JPH0230191Y2 - - Google Patents
Info
- Publication number
- JPH0230191Y2 JPH0230191Y2 JP19640785U JP19640785U JPH0230191Y2 JP H0230191 Y2 JPH0230191 Y2 JP H0230191Y2 JP 19640785 U JP19640785 U JP 19640785U JP 19640785 U JP19640785 U JP 19640785U JP H0230191 Y2 JPH0230191 Y2 JP H0230191Y2
- Authority
- JP
- Japan
- Prior art keywords
- excitation
- current
- demagnetization
- parallel
- coil
- 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.)
- Expired
Links
- 230000005284 excitation Effects 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005347 demagnetization Effects 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- MWCLLHOVUTZFKS-UHFFFAOYSA-N Methyl cyanoacrylate Chemical compound COC(=O)C(=C)C#N MWCLLHOVUTZFKS-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Jigs For Machine Tools (AREA)
Description
【考案の詳細な説明】 本考案は電磁チヤツクに関する。[Detailed explanation of the idea] The present invention relates to an electromagnetic chuck.
例えば工作機械において工作物を固定するため
に、電磁チヤツクが使用される。これは励磁コイ
ルに直流通電して電磁石原理により磁性工作物を
吸着固定するものである。 Electromagnetic chucks are used, for example, to secure workpieces in machine tools. This uses direct current to an excitation coil to attract and fix a magnetic workpiece using the electromagnetic principle.
ここにおいて、電磁チヤツクの使用後に、残留
磁気を除去すべく、励磁コイルに交番電流を流す
ことが行われる。従来、これは直流電源を通電方
向切替手段を介して励磁手段に接続し、この切替
手段による切替えを行うと共に電流値を零まで低
減させることにより行つている。 Here, after using the electromagnetic chuck, an alternating current is passed through the excitation coil in order to remove residual magnetism. Conventionally, this has been accomplished by connecting the DC power supply to the excitation means via a current flow direction switching means, performing switching by the switching means, and reducing the current value to zero.
しかしながら、この消磁方法は作業がかなり煩
雑である上に長時間を要する。 However, this degaussing method is quite complicated and takes a long time.
一方、電磁石の消磁は交流通電によつても行い
得るという一般的知識が従来存在し、これにより
通電方向を切替える作業が不要になることは知ら
れている。 On the other hand, there is a general knowledge that demagnetization of an electromagnet can also be performed by alternating current energization, and it is known that this eliminates the need for switching the direction of energization.
しかしながら、電磁チヤツクの励磁コイルは非
常に大きなインダクタンスを有し、消磁に必要な
交流通電を行うには励磁用直流電源電圧に比べ遥
かに大きな電圧の交流電源を使用する必要があ
り、実際には交流通電による消磁は行われていな
い。 However, the excitation coil of the electromagnetic chuck has a very large inductance, and in order to carry out the AC current necessary for demagnetization, it is necessary to use an AC power source with a much higher voltage than the DC power supply voltage for excitation. Demagnetization by alternating current energization is not performed.
本考案は上述の点に鑑みてなされたもので、励
磁コイルを直流励磁し、消磁時は上記励磁コイル
にコンデンサを並列接続してまず交流通電し次い
で励磁コイルとコンデンサとの並列回路に減衰振
動性通電を行うような電磁チヤツクを構成したも
のである。 The present invention was developed in view of the above-mentioned points.The excitation coil is excited with DC current, and when demagnetizing, a capacitor is connected in parallel to the excitation coil and AC current is first applied.Then, the parallel circuit of the excitation coil and the capacitor is subjected to damped vibration. This is an electromagnetic chuck that conducts electrical current.
以下添付図面を参照して本考案の実施例を説明
する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
第1図は本考案の一実施例を示したもので、同
図においてW1〜Wnは電磁チヤツクの励磁コイ
ルを構成する単位コイルであり、相互に並列接続
されている。そして各単位コイルW1〜Wnの端
子は電磁接触器の常開接点CR1を介して整流器
Refの出力端子に接続され、この整流器の入力端
子は変圧器Tの2次巻線に接続されている。変圧
器Tの1次巻線は電磁接触器の常開接点CR1を
介して交流電源ACに接続されている。また各単
位コイルW1〜Wnの端子は電磁接触器の常閉接
点CR1を介してコンデンサCに接続され、この
コンデンサCはもう1つの電磁接触器の常開接点
CR2を介して交流電源ACに接続されている。 FIG. 1 shows an embodiment of the present invention. In the figure, W1 to Wn are unit coils constituting an excitation coil of an electromagnetic chuck, and are connected in parallel to each other. The terminals of each unit coil W1 to Wn are connected to the rectifier via the normally open contact CR1 of the magnetic contactor.
The input terminal of this rectifier is connected to the secondary winding of the transformer T. The primary winding of the transformer T is connected to an alternating current power supply AC via a normally open contact CR1 of a magnetic contactor. In addition, the terminals of each unit coil W1 to Wn are connected to a capacitor C via a normally closed contact CR1 of a magnetic contactor, and this capacitor C is a normally open contact of another magnetic contactor.
Connected to AC power supply via CR2.
この構成により励磁時、消磁時とも各単位コイ
ルを電源に対して並列接続し、励磁時は整流器
Refから通電し、消磁時は交流通電の後各単位コ
イルに並列に接続したコンデンサCを利用する共
振による減衰振動電流を流すようにしたものであ
る。 With this configuration, each unit coil is connected in parallel to the power supply during excitation and demagnetization, and a rectifier is connected during excitation.
Electricity is applied from Ref, and during demagnetization, after alternating current is applied, a damped oscillating current is passed through resonance using a capacitor C connected in parallel to each unit coil.
この回路において、電磁接触器CR1を閉じる
と、降圧トランスT、整流器Refを介して各単位
コイルW1〜Wnに直流通電が行われ、電磁チヤ
ツクは励磁される。 In this circuit, when the electromagnetic contactor CR1 is closed, direct current is applied to each unit coil W1 to Wn via the step-down transformer T and the rectifier Ref, and the electromagnetic chuck is excited.
次に電磁接触器CR2を閉じると、この接触器
接点CR2および電磁接触器常閉接点CR1を介し
てコンデンサCとチヤツクコイルW1ないしW4
との並列回路に、ある電圧による交番電流が通電
され、このときチヤツクへは直流励磁における磁
界に見合うだけの交番磁界が加わる。そしてこの
交番磁界によつて直流励磁による磁化が乱されて
消磁が行われ易くされる。 Next, when the magnetic contactor CR2 is closed, the capacitor C and the chuck coils W1 to W4 are connected via this contactor contact CR2 and the magnetic contactor normally closed contact CR1.
An alternating current with a certain voltage is applied to the parallel circuit with the chuck, and at this time an alternating magnetic field corresponding to the magnetic field in DC excitation is applied to the chuck. This alternating magnetic field disturbs the magnetization caused by DC excitation and facilitates demagnetization.
この交流通電を短時間行つた後に電磁接触器
CR2を開くと、コンデンサCとチヤツクコイル
W1ないしW4との並列回路に蓄えられた電気エ
ネルギは共振状態となつてコンデンサCとチヤツ
クコイルW1ないしW4との間で周波数すなわ
ち
=1/2π√
なる交流電源が流れかつ減衰する。 After this AC current is applied for a short time, the electromagnetic contactor
When CR2 is opened, the electrical energy stored in the parallel circuit of the capacitor C and the chuck coils W1 to W4 becomes resonant, and an AC power source with a frequency of =1/2π√ is generated between the capacitor C and the chuck coils W1 to W4. Flow and decay.
これは、交流電源ACにスライド式トランス
(図示せず)を挿入したとして、このスライド式
トランスのスライダを高出力電圧位置から最小出
力電圧位置まで動かした場合に相当し、この結果
消磁が行われる。 This corresponds to the case where a sliding transformer (not shown) is inserted into the AC power source and the slider of this sliding transformer is moved from the high output voltage position to the minimum output voltage position, resulting in demagnetization. .
これにより消磁が良好に行われる。 This ensures good demagnetization.
第2図はこの電磁接触器CR2の閉成による交
流通電から開放による振動電流通電に至る各コイ
ルの通電電流波形を示したものである。 FIG. 2 shows the waveform of the current flowing through each coil from alternating current energization when the electromagnetic contactor CR2 is closed to oscillating current energization when the electromagnetic contactor CR2 is opened.
すなわち、電磁接触器CR2の閉成ののち時点
TにおいてCR2を開放にすると直ちに減衰性振
動電流が流れ、消磁が行われる。 That is, when CR2 is opened at time T after closing the electromagnetic contactor CR2, a damping oscillating current flows immediately, and demagnetization is performed.
第3図および第4図は本考案の対象とする電磁
チヤツクの一例を示したもので、この図において
1は電磁チヤツクの本体を示し、2は底板を示す
本体1は角形の箱を伏せた形状をなし、底板2は
平板状をなし、本体1を下方から底板2で閉鎖す
る状態に組立てる。本体1は胴部3及び面板4と
よりなる。面板4は多数の平行な溝5にそれぞれ
磁極6aを挿入する。ただし、各磁極6aの厚さ
は各溝5の幅よりも薄くて、組立てた場合には第
4図のように各溝の内面との間に間隙を残しその
間隙内に非磁性材料の分極部7(セパレータ)を
形成する。分極部7の材料としては、非磁性金属
材料を用いてろう付けするか、あるいはエポキシ
樹脂、もしくはシアノアクリレート等の合成樹脂
接着剤により接着する。第4図に示すように磁極
6aの長さは各溝5の長さと同じであるが下方の
鉄心部6bの幅は本体1の胴部3の内のり(法)
の幅3cより所要長さ短かい。そのためこの鉄心
部6bに第2図上方に点線で示すように電磁線輪
8(第3図参照)を巻装した状態にて、鉄心部6
bが本体1内に収まり、磁極6aが溝5にはま
る。第3図は、このようにして鉄心部6bが本体
1内に収容され、組立てられた状態の断面図であ
る。 Figures 3 and 4 show an example of the electromagnetic chuck that is the object of the present invention. In these figures, 1 shows the main body of the electromagnetic chuck, and 2 shows the bottom plate. The main body 1 is a rectangular box turned upside down. The main body 1 is assembled in such a manner that the main body 1 is closed with the bottom plate 2 from below. The main body 1 consists of a body part 3 and a face plate 4. The face plate 4 has a large number of parallel grooves 5 into which magnetic poles 6a are inserted, respectively. However, the thickness of each magnetic pole 6a is thinner than the width of each groove 5, and when assembled, a gap is left between the inner surface of each groove and the non-magnetic material is polarized in the gap, as shown in FIG. Section 7 (separator) is formed. As the material for the polarized portion 7, a non-magnetic metal material may be used for brazing, or an epoxy resin or a synthetic resin adhesive such as cyanoacrylate may be used for adhesion. As shown in FIG. 4, the length of the magnetic pole 6a is the same as the length of each groove 5, but the width of the lower core portion 6b is the same as the inner width of the body portion 3 of the main body 1.
The required length is shorter than the width of 3c. Therefore, with the electromagnetic wire ring 8 (see FIG. 3) wound around the iron core 6b as shown by the dotted line in the upper part of FIG.
b fits into the main body 1, and the magnetic pole 6a fits into the groove 5. FIG. 3 is a cross-sectional view of the assembled state in which the iron core portion 6b is accommodated in the main body 1 in this manner.
この電磁チヤツクの各コイルに通電すると、各
磁極6aの露出作動面が例えば磁石のN極、面板
4の各磁極4aがS極に励磁される。なお磁極6
aの両端下部の面6dは本体1の溝5の溝底部5
aとは非磁性材料の分極部を介し接することは第
4図の分極部7と同様である。従つて鉄心部6b
の下底部の面が底板2と当接し、磁力線回路を作
るだけである。 When each coil of this electromagnetic chuck is energized, the exposed working surface of each magnetic pole 6a is excited to become, for example, the north pole of the magnet, and each magnetic pole 4a of the face plate 4 is excited to become the south pole. In addition, magnetic pole 6
The bottom surface 6d of both ends of a is the groove bottom 5 of the groove 5 of the main body 1.
It is similar to the polarized portion 7 in FIG. 4 that it is in contact with the polarized portion a through a polarized portion made of a non-magnetic material. Therefore, the iron core part 6b
The lower bottom surface of the is in contact with the bottom plate 2, and only a magnetic field line circuit is created.
そして、この電磁チヤツクは例えば、研削盤の
往復台上にその底板2を固定し、面板4の作動面
上に加工材料を磁力にて吸着させて保持し研削加
工に備える。 The electromagnetic chuck, for example, has its bottom plate 2 fixed on a reciprocating table of a grinding machine, and the workpiece is magnetically attracted and held on the working surface of the face plate 4 in preparation for grinding.
上記実施例はそれらを組合わせて変形すること
もできる。たとえば第1図の実施例において励磁
時に単位コイルを直列接続してもよい。また第1
図の実施例において、コンデンサを各単位コイル
毎に接続することもできる。 The above embodiments can also be modified by combining them. For example, in the embodiment shown in FIG. 1, unit coils may be connected in series during excitation. Also the first
In the illustrated embodiment, a capacitor can also be connected to each unit coil.
本考案は上述のように、電磁チヤツクの励磁コ
イルを直流励磁し、消磁時は上記励磁コイルを構
成する複数の単位コイルを利用して複数群に分割
され且つ並列接続された上記励磁コイルにコンデ
ンサを並列接続してまず交流通電を行い、次いで
励磁コイルとコンデンサとの並列回路に減衰振動
性通電を行うようにしたため、直流励磁による磁
化が交番磁界の印加によつて乱されて消磁され易
くなり滑らかに減磁が行われて良好に消磁動作が
行われる。 As described above, the present invention excites the excitation coil of an electromagnetic chuck with direct current, and when demagnetizing, uses a plurality of unit coils constituting the excitation coil to connect a capacitor to the excitation coil, which is divided into a plurality of groups and connected in parallel. are connected in parallel and first energized with alternating current, then damped oscillatory energization is applied to the parallel circuit of the excitation coil and capacitor, so the magnetization caused by direct current excitation is easily disturbed and demagnetized by the application of an alternating magnetic field. Demagnetization is performed smoothly and satisfactorily.
第1図は本考案の一実施例を示す回路図、第2
図は第1図の実施例における消磁電流波形図、第
3図は本考案の適用対象である電磁チヤツクの一
構造例を示す図、第4図は第3図のX−X線に沿
う断面図である。
W……励磁コイルの単位コイル、CR……電磁
接触器、Ref……整流器、1……本体、4……面
板、6a……磁極部、6b……鉄心部、8……コ
イル。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a degaussing current waveform diagram in the embodiment of Figure 1, Figure 3 is a diagram showing an example of the structure of an electromagnetic chuck to which the present invention is applied, and Figure 4 is a cross section taken along the line X-X in Figure 3. It is a diagram. W...unit coil of excitation coil, CR...magnetic contactor, Ref...rectifier, 1...main body, 4...face plate, 6a...magnetic pole part, 6b...iron core part, 8...coil.
Claims (1)
直流電流を供給する励磁電源と、 交流電源および励磁電流通電用のコンデンサか
らなる消磁電源と、 消磁時に前記交流電源を、少なくとも2つの群
に分割されて並列接続された前記複数の単位コイ
ルと前記コンデンサとの並列回路に接続して交流
通電した後に、前記交流電源を前記並列回路から
切り離して該並列回路に固有減衰振動による電流
を流す切替回路とをそなえた電磁チヤツク。[Claim for Utility Model Registration] An excitation coil consisting of a plurality of unit coils, an excitation power supply connected to these excitation coils and supplying DC current to the excitation coil, and a demagnetization system consisting of an AC power supply and a capacitor for supplying the excitation current. a power source; and, at the time of demagnetization, the AC power source is connected to a parallel circuit of the plurality of unit coils and the capacitors, which are divided into at least two groups and connected in parallel; An electromagnetic chuck equipped with a switching circuit that is separated from the main circuit and causes a current to flow due to the inherent damped oscillation in the parallel circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19640785U JPH0230191Y2 (en) | 1985-12-20 | 1985-12-20 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19640785U JPH0230191Y2 (en) | 1985-12-20 | 1985-12-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61127934U JPS61127934U (en) | 1986-08-11 |
JPH0230191Y2 true JPH0230191Y2 (en) | 1990-08-14 |
Family
ID=30754163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19640785U Expired JPH0230191Y2 (en) | 1985-12-20 | 1985-12-20 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0230191Y2 (en) |
-
1985
- 1985-12-20 JP JP19640785U patent/JPH0230191Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS61127934U (en) | 1986-08-11 |
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