JPH03149722A - electromagnetic contactor - Google Patents
electromagnetic contactorInfo
- Publication number
- JPH03149722A JPH03149722A JP28677689A JP28677689A JPH03149722A JP H03149722 A JPH03149722 A JP H03149722A JP 28677689 A JP28677689 A JP 28677689A JP 28677689 A JP28677689 A JP 28677689A JP H03149722 A JPH03149722 A JP H03149722A
- Authority
- JP
- Japan
- Prior art keywords
- contact
- coil
- movable
- iron core
- electromagnetic contactor
- 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
Links
- 230000005856 abnormality Effects 0.000 claims abstract description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims description 28
- 230000008021 deposition Effects 0.000 abstract 4
- 238000011084 recovery Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 12
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
Description
〔産業上の利用分野〕
本発明は、コイルが巻回された固定鉄心に吸引。
釈放される可動鉄心に連結された可動接触子支えに保持
された可動接触子とこの可動接触子が接離する固定接触
子とからなる主接点の溶着等の異常状態を検出する装置
に関する。
〔従来の技術〕
第７図は電磁接触器の概略構成図を示し、ｌは下部ケー
ス２に収納された固定鉄心、３は固定鉄心ｌに巻回され
たコイル、４は固定鉄心ｌに対向配置された可動鉄心、
５は可動鉄心４にビン６により連結され復帰スプリング
１１により押圧された可動接触子支え、７は可動接触子
支え５の窓孔５轟に接触スプリング８とともに保持され
た可動接触子、９は可動接触子７に対向配置され上部ケ
ース１０に固定された固定接触子であり、前記可動接触
子７および固定接触子９にはそれぞれ可動接点７＾およ
び固定接点９＾が取付けられている。電磁接触器の投入
指令によりコイル３に電圧が印加されると固定鉄心ｌに
可動鉄心４が吸引され、これにより可動接触子支え５が
下降して可動接触子７の可動接点７Ａが固定接触子９の
固定接点９＾に接触して投入される。電磁接触器の釈放
指令によりコイル３への電圧の印加が遮断されると可動
接触子支え５は復帰スプリング１１により押圧されて図
示の状態に戻り可動接点７轟が固定接点９＾よりｊＩＩ
間する。
この種の電磁接触器においては、可動接点７＾が固定接
点９轟より離間するときにアークが発生し、可動接点７
＾および固定接点９＾の表面が損耗して接触抵抗が大き
くなり、これらの接点間に過大電流が流れた際に両接点
が溶着することがある。また、投入時に接点バウンスを
伴うとアークが発生して−接点が溶着することがある。
従来このような主接点の溶着を検出する方法として、可
動接点と固定接点の損耗がこれら主接点の開閉により進
行することから主接点の開閉回数をカウントし、このカ
ウント値が所定値に達すると主接点を交換するようにし
たものや、電磁接触器自身が備えた補助接点を利用し、
電磁接触器に釈放指令が与えられたとき補助接点の出力
が切り換えられたかどうかを検知し、釈放指令が与えら
れたにもかかわらず補助接点が切り換わらなかったとき
に主接点が溶着したとして異常出力を発するものが知ら
れている。[Industrial Application Field] The present invention is directed to a fixed iron core around which a coil is wound. The present invention relates to a device for detecting an abnormal state such as welding of a main contact consisting of a movable contact held on a movable contact support connected to a movable iron core to be released, and a fixed contact that the movable contact approaches and separates from. [Prior Art] Fig. 7 shows a schematic configuration diagram of an electromagnetic contactor, where l is a fixed core housed in a lower case 2, 3 is a coil wound around the fixed core l, and 4 is a coil facing the fixed core l. movable iron core,
5 is a movable contact support connected to the movable iron core 4 by a pin 6 and pressed by a return spring 11; 7 is a movable contact held in the window hole 5 of the movable contact support 5 together with a contact spring 8; 9 is a movable contact This is a fixed contact placed opposite to the contact 7 and fixed to the upper case 10, and a movable contact 7^ and a fixed contact 9^ are attached to the movable contact 7 and the fixed contact 9, respectively. When a voltage is applied to the coil 3 by the closing command of the electromagnetic contactor, the movable core 4 is attracted to the fixed core 1, which causes the movable contact support 5 to lower and move the movable contact 7A of the movable contact 7 to the fixed contact. It contacts the fixed contact 9^ of 9 and is turned on. When the application of voltage to the coil 3 is interrupted by a release command of the electromagnetic contactor, the movable contact support 5 is pressed by the return spring 11 and returns to the state shown in the figure, and the movable contact 7 is moved from the fixed contact 9^ to
Pause. In this type of electromagnetic contactor, an arc is generated when the movable contact 7 is separated from the fixed contact 9, and the movable contact 7
The surfaces of the fixed contact 9^ and the fixed contact 9^ are worn out, resulting in increased contact resistance, and when an excessive current flows between these contacts, both contacts may become welded together. Furthermore, if the contact bounce occurs when the contact is turned on, an arc may occur and the - contact may be welded. Conventionally, a method for detecting welding of main contacts is to count the number of times the main contacts open and close, since wear and tear on the movable and fixed contacts progresses as these main contacts open and close, and when this count value reaches a predetermined value, By replacing the main contact or by using the auxiliary contact provided by the magnetic contactor itself,
It detects whether the output of the auxiliary contact is switched when a release command is given to the electromagnetic contactor, and when the auxiliary contact does not switch even though a release command is given, the main contact is welded and an error is detected. Those that emit output are known.
前述した従来装置のうち主接点の開閉回数をカウントす
るようにしたものでは、主接点の開閉回数により主接点
の損耗の程度は判断てきるものの実際に溶着が生じたか
どうかを検知することはできず、主接点の損耗によって
溶着が起きる可能性がありまだ使える状態ではあるが早
めに主接点を交換してしまうようにカウント値が設定さ
れるという欠点を有する。また、電磁接触器の補助接点
を利用したものでは、電磁接触器に釈放指令が与えられ
てから補助接点が切り換えられるまでの応答時間が一定
てはなくばらつきがあることから、電磁接触器に釈放指
令が与えられてから所定時間後に補助接点の出力が切り
換えられたかどうかを検知するようにせねばならず、釈
放指令が与えられてから所定時間後に補助接点の出力の
状態を検知するためにタイマ回路が必要であるとともに
主接点の溶着が一生じた際に上位にブレーカを遮断させ
るようなシーケンスを組む場合にはシーケンスが複雑に
なるという欠点を有する。
そこで本発明の目的は前述した従来装置の欠点を除去し
、構成が簡単で主接点の溶着を確実に検出することがで
きる装置を備えた電磁接触器を優供することにある。
（課題を解決するための手段）
本発明は前述した目的を達成するために、コイルが巻回
された固定鉄心、この固定鉄心に対向配置された可動鉄
心からなる電磁石装置と、この電磁石装置の可動鉄心に
連結された可動接触子支えに接触スプリングとともに支
持された可動接触子と、この可動接触子に対向配置され
た固定接触子とを備えた電磁接触器において、前記コイ
ルに並列にコンデンサと抵抗とを有し、前記可動鉄心の
釈放時のコイルのインダクタンスの変化を検出して接点
の異常を検出する接点異常検出手段を設けたことを特徴
とする特
ｖた、本発明によれば前記接点異常検出手段は電磁接触
器に着脱自在に取付けられることを特徴とする特
＊作 用〕
電磁接触器の電磁石装置を構成するコイルのインダクタ
ンスは釈放指令によって可動鉄心が固定鉄心から離れる
とき前記可動鉄心の位置により変化し、釈放指令により
可動鉄心が復帰位置まで正常に戻った場合のコイルのイ
ンダクタンスの変化と、釈放指令が与えられたにもかか
わらず主接点の溶着により可動鉄心が復帰位置に戻るこ
とができずに停止した。場合のコイルのインダクタンス
の変化とには差が生じ、このコイルのインダクタンスの
変化をコイルに並列に接続されたコンデンサと抵抗から
なる接点異常検出手段により検出して接点の溶着を検知
する。
（実施例）
以下、本発明の一実施例を図面に基づいて詳細に説明す
る。
第１図は本発明の一実施例を示す電磁接触器の接点異常
検出装置のブロック図である。
図において、２１は電磁接触器のコイルを示し、このコ
イル２１はスイッチ２４と直列に接続されて電源２５に
接続されている。２２は接点異常検出ユニットを示し、
前記コイル２１に並列にコンデンサ２２ａと抵抗２２ｂ
の直列回路が接続され、抵抗２２ｂの両端に演算回路２
２ｃが接続されている、 ２３ａ、２３ｂは接点異常検
出ユニット２２の検出出力端子である。
スイッチ２４が投入されてコイル２１に電源電圧が印加
されると不図示の可動鉄心が固定鉄心に吸引されること
により可動接点が固定接点に接触する。
電磁接触器の釈放指令によりスイッチ２４が開放される
とコイル２１には逆起電力が発生し、このコイル２１の
エネルギーによってコンデンサ２２ａ と抵抗２２ｂと
コイル２１の閉回路に電流が流れ、コンデンサ２２ａが
充電される。このコンデンサ２２ａの放電によって前記
とは逆方向に電流が流れ、これを繰り返して振動しなが
ら抵抗２２ｂによってコイル２１のエネルギーは減衰さ
れていく、ここで、スイッチ２４の開放時にコイル２１
に発生する逆起電力の大きさは可動鉄心の位置によって
コイル２１のインダクタンスの値が異なり、スイッチ２
４の開放によって可動鉄心が正常に復帰した場合と、可
動接点と固定接点からなる主接点の溶着により可動鉄心
が復帰することなく中途半端な位置で停止した場合とで
はコイル２１のインダクタンスが相違する。そこでこの
実施例では前述のようにコイル２１のインダクタンスの
変化を抵抗２１ｂに発生する電流又は電圧を測定するこ
とにより検出するように構成したものである。
前記釈放時におけるコイル２１のインダクタンスの変化
を抵抗２２ｂに流れる振動電流で測定した結果の波形を
第２図および第３図に示す。
第２図は可動鉄心が正常に復帰した釈放時の電流波形を
示し、八区間がスイッチ２４の開放により可動鉄心が吸
着状態から釈放動作している状態のとき、Ｂ区間が可動
鉄心が完全に開いて復帰した状態のときであり、可動鉄
心の吸着状態ではコイル２１のインダクタンスの値が大
きく振動周波数が低いが、可動鉄心が釈放されるとコイ
ル２１のインダクタンスの値が小さくなり振動周波数が
高くなるように振動周波数が変化する。
第３図は可動接点と固定接点が溶着して可動鉄心が復帰
することができない異常時の振動電流波形を示し、この
場合にはスイッチ２４開放時の振動電流波形は第２図の
場合と同一であるが、可動鉄心が復帰することなく中途
半端な位置に停止することによりコイル２１のインダク
タンスの値は比較的大きいので振動周波数は低く振動周
波数はそれほど変化しない、因みにこの実施例の一例を
示せば、第２図の振動電流波形が０点を通過する時点を
１．ｔ２間の時間Δｉは１．０５ミリセカンド、第３図
の時点１３． ｔ４間の時間ΔＴは３．９５ミリセカン
ドである。
第１図に戻り、演算回路２２ｃではスイッチ２４の開放
により抵抗２２ｂに発生する電流の変化を検出してスイ
ッチ２４の開放を検知し、そしてスイッチ２４の開放を
検知してから所定時間後（すなわち第２図のＢ区間）に
振動電流がＯ点を遥遇する０点間の時間を測定し、この
測定値を基準値２比較することにより主接点の溶着異常
の有無を判定して検出出力端子２３ａ、２３ｂから外部
、例えば上位のブレーカのトリップコイルに検出出力を
発する。
なお、前記実施例において演算回路２２ｃは振動電流が
０点を遍遇する０点間の時間により主接点の溶着異常を
検知することについて述べたが、振動周波数の測定、振
動電流又は振動電圧がＯ点を遥遇する数をカウントする
などによって溶着異常を検知することもできる。
次に第１図に示した接点異常検出ユニットの電磁接触器
への取付けについて第４図ないし第６図を用いて説明す
る。
第４図において、３１は電［接触器を示し、電磁接触器
の側面には不図示のコイルのコイル端子３２が設けられ
、電磁接触器３１の底面側には保合口部３４が設けられ
ている。３３は可動接触子支えである。
接点異常検出ユニット２２０回路部はユニット枠体２２
＾内に収納され、ユニット枠体２２Ａにはコイル端子３
２に接続される接続片２２Ｂと検出出力端子２３ａ。
２３ｂおよび電源端子２２ｄの端子ねじ２２Ｃが設けら
れている。電磁接触器３１の係合凹部３４の両壁には第
５図に示すように保合突起３４ｍ、３４ｂが設けられ、
ユニット枠体２２＾の端子ねじ２２Ｃとは反対側の面に
は第６図に示すように結合片２２０．２２１１が設けら
れ、この結合片２２０．２２１１は係合凹部３４の係合
突起３４ａ、３４ｂに係合するようにされている。なお
、ユニット枠体２２＾の接続片２２Ｂに沿って設けられ
た絶縁板２２Ｆは接続片２２Ｂの充電部を力バーするも
のである。
前記ユニット枠体２２轟の電磁接触器３１への取付けは
、電磁接触器３１の係合凹部３４の下面側開口端よりユ
ニット枠体２２轟の結合片２２Ｂ、２２１！を嵌め込む
ことにより結合片２２０．２２Ｂは係合凹部３４の係合
突起３４ａ、３４ｂに引っ掛かって抜は止めとなる。ユ
ニツト枠体２２＾の下面方向の抜は止めは電磁接触Ｂ３
１の底面側が取付面となることにより行われる。
第４図ないし第６図に示す実施例では接点異常検出ユニ
ット２２を電磁接触器のコイル端子３２の下部にワンタ
ッチで取付けられることにより、コイル端子３２と接点
異常検出ユニット２２との間の配線が不要となるもので
ある。しかしながら、接点異常検出ユニット２２をコイ
ル端子３２の下部に他のユニットを装着しなければなら
ない等の理由によりコイル端子３２の下部への装着がで
きない場合には、本出願人により出願された実願平１−
８１０８３号に記載されたように、第４図に示す電磁接
触器の頭部に補助接点ユニットの取付けと同様な手段に
よりワンタッチで装着することおよび本出願人により出
願された特願平１−１１６８０８号に記載されたように
、電磁接触器の側面にワンタッチで装着することもでき
る。
（発明の効果〕
以上に説明したように本発明によれば、コイルが巻回さ
れた固定鉄心、この固定鉄心に対向配置された可動鉄心
からなる電磁石装置と、この電磁石装置の可動鉄心に連
結された可動接触子支えに接触スプリングとともに支持
された可動接触子と、この可動接触子に対向配置された
固定接触子とを備えた電磁接触器において、前記コイル
に並列にコンデンサと抵抗とを有し、前記可動鉄心の釈
放時のコイルのインダクタンスの変化を検出して接点の
異常を検出する接点異常検出手段を設けたことにより、
主接点の溶着をコイルのインダクタンス変化により確実
に検出することができるので信頼性が向上し、またコイ
ルと並列にコンデンサと抵抗が挿入されていることによ
り接点異常検出手段はコイルへのサージ電圧を吸収する
ＩＩｔをも果たすという効果を有する。さらに、接点異
常検出手段を電磁接触器に着脱自在とすることにより電
磁接触器自体の外形寸法を変更する−ことなく接点異常
検出機能を備えた電磁接触器を提供することができる。Among the conventional devices mentioned above, those that count the number of times the main contact opens and closes can determine the degree of wear and tear on the main contact based on the number of times the main contact opens and closes, but cannot detect whether or not welding has actually occurred. First, there is a drawback that welding may occur due to wear and tear on the main contacts, and the count value is set so that the main contacts may be replaced sooner even though they are still usable. In addition, when using an auxiliary contact of a magnetic contactor, the response time from when a release command is given to the magnetic contactor until the auxiliary contact is switched is not constant and varies; It is necessary to detect whether the output of the auxiliary contact is switched after a predetermined time after the command is given, and a timer circuit is required to detect the state of the output of the auxiliary contact after a predetermined time after the release command is given. In addition, it has the disadvantage that the sequence becomes complicated when a sequence is set up to shut off the breaker at the upper level when the main contacts are welded. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the drawbacks of the conventional devices described above, and to provide an electromagnetic contactor that is simple in construction and equipped with a device that can reliably detect welding of the main contacts. (Means for Solving the Problems) In order to achieve the above-mentioned objects, the present invention provides an electromagnet device comprising a fixed iron core around which a coil is wound, a movable iron core arranged opposite to the fixed iron core, and an electromagnet device of the electromagnet device. In an electromagnetic contactor comprising a movable contact supported together with a contact spring on a movable contact support connected to a movable iron core, and a fixed contact disposed opposite to the movable contact, a capacitor is connected in parallel to the coil. According to the present invention, the present invention is characterized in that a contact abnormality detection means is provided, which has a resistor and detects a change in the inductance of the coil when the movable iron core is released to detect an abnormality in the contact. A special feature characterized in that the contact abnormality detection means is detachably attached to the electromagnetic contactor] The inductance of the coil constituting the electromagnetic device of the electromagnetic contactor is such that when the movable core is separated from the fixed core by a release command, the movable core is separated from the fixed core by a release command. Changes in coil inductance when the movable core returns normally to the return position due to a release command, and changes in coil inductance when the movable core returns to the return position due to a release command, and changes in coil inductance when the movable core returns to the return position due to welding of the main contact despite the release command being given. I couldn't go back and stopped. There is a difference between the change in the inductance of the coil and the change in the inductance of the coil, and this change in the inductance of the coil is detected by contact abnormality detection means consisting of a capacitor and a resistor connected in parallel to the coil to detect welding of the contact. (Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a block diagram of a contact abnormality detection device for an electromagnetic contactor showing an embodiment of the present invention. In the figure, 21 indicates a coil of an electromagnetic contactor, and this coil 21 is connected in series with a switch 24 and connected to a power source 25. 22 indicates a contact abnormality detection unit;
A capacitor 22a and a resistor 22b are connected in parallel to the coil 21.
A series circuit is connected to the resistor 22b, and an arithmetic circuit 2 is connected to both ends of the resistor 22b.
2c is connected, and 23a and 23b are detection output terminals of the contact abnormality detection unit 22. When the switch 24 is turned on and a power supply voltage is applied to the coil 21, the movable iron core (not shown) is attracted to the fixed iron core, so that the movable contact contacts the fixed contact. When the switch 24 is opened by the release command of the electromagnetic contactor, a back electromotive force is generated in the coil 21, and the energy of the coil 21 causes a current to flow through the closed circuit of the capacitor 22a, the resistor 22b, and the coil 21, and the capacitor 22a is It will be charged. Due to the discharge of the capacitor 22a, a current flows in the opposite direction to that described above, and the energy of the coil 21 is attenuated by the resistor 22b while repeating this and vibrating.Here, when the switch 24 is opened, the coil 21
The magnitude of the back electromotive force generated in the switch 2 differs depending on the position of the movable iron core, and the value of the inductance of the coil 21
The inductance of the coil 21 is different between the case where the movable core returns to normal by opening 4 and the case where the movable core does not return and stops at a halfway position due to welding of the main contact consisting of the movable contact and the fixed contact. . Therefore, in this embodiment, as described above, a change in the inductance of the coil 21 is detected by measuring the current or voltage generated in the resistor 21b. FIGS. 2 and 3 show the waveforms of the results of measuring the change in inductance of the coil 21 at the time of release using the oscillating current flowing through the resistor 22b. Figure 2 shows the current waveform when the movable core returns to normal and is released.When the 8th section is the state in which the movable core is released from the adsorption state by opening the switch 24, the B section is when the movable core is completely released. This is when the movable core is in the open and restored state, and when the movable core is attracted, the inductance value of the coil 21 is large and the vibration frequency is low, but when the movable core is released, the inductance value of the coil 21 is small and the vibration frequency is high. The vibration frequency changes as follows. Figure 3 shows the oscillating current waveform in an abnormal situation where the movable contact and fixed contact are welded together and the movable iron core cannot be returned to its original position. In this case, the oscillating current waveform when the switch 24 is open is the same as in Figure 2. However, since the movable core does not return and stops at a halfway position, the inductance value of the coil 21 is relatively large, so the vibration frequency is low and the vibration frequency does not change much. For example, the time point at which the oscillating current waveform in FIG. 2 passes through the 0 point is defined as 1. The time Δi between t2 is 1.05 milliseconds, at time 13 in FIG. The time ΔT between t4 is 3.95 milliseconds. Returning to FIG. 1, the arithmetic circuit 22c detects the change in the current generated in the resistor 22b due to the opening of the switch 24, detects the opening of the switch 24, and after a predetermined period of time after detecting the opening of the switch 24 (i.e. Measure the time between 0 points when the oscillating current reaches the O point in section B in Figure 2), and compare this measured value with the reference value 2 to determine whether there is a welding abnormality in the main contact and output the detection output. A detection output is output from the terminals 23a and 23b to an external device, for example, a trip coil of a higher-order breaker. In the above embodiment, it has been described that the arithmetic circuit 22c detects the welding abnormality of the main contact based on the time between zero points when the oscillating current is 0, but it is also possible to Welding abnormalities can also be detected by counting the number of times when the O point is reached. Next, the attachment of the contact abnormality detection unit shown in FIG. 1 to the electromagnetic contactor will be explained using FIGS. 4 to 6. In FIG. 4, 31 indicates an electric contactor, a coil terminal 32 of a coil (not shown) is provided on the side surface of the electromagnetic contactor, and a retaining opening 34 is provided on the bottom side of the electromagnetic contactor 31. There is. 33 is a movable contact support. The circuit part of the contact abnormality detection unit 220 is mounted on the unit frame 22
The coil terminal 3 is stored in the unit frame 22A.
2 and the detection output terminal 23a. 23b and a terminal screw 22C of the power terminal 22d are provided. As shown in FIG. 5, locking protrusions 34m and 34b are provided on both walls of the engaging recess 34 of the electromagnetic contactor 31.
As shown in FIG. 6, coupling pieces 220.2211 are provided on the surface of the unit frame 22^ opposite to the terminal screw 22C, and the coupling pieces 220.2211 are connected to the engagement protrusion 34a of the engagement recess 34, 34b. Note that the insulating plate 22F provided along the connecting piece 22B of the unit frame 22^ serves as a force bar for the live part of the connecting piece 22B. The unit frame 22 is attached to the electromagnetic contactor 31 from the lower open end of the engagement recess 34 of the electromagnetic contactor 31 to the coupling pieces 22B, 221! of the unit frame 22. By fitting the coupling pieces 220.22B into the engagement protrusions 34a and 34b of the engagement recess 34, the coupling pieces 220.22B are prevented from being removed. The magnetic contact B3 prevents the unit frame 22^ from being pulled out in the lower direction.
This is done by using the bottom side of 1 as the mounting surface. In the embodiment shown in FIGS. 4 to 6, the contact abnormality detection unit 22 can be attached to the lower part of the coil terminal 32 of the electromagnetic contactor with one touch, so that the wiring between the coil terminal 32 and the contact abnormality detection unit 22 can be easily connected. It becomes unnecessary. However, if the contact abnormality detection unit 22 cannot be attached to the lower part of the coil terminal 32 due to reasons such as having to attach another unit to the lower part of the coil terminal 32, the practical application filed by the present applicant Hei 1-
As described in No. 81083, the auxiliary contact unit can be attached to the head of the electromagnetic contactor shown in FIG. As described in the issue, it can also be attached to the side of the electromagnetic contactor with one touch. (Effects of the Invention) As explained above, according to the present invention, there is provided an electromagnet device including a fixed core around which a coil is wound, a movable core arranged opposite to the fixed core, and a movable core connected to the electromagnet device. In the electromagnetic contactor, the electromagnetic contactor includes a movable contact supported together with a contact spring on a movable contact support, and a fixed contact disposed opposite to the movable contact, which includes a capacitor and a resistor in parallel with the coil. By providing contact abnormality detection means for detecting a change in the inductance of the coil when the movable iron core is released, and detecting an abnormality in the contact,
Reliability is improved because main contact welding can be reliably detected by changes in coil inductance, and since a capacitor and resistor are inserted in parallel with the coil, the contact abnormality detection means detects surge voltage to the coil. It has the effect of also fulfilling the function of absorbing IIt. Furthermore, by making the contact abnormality detection means detachable from the electromagnetic contactor, it is possible to provide an electromagnetic contactor having a contact abnormality detection function without changing the external dimensions of the electromagnetic contactor itself.
第１図は本発明の一実施例を示す電磁接触器の接点異常
検出装置のブロック図、第２図および第３図はそれぞれ
接点異常検出ユニットの腰部波形図、第４図ないし第６
図は電磁接触器に接点異常検出ユニットを取付けるため
の一実施例を示し、第４図Ｌｔ ｔ ＠接触器と接点異
常検出ユニットの斜視図、第５図は電磁接触器の保合口
部の拡大図、第６図は接点異常検出ユニットの背面側よ
りみた斜視図、第７図は電磁接触器の概略構成図である
。
２１： コイル、２２：接点異常検出ユニット、２２ａ
＝コンデンサ、２２ｂ＝抵抗、２２ｃ：演算回路、２４
： ス″イッ／ 芦
１ ｌ腎゜七−−２Ｌｚ３ｂ
１ハ ΔＴ＝ＬＯ５ｃ
１ハ 。
５禦φ５ｖ
第 ３１ＩＵ
２ Ｂ
拳 ５ 図 第 ６ｍFIG. 1 is a block diagram of a contact abnormality detection device for an electromagnetic contactor showing an embodiment of the present invention, FIGS. 2 and 3 are waist waveform diagrams of the contact abnormality detection unit, and FIGS. 4 to 6 respectively.
The figure shows an example of attaching a contact abnormality detection unit to an electromagnetic contactor, Fig. 4 is a perspective view of the contactor and contact abnormality detection unit, and Fig. 5 is an enlarged view of the retaining opening of the electromagnetic contactor. 6 is a perspective view of the contact abnormality detection unit as seen from the back side, and FIG. 7 is a schematic configuration diagram of the electromagnetic contactor. 21: Coil, 22: Contact abnormality detection unit, 22a
= Capacitor, 22b = Resistor, 22c: Arithmetic circuit, 24
: Sweep / Ashi 1 l Kidney゜7--2Lz3b 1ha ΔT=LO5c 1ha.5 禦φ5v 31st IU 2 B Fist 5 Figure 6m
Claims (1)
配置された可動鉄心からなる電磁石装置と、この電磁石
装置の可動鉄心に連結された可動接触子支えに接触スプ
リングとともに支持された可動接触子と、この可動接触
子に対向配置された固定接触子とを備えた電磁接触器に
おいて、前記コイルに並列にコンデンサと抵抗とを有し
、前記可動鉄心の釈放時のコイルのインダクタンスの変
化を検出して接点の異常を検出する接点異常検出手段を
設けたことを特徴とする電磁接触器。 ２）コイルが巻回された固定鉄心、この固定鉄心に対向
配置された可動鉄心からなる電磁石装置とこの電磁石装
置の可動鉄心に連結された可動接触子支えに接触スプリ
ングとともに支持された可動接触子と、この可動接触子
に対向配置された固定接触子とを備えた電磁接触器にお
いて、前記コイルに並列にコンデンサと抵抗とを有し、
前記可動鉄心の釈放時のコイルのインダクタンスの変化
を検出して接点の異常を検出する接点異常検出手段を設
け、この接点異常検出手段を電磁接触器に着脱自在に取
付けることを特徴とする電磁接触器。[Scope of Claims] 1) An electromagnet device consisting of a fixed iron core around which a coil is wound, a movable iron core arranged opposite to the fixed iron core, and a contact spring attached to a movable contact support connected to the movable iron core of the electromagnet device. In an electromagnetic contactor equipped with a movable contactor supported together with a fixed contactor disposed opposite to the movable contactor, the electromagnetic contactor has a capacitor and a resistor in parallel with the coil, and when the movable iron core is released, An electromagnetic contactor characterized by being provided with a contact abnormality detection means for detecting a contact abnormality by detecting a change in the inductance of a coil. 2) An electromagnet device consisting of a fixed core around which a coil is wound, a movable core placed opposite to the fixed core, and a movable contact supported together with a contact spring by a movable contact support connected to the movable core of the electromagnet device. and a fixed contact disposed opposite to the movable contact, the electromagnetic contactor having a capacitor and a resistor in parallel with the coil,
An electromagnetic contact characterized in that a contact abnormality detection means is provided for detecting a contact abnormality by detecting a change in the inductance of the coil when the movable iron core is released, and the contact abnormality detection means is detachably attached to an electromagnetic contactor. vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1286776A JP2600928B2 (en) | 1989-11-02 | 1989-11-02 | Electromagnetic contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1286776A JP2600928B2 (en) | 1989-11-02 | 1989-11-02 | Electromagnetic contactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03149722A true JPH03149722A (en) | 1991-06-26 |
| JP2600928B2 JP2600928B2 (en) | 1997-04-16 |
Family
ID=17708903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1286776A Expired - Fee Related JP2600928B2 (en) | 1989-11-02 | 1989-11-02 | Electromagnetic contactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2600928B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008525947A (en) * | 2004-12-23 | 2008-07-17 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for operating switchgear safely |
| WO2012128038A1 (en) * | 2011-03-22 | 2012-09-27 | パナソニック株式会社 | Electromagnetic opening/closing device |
| JP2013008623A (en) * | 2011-06-27 | 2013-01-10 | Panasonic Corp | Contactor and electromagnetic switch |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5370553B1 (en) * | 2012-08-31 | 2013-12-18 | オムロン株式会社 | Electromagnetic relay welding detection device and electromagnetic relay welding detection method |
| JP6231949B2 (en) | 2014-06-23 | 2017-11-15 | 株式会社日立建機ティエラ | Hydraulic drive unit for construction machinery |
-
1989
- 1989-11-02 JP JP1286776A patent/JP2600928B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008525947A (en) * | 2004-12-23 | 2008-07-17 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for operating switchgear safely |
| JP4673378B2 (en) * | 2004-12-23 | 2011-04-20 | シーメンス アクチエンゲゼルシヤフト | Switch operating method and switchgear |
| US7978036B2 (en) | 2004-12-23 | 2011-07-12 | Siemens Aktiengesellschaft | Method and device for the secure operation of a switching device |
| WO2012128038A1 (en) * | 2011-03-22 | 2012-09-27 | パナソニック株式会社 | Electromagnetic opening/closing device |
| JP2012199115A (en) * | 2011-03-22 | 2012-10-18 | Panasonic Corp | Electromagnetic switch |
| US9159512B2 (en) | 2011-03-22 | 2015-10-13 | Panasonic Intellectual Property Management Co., Ltd. | Electromagnetic opening/closing device |
| JP2013008623A (en) * | 2011-06-27 | 2013-01-10 | Panasonic Corp | Contactor and electromagnetic switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2600928B2 (en) | 1997-04-16 |
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