JP4601693B2

JP4601693B2 - Electromagnetic relay

Info

Publication number: JP4601693B2
Application number: JP2008230125A
Authority: JP
Inventors: 進一佐藤; 良夫岡本; 茂光青木; 恵司池田; 真人森村
Original assignee: Fujitsu Component Ltd
Current assignee: Fujitsu Component Ltd
Priority date: 2008-09-08
Filing date: 2008-09-08
Publication date: 2010-12-22
Anticipated expiration: 2019-04-15
Also published as: JP2009009950A

Description

本発明は、電磁継電器に係わり、特に、高電圧を遮断することが可能な小型電磁継電器に関する。 The present invention relates to an electromagnetic relay, and more particularly to a small electromagnetic relay capable of interrupting a high voltage.

近年、自動車に搭載される部品（例えばサイドミラー、座席）の電動化が進んでおり、電動アクチュエータである電動機あるいはソレノイドへの電力の供給を制御するために、電磁継電器が使用される場合が多いが、車載用電磁継電器は小型であることが要求されることがいうまでもない。 In recent years, parts (for example, side mirrors and seats) mounted on automobiles have been electrified, and electromagnetic relays are often used to control power supply to electric motors or solenoids that are electric actuators. However, it goes without saying that the in-vehicle electromagnetic relay is required to be small.

また、電動化部品の増大に対して、従来のように低電圧で電力を供給する場合には、電力伝送用のワイヤーハーネスの線径が大となり、ワイヤーハーネスの重量の増加、高価格化を招くため、現在使用されている端子電圧が１２〜１６Ｖの蓄電池に代えて、４０〜６０Ｖの端子電圧を有する蓄電池を使用することが検討されている。 In addition, when power is supplied at a low voltage as in the past in contrast to the increase in electrified components, the diameter of the wire harness for power transmission becomes large, increasing the weight of the wire harness and increasing the price. Therefore, it is considered to use a storage battery having a terminal voltage of 40 to 60 V instead of a storage battery having a terminal voltage of 12 to 16 V currently used.

従って、電動アクチュエータへの電力の供給を制御するために、現在は、低電圧を遮断することの可能な電磁継電器が使用されているが、今後は、高電圧を遮断することの可能な電磁継電器を使用することが要求される。 Therefore, in order to control the supply of electric power to the electric actuator, an electromagnetic relay capable of interrupting a low voltage is currently used, but in the future, an electromagnetic relay capable of interrupting a high voltage is used. Is required to use.

実願昭４９−６６０号（実開昭５０−９５５５９号）のマイクロフィルムMicrofilm of Japanese Utility Model No. 49-660 (Japanese Utility Model Application No. 50-95559) 特開平８−１９５１５３号公報JP-A-8-195153

しかしながら、低電圧遮断用電磁継電器で高電圧を遮断した場合には、遮断時のアーク継続時間が長くなって、接点の溶着、スティッキングが発生し易くなるため、電磁継電器接点の寿命が短くなる。電磁継電器接点の寿命を長くするために、接点間隔を広げる方法が公知である。しかし、接点間隔を広げた場合には、単に接点を大型化する必要があるだけでなく、接点操作用の磁力を増加するために電磁コイルをも大型化することが必要であるため、電磁継電器全体が大型となることは避けることができない。 However, when a high voltage is cut off by the low voltage cut-off electromagnetic relay, the arc continuation time at the cut-off becomes longer, and contact welding and sticking are likely to occur, so the life of the electromagnetic relay contact is shortened. In order to extend the life of the electromagnetic relay contact, a method of increasing the contact interval is known. However, when the contact interval is widened, it is not only necessary to increase the contact size, but also to increase the size of the electromagnetic coil in order to increase the magnetic force for contact operation, the electromagnetic relay The overall size cannot be avoided.

本発明は、上記課題に鑑み成されたものであって、高電圧遮断用に使用した場合にも、接点寿命が短くならないだけでなく、小型化が可能な電磁継電器を提供することを目的とする。 The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electromagnetic relay that can be miniaturized as well as shortening the contact life even when used for high voltage interruption. To do.

本発明に係る電磁継電器は、鉄芯に巻回された第１コイルと、該第１コイルへの電力の供給により前記鉄芯に吸引されたときにメイク接点に接触する共通接点を有する接極子と、前記鉄芯の端部において前記メイク接点の方向に延びる延長継鉄に巻回された第２コイルと、を備え、前記第１コイルへの電力が停止されたとき、該第１コイルに発生する逆起電力が前記第２コイルに供給され、該第２コイルが、前記延長継鉄の端部から前記共通接点と前記メイク接点との間に向けて磁束を発生することとした。 An electromagnetic relay according to the present invention includes a first coil wound around an iron core, and an armature having a common contact that contacts a make contact when attracted to the iron core by supplying power to the first coil. And a second coil wound around an extension yoke extending in the direction of the make contact at the end of the iron core, and when the power to the first coil is stopped, the first coil The generated back electromotive force is supplied to the second coil, and the second coil generates a magnetic flux from the end of the extended yoke toward the common contact and the make contact.

さらに、励磁電源が、前記第１コイルの巻き始め端と巻き終わり端との間にスイッチング素子を介して接続され、前記第２コイルの巻き始め端が、前記第１コイルの巻き始め端に接続され、該第２コイルの巻き終わり端が、逆流防止ダイオードを介して該第１コイルの巻き終わり端に接続され、前記スイッチング素子がオンからオフにされて、前記励磁電源から前記第１コイルへの電力の供給が停止されたとき、前記第２コイルが、前記磁束を発生することとした。 Further, an excitation power source is connected between the winding start end and the winding end end of the first coil via a switching element, and the winding start end of the second coil is connected to the winding start end of the first coil. And the end of winding of the second coil is connected to the end of winding of the first coil via a backflow prevention diode, and the switching element is turned off to turn off the excitation power source to the first coil. When the supply of power is stopped, the second coil generates the magnetic flux.

また、本発明の電磁継電器では、前記鉄芯に巻回された第３コイルを有し、該第３コイルは、前記第１コイルへの電力が停止されたとき、該第１コイルに発生する逆起電力による励磁電流を発生し、前記第２コイルが、前記励磁電流の供給により前記磁束を発生することとした。 The electromagnetic relay according to the present invention further includes a third coil wound around the iron core, and the third coil is generated in the first coil when power to the first coil is stopped. An excitation current is generated by back electromotive force, and the second coil generates the magnetic flux by supplying the excitation current.

さらに、励磁電源が、前記第１コイルの巻き始め端と巻き終わり端との間にスイッチング素子を介して接続され、前記第２コイルの巻き終わり端と前記第３コイルの巻き終わり端が前記第１コイルの巻き始め端に接続され、該第２コイルの巻き始め端と前記第３コイルの巻き始め端とが接続されることとした。 Further, an excitation power source is connected between a winding start end and a winding end end of the first coil via a switching element, and the winding end end of the second coil and the winding end end of the third coil are connected to the first winding end. The winding start end of one coil is connected, and the winding start end of the second coil and the winding start end of the third coil are connected.

本発明に係る電磁継電器によれば、回路を遮断するときに発生する逆起電力により生成される磁界とアーク中を流れる電流によって、アークは共通接点とメイク接点の間から移動させられ、接点間に発生するアークを消すことができ、共通接点とメイク接点とが開離する際に共通接点とメイク接点の間におけるアークの発生による接点の磨耗が減少し、電磁継電器の寿命を延長することが可能となるだけでなく、接点間隔を小さくすることもできるため、電磁継電器を小型化することも可能となる。 According to the electromagnetic relay according to the present invention, the arc is moved from between the common contact and the make contact by the magnetic field generated by the counter electromotive force generated when the circuit is interrupted and the current flowing in the arc, and between the contacts. Can be extinguished, and when the common contact and make contact are separated, the wear of the contact due to the generation of arc between the common contact and make contact is reduced, and the life of the electromagnetic relay can be extended. Not only becomes possible, but also the contact interval can be reduced, so that the electromagnetic relay can be reduced in size.

本分割出願の元となった出願では、直列接続された２つ以上の開閉回路を使用して回路を遮断することによって、遮断時に発生するアーク継続時間を短縮して接点寿命を確保した電磁継電器が提案された。つまり、この電磁継電器では、接極子を吸引するためのコイルへの電力の供給が停止されたとき、負荷が短絡されるように、開閉回路の接続を工夫した。これに対して、本出願の電磁継電器では、接点近傍に磁石を配置し磁力によりアークを消す磁気アーク消弧を採用することにより、接点寿命を延ばすことも可能であることを利用した。 In the application that was the basis of this divisional application, an electromagnetic relay that uses two or more open / close circuits connected in series to cut off the circuit, thereby shortening the arc duration generated at the time of interruption and ensuring the contact life Was proposed. That is, in this electromagnetic relay, the connection of the switching circuit is devised so that the load is short-circuited when the supply of power to the coil for attracting the armature is stopped. On the other hand, the electromagnetic relay of the present application utilizes the fact that the contact life can be extended by employing a magnetic arc extinguishing method in which a magnet is disposed in the vicinity of the contact and the arc is extinguished by a magnetic force.

図１は、磁石を配置した場合における磁気アーク消弧型電磁継電器の原理図であって、Ｕ字型の継鉄９１の一方の腕には主コイル９２が巻回される。
継鉄９１の他方の腕の上部には可動バネ９３が取り付けられるが、可動バネ９３はほぼ直角に折り曲げられて継鉄９１の一方の腕を越えて延びるが、この部分には一端が継鉄９１の一方の腕に接する接極子９４が取り付けられる。なお、接極子９４は、継鉄９１の一方の腕を覆う大きさを有し、主コイル９２を励磁したときにＵ字型の継鉄９１の開口部を短絡し閉磁路を構成する機能を有する。 FIG. 1 is a principle diagram of a magnetic arc extinguishing electromagnetic relay when magnets are arranged. A main coil 92 is wound around one arm of a U-shaped yoke 91.
A movable spring 93 is attached to the upper portion of the other arm of the yoke 91. The movable spring 93 is bent substantially at a right angle and extends beyond one arm of the yoke 91. An armature 94 in contact with one arm of 91 is attached. The armature 94 has a size that covers one arm of the yoke 91 and has a function of short-circuiting the opening of the U-shaped yoke 91 when the main coil 92 is excited to form a closed magnetic circuit. Have.

可動バネ９３の延長端には共通接点Ｃが形成され、共通接点Ｃの上方対向位置にはブレーク接点Ｂが、下方対向位置にはメイク接点Ｍが配置される。さらに、共通接点Ｃとメイク接点Ｍの近傍には、共通接点Ｃとメイク接点Ｍの間の空隙に磁界が形成されるように磁石９５が配置される。 A common contact C is formed at the extended end of the movable spring 93. A break contact B is disposed at an upper position opposite the common contact C, and a make contact M is disposed at a lower position. Further, in the vicinity of the common contact C and the make contact M, a magnet 95 is arranged so that a magnetic field is formed in the gap between the common contact C and the make contact M.

即ち、主コイル９２が励磁されると共通接点Ｃとメイク接点Ｍとが接触し、主コイル９２が無励磁とされると共通接点Ｃとメイク接点Ｍとが開離するが、共通接点Ｃとメイク接点Ｍを開離して回路を遮断する際に共通接点Ｃとメイク接点Ｍとの間にアークが発生する。アーク中を流れる電流と共通接点Ｃとメイク接点Ｍの間の空隙に存在する磁界の双方に直角方向にアークにフレミングの左手の法則に基づく力が作用し、アークは接点の外部に押し出されるため、アークによる接点の磨耗が抑制される。 That is, when the main coil 92 is energized, the common contact C and the make contact M are brought into contact, and when the main coil 92 is de-energized, the common contact C and the make contact M are separated. An arc is generated between the common contact C and the make contact M when the make contact M is opened to break the circuit. A force based on Fleming's left-hand rule acts on the arc in a direction perpendicular to both the current flowing in the arc and the magnetic field existing in the gap between the common contact C and the make contact M, and the arc is pushed out of the contact. The contact wear due to the arc is suppressed.

磁気アーク消弧型電磁継電器では磁石として永久磁石を使用することも可能であるが、永久磁石は高価であり、かつ、アーク消弧のためには回路遮断時に磁界が存在すれば充分であることに鑑み、本発明においては主コイル９２を無励磁とする際に発生する逆起電力を使用してアーク消弧用の磁界を発生させる。
図２は、上述の原理を採用した本発明の実施形態であり、本実施形態による電磁継電器の概略構造図を示している。 In a magnetic arc extinguishing electromagnetic relay, it is possible to use a permanent magnet as a magnet, but the permanent magnet is expensive and it is sufficient for the arc to be extinguished if a magnetic field is present when the circuit is interrupted. In view of the above, in the present invention, a magnetic field for arc extinguishing is generated using a counter electromotive force generated when the main coil 92 is de-energized.
FIG. 2 is an embodiment of the present invention adopting the above-described principle, and shows a schematic structural diagram of an electromagnetic relay according to the present embodiment.

本実施形態では、図１の原理図に対してＵ字型の継鉄７１の一方の腕の上部にメイク接点Ｍの方向に向かって延びる延長継鉄４１と、この延長継鉄４１に巻回された消弧コイル４２が追加される。主コイル９２は励磁電源４３およびスイッチング素子４４の直列接続に接続される。この消弧コイル４２が、原理図で示された磁石９５の役割を担う。 In the present embodiment, an extended yoke 41 extending toward the make contact point M on the upper portion of one arm of the U-shaped yoke 71 as compared with the principle diagram of FIG. The arc-extinguishing coil 42 is added. The main coil 92 is connected to the exciting power supply 43 and the switching element 44 connected in series. The arc extinguishing coil 42 plays a role of the magnet 95 shown in the principle diagram.

また、消弧コイル４２は、スイッチング素子４４をオン状態として主コイル９２の励磁を開始したときに、消弧コイル４２に励磁電流が流れることを防止する逆流防止用ダイオード４５を介して、主コイル７２に並列接続される。 Further, the arc-extinguishing coil 42 is connected to the main coil via a backflow prevention diode 45 that prevents an exciting current from flowing through the arc-extinguishing coil 42 when the switching element 44 is turned on and excitation of the main coil 92 is started. 72 in parallel.

即ち、図２に示す実施形態においては、主コイル９２の巻き始め端９２１と消弧コイル４２の巻き始め端とは共通であり、主コイル９２の巻き終わり端９２２と消弧コイル４２の巻き終わり端４２２の間には、主コイル９２の巻き終わり端９２２にカソードが、消弧コイル４２の巻き終わり端４２２にアノードが接続される逆流防止用ダイオード４５が接続される。また、主コイル９２の巻き始め端９２１は励磁電源４３の正極に、巻き終わり端９２２はスイッチング素子４４を介して励磁電源４３の負極に接続される。 That is, in the embodiment shown in FIG. 2, the winding start end 921 of the main coil 92 and the winding start end of the arc-extinguishing coil 42 are common, and the winding end end 922 of the main coil 92 and the winding end of the arc-extinguishing coil 42 are common. Between the ends 422, a backflow prevention diode 45 is connected to which the cathode is connected to the winding end 922 of the main coil 92 and the anode is connected to the winding end 422 of the arc extinguishing coil 42. The winding start end 921 of the main coil 92 is connected to the positive electrode of the excitation power supply 43, and the winding end end 922 is connected to the negative electrode of the excitation power supply 43 via the switching element 44.

図３はスイッチング素子４４をオフとしたときの磁束の発生状況の説明図（その１）、図４はメイク接点の状態、閉磁路に発生する磁束Φ₁ 、延長継鉄４１に発生する磁束Φ₂ 、および励磁電流の時間的変化を示すグラフ（その１）である。 FIG. 3 is an explanatory diagram of the state of magnetic flux generation when the switching element 44 is turned off (Part 1). FIG. 4 is a state of a make contact, magnetic flux Φ ₁ generated in a closed magnetic circuit, and magnetic flux Φ generated in an extended yoke 41. ₂ and a graph (part 1) showing a temporal change in excitation current.

本実施例において、スイッチング素子４４をオンとすると、主コイル９２には励磁電流Ｉ_E が流れるが、励磁電流は逆流防止用ダイオード４５に阻止されるため消弧コイル４２には流れ込まない。従って、主コイル９２が励磁されると、Ｕ字型の継鉄９１の開口部が接極子９４で覆われて形成された閉磁路内を磁束Φ₁が発生するが、延長継鉄４１中には磁束は発生しない。 In this embodiment, when the switching element 44 is turned on, the exciting current _IE flows through the main coil 92, but the exciting current is blocked by the backflow preventing diode 45 and therefore does not flow into the arc extinguishing coil. Therefore, when the main coil 92 is excited, the magnetic flux Φ ₁ is generated in the closed magnetic path formed by covering the opening of the U-shaped yoke 91 with the armature 94. Does not generate magnetic flux.

スイッチング素子４４をオフとすると、主コイル９２によりＵ字型の継鉄９１と接極子９４で構成される閉磁路内の磁束Φ₁ は消滅するが、この際閉磁路内に逆起電力が発生し主コイルに励磁時とは逆向きの電流Ｉ_R が流れる。この逆向きの電流は逆流防止用ダイオード４５を順方向に流れて、消弧コイル４２中を流れる。従って、延長継鉄４１内および共通接点Ｃとメイク接点Ｍの間の空隙に磁束Φ₂ が発生して磁界が形成され、この磁界と共通接点Ｃとメイク接点Ｍの間に発生するアーク中を流れる電流との相互作用による力Ｆ₁ がアークに加わりアークが消弧される。 When the switching element 44 is turned off, the magnetic flux Φ ₁ in the closed magnetic path constituted by the U-shaped yoke 91 and the armature 94 is extinguished by the main coil 92, but at this time, a back electromotive force is generated in the closed magnetic circuit However, a current I _R flows in the opposite direction to that during excitation of the main coil. The reverse current flows in the arc extinguishing coil 42 through the backflow prevention diode 45 in the forward direction. Therefore, the magnetic flux Φ ₂ is generated in the extension yoke 41 and in the gap between the common contact C and the make contact M to form a magnetic field, and the arc generated between the magnetic field and the common contact C and the make contact M is generated. A force F ₁ due to the interaction with the flowing current is applied to the arc and the arc is extinguished.

図５は、本発明の他の実施形態による電磁継電器の概略構造図であって、図１および図２と同一の要素には同一の参照番号を使用する。
本発明の他の実施形態では、図１に示す原理図に対して、Ｕ字型の継鉄９１の一方の腕の上部にメイク接点Ｍの方向に向かって延びる延長継鉄４１と、この延長継鉄４１に巻回された消弧コイル４２の外に、Ｕ字型の継鉄９１の一方の腕に巻回される副コイル５１が追加される。そのため、図２および図３に示された本発明の実施形態による電磁継電器に用いられた逆流防止用ダイオード４５は不要となる。 FIG. 5 is a schematic structural diagram of an electromagnetic relay according to another embodiment of the present invention, and the same reference numerals are used for the same elements as those of FIGS.
In another embodiment of the present invention, with respect to the principle diagram shown in FIG. In addition to the arc-extinguishing coil 42 wound around the yoke 41, a secondary coil 51 wound around one arm of the U-shaped yoke 91 is added. Therefore, the backflow prevention diode 45 used in the electromagnetic relay according to the embodiment of the present invention shown in FIGS. 2 and 3 is not necessary.

主コイル９２の巻き始め端９２１と副コイル５１および消弧コイル４２の巻き終わり端とは共通に接続され、副コイル５１および消弧コイル４２の巻き始め端も共通に接続される。
そして、励磁電源４３とスイッチング素子４４の直列接続で構成される励磁回路が主コイル９２の巻き始め端９２１と巻き終わり端９２２との間に接続される。 The winding start end 921 of the main coil 92 and the winding end ends of the sub coil 51 and the arc extinguishing coil 42 are connected in common, and the winding start ends of the sub coil 51 and the arc extinguishing coil 42 are also connected in common.
An excitation circuit composed of a series connection of the excitation power supply 43 and the switching element 44 is connected between the winding start end 921 and the winding end end 922 of the main coil 92.

図６はスイッチング素子４４をオフとしたときの磁束の発生状況の説明図（その２）、図７はメイク接点の状態、閉磁路に発生する磁束Φ₁ 、副コイルを流れる電流、延長継鉄４１に発生する磁束Φ₂ 、および励磁電流の時間的変化を示すグラフである。 FIG. 6 is an explanatory diagram of the state of magnetic flux generation when the switching element 44 is turned off (Part 2). FIG. 7 is the state of the make contact, the magnetic flux Φ ₁ generated in the closed magnetic circuit, the current flowing through the subcoil, and the extended yoke 41 is a graph showing temporal changes in magnetic flux Φ ₂ generated in 41 and exciting current.

スイッチング素子４４をオンとすると、Ｕ字型の継鉄７１内に磁束Φ₁ が発生しメイク接点が閉となる。磁束Φ₁ が発生するとき副コイル５１に電流Ｉ_E が発生し、延長継鉄４１に磁束Φ₂ が発生するが、これは特段の作用を奏するものではない。 When the switching element 44 is turned on, a magnetic flux Φ ₁ is generated in the U-shaped yoke 71 and the make contact is closed. When the magnetic flux Φ ₁ is generated, the current _IE is generated in the subcoil 51 and the magnetic flux Φ ₂ is generated in the extension yoke 41, but this does not exhibit a special effect.

スイッチング素子４４をオフとすると、Ｕ字型の継鉄７１内の磁束Φ₁ は消滅するが、このときに発生する逆起電力により副コイル５１および消弧コイル５２に逆起電力電流Ｉ_R が流れる。すると、延長継鉄４１内および共通接点Ｃとメイク接点Ｍの間の空隙に磁束が発生して磁界Φ₂ が形成され、この磁界と共通接点Ｃとメイク接点Ｍの間に発生するアーク中を流れる電流との相互作用による力がアークに加わりアークが消弧される。 When the switching element 44 is turned off, although the magnetic flux [Phi ₁ in yoke 71 of U-shape disappears, the counter electromotive force current I _R to the auxiliary coil 51 and the arc-extinguishing coil 52 by counter electromotive force generated at this time Flowing. Then, a magnetic flux is generated in the extension yoke 41 and in the gap between the common contact C and the make contact M, and a magnetic field Φ ₂ is formed. A force due to the interaction with the flowing current is applied to the arc and the arc is extinguished.

本発明による磁気アーク消弧型電磁継電器の原理図である。1 is a principle diagram of a magnetic arc extinguishing electromagnetic relay according to the present invention. 本発明の実施形態による電磁継電器の概略構成図である。It is a schematic block diagram of the electromagnetic relay by embodiment of this invention. 磁束の発生状況の説明図（その１）である。It is explanatory drawing (the 1) of the generation | occurrence | production state of magnetic flux. メイク接点等の時間的変化を示すグラフ（その１）である。It is a graph (the 1) which shows temporal changes, such as a makeup contact. 本発明の他の実施形態による電磁継電器の概略構造図である。FIG. 3 is a schematic structural diagram of an electromagnetic relay according to another embodiment of the present invention. 磁束の発生状況の説明図（その２）である。It is explanatory drawing (the 2) of the generation | occurrence | production state of magnetic flux. メイク接点等の時間的変化を示すグラフ（その２）である。It is a graph (the 2) which shows temporal changes, such as a makeup contact.

Explanation of symbols

Ｃ共通接点
Ｍメイク接点
Ｂブレーク接点
４１延長継鉄
４２消弧コイル
４３励磁電源
４４スイッチング素子
４５逆流防止用ダイオード
５１副コイル
９１継鉄
９２主コイル
９２１巻き始め端
９２２巻き終わり端
９３可動バネ
９４接極子
９５磁石
１０８、１０９ブレーク接点支持部材
１１０、１１１ブレーク端子
１１２、１１３メイク接点支持部材
１１４、１１５メイク端子
４０３、４０４共通端子
４０５共通メイク基板
６０１、６０２、６０４絶縁材
６０３共通ブレーク基板 C Common contact M Make contact B Break contact 41 Extension yoke 42 Arc extinguishing coil 43 Excitation power supply 44 Switching element 45 Backflow prevention diode 51 Subcoil 91 Relay 92 Main coil 921 Winding start end 922 Winding end end 93 Movable spring 94 contact Pole 95 Magnet 108, 109 Break contact support member 110, 111 Break terminal 112, 113 Make contact support member 114, 115 Make terminal 403, 404 Common terminal 405 Common make substrate 601 602 604 Insulation material 603 Common break substrate

Claims

A first coil wound around an iron core;
An armature having a common contact that contacts the make contact when attracted to the iron core by supplying power to the first coil;
A second coil wound around an extension yoke extending in the direction of the make contact at the end of the iron core,
When power to the first coil is stopped, a counter electromotive force generated in the first coil is supplied to the second coil, and the second coil is connected to the common contact from the end of the extended yoke. An electromagnetic relay characterized by generating a magnetic flux toward the make contact.

An excitation power source is connected between a winding start end and a winding end end of the first coil via a switching element,
A winding start end of the second coil is connected to a winding start end of the first coil, and a winding end end of the second coil is connected to a winding end end of the first coil via a backflow prevention diode;
The said 2nd coil generate | occur | produces the said magnetic flux, when the said switching element is turned off from ON and supply of the electric power from the said excitation power supply to the said 1st coil is stopped. The electromagnetic relay described.

A third coil wound around the iron core;
The third coil generates an excitation current due to a counter electromotive force generated in the first coil when power to the first coil is stopped,
The electromagnetic relay according to claim 1, wherein the second coil generates the magnetic flux by supplying the excitation current.

An excitation power source is connected between a winding start end and a winding end end of the first coil via a switching element,
The winding end of the second coil and the winding end of the third coil are connected to the winding start of the first coil, and the winding start of the second coil and the winding start of the third coil are connected. The electromagnetic relay according to claim 3, wherein: