JP4506302B2 - Mounting method and inspection method of magnet for exciting magnetic sensor - Google Patents

Mounting method and inspection method of magnet for exciting magnetic sensor Download PDF

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JP4506302B2
JP4506302B2 JP2004189573A JP2004189573A JP4506302B2 JP 4506302 B2 JP4506302 B2 JP 4506302B2 JP 2004189573 A JP2004189573 A JP 2004189573A JP 2004189573 A JP2004189573 A JP 2004189573A JP 4506302 B2 JP4506302 B2 JP 4506302B2
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magnet
exciting
rotating body
jig
magnetic sensor
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JP2006010556A (en
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毅 沼上
均 林
浩 青木
雅弘 能登
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Fuji Electric Co Ltd
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Fuji Electric Systems Co Ltd
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Description

この発明は、例えばガスメータ，水道メータ等の流量センサとして用いて好適な、大バルクハウゼン効果を利用する磁気センサ、特にこのような磁気センサを励磁するための励磁用磁石の取付け方法および検査方法に関する。   The present invention relates to a magnetic sensor using a large Barkhausen effect, which is suitable for use as a flow sensor of, for example, a gas meter or a water meter, and more particularly to an attaching method and an inspection method for an exciting magnet for exciting such a magnetic sensor. .

従来、大バルクハウゼン効果を利用する流量センサは、例えば特許文献１により公知である。図２〜４はこのような流量センサを説明するための説明図である。
センサ素子は図２に示すように、大バルクハウゼン効果を利用する鉄芯２ａに検出コイル２ｂを巻いて構成される。大バルクハウゼン効果を利用する鉄芯２ａとしては、アモルファス素子を繊維状に構成したものや強磁性体のワイヤなどが知られている。 Conventionally, a flow sensor that uses the large Barkhausen effect is known from, for example, Japanese Patent Application Laid-Open No. H10-228707. 2-4 is explanatory drawing for demonstrating such a flow sensor.
As shown in FIG. 2, the sensor element is configured by winding a detection coil 2b around an iron core 2a that utilizes the large Barkhausen effect. Known examples of the iron core 2a using the large Barkhausen effect include an amorphous element formed in a fiber shape and a ferromagnetic wire.

図２のようなセンサ（素子）２を作動させるためには、例えば図３のように回転体（磁石ホルダ）４上にその中心を挟んで一対の励滋用磁石１を配置し、これを回転体の中心軸の周りで回転させ、磁束変化をセンサ２に与えて出力を得るものが一般的である。なお、図３（ａ）は上面図、同（ｂ）は側面図を示す。
このような構成において、センサ２に対し図４（ａ）に示されるような磁界（磁束）Φが印加されると、印加磁界の極性が反転する度に、センサ２の検出コイル２ｂには図４（ｂ）のようなパルス電圧Ｓが誘起される。 In order to operate the sensor (element) 2 as shown in FIG. 2, for example, as shown in FIG. 3, a pair of exciting magnets 1 are arranged on the rotating body (magnet holder) 4 with the center thereof interposed therebetween. In general, the rotating body is rotated around the central axis, and a change in magnetic flux is applied to the sensor 2 to obtain an output. 3A is a top view and FIG. 3B is a side view.
In such a configuration, when a magnetic field (magnetic flux) Φ as shown in FIG. 4A is applied to the sensor 2, every time the polarity of the applied magnetic field is reversed, the detection coil 2b of the sensor 2 is shown in FIG. A pulse voltage S like 4 (b) is induced.

特開２０００−２２１０６９号公報（第２−３頁、図１−３）JP 2000-221069 (page 2-3, FIG. 1-3)

ところで、上記のようなセンサでは、印加する磁界の方向を順次変えるようにするため、励磁用磁石の取付けに当ってはその方向を考慮しなければならず、作業が煩雑になるだけでなく取付けを誤まるおそれも生じるという問題がある。
したがって、この発明の課題は、センサを励磁するための励磁用磁石を簡単かつ正確に取り付けられるようにすることにある。 By the way, in the sensor as described above, the direction of the magnetic field to be applied is changed sequentially, so that the direction of the excitation magnet must be taken into consideration, which not only complicates the work but also attaches it. There is also a problem that a mistake may occur.
Therefore, an object of the present invention is to make it possible to easily and accurately attach an exciting magnet for exciting a sensor.

このような課題を解決するため、請求項１の発明では、大バルクハウゼン効果を有する鉄芯に印加される磁界の極性が変化する毎に電圧を出力する素子に対し、中心を挟み少なくとも一対の励磁用磁石を配置した回転体を対向設置し、回転する前記励磁用磁石から発生する磁界の変化により前記素子を動作させる磁気センサにおいて、
前記回転体に励磁用磁石を取り付けるに当たっては、回転体を一時的に固定する治具を用いるとともに、この治具には回転体に取り付けるべき励磁用磁石と対応する位置に、その励磁用磁石の回転体への取付けを許容する極性の磁石を予め固定しておくことを特徴とする。
この請求項１の発明においては、前記治具を用い、前記回転体に取り付けるべき励磁用磁石の適否を検査可能にすることができる（請求項２の発明）。 In order to solve such a problem, in the invention of claim 1, at least a pair of elements sandwiching the center with respect to an element that outputs a voltage every time the polarity of a magnetic field applied to an iron core having a large Barkhausen effect changes. In a magnetic sensor in which a rotating body in which an exciting magnet is arranged is placed oppositely and the element is operated by a change in a magnetic field generated from the rotating exciting magnet,
In attaching the exciting magnet to the rotating body, a jig for temporarily fixing the rotating body is used, and in this jig, the exciting magnet is positioned at a position corresponding to the exciting magnet to be attached to the rotating body. A magnet having a polarity that allows attachment to a rotating body is fixed in advance.
According to the first aspect of the present invention, it is possible to inspect the suitability of the magnet for excitation to be attached to the rotating body using the jig (the second aspect of the invention).

この発明によれば、治具を用いるようにしたので、励磁用磁石を容易かつ正確に取り付けることができるだけでなく、取り付けるべき励磁用磁石の極性の適否を正確にチェックすることができ、信頼性を向上させることができる。   According to the present invention, since the jig is used, not only can the excitation magnet be easily and accurately attached, but also the correctness of the polarity of the excitation magnet to be attached can be checked accurately, Can be improved.

図１はこの発明の実施の形態を説明するための説明図である。
図１を参照して、図３に示すような場合の磁石の取り付け方につき説明する。
例えば図３では、励磁用の磁石１を図示のような極性で磁石ホルダ４に装着する必要がある。そのためには、図１のような治具３を一時的に利用し、治具３に磁石ホルダ４を装着する。このとき、治具３の装着すべき磁石１と対応する所定位置には、磁石がそれぞれ予め設置（固定）されている。つまり、図１（ｂ）の左側の磁石1に対しては、右側がＳ極で左側がＮ極の磁石1ａを、また、右側の磁石1に対しても、右側がＳ極で左側がＮ極の磁石１ｂをそれぞれ配置（固定）しておく。その磁石1ａ，１ｂの極性（方向）は、磁石ホルダ４に装着すべき磁石1の極性（方向）によって決まることになる。 FIG. 1 is an explanatory diagram for explaining an embodiment of the present invention.
With reference to FIG. 1, it demonstrates per how to attach the magnet in the case as shown in FIG.
For example, in FIG. 3, it is necessary to attach the magnet 1 for excitation to the magnet holder 4 with the polarity as shown. For this purpose, the jig 3 as shown in FIG. 1 is temporarily used, and the magnet holder 4 is attached to the jig 3. At this time, magnets are respectively installed (fixed) in advance at predetermined positions corresponding to the magnets 1 to which the jig 3 is to be mounted. That is, for the left side magnet 1 in FIG. 1B, the right side is the S pole and the left side is the N pole magnet 1a. Also, for the right side magnet 1, the right side is the S pole and the left side is N. The pole magnets 1b are respectively arranged (fixed). The polarities (directions) of the magnets 1 a and 1 b are determined by the polarities (directions) of the magnets 1 to be mounted on the magnet holder 4.

さらには、磁石ホルダ４および治具３には、図１（ａ）にＢ部として示す部分で、両者の固定位置関係が一義的に決まるような溝および突起を形成しておくことにより、正確な位置決めがなされるようにしている。
こうすることで、治具３に磁石ホルダ４を固定し励磁用磁石１を挿入するに当り、治具３に固定された磁石の磁力により挿入すべき磁石が吸引されるようになり、磁石ホルダ４に磁石１を誤りなく容易に挿入できるようになる。以上では、磁石が１個ずつ１対の場合を説明したが２個以上の対でも良く、さらには円周上に複数対配置する場合にも同様にして適用することができる。 Furthermore, the magnet holder 4 and the jig 3 are formed with grooves and projections that are uniquely determined at the portion indicated by B in FIG. Is positioned properly.
By doing so, when the magnet holder 4 is fixed to the jig 3 and the exciting magnet 1 is inserted, the magnet to be inserted is attracted by the magnetic force of the magnet fixed to the jig 3, and the magnet holder The magnet 1 can be easily inserted into the 4 without error. In the above description, the case of one pair of magnets has been described, but two or more pairs may be used, and the present invention can also be applied to a case where a plurality of pairs are arranged on the circumference.

また、何らかの事情により、励磁用磁石１の磁石ホルダ４への取付けを誤ると、磁石ホルダ４と治具３との間に吸引（または反発）方向の力が働かないので、この性質を利用することにより、磁石１が磁石ホルダ４に正しく取り付けられているかどうかの検査（チェック）を行なうことも可能である。   In addition, if the excitation magnet 1 is incorrectly attached to the magnet holder 4 for some reason, a force in the attraction (or repulsion) direction does not work between the magnet holder 4 and the jig 3, so this property is used. Thus, it is possible to inspect (check) whether the magnet 1 is correctly attached to the magnet holder 4.

この発明の実施の形態を説明する説明図Explanatory drawing explaining embodiment of this invention 従来の大バルクハウゼン効果を用いたセンサを示す外観図External view showing a sensor using the conventional large Barkhausen effect 図２のセンサの駆動原理を説明するための説明図Explanatory drawing for demonstrating the drive principle of the sensor of FIG. 図２のセンサの駆動方法を説明するための波形図Waveform diagram for explaining a method of driving the sensor of FIG.

符号の説明Explanation of symbols

１，１ａ，１ｂ…磁石、２…センサ（素子）、２ａ…鉄芯、２ｂ…検出コイル、３…治具、４…磁石ホルダ。

DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Magnet, 2 ... Sensor (element), 2a ... Iron core, 2b ... Detection coil, 3 ... Jig, 4 ... Magnet holder.

Claims (2)

大バルクハウゼン効果を有する鉄芯に印加される磁界の極性が変化する毎に電圧を出力する素子に対し、中心を挟み少なくとも一対の励磁用磁石を配置した回転体を対向設置し、回転する前記励磁用磁石から発生する磁界の変化により前記素子を動作させる磁気センサにおいて、
前記回転体に励磁用磁石を取り付けるに当たっては、回転体を一時的に固定する治具を用いるとともに、この治具には回転体に取り付けるべき励磁用磁石と対応する位置に、その励磁用磁石の回転体への取付けを許容する極性の磁石を予め固定しておくことを特徴とする磁気センサ励磁用磁石の取付け方法。 The rotating body in which the rotating body having at least a pair of exciting magnets arranged between the centers is opposed to the element that outputs a voltage every time the polarity of the magnetic field applied to the iron core having the large Barkhausen effect changes, and rotates. In a magnetic sensor that operates the element by a change in a magnetic field generated from an exciting magnet,
In attaching the exciting magnet to the rotating body, a jig for temporarily fixing the rotating body is used, and in this jig, the exciting magnet is positioned at a position corresponding to the exciting magnet to be attached to the rotating body. A method of attaching a magnet for exciting a magnetic sensor, wherein a magnet having a polarity that allows attachment to a rotating body is fixed in advance. 前記治具を用い、前記回転体に取り付けるべき励磁用磁石の適否を検査可能にしたことを特徴とする請求項１に記載の磁気センサ励磁用磁石の取付け検査方法。

2. The method for inspecting the attachment of a magnet for exciting a magnetic sensor according to claim 1, wherein the jig is used to inspect the suitability of the exciting magnet to be attached to the rotating body.

JP2004189573A 2004-06-28 2004-06-28 Mounting method and inspection method of magnet for exciting magnetic sensor Expired - Fee Related JP4506302B2 (en)

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JP2007225536A (en) * 2006-02-27 2007-09-06 Nikkoshi Co Ltd Device for detecting rotary motion
JP5220769B2 (en) * 2007-02-12 2013-06-26 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Modular electrical system
JP5664304B2 (en) * 2011-02-09 2015-02-04 三菱電機株式会社 Magnetic position detector
CN206237268U (en) * 2015-12-28 2017-06-09 清华大学 The device of permanent magnet polarity mistake is prevented in the splicing of planar motor permanent magnet array

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JP2000221069A (en) * 1999-01-29 2000-08-11 Matsushita Electric Ind Co Ltd Flow rate detection device
JP2005156173A (en) * 2003-11-20 2005-06-16 Yaskawa Electric Corp Apparatus and method for aligning magnetic encoder

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2000221069A (en) * 1999-01-29 2000-08-11 Matsushita Electric Ind Co Ltd Flow rate detection device
JP2005156173A (en) * 2003-11-20 2005-06-16 Yaskawa Electric Corp Apparatus and method for aligning magnetic encoder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105074474A (en) * 2013-02-22 2015-11-18 三菱电机株式会社 Rotation speed detector

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