WO2012029219A1 - 電磁開閉器 - Google Patents
電磁開閉器 Download PDFInfo
- Publication number
- WO2012029219A1 WO2012029219A1 PCT/JP2011/003382 JP2011003382W WO2012029219A1 WO 2012029219 A1 WO2012029219 A1 WO 2012029219A1 JP 2011003382 W JP2011003382 W JP 2011003382W WO 2012029219 A1 WO2012029219 A1 WO 2012029219A1
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- WO
- WIPO (PCT)
- Prior art keywords
- contact
- iron core
- magnetic yoke
- movable
- electromagnetic switch
- Prior art date
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 82
- 230000005284 excitation Effects 0.000 claims description 13
- 238000004804 winding Methods 0.000 description 11
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/546—Contact arrangements for contactors having bridging contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/16—Magnetic circuit arrangements
- H01H50/18—Movable parts of magnetic circuits, e.g. armature
- H01H50/34—Means for adjusting limits of movement; Mechanical means for adjusting returning force
Definitions
- the present invention relates to an electromagnetic switch comprising a contact device having a stationary contact and a movable contact inserted in a current path, and an electromagnet for driving the movable contact.
- a hollow cavity is formed by an annular core base top, an annular core base bottom, and a core outer wall connecting between the core base top and the outer periphery of the core base bottom.
- An excitation coil is mounted in the hollow cavity, and a cylindrical core center is inserted into the central opening at the top of the core base to form a core assembly.
- a bottomed cylindrical member is externally fitted to the outer periphery of the core center.
- a movable plunger facing the lower surface of the core center through a predetermined gap is disposed in the bottomed cylindrical member, and an armature shaft that extends upward through the core center and holds a movable contact is provided on the plunger.
- a fixed hermetic relay device has been proposed (see, for example, Patent Document 1).
- a first yoke and a second yoke having a movable iron core are slidably disposed on an inner peripheral surface of the second yoke, and a movable contact is held on the movable iron core via a connecting shaft.
- the contact surface of the core center serving as the fixed iron core and the contact surface of the plunger serving as the movable iron core are separated from each other by a predetermined gap on the inner peripheral side of the exciting coil.
- a bottomed cylindrical member that is externally fitted to the outer peripheral surface of the core center is required to guide the movable iron core.
- a bottomed cylindrical member is required to guide the movable iron core, the number of parts increases, the inner diameter of the bottomed cylindrical member needs to be highly accurate, and the bottomed cylindrical member is specially drawn. Therefore, there are unsolved problems such as an increase in manufacturing cost.
- a special bottomed cylindrical member is not required, but the movable iron core is guided by the second yoke. Therefore, the inner diameter of the second yoke is increased.
- the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and it is not necessary to form a guide surface for guiding the movable iron core in the exciting coil, and the suction force can be efficiently generated with a small stroke. It aims at providing the electromagnetic switch which can output to.
- a first aspect of an electromagnetic switch provides a pair of fixed contacts and a pair of fixed contacts that are fixed within an arc extinguishing chamber container at a predetermined interval.
- a contact device having a movable contact arranged so as to be able to contact and separate, and an electromagnet device for driving the movable contact, the electromagnet device having a cylindrical excitation coil and a center of the excitation coil
- a stationary iron core that passes through, a magnetic yoke that covers the outside of the exciting coil, and a movable iron core that faces the stationary iron core and the magnetic yoke, and the contact surfaces of the stationary iron core and the magnetic yoke are It was formed on the contact device side.
- the contact surface of the fixed iron core and the magnetic yoke is formed on the contact device side of the exciting coil, there is no need to provide a movable iron core in the exciting coil, and the armature is increased while increasing the coil winding amount.
- the area can be increased.
- the 2nd aspect of the electromagnetic switch which concerns on this invention is set as the structure which formed the 3 or more armature surface in the said fixed iron core and the said magnetic yoke. According to this configuration, since the three or more contact surfaces are formed on the fixed core and the magnetic yoke, the contact area can be easily increased.
- the electromagnetic switch according to a third aspect of the present invention is the electromagnetic switch according to the present invention, wherein the fixed iron core includes a bar portion inserted into the excitation coil and the excitation coil connected to an end of the bar portion on the contact device side.
- the magnetic yoke is formed in a T shape with a flat plate portion covering the contact device side end, and the magnetic yoke is opposed to at least two or more ends of the flat plate portion of the fixed iron core via a magnetic gap. It has a plate part.
- one armature surface constituting the magnetic circuit is formed by the flat plate portion of the fixed iron core on the contact device side of the exciting coil, and the other two or more armature surfaces are formed by the opposing plate portion of the magnetic yoke. It is possible to increase the contact area while increasing the coil winding amount.
- the opposing plate portion of the magnetic yoke is covered with a nonmagnetic member.
- the opposing plate portion of the magnetic yoke can be opposed to the movable iron core via the nonmagnetic gap, and release characteristics when the contact device is opened can be ensured.
- the 5th aspect of the electromagnetic switch which concerns on this invention comprises the said nonmagnetic member with the said arc-extinguishing chamber container. According to this configuration, it is not necessary to prepare a nonmagnetic member separately, and the number of parts can be reduced.
- the movable iron core is urged toward the contact device side by a return elastic body and is guided up and down by a guide member.
- the holding contactor holder is fixed. According to this configuration, the movable iron core can be guided up and down by the guide member in the arc extinguishing chamber container.
- the movable iron core since the contact surface of the movable iron core and the fixed iron core of the electromagnet device is formed on the contact device side from the exciting coil, the movable iron core is not disposed at the center of the exciting coil. Since there is no need to provide a guide member for guiding the number of parts, the number of parts can be reduced by this amount, and since only the fixed iron core has to be disposed without providing a contact surface on the center side of the excitation coil, It is possible to increase the winding amount, and further, it is possible to secure a large contact area between the fixed iron core and the movable iron core, and to obtain an effect that the suction force can be efficiently output with a small stroke. .
- FIG. 2 is a sectional view taken along line AA in FIG. 1.
- FIG. 1 is a sectional view showing an example in which the contact device of the present invention is applied to an electromagnetic contactor as an electromagnetic switch.
- reference numeral 1 denotes a contact device
- a DC operation type electromagnet device 2 is disposed on the lower surface side of the contact device 1.
- the contact device 1 has an arc-extinguishing chamber container 3 made of, for example, a non-magnetic material and a non-ferrous metal or synthetic resin subjected to insulation treatment, and the contact mechanism 4 is disposed in the arc-extinguishing chamber container 3.
- the arc-extinguishing chamber container 3 includes a bottomed cylindrical body 3a whose lower end surface is opened and a bottom plate portion 3b that closes the lower end surface of the bottomed cylindrical body 3a.
- the bottom plate portion 3b has a convex portion 3c projecting downward in the central portion, and an insertion hole 3d through which a shaft portion 12a of the fixed iron core 12 described later is inserted is formed at the center position of the convex portion 3c.
- the contact mechanism 4 includes fixed contacts 4 a and 4 b and a movable contact 5.
- the fixed contacts 4a and 4b are fixedly supported on the opposing wall surface of the bottomed cylindrical body 3a of the arc-extinguishing chamber container 3 by separating the inner end by a predetermined distance and projecting the outer end to the outside of the arc-extinguishing chamber container 3.
- the movable contact 5 is formed in a flat plate shape, and is opposed to the upper end side of the fixed contacts 4a and 4b so as to be able to contact and separate at a predetermined distance.
- the movable contact 5 is attached to the contact holder 6 while being urged downward by a contact spring 7.
- an electromagnet device 2 is disposed on the lower surface side of the arc extinguishing chamber container 3.
- the electromagnet device 2 includes a coil bobbin 10 including a cylindrical portion 10a whose axial direction is the vertical direction and flange portions 10b and 10c that protrude outward from both ends thereof.
- An exciting coil 11 is wound around a cylindrical space surrounded by the cylindrical portion 10a and the flange portions 10b and 10c of the coil bobbin 10.
- the fixed iron core 12 is inserted through the inner peripheral surface of the cylindrical portion 10a of the coil bobbin 10.
- the fixed iron core 12 is formed in a T shape by a shaft portion 12a inserted into the cylindrical portion 10a of the coil bobbin 10 and a flat plate portion 12b extending in a direction perpendicular to the axis from the upper end of the shaft portion 12a on the contact device 1 side. ing.
- the upper surface of the flat plate portion 12 b is set to be lower than the upper surface of the bottom plate portion 3 b of the arc extinguishing chamber container 3.
- a magnetic yoke 13 is disposed outside the coil bobbin 10.
- the magnetic yoke 13 includes a bottom plate portion 13a that supports the flange portion 10c, a cylindrical portion 13b that extends upward from the outer peripheral edge of the bottom plate portion 13a, and a flat plate portion of the fixed iron core 12 that extends inward from the upper end of the cylindrical portion 13b. It is comprised with a pair of flange part 13c as an opposing board part which opposes the outer end of 12b through a predetermined gap.
- the flat plate part 12b of the fixed iron core 12 is fixed inside the convex part 3c formed in the bottom plate part 3b of the arc-extinguishing chamber container 3 described above, and the upper surface of the flange part 13c of the magnetic yoke 13 is the arc-extinguishing chamber container. 3 is in contact with the lower surface of the outer side of the convex portion 3c in the bottom plate portion 3b. That is, the upper surface of the flange portion 13 c of the magnetic yoke 13 is covered with the bottom plate portion 3 b of the arc extinguishing chamber container 3 to form a nonmagnetic gap.
- the movable iron core 14 is movably arranged in the vertical direction so as to face the flat plate portion 12 b of the fixed iron core 12 of the electromagnet device 2 and the flange portion 13 c of the magnetic yoke 13 from above. Yes.
- the movable iron core 14 is formed in a flat plate shape, and guide recesses 14a and 14b having a semicircular cross section, for example, are formed at both front and rear ends thereof.
- These guide recesses 14a and 14b are guide members formed with semicircular guide projections 15a and 15b that engage with a pair of front and rear guide recesses 14a and 14b that are formed to project upward from the bottom plate portion of the arc-extinguishing chamber container 3. It is guided in the vertical direction by 15c and 15d.
- a return spring 16 as a return elastic member is disposed between the upper surface of the fixed iron core 12 and the lower surface of the movable iron core 14, and the movable iron core 14 is separated upward from the flat plate portion 12 b of the fixed iron core 12 by the return spring 16. It is energized in the direction to do. As shown in FIG. 1, the upper position of the movable iron core 14 is regulated by locking pieces 15e and 15f formed on the upper portions of the guide members 15c and 15d.
- a contact holder 6 is fixed to the center of the upper surface of the movable core 14 and extends upward through the fixed contacts 4a and 4b.
- a flat plate portion 12b of the fixed iron core 12 on the outer side of the exciting coil 11 of the electromagnet device 2 on the contact device 1 side, a flat plate portion 12b of the fixed iron core 12, and both left and right end portions of the flat plate portion 12b are provided with a predetermined gap in the horizontal direction.
- a pair of flange portions 13c of the opposing magnetic yoke 13 is disposed.
- the flat plate portion 12b of the fixed iron core 12 forms one armature surface Fa constituting the magnetic circuit, and the two armature surfaces Fb and Fc in which the pair of flange portions 13c of the magnetic yoke 13 serve as the other armature surface.
- the movable iron core 14 is biased upward by the return spring 16 so as to be separated from the flat plate portion 12b of the fixed iron core 12, and the upper surface of the movable iron core 14 is formed on the upper surfaces of the guide members 15c and 15d.
- the upper position is regulated by contacting the pieces 15e and 15f.
- a gap of, for example, about 2 mm is formed between the upper surface of the flat plate portion 12b of the fixed iron core 12 and the lower surface of the movable iron core 14.
- the movable contact 5 held by the contact holder 6 formed on the movable iron core 14 is urged downward by the contact spring 7, but between the movable contact 5 and the fixed contacts 4a and 4b. Is about 2 mm apart, the contact device 1 is in an open state, and the electric power supplied to the one fixed contact 4a is not supplied to the fixed contact 4b side, and is in a power cut-off state.
- the movable iron core 14 moves downward to come into contact with the upper surface of the bottom plate portion 3 b of the arc extinguishing chamber container 3, and the lower surface of the movable iron core 14 is a pair of flange portions 13 c of the magnetic yoke 13 and the bottom plate of the arc extinguishing chamber container 3. It will oppose through the nonmagnetic gap formed in the part 3b.
- the movable contact 5 held by the contact holder 6 formed on the movable iron core 14 also moves downward, and contacts with the contact pressure by the contact spring 7 between the fixed contacts 4a and 4b. Thereby, between the fixed contacts 4a and 4b is brought into conduction by the movable contact 5, and the contact device 1 is closed.
- the coil bobbin 10 in which the contact surfaces Fa, Fb, and Fc formed by the fixed iron core 12 of the electromagnet device 2 and the pair of flange portions 13c of the magnetic yoke 13 are wound with the exciting coil 11 is provided. Is formed on the contact device 1 side. For this reason, only the shaft portion 12a of the fixed iron core 12 is inserted into the exciting coil 11, and there is no movable portion. Therefore, there is no need to arrange a guide member in the exciting coil 11, and the number of parts accordingly. Can be reduced.
- the shaft portion 12a of the fixed core 12 inserted into the exciting coil 11 only needs to form a magnetic path, a large cross-sectional area is not required, and the inner diameter of the cylindrical portion 10a of the coil bobbin 10 is reduced. Thus, it is possible to secure a sufficient amount of winding of the exciting coil 11 wound around the coil bobbin 10 and secure a magnetic flux.
- the bottom plate part 3b of the arc-extinguishing chamber container 3 can be used for the nonmagnetic gap necessary for ensuring the release characteristics of the movable contactor 5 from the closed state to the open state of the contact device 1, it is possible to use separately. It is not necessary to form a nonmagnetic gap, and the number of parts can be reduced by this amount.
- the flat plate portion 12b of the fixed iron core 12 is formed in the arc-extinguishing chamber container 3 as described above. As a result, it is possible to reduce the magnetic resistance and ensure the necessary magnetic characteristics.
- the flat plate part 12b of the stationary iron core 12 in the electromagnet apparatus 2 was arrange
- the flat plate portion 12b of the fixed iron core 12 may be disposed outside the arc-extinguishing chamber container 3.
- the present invention is not limited to this, and the flange portion 13c of the magnetic yoke 13 is fixed to the fixed iron core 12. It may be provided on the other facing surface of the flat plate portion 12b to form three or more contact surfaces.
- this invention can be applied to other electromagnetic switches, such as an electromagnetic relay. .
- the contact surface of the movable iron core and the fixed iron core of the electromagnet device is formed on the contact device side from the exciting coil, it is possible to reduce the number of parts and increase the winding amount of the exciting coil. Furthermore, it is possible to provide an electromagnetic switch that can output a suction force efficiently with a small stroke.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electromagnets (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
- Contacts (AREA)
Abstract
Description
また、特許文献2に記載された従来例にあっては、特殊な有底円筒部材を必要としないものの、可動鉄心を第2のヨークで案内するので、この第2のヨークの内径寸法を高精度にする必要があると共に、前述した特許文献1に記載された従来例と同様に接極面積の拡大とコイル巻装量の増加とがトレードオフの関係にあり、小ストロークで吸引力を効率的に出力することができないという未解決の課題がある。
また、本発明に係る電磁開閉器の第2の態様は、前記固定鉄心と前記磁気ヨークとに3以上の接極面を形成した構成とされている。
この構成によると、固定鉄心と磁気ヨークとに3つ以上の接極面が形成されているので、接極面積の増加を容易に行うことができる。
この構成によると、磁気ヨークの対向板部を、非磁性ギャップを介して可動鉄心に対向させることができ、接点装置の開成時の釈放特性を確保することができる。
また、本発明に係る電磁開閉器の第5の態様は、前記非磁性部材を、前記消弧室容器で構成している。
この構成によると、非磁性部材を別途用意する必要がなく、部品点数を減少させることができる。
この構成によると、消弧室容器内で可動鉄心をガイド部材によって昇降可能に案内することができる。
図1は本発明の接点装置を電磁開閉器としての電磁接触器に適用した場合の一例を示す断面図である。この図1において、1は接点装置であって、この接点装置1の下面側に直流操作形の電磁石装置2が配設されている。
接点装置1は、例えば非磁性体且つ絶縁処理を施した非鉄金属又は合成樹脂製等の消弧室容器3を有し、この消弧室容器3内に接点機構4が配設されている。消弧室容器3は、下端面が開放された有底筒体3aと、この有底筒体3aの下端面を閉塞する底板部3bとで構成されている。底板部3bは、中央部に下方に突出する凸部3cを有し、この凸部3cの中心位置に後述する固定鉄心12の軸部12aを挿通する挿通孔3dが形成されている。
また、可動接触子5は、平板状に形成され、固定接触子4a,4bの上端側に所定距離を隔てて接離自在に対向配置されている。この可動接触子5は接触子ホルダ6に接触スプリング7によって下方に付勢されて装着されている。
この実施形態においては、電磁石装置2の励磁コイル11の接点装置1側の外側に、固定鉄心12の平板部12bと、この平板部12bの左右方向の両端部に水平方向に所定ギャップを介して対向する磁気ヨーク13の一対のフランジ部13cとが配設されている。したがって、固定鉄心12の平板部12bが磁気回路を構成する一方の接極面Faを形成し、磁気ヨーク13の一対のフランジ部13cが他方の接極面となる2つの接極面Fb及びFcを形成する。
今、電磁石装置2の励磁コイルが直流電流を供給しない非通電状態であるときには、固定鉄心12及び磁気ヨーク13で形成される磁気回路には磁束が流れず、固定鉄心12と磁気ヨーク13の一対のフランジ部13cとで形成される3つの接極面Fa、Fb及びFcでは吸引力が働かない状態となっている。
これに加えて、固定鉄心12と磁気ヨーク13の一対のフランジ部13cとで形成される3つの接極面Fa、Fb及びFcはコイルボビン10の接点装置1側に形成されており、コイル巻装量とのトレードオフを生じることはなく、広い接極面積を確保することができるので、電磁石装置2によって小ストロークで吸引力を効率的に出力することができる。
さらに、上記実施形態においては、本発明を電磁接触器に適用した場合について説明したが、これに限定されるものではなく、電磁継電器などの他の電磁開閉器に本発明を適用することができる。
Claims (6)
- 消弧室容器内に所定間隔を保って固定された一対の固定接触子と該一対の固定接触子に対して接離可能に配設された可動接触子とを有する接点装置と、
前記可動接触子を駆動する電磁石装置とを備え、
前記電磁石装置は、筒状の励磁コイルと、該励磁コイルの中心を通る固定鉄心と、前記励磁コイルの外側を覆う磁気ヨークと、前記固定鉄心及び前記磁気ヨークと対向する可動鉄心とを有し、前記固定鉄心及び前記磁気ヨークの接極面を前記励磁コイルより前記接点装置側に形成したことを特徴とする電磁開閉器。 - 前記固定鉄心と前記磁気ヨークとに3以上の接極面が形成されていることを特徴とする請求項1に記載の電磁開閉器。
- 前記固定鉄心は前記励磁コイルに挿通される棒部と該棒部の前記接点装置側の端部に連結された前記励磁コイルの前記接点装置側端部を覆う平板部とでT字状に形成され、前記磁気ヨークは前記固定鉄心の前記平板部における少なくとも2以上の端部に対して磁気ギャップを介して対向する2以上の対向板部を有することを特徴とする請求項1又は2に記載の電磁開閉器。
- 前記磁気ヨークの対向板部は、非磁性部材で覆われていることを特徴とする請求項3に記載の電磁開閉器。
- 前記非磁性部材は、前記消弧室容器であることを特徴とする請求項4に記載の電磁開閉器。
- 前記可動鉄心は、復帰弾性体によって前記接点装置側に付勢され、且つガイド部材によって昇降可能に案内され、さらに前記可動接触子を保持する接触子ホルダが形成されていることを特徴とする請求項1乃至5の何れか1項に記載の電磁開閉器。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN201180005066.4A CN102668005B (zh) | 2010-08-31 | 2011-06-14 | 电磁开关 |
EP11821244.8A EP2613334B1 (en) | 2010-08-31 | 2011-06-14 | Electromagnetic switch |
US13/519,782 US8570125B2 (en) | 2010-08-31 | 2011-06-14 | Electromagnetic switch |
KR1020137006021A KR101480963B1 (ko) | 2010-08-31 | 2011-06-14 | 전자 개폐기 |
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JP2010-194464 | 2010-08-31 | ||
JP2010194464A JP5385877B2 (ja) | 2010-08-31 | 2010-08-31 | 電磁開閉器 |
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WO2012029219A1 true WO2012029219A1 (ja) | 2012-03-08 |
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US (1) | US8570125B2 (ja) |
EP (1) | EP2613334B1 (ja) |
JP (1) | JP5385877B2 (ja) |
KR (1) | KR101480963B1 (ja) |
CN (1) | CN102668005B (ja) |
WO (1) | WO2012029219A1 (ja) |
Cited By (2)
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WO2013170508A1 (zh) * | 2012-05-18 | 2013-11-21 | Zhou Wei | 用于动铁式扬声器或受话器的磁轭装置 |
WO2023281980A1 (ja) * | 2021-07-08 | 2023-01-12 | 富士電機機器制御株式会社 | 非磁性板、電磁接触器、非磁性素材、および製造方法 |
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JP5307779B2 (ja) * | 2010-08-31 | 2013-10-02 | 富士電機機器制御株式会社 | 電磁開閉器 |
JP5838920B2 (ja) * | 2011-07-18 | 2016-01-06 | アンデン株式会社 | 継電器 |
JP5856426B2 (ja) * | 2011-10-07 | 2016-02-09 | 富士電機株式会社 | 接点装置及びこれを使用した電磁接触器 |
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Also Published As
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CN102668005B (zh) | 2016-03-23 |
US8570125B2 (en) | 2013-10-29 |
JP5385877B2 (ja) | 2014-01-08 |
JP2012054048A (ja) | 2012-03-15 |
EP2613334A4 (en) | 2014-10-15 |
CN102668005A (zh) | 2012-09-12 |
EP2613334A1 (en) | 2013-07-10 |
KR101480963B1 (ko) | 2015-01-09 |
EP2613334B1 (en) | 2015-09-02 |
KR20130116865A (ko) | 2013-10-24 |
US20120326815A1 (en) | 2012-12-27 |
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