial Co., Ltd. Transformateur tournant

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JPH07307237A (ja) * 1994-05-13 1995-11-21 Tokin Corp ロータリートランスの製造方法及びそれに用いる磁性材料

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US4320080A (en) * 1978-03-22 1982-03-16 Robert Bosch Gmbh Method to manufacture soft magnetic pressed bodies
US4543208A (en) * 1982-12-27 1985-09-24 Tokyo Shibaura Denki Kabushiki Kaisha Magnetic core and method of producing the same
JPS62188303A (ja) * 1986-02-14 1987-08-17 Shigeo Fukuda ビデオテ−プレコダ−に於けるロ−タリ−トランスの磁心コアの製法
US5160447A (en) * 1988-02-29 1992-11-03 Kabushiki Kaisha Sankyo Seiki Seisakusho Compressed powder magnetic core and method for fabricating same
EP0587142A2 (fr) * 1992-09-09 1994-03-16 Matsushita Electric Industrial Co., Ltd. Transformateur tournant

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Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 035 (E-579), 2 February 1988 (1988-02-02) & JP 62 188303 A (SHIGEO FUKUDA), 17 August 1987 (1987-08-17) *
See also references of WO9950858A1 *

Cited By (11)

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KR100533494B1 (ko) 2005-12-06
KR20010012948A (ko) 2001-02-26
WO1999050858A8 (fr) 1999-12-02
CA2291104A1 (fr) 1999-10-07
WO1999050858A1 (fr) 1999-10-07
EP0986073B1 (fr) 2011-02-09
JP4278719B2 (ja) 2009-06-17
CA2291104C (fr) 2010-11-30
EP0986073A4 (fr) 2006-09-20
DE69943179D1 (de) 2011-03-24

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