JPH0439211B2 - - Google Patents
Info
- Publication number
- JPH0439211B2 JPH0439211B2 JP61061999A JP6199986A JPH0439211B2 JP H0439211 B2 JPH0439211 B2 JP H0439211B2 JP 61061999 A JP61061999 A JP 61061999A JP 6199986 A JP6199986 A JP 6199986A JP H0439211 B2 JPH0439211 B2 JP H0439211B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- eddy current
- axis
- coil
- demagnetizing 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 - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、例えば船体等の金属体に発生する渦
電流磁界を打消す渦電流磁界消去装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an eddy current magnetic field canceling device that cancels eddy current magnetic fields generated in a metal body such as a ship's body.
（発明の背景）
一般に、船舶が航行する場合、船体から発する
磁気を零としたい場合がある。船体は多くの場合
鋼材が使用されており、これら鋼材を含む船体の
磁性体より発する磁気（磁性体の磁化に起因する
もの）については、従来より消磁が行なわれてい
た。(Background of the Invention) Generally, when a ship is sailing, there are cases where it is desired to reduce the magnetism emitted from the ship's hull to zero. Steel is often used for ship hulls, and the magnetism (resulting from the magnetization of magnetic materials) generated by magnetic materials in ship hulls including these steel materials has traditionally been demagnetized.
しかし、船体は動揺したときに地磁気等の外部
磁界を横切り、このため船体を構成する鋼材等の
磁性金属体及びアルミニウム、ステンレス等の非
磁性金属体に渦電流が流れ、この渦電流に起因す
る渦電流磁界が発生する。厳密に、船体から発す
る磁気を零とするためには、この渦電流磁界も消
去する必要がある。 However, when the ship's hull is shaken, it crosses external magnetic fields such as the earth's magnetism, and as a result, eddy currents flow through magnetic metals such as steel and non-magnetic metals such as aluminum and stainless steel that make up the ship's hull. An eddy current magnetic field is generated. Strictly speaking, in order to reduce the magnetism emitted from the hull to zero, it is also necessary to eliminate this eddy current magnetic field.
（問題点を解決するための手段及び作用）
本発明は、上記の点に鑑み、磁性金属体や非磁
性金属体に発生する渦電流磁界を消去し得る渦電
流磁界消去装置を提供しようとするものである。(Means and effects for solving the problems) In view of the above points, the present invention seeks to provide an eddy current magnetic field erasing device capable of erasing eddy current magnetic fields generated in magnetic metal bodies and non-magnetic metal bodies. It is something.
本発明は、外部磁界が変化して金属に発生する
渦電流による磁界と、ピツクアツプコイルに誘起
する電圧が同位相であることに着目し、ピツクア
ツプコイルに誘起する電圧を増幅し、この検出出
力に応じた電流を消磁コイルに流し、渦電流磁界
を打消すようにしている。 The present invention focuses on the fact that the magnetic field caused by the eddy current generated in the metal due to a change in the external magnetic field and the voltage induced in the pickup coil are in the same phase.The present invention amplifies the voltage induced in the pickup coil and uses this detection output as A corresponding current is passed through the degaussing coil to cancel out the eddy current magnetic field.
すなわち、本発明の渦電流磁界消去装置は、金
属体の近傍に互いに直交して設置され、地磁気等
の外部磁界の変化を検出する３個のピツクアツプ
コイルと、同じく前記金属体の近傍に設けられ、
前記金属体に生じる渦電流磁界を打消す磁界を発
生するＸ軸消磁コイル、Ｙ軸消磁コイル及びＺ軸
消磁コイルと、前記各ピツクアツプコイルの検出
出力をそれぞれ増幅する増幅手段と、増幅された
各信号成分に基づき、それぞれ渦電流磁界を打消
すための信号を出力し、前記Ｘ軸消磁コイル、Ｙ
軸消磁コイル及びＺ軸消磁コイルに与える打消信
号出力手段とを具備している。 That is, the eddy current magnetic field erasing device of the present invention includes three pickup coils that are installed near a metal body so as to be orthogonal to each other and detect changes in an external magnetic field such as earth's magnetism, and three pickup coils that are also installed near the metal body. ,
an X-axis degaussing coil, a Y-axis degaussing coil, and a Z-axis degaussing coil that generate a magnetic field that cancels the eddy current magnetic field generated in the metal body; amplifying means that amplifies the detection output of each of the pickup coils; Based on the signal components, signals for canceling the eddy current magnetic field are output, respectively, and the X-axis demagnetizing coil and the Y-axis demagnetizing coil
It is equipped with canceling signal output means to be applied to the axial demagnetizing coil and the Z-axis demagnetizing coil.
（実施例）
以下、本発明に係る渦電流磁界消去装置の実施
例を図面に従つて説明する。(Example) Hereinafter, an example of the eddy current magnetic field erasing device according to the present invention will be described with reference to the drawings.
第１図、第２図は本発明の１実施例を示し、第
１図は磁性及び非磁性の金属で構成される船体を
模式的に示した斜視図、第２図は回路ブロツク図
である。 Figures 1 and 2 show one embodiment of the present invention, with Figure 1 being a perspective view schematically showing a hull made of magnetic and non-magnetic metals, and Figure 2 being a circuit block diagram. .
船体１には、それぞれ互いに直交する方向に、
Ｘ軸用のピツクアツプコイル２Ｘ、Ｙ軸用のピツ
クアツプコイル２Ｙ及びＺ軸用のピツクアツプコ
イル２Ｚが巻回されている。また、各ピツクアツ
プコイル２Ｘ，２Ｙ，２Ｚの近傍に、Ｘ軸用の消
磁コイル３Ｘ、Ｙ軸用の消磁コイル３Ｙ及びＺ軸
用の消磁コイル３Ｚが巻回されている。これら各
ピツクアツプコイル２Ｘ，２Ｙ，２Ｚ及び消磁コ
イル３Ｘ，３Ｙ，３Ｚは、実際的には船体１内に
船体と一体となつて動揺するように固定的に設け
られるが、消磁コイル３Ｘ，３Ｙ，３Ｚはピツク
アツプコイル２Ｘ，２Ｙ，２Ｚと同一の大きさで
ある必要はない。 In the hull 1, in directions perpendicular to each other,
A pickup coil 2X for the X axis, a pickup coil 2Y for the Y axis, and a pickup coil 2Z for the Z axis are wound. Furthermore, an X-axis degaussing coil 3X, a Y-axis degaussing coil 3Y, and a Z-axis degaussing coil 3Z are wound around the pickup coils 2X, 2Y, and 2Z. These pick-up coils 2X, 2Y, 2Z and degaussing coils 3X, 3Y, 3Z are actually fixedly provided in the hull 1 so as to move integrally with the hull, but the degaussing coils 3X, 3Y, 3Z does not need to be the same size as the pickup coils 2X, 2Y, and 2Z.
第２図は渦電流磁界消去装置の回路ブロツク図
である。同図において、Ｘ軸用のピツクアツプコ
イル２Ｘは、高入力インピーダンスの直流増幅器
４Ｘに接続され、直流増幅器４Ｘはピツクアツプ
コイル２Ｘに検出される信号を増幅し、その出力
信号を位相調整器５Ｘに入力するようになつてい
る。 FIG. 2 is a circuit block diagram of the eddy current magnetic field canceling device. In the figure, the X-axis pickup coil 2X is connected to a high input impedance DC amplifier 4X, which amplifies the signal detected by the pickup coil 2X, and inputs the output signal to the phase adjuster 5X. I'm starting to do that.
位相調整器５Ｘは、第３図に示すように、直流
増幅器４Ｘの出力Viを入力に受ける微分回路５
１Ｘと、直流増幅器４Ｘの出力Viと微分回路５
１Ｘの出力Veとを入力に受けて加算する加算器
５２Ｘとから構成され、金属体に発生する渦電流
による磁界と消磁コイル３Ｘによる磁界がちよう
ど逆位相となるように調整するための回路であ
る。 As shown in FIG. 3, the phase adjuster 5X includes a differentiating circuit 5 that receives the output Vi of the DC amplifier 4X at its input.
1X, output Vi of DC amplifier 4X, and differential circuit 5
This circuit is composed of an adder 52X that receives and adds the output Ve of 1X as an input, and adjusts the magnetic field due to the eddy current generated in the metal body and the magnetic field due to the degaussing coil 3X to be in opposite phases. be.
この位相調整器５Ｘにおいて、
Vi＝Vsinωtとすると、その微分出力VeはVe
＝ω・Vcosωtとなり、加算器５２Ｘの出力Voは
Vo＝Vsinωt＋Ｋ・ω・Vcosωt
＝√2＋（・・）2sin（ωt＋φ）
但し、φ＝tan-1Ｋ・ω・Ｖ／Ｖ
となる。上記φより、Ｋの値を変えることによ
り、位相調整を行うことができることがわかる。 In this phase adjuster 5X, if Vi=Vsinωt, the differential output Ve is Ve
=ω·Vcosωt, and the output Vo of the adder 52X is Vo=Vsinωt+K·ω·Vcosωt =√ 2 +(···) 2 sin(ωt+φ) However, φ=tan −1 K·ω·V/V. It can be seen from the above φ that phase adjustment can be performed by changing the value of K.
Ｙ軸用のピツクアツプコイル２Ｙも同様に直流
増幅器４Ｙに接続され、直流増幅器４Ｙの出力は
位相調整器５Ｙに接続されている。また、Ｚ軸用
のピツクアツプコイル２Ｚも直流増幅器４Ｚに接
続され、直流増幅器４Ｚの出力は位相調整器５Ｚ
に接続されている。 The Y-axis pickup coil 2Y is similarly connected to a DC amplifier 4Y, and the output of the DC amplifier 4Y is connected to a phase adjuster 5Y. Further, the Z-axis pickup coil 2Z is also connected to the DC amplifier 4Z, and the output of the DC amplifier 4Z is connected to the phase adjuster 5Z.
It is connected to the.
位相調整器５Ｙ，５Ｚも第３図に示す位相調整
器５Ｘと同様に構成されており、各位相調整器５
Ｘ，５Ｙ，５Ｚの出力は、それぞれいずれの加算
器６Ｘ，６Ｙ，６Ｚにも入力されるようになつて
いる。加算器６Ｘ，６Ｙ，６Ｚの各出力は、夫々
消磁コイル３Ｘ，３Ｙ，３Ｚに加えられるように
なつている。 The phase adjusters 5Y and 5Z are also configured similarly to the phase adjuster 5X shown in FIG.
The outputs of X, 5Y, and 5Z are input to adders 6X, 6Y, and 6Z, respectively. The outputs of adders 6X, 6Y, and 6Z are applied to demagnetizing coils 3X, 3Y, and 3Z, respectively.
加算器６Ｘ，６Ｙ，６Ｚは、金属による渦電流
磁界の軸方向と消磁コイル３Ｘ，３Ｙ，３Ｚによ
る発生磁界の軸方向がずれている場合に、他の消
磁コイルに電流を流して軸の補正を行うために設
けられている。 Adders 6X, 6Y, and 6Z correct the axes by supplying current to other degaussing coils when the axial direction of the eddy current magnetic field caused by the metal and the axial direction of the magnetic fields generated by the degaussing coils 3X, 3Y, and 3Z are misaligned. It is set up to do this.
このことについて、第４図を参照して、若干説
明する。第４図において、金属体である船体１に
より発生する渦電流磁界をHexとする。一方Ｘ軸
消磁コイルによる磁界をHxとし、両磁界Hex、
Hxが平行でなく、角度ずれがあると、磁界Hxは
HxoとHzxに分解され、Hxoのみが、渦電流磁
界Hexの打ち消しに寄与し、Hzxは打ち消し磁界
がなく補償残磁界となり、外部に表れることにな
る。この残磁界Hzxを打ち消すため、Ｚ軸消磁コ
イル３Ｚに電流を流し、Hzxと逆方向の磁界を発
生させる。加算器６Ｚ等は、このために設けられ
ている。従つて両磁界の軸方向が平行であれば、
この加算器６Ｘ，６Ｙ，６Ｚは不要である。 This will be briefly explained with reference to FIG. In FIG. 4, the eddy current magnetic field generated by the hull 1, which is a metal body, is represented by Hex. On the other hand, the magnetic field by the X-axis demagnetizing coil is Hx, and both magnetic fields Hex,
If Hx is not parallel and there is an angular deviation, the magnetic field Hx will be
It is decomposed into Hxo and Hzx, and only Hxo contributes to canceling the eddy current magnetic field Hex, while Hzx has no canceling magnetic field and becomes a compensation residual magnetic field, which appears externally. In order to cancel this residual magnetic field Hzx, current is passed through the Z-axis demagnetizing coil 3Z to generate a magnetic field in the opposite direction to Hzx. The adder 6Z and the like are provided for this purpose. Therefore, if the axes of both magnetic fields are parallel,
These adders 6X, 6Y, and 6Z are unnecessary.
上記実施例装置において、船体１が動揺する
と、船体１に加わる地磁気の３成分（Ｘ軸、Ｙ
軸、Ｚ軸）の変化が各ピツクアツプコイル２Ｘ，
２Ｙ，２Ｚで検出される。すなわちピツクアツプ
コイル２Ｘ，２Ｙ，２Ｚには、地磁気の変化に応
じた電圧が誘起される。この誘起電圧が直流増幅
器４Ｘ，４Ｙ，４Ｚで増幅され、さらに位相調整
器５Ｘ，５Ｙ，５Ｚで位相調整され、各加算器６
Ｘ，６Ｙ，６Ｚを経て各消磁コイル３Ｘ，３Ｙ，
３Ｚに加えられ、各消磁コイル３Ｘ，３Ｙ，３Ｚ
に渦電流磁界とは逆相の磁界を発生する電流を流
す。これにより渦電流磁界は完全に打ち消され
る。 In the above embodiment device, when the hull 1 is shaken, three components of the earth's magnetic field (X-axis, Y-axis,
axis, Z axis) changes in each pick-up coil 2X,
Detected at 2Y and 2Z. That is, voltages are induced in the pickup coils 2X, 2Y, and 2Z in accordance with changes in the earth's magnetism. This induced voltage is amplified by DC amplifiers 4X, 4Y, 4Z, further phase adjusted by phase adjusters 5X, 5Y, 5Z, and each adder 6
Through X, 6Y, 6Z, each degaussing coil 3X, 3Y,
3Z, each degaussing coil 3X, 3Y, 3Z
A current that generates a magnetic field with a phase opposite to that of the eddy current magnetic field is passed through the eddy current magnetic field. This completely cancels out the eddy current magnetic field.
（発明の効果）
以上説明したように、本発明の渦電流磁界消去
装置によれば、船体等の金属体に生じる渦電流磁
界を消去できるので、磁性体の磁化に起因する磁
気に対する消磁装置と併用すれば、船体等の金属
体の消磁を完全に行うことができる。(Effects of the Invention) As explained above, the eddy current magnetic field erasing device of the present invention can eliminate the eddy current magnetic field generated in a metal body such as a ship's body, so it can be used as a degaussing device for magnetism caused by magnetization of a magnetic body. When used together, metal objects such as ship hulls can be completely demagnetized.
第１図及び第２図は本発明に係る渦電流磁界消
去装置の１実施例を示し、第１図は船体を模式的
に示した斜視図、第２図は渦電流磁界消去装置の
回路ブロツク図、第３図は同装置の位相調整器の
内部構成を示すブロツク図、第４図は同装置の位
相調整器の出力例に設けられる加算器の必要性を
説明するための説明図である。
１……船体、２Ｘ，２Ｙ，２Ｚ……ピツクアツ
プコイル、３Ｘ，３Ｙ，３Ｚ……消磁コイル、４
Ｘ，４Ｙ，４Ｚ……直流増幅器、５Ｘ，５Ｙ，５
Ｚ……位相調整器、６Ｘ，６Ｙ，６Ｚ……加算
器。
1 and 2 show one embodiment of the eddy current magnetic field canceling device according to the present invention, FIG. 1 is a perspective view schematically showing the hull, and FIG. 2 is a circuit block of the eddy current magnetic field canceling device. 3 is a block diagram showing the internal configuration of the phase adjuster of the same device, and FIG. 4 is an explanatory diagram for explaining the necessity of an adder provided in an output example of the phase adjuster of the same device. . 1...Hull, 2X, 2Y, 2Z...Pickup coil, 3X, 3Y, 3Z...Demagnetizing coil, 4
X, 4Y, 4Z...DC amplifier, 5X, 5Y, 5
Z...Phase adjuster, 6X, 6Y, 6Z...Adder.
Claims (1)
部磁界の変化を検出する３個のピツクアツプコイ
ルと、同じく前記金属体の近傍に設けられ、前記
金属体に生じる渦電流磁界を打消す磁界を発生す
るＸ軸消磁コイル、Ｙ軸消磁コイル及びＺ軸消磁
コイルと、前記各ピツクアツプコイルの検出出力
をそれぞれ増幅する増幅手段と、増幅された各信
号成分に基づき、それぞれ渦電流磁界を打消すた
めの信号を出力し、前記Ｘ軸消磁コイル、Ｙ軸消
磁コイル及びＺ軸消磁コイルに与える打消信号出
力手段とを備えたことを特徴とする渦電流磁界消
去装置。1. Three pick-up coils that are installed near the metal body and perpendicular to each other to detect changes in the external magnetic field, and a magnetic field that is also installed near the metal body and generates a magnetic field that cancels the eddy current magnetic field generated in the metal body. Amplifying means for amplifying the detection outputs of the generated X-axis demagnetizing coil, Y-axis demagnetizing coil, and Z-axis demagnetizing coil, and each of the pickup coils, and for canceling the eddy current magnetic field based on each amplified signal component. An eddy current magnetic field erasing device comprising: canceling signal output means for outputting a signal and applying it to the X-axis demagnetizing coil, Y-axis demagnetizing coil, and Z-axis demagnetizing coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6199986A JPS62219904A (en) | 1986-03-22 | 1986-03-22 | Eddy current magnetic field erasing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6199986A JPS62219904A (en) | 1986-03-22 | 1986-03-22 | Eddy current magnetic field erasing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62219904A JPS62219904A (en) | 1987-09-28 |
| JPH0439211B2 true JPH0439211B2 (en) | 1992-06-26 |
Family
ID=13187419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6199986A Granted JPS62219904A (en) | 1986-03-22 | 1986-03-22 | Eddy current magnetic field erasing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62219904A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008145165A (en) * | 2006-12-07 | 2008-06-26 | Siemens Vdo Automotive Corp | Magnetoelastic torque sensor and hysteresis elimination method |
| CN106658316B (en) * | 2016-12-28 | 2022-03-11 | 合肥市菲凡音响有限责任公司 | Moving coil phonograph head demagnetizing device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5811091A (en) * | 1981-07-13 | 1983-01-21 | Ebara Infilco Co Ltd | Deoxidizing method |
| JPS60182706A (en) * | 1984-02-29 | 1985-09-18 | Shimadzu Corp | Determining method of optimum ampere-turn of coil |
-
1986
- 1986-03-22 JP JP6199986A patent/JPS62219904A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5811091A (en) * | 1981-07-13 | 1983-01-21 | Ebara Infilco Co Ltd | Deoxidizing method |
| JPS60182706A (en) * | 1984-02-29 | 1985-09-18 | Shimadzu Corp | Determining method of optimum ampere-turn of coil |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62219904A (en) | 1987-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |