JPH02136773A - Magnetic sensor - Google Patents

Magnetic sensor

Info

Publication number
JPH02136773A
JPH02136773A JP29212388A JP29212388A JPH02136773A JP H02136773 A JPH02136773 A JP H02136773A JP 29212388 A JP29212388 A JP 29212388A JP 29212388 A JP29212388 A JP 29212388A JP H02136773 A JPH02136773 A JP H02136773A
Authority
JP
Japan
Prior art keywords
coils
detected
core
magnetism
sensor
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.)
Pending
Application number
JP29212388A
Other languages
Japanese (ja)
Inventor
Mitsuyoshi Tokunaga
徳永 光義
Kunisaburo Tomono
伴野 国三郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP29212388A priority Critical patent/JPH02136773A/en
Publication of JPH02136773A publication Critical patent/JPH02136773A/en
Pending legal-status Critical Current

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  • Measuring Magnetic Variables (AREA)

Abstract

PURPOSE:To detect the direction, magnitude and frequency of a magnetic signal which should be detected without changing the direction of a sensor by providing a globular core and three coils which are formed around the core and whose center axes are three-dimensionally crossed with one another. CONSTITUTION:The sensor 10 has the globular core 12 and three coils 14a-14c whose center axes are orthogonally crossed with one another are formed around the core 12. Therefore, electromotive force is generated in the respective coils 14a-14c by the component of magnetism to be detected in the axial direction of the respective coils 14a-14c. By measuring the electromotive force generated in the coils 14a-14c, the direction of the magnetism to be detected is known without changing the position of the sensor 10. The electromotive force generated in the coils 14a-14c of the sensor 10 is in proportion to the magnitude of the magnetism to be detected and it has the same frequency as the magnetism to be detected. Thus, the direction, magnitude and frequency of the magnetism to be detected are simultaneously measured by the sensor 10.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は磁気センサに関し、特にたとえば電気回路中
で発生する磁気ノイズなどを検知するための、磁気セン
サに関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic sensor, and particularly to a magnetic sensor for detecting magnetic noise generated in an electric circuit.

(従来技術) 従来の磁気センサとしては、たとえばホール素子や磁気
抵抗素子あるいはコアに1つのコイルを巻いたものなど
を用いたものがあった。このような磁気センサは、たと
えば電気回路中において発生する磁気ノイズなどを検知
するために用いられる。そして、検知された磁気ノイズ
の方向や大きさなどをもとにして、たとえば磁気シール
ドを施すなどして、電気回路が磁気ノイズから保護され
る。
(Prior Art) Conventional magnetic sensors include those using, for example, a Hall element, a magnetoresistive element, or one in which a single coil is wound around a core. Such a magnetic sensor is used, for example, to detect magnetic noise generated in an electric circuit. Then, based on the direction and magnitude of the detected magnetic noise, the electric circuit is protected from the magnetic noise by, for example, applying a magnetic shield.

(発明が解決しようとする課題) しかしながら、このような従来の磁気センサでは、たと
えば電気回路中の磁気ノイズの方向を知るために、磁気
センサの方向を変えてその方向の磁気ノイズを検知しな
ければならなかった。
(Problem to be Solved by the Invention) However, with such conventional magnetic sensors, for example, in order to know the direction of magnetic noise in an electric circuit, it is necessary to change the direction of the magnetic sensor and detect magnetic noise in that direction. I had to.

それゆえに、この発明の主たる目的は、その方向を変え
ることなく、検出すべき磁気信号の方向、大きさおよび
周波数を知ることができる、磁気センサを提供すること
である。
Therefore, the main object of the present invention is to provide a magnetic sensor that can determine the direction, magnitude, and frequency of a magnetic signal to be detected without changing its direction.

(課題を解決するための手段) この発明は、球状のコアと、コアの周囲に形成され、互
いの中心軸が立体的に交差する少なくとも3つのコイル
とを含む、磁気センサである。
(Means for Solving the Problems) The present invention is a magnetic sensor that includes a spherical core and at least three coils that are formed around the core and whose central axes intersect three-dimensionally.

(作用) 被検出磁気のコイルの軸方向成分によって、ファラデー
の電磁誘導の法則により各コイルに起電力が発生する。
(Operation) An electromotive force is generated in each coil according to Faraday's law of electromagnetic induction due to the axial component of the detected magnetism in the coil.

(発明の効果) この発明によれば、複数のコイルに発生する起電力を測
定することによって、磁気センサを動かすことなく、被
検出磁気の方向を知ることができる。さらに、各コイル
の起電力は、ファラデーの電磁誘導の法則に従うため、
磁気の大きさと周波数とを同時に検出することができる
(Effects of the Invention) According to the present invention, by measuring the electromotive force generated in a plurality of coils, it is possible to know the direction of the detected magnetism without moving the magnetic sensor. Furthermore, since the electromotive force of each coil follows Faraday's law of electromagnetic induction,
Magnetic magnitude and frequency can be detected simultaneously.

この発明の上述の目的、その他の目的、特徴および利点
は、図面を参照して行う以下の実施例の詳細な説明から
一層明らかとなろう。
The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(実施例) 図はこの発明の一実施例を示す図解図である。(Example) The figure is an illustrative view showing one embodiment of the present invention.

この磁気センサlOは球状のコア12を含む。このコア
12の透磁率をμ、真空の透磁率をμ。とすると、たと
えばNi−Znnフシイトコアなどのように、μ/μ。
This magnetic sensor IO includes a spherical core 12. The magnetic permeability of this core 12 is μ, and the magnetic permeability of the vacuum is μ. For example, as in the case of Ni-Znn fusite core, μ/μ.

が1よりかなり大きい材料が選ばれる。これは、後述の
コイルに発生する起電力を大きくするためである。また
、コア12を球状にするのは、被検出磁気がどの方向か
らきても、感度が同じようにするためである。
A material for which is significantly larger than 1 is selected. This is to increase the electromotive force generated in the coil, which will be described later. Further, the reason why the core 12 is made spherical is to ensure that the sensitivity is the same no matter which direction the detected magnetism comes from.

このコア12の周囲には、3つのコイル14a。Around this core 12 are three coils 14a.

14bおよび14Cが形成される。これらのコイル14
a、14bおよび14Cは、その中心軸が互いに直交す
るように形成される。したがって、被検出磁気の各コイ
ル14a、14bおよび14Cの軸方向成分によって、
各コイル14a、14b、14cに起電力が発生する。
14b and 14C are formed. These coils 14
a, 14b and 14C are formed such that their central axes are orthogonal to each other. Therefore, due to the axial component of each coil 14a, 14b, and 14C of the detected magnetism,
Electromotive force is generated in each coil 14a, 14b, 14c.

これらのコイル14a、14b、14cに発生した起電
力を測定することによって、磁気センサ10の位置を動
かすことなく、被検出磁気の方向を知ることができる。
By measuring the electromotive force generated in these coils 14a, 14b, and 14c, the direction of the detected magnetism can be determined without moving the position of the magnetic sensor 10.

また、この磁気センサ10では、ファラデーの電磁誘導
の法則に従って、コイル14a、14b、14cに起電
力が発生するため、この起電力は被検出磁気の大きさに
比例し、さらに被検出磁気の周波数と同じ周波数となる
。つまり、この磁気センサ10を用いれば、被検出磁気
の方向、大きさおよび周波数を同時に測定することがで
きる。
In addition, in this magnetic sensor 10, an electromotive force is generated in the coils 14a, 14b, and 14c according to Faraday's law of electromagnetic induction. It has the same frequency as . That is, by using this magnetic sensor 10, it is possible to simultaneously measure the direction, magnitude, and frequency of the detected magnetism.

なお、コア12の材質には固有の周波数依存性があるた
め、測定しようとする周波数に応じてコアの材料を選択
すればよい。
Note that since the material of the core 12 has inherent frequency dependence, the material of the core may be selected depending on the frequency to be measured.

また、上述の実施例では、3つのコイルを形成したが、
その中心軸が立体的に交差するようにすれば、4つ以上
のコイルを形成してもよい。このようにしても、各コイ
ルに発生する起電力を測定することによって、P&検出
磁気の方向、大きさおよび周波数を同時に測定すること
ができる。
In addition, in the above embodiment, three coils were formed, but
Four or more coils may be formed as long as their central axes intersect three-dimensionally. Even in this case, by measuring the electromotive force generated in each coil, the direction, magnitude, and frequency of the P& detection magnetism can be measured simultaneously.

【図面の簡単な説明】[Brief explanation of the drawing]

図はこの発明の一実施例を示す図解図である。 図において、10は磁気センサ、12はコア、14a、
14bおよび14cはコイルを示す。 1゜ 特許出願人 株式会社 村田製作所 代理人 弁理士 岡 1) 全 啓
The figure is an illustrative diagram showing an embodiment of the present invention. In the figure, 10 is a magnetic sensor, 12 is a core, 14a,
14b and 14c indicate coils. 1゜Patent applicant Murata Manufacturing Co., Ltd. Agent Patent attorney Oka 1) Kei Zen

Claims (1)

【特許請求の範囲】[Claims] 球状のコアと、前記コアの周囲に形成され、互いの中心
軸が立体的に交差する少なくとも3つのコイルとを含む
、磁気センサ。
A magnetic sensor comprising: a spherical core; and at least three coils formed around the core, the central axes of which intersect three-dimensionally.
JP29212388A 1988-11-17 1988-11-17 Magnetic sensor Pending JPH02136773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29212388A JPH02136773A (en) 1988-11-17 1988-11-17 Magnetic sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29212388A JPH02136773A (en) 1988-11-17 1988-11-17 Magnetic sensor

Publications (1)

Publication Number Publication Date
JPH02136773A true JPH02136773A (en) 1990-05-25

Family

ID=17777842

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29212388A Pending JPH02136773A (en) 1988-11-17 1988-11-17 Magnetic sensor

Country Status (1)

Country Link
JP (1) JPH02136773A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006343180A (en) * 2005-06-08 2006-12-21 Hioki Ee Corp Magnetic detection coil element and multi-axis magnetic detection coil
JP2006343196A (en) * 2005-06-08 2006-12-21 Hioki Ee Corp Magnetic field sensor
JP2013205308A (en) * 2012-03-29 2013-10-07 Hioki Ee Corp Magnetic field sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006343180A (en) * 2005-06-08 2006-12-21 Hioki Ee Corp Magnetic detection coil element and multi-axis magnetic detection coil
JP2006343196A (en) * 2005-06-08 2006-12-21 Hioki Ee Corp Magnetic field sensor
JP2013205308A (en) * 2012-03-29 2013-10-07 Hioki Ee Corp Magnetic field sensor

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