JP2013186058A - Magnetic type potentiometer - Google Patents

Magnetic type potentiometer Download PDF

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JP2013186058A
JP2013186058A JP2012053207A JP2012053207A JP2013186058A JP 2013186058 A JP2013186058 A JP 2013186058A JP 2012053207 A JP2012053207 A JP 2012053207A JP 2012053207 A JP2012053207 A JP 2012053207A JP 2013186058 A JP2013186058 A JP 2013186058A
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magnetic
magnet
magnetic sensor
collecting plate
potentiometer
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Akira Saruwatari
亮 猿渡
Hiroaki Narita
浩昭 成田
Hideaki Someya
秀明 染谷
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Azbil Corp
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Azbil Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a magnetic type potentiometer capable of attaining down-sizing and enhancing a degree of freedom of attachment.SOLUTION: In a magnetic type potentiometer, a magnetic-flux collecting plate 3 is provided on the opposite side to a side of a magnet 1 facing a magnetic detection part 2a (a magnetic sensing surface) of a magnetic sensor 2 (a hall element or an MR element). The magnetic-flux collecting plate 3 absorbing a part of magnetic flux from the magnet 1 can reduce magnetic flux density acting on the magnetic sensor 2 and decrease a gap G between the magnet 1 and the magnetic sensor 2 without enlarging a size W in a width direction to attain down-sizing. Since the magnetic-flux collecting plate 3 is not positioned between the magnet 1 and the magnetic sensor 2, the gap G between the magnet 1 and the magnetic sensor 2 can be freely set and a degree of freedom of attachment can be enhanced. Attachment errors of the magnet 1 and the magnetic sensor 2 can be reduced by the down-sizing, and consequently a detection error can be reduced.

Description

この発明は、磁石と磁気センサとを用いた磁気式ポテンショメータに関するものである。   The present invention relates to a magnetic potentiometer using a magnet and a magnetic sensor.

従来より、電動バルブアクチュエータなどの回転角度の検出にポテンショメータが用いられている。このポテンショメータの回転角度の検出方式には、接触式と非接触式がある。接触式では摩耗による劣化の問題があるのに対して、非接触式ではそのような問題が生じず、寿命が長い。   Conventionally, a potentiometer has been used to detect a rotation angle of an electric valve actuator or the like. There are a contact type and a non-contact type as a detection method of the rotation angle of the potentiometer. The contact type has a problem of deterioration due to wear, whereas the non-contact type does not cause such a problem and has a long life.

非接触式には、主に光の透過や反射を利用した光学式と、磁界の方向の変化を検知する磁気式に大別できる。光学式は塵埃の影響を受け易いのに対して、磁気式は塵埃の影響を受け難く、電動バルブアクチュエータ用のポテンショメータとしては有望である。   The non-contact type can be broadly divided into an optical type mainly using transmission and reflection of light and a magnetic type that detects a change in the direction of the magnetic field. While the optical type is easily affected by dust, the magnetic type is hardly affected by dust, and is promising as a potentiometer for an electric valve actuator.

特開２００４−１８４３１９号公報JP 2004-184319 A

しかしながら、磁気式のポテンショメータは検出範囲が狭く、大きいものが多い。図６に従来の磁気式ポテンショメータの要部を示す。同図において、１は円板状の磁石、２はこの磁石１が作る磁界の方向を検出する磁気センサである。磁石１は、図７に示すように、その径方向の一方がＳ極、他方がＮ極に着磁されており、その中心Ｏを軸心として回転する。   However, many magnetic potentiometers have a narrow detection range and are large. FIG. 6 shows a main part of a conventional magnetic potentiometer. In the figure, reference numeral 1 denotes a disk-shaped magnet, and 2 denotes a magnetic sensor for detecting the direction of a magnetic field generated by the magnet 1. As shown in FIG. 7, the magnet 1 is magnetized so that one of its radial directions is an S pole and the other is an N pole, and rotates about its center O as an axis.

磁気センサ２としては、ホール素子やＭＲ素子（磁気抵抗効果素子）が用いられ、所定の検出磁場範囲を有する。このため、磁石１から発せられる磁場が大きすぎてその検出磁場範囲を満たさない場合は、図８（ａ）に示されるように磁石１と磁気センサ２との間のギャップＧを大きくしたり、図８（ｂ）に示されるように磁石１の径φを大きくしたりする必要がある。このため、図８（ａ）の場合、高さ方向の寸法Ｌが大きくなり、図８（ｂ）の場合、幅方向の寸法Ｗが大きくなり、小型化が困難となる。   As the magnetic sensor 2, a Hall element or an MR element (magnetoresistance effect element) is used and has a predetermined detection magnetic field range. For this reason, when the magnetic field emitted from the magnet 1 is too large to satisfy the detected magnetic field range, the gap G between the magnet 1 and the magnetic sensor 2 is increased as shown in FIG. It is necessary to increase the diameter φ of the magnet 1 as shown in FIG. For this reason, in the case of FIG. 8A, the dimension L in the height direction becomes large, and in the case of FIG. 8B, the dimension W in the width direction becomes large, which makes it difficult to reduce the size.

このような理由から、磁気式ポテンショメータは大きいものが多く、十分なスペースや現状の取付状態から改造できる自由度がないような場合、小型の接触式のポテンショメータとの置き換えが困難で、これまでの電動バルブアクチュエータでは接触式のポテンショメータが用いられ続けている。   For this reason, magnetic potentiometers are often large, and it is difficult to replace with small contact-type potentiometers if there is not enough space and the flexibility to modify from the current installation state. Contact potentiometers continue to be used in electric valve actuators.

なお、特許文献１には、磁石１と磁気センサ２との間に集磁器を設けた構成が記載されている。この場合、集磁器が磁石１からの磁束の一部を吸い込むので、磁気センサ２に作用する磁束密度が小さくなり、幅方向の寸法Ｗを大きくすることなく、磁石１と磁気センサ２との間のギャップＧを小さくすることが可能となる。   Patent Document 1 describes a configuration in which a magnetic collector is provided between a magnet 1 and a magnetic sensor 2. In this case, since the magnetic current collector sucks a part of the magnetic flux from the magnet 1, the magnetic flux density acting on the magnetic sensor 2 is reduced, so that the dimension W in the width direction is not increased, and the gap between the magnet 1 and the magnetic sensor 2 is increased. The gap G can be reduced.

しかしながら、この特許文献１に示された構成では、磁石１と磁気センサ２との間に集磁器が位置しているので、集磁器の厚み以上に磁気センサ２を磁石１に近づけることができない。このため、磁石１と磁気センサ２との間のギャップＧを自由に設定することができず、取り付けの自由度が低下してしまう。   However, in the configuration disclosed in Patent Document 1, since the magnetic collector is located between the magnet 1 and the magnetic sensor 2, the magnetic sensor 2 cannot be brought closer to the magnet 1 than the thickness of the magnetic collector. For this reason, the gap G between the magnet 1 and the magnetic sensor 2 cannot be set freely, and the degree of freedom of attachment is reduced.

本発明は、このような課題を解決するためになされたもので、その目的とするところは、小型化を図るとともに、取り付けの自由度を高めることが可能な磁気式ポテンショメータを提供することにある。
また、小型化することで、磁石と磁気センサの取付誤差を小さくでき、その結果、検出誤差を小さくことが可能な磁気式ポテンショメータを提供することにある。 The present invention has been made to solve such problems, and an object of the present invention is to provide a magnetic potentiometer capable of reducing the size and increasing the degree of freedom of attachment. .
Another object of the present invention is to provide a magnetic potentiometer that can reduce the mounting error between the magnet and the magnetic sensor by reducing the size, thereby reducing the detection error.

このような目的を達成するために本発明は、磁石と、この磁石が作る磁界の方向を検出する磁気センサとを備えた磁気式ポテンショメータにおいて、磁石の磁気センサの磁界の検出部と対向する側とは反対側に集磁板を設けたことを特徴とする。   In order to achieve such an object, the present invention provides a magnetic potentiometer including a magnet and a magnetic sensor for detecting the direction of the magnetic field generated by the magnet, on the side facing the magnetic field detection unit of the magnetic sensor of the magnet. It is characterized in that a magnetism collecting plate is provided on the opposite side.

この発明によれば、集磁板が磁石からの磁束の一部を吸い込むので、磁気センサに作用する磁束密度が小さくなり、幅方向の寸法Ｗを大きくすることなく、磁石と磁気センサとの間のギャップＧを小さくすることが可能となる。これにより、磁気式ポテンショメータの小型化を図って、電動バルブアクチュエータでの使用が可能となる。   According to the present invention, since the magnetic flux collecting plate sucks a part of the magnetic flux from the magnet, the magnetic flux density acting on the magnetic sensor is reduced, and the gap between the magnet and the magnetic sensor is not increased without increasing the dimension W in the width direction. The gap G can be reduced. As a result, the magnetic potentiometer can be miniaturized and used with an electric valve actuator.

また、この発明によれば、磁石の磁気センサの磁界の検出部と対向する側とは反対側に集磁板が位置しているので、すなわち磁石と磁気センサとの間には集磁板が位置していないので、磁石と磁気センサとの間のギャップＧを自由に設定することが可能となり、取り付けの自由度が高まる。   In addition, according to the present invention, the magnetism collecting plate is located on the side opposite to the side facing the magnetic field detection portion of the magnet magnetic sensor, that is, the magnetism collecting plate is located between the magnet and the magnetic sensor. Since it is not located, it becomes possible to freely set the gap G between the magnet and the magnetic sensor, and the degree of freedom of attachment increases.

本発明によれば、磁石の磁気センサの磁界の検出部と対向する側とは反対側に集磁板を設けたので、集磁板が磁石からの磁束の一部を吸い込むものとなり、幅方向の寸法Ｗを大きくすることなく、磁石と磁気センサとの間のギャップＧを小さくして、小型化を図り、電動バルブアクチュエータでの使用が可能となる。また、磁石と磁気センサとの間のギャップＧを自由に設定することが可能となり、取り付けの自由度が高まるものとなる。また、小型化することで、磁石と磁気センサの取付誤差を小さくでき、その結果、検出誤差を小さくことが可能となる。   According to the present invention, since the magnetism collecting plate is provided on the opposite side of the magnet from the side facing the magnetic field detecting portion of the magnetic sensor, the magnetism collecting plate absorbs a part of the magnetic flux from the magnet, and the width direction Without increasing the dimension W, the gap G between the magnet and the magnetic sensor can be reduced to achieve miniaturization and use in the electric valve actuator. Further, the gap G between the magnet and the magnetic sensor can be set freely, and the degree of freedom of attachment is increased. Further, by reducing the size, the mounting error between the magnet and the magnetic sensor can be reduced, and as a result, the detection error can be reduced.

本発明に係る磁気式ポテンショメータの一実施の形態の要部を示す図である。It is a figure which shows the principal part of one Embodiment of the magnetic potentiometer which concerns on this invention. この磁気式ポテンショメータの磁石の下面に接合された集磁板の平面図である。It is a top view of the magnetic flux collecting plate joined to the lower surface of the magnet of this magnetic potentiometer. この磁気式ポテンショメータを使用した電動バルブアクチュエータの要部の構造を示す図である。It is a figure which shows the structure of the principal part of the electric valve actuator using this magnetic potentiometer. この電動バルブアクチュエータにおける開度検出部の斜視図である。It is a perspective view of the opening degree detection part in this electric valve actuator. この電動バルブアクチュエータにおける開度検出部の分解斜視図である。It is a disassembled perspective view of the opening degree detection part in this electric valve actuator. 従来の磁気式ポテンショメータの要部を示す図である。It is a figure which shows the principal part of the conventional magnetic potentiometer. この磁気式ポテンショメータに用いられる磁石の平面図である。It is a top view of the magnet used for this magnetic potentiometer. 磁石と磁気センサとの間のギャップＧを大きくした例および磁石の径φを大きくした例を示す図である。It is a figure which shows the example which enlarged the gap G between a magnet and a magnetic sensor, and the example which enlarged diameter φ of the magnet.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１は本発明に係る磁気式ポテンショメータの一実施の形態の要部を示す図である。同図において、図８と同一符号は図８を参照して説明した構成要素と同一或いは同等構成要素を示し、その説明は省略する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a main part of an embodiment of a magnetic potentiometer according to the present invention. In FIG. 8, the same reference numerals as those in FIG. 8 denote the same or equivalent components as those described with reference to FIG.

この磁気式ポテンショメータ１００では、磁石１の磁気センサ２の磁界の検出部（感磁面）２ａと対向する側（上面）１ａとは反対側（下面）１ｂに、集磁板３を接合している。集磁板３は、磁石１と同径の円板状とされ（図２参照）、厚みｔを有する。   In this magnetic potentiometer 100, a magnetism collecting plate 3 is joined to a side (upper surface) 1b opposite to a side (upper surface) 1a of the magnetic sensor 2 of the magnet 1 opposite to the magnetic field detection part (magnetic sensing surface) 2a. Yes. The magnetism collecting plate 3 is a disk having the same diameter as the magnet 1 (see FIG. 2) and has a thickness t.

また、集磁板３は、強磁性体であり、高透磁率材料からなる。強磁性体とは、平易に磁性を帯びることができる物質をいい、透磁率μが非常に大きいものをいう。地球上に存在する物質の中で常温での強磁性体元素は鉄・ニッケル・コバルトの３つしかない。   The magnetic flux collecting plate 3 is a ferromagnetic material and is made of a high magnetic permeability material. A ferromagnetic material means a substance that can be easily magnetized and has a very high permeability μ. Among the materials that exist on the earth, there are only three ferromagnetic elements at room temperature: iron, nickel, and cobalt.

この磁気式ポテンショメータ１００において、集磁板３としては、一般に電磁鋼板と呼ばれる強磁性体の鋼板を使用している。電磁鋼板は、磁化しやすい結晶方位が一様方向もしくは鋼板のすべての方向に均一な磁化特性が得られるように調質・製造され、一般にはモータやトランスなどに使用される。また、電磁鋼板は、ＪＩＳ Ｃ ２５５３に規定されている厚さ（０．２３，０．２７，０．３０，０．３５）の系列を持ち、電界の強さ８００〔Ａ／ｍ〕における磁束密度（ＢH）は１．７８〜１．８８〔Ｔ〕以上（左記の場合の透磁率μ＝１７７０〜１８７０，（１〔Ｔ〕＝７９５８００〔Ａ／ｍ〕，Ｂ＝μＨより））のものである。 In the magnetic potentiometer 100, as the magnetic flux collecting plate 3, a ferromagnetic steel plate generally called an electromagnetic steel plate is used. Electrical steel sheets are tempered and manufactured so that the crystal orientation that is easily magnetized is uniform or uniform magnetization characteristics are obtained in all directions of the steel sheet, and are generally used for motors and transformers. The electromagnetic steel sheet has a series of thicknesses (0.23, 0.27, 0.30, 0.35) defined in JIS C 2553, and magnetic flux at an electric field strength of 800 [A / m]. The density (B H ) is 1.78 to 1.88 [T] or more (permeability μ = 1770-1870 in the case of the left) (from 1 [T] = 7995800 [A / m], B = μH)) Is.

この磁気式ポテンショメータ１００では、磁石１からの磁束の一部を集磁板３に吸い込ませ、磁気センサ２に作用する磁束密度を小さくし、磁気センサ２の感磁面２ａの磁場が検出磁場範囲を超えないようにしている。これにより、幅方向の寸法Ｗを大きくすることなく、磁石１と磁気センサ２との間のギャップＧを小さくし、磁気式ポテンショメータ１００の小型化を図って、電動バルブアクチュエータでの使用を可能としている。   In this magnetic potentiometer 100, a part of the magnetic flux from the magnet 1 is sucked into the magnetic flux collecting plate 3, the magnetic flux density acting on the magnetic sensor 2 is reduced, and the magnetic field of the magnetic sensitive surface 2a of the magnetic sensor 2 is within the detection magnetic field range. Is not exceeded. As a result, the gap G between the magnet 1 and the magnetic sensor 2 can be reduced without increasing the width dimension W, and the magnetic potentiometer 100 can be miniaturized to be used in an electric valve actuator. Yes.

また、この磁気式ポテンショメータ１００では、磁石１の磁気センサ２の感磁面２ａと対向する側とは反対側に集磁板３が位置しているので、すなわち磁石１と磁気センサ２との間には集磁板３が位置していないので、磁石１と磁気センサ２との間のギャップＧを自由に設定することが可能である。すなわち、集磁板３の厚みｔなどを調整することにより、集磁板３に吸い込ませる磁束の量を調整し、磁気センサ２を可能な限り磁石１に近づけるなど、ギャップＧを自由に設定することが可能である。これにより、取り付けの自由度が高まるものとなる。   Further, in the magnetic potentiometer 100, the magnetism collecting plate 3 is located on the opposite side of the magnet 1 from the side facing the magnetic sensitive surface 2a of the magnetic sensor 2, that is, between the magnet 1 and the magnetic sensor 2. Since the magnetism collecting plate 3 is not located in the gap G, the gap G between the magnet 1 and the magnetic sensor 2 can be set freely. That is, by adjusting the thickness t of the magnetic flux collecting plate 3 and the like, the amount of magnetic flux sucked into the magnetic flux collecting plate 3 is adjusted, and the gap G is freely set such that the magnetic sensor 2 is as close to the magnet 1 as possible. It is possible. Thereby, the freedom degree of attachment increases.

図３にこの磁気式ポテンショメータ１００を使用した電動バルブアクチュエータ２００の要部の構造を示す。同図において、４は弁体、５は弁体４に連結されたシャフト、６はシャフト５に結合されたギヤ、７はケース、８はケース７の上蓋として設けられたキャップ、９は止め輪、１０はモータ、１１，１２はモータ１０の回転力をギヤ６に伝達する歯車、１３はモータ１０やケース７などの取付板である。   FIG. 3 shows the structure of the main part of an electric valve actuator 200 using this magnetic potentiometer 100. In the figure, 4 is a valve body, 5 is a shaft connected to the valve body 4, 6 is a gear coupled to the shaft 5, 7 is a case, 8 is a cap provided as an upper lid of the case 7, and 9 is a retaining ring. Reference numeral 10 denotes a motor, reference numerals 11 and 12 denote gears for transmitting the rotational force of the motor 10 to the gear 6, and reference numeral 13 denotes a mounting plate for the motor 10, the case 7, and the like.

この電動バルブアクチュエータ２００では、モータ１０の回転力が歯車１１，１２を介して図示されていない弁体に伝達される一方、その回転力がギヤ６に伝達され、この伝達力を受けてシャフト５が回転する。   In the electric valve actuator 200, the rotational force of the motor 10 is transmitted to a valve body (not shown) via gears 11 and 12, while the rotational force is transmitted to the gear 6. Rotates.

ケース７内において、シャフト５の後端部には磁石ホルダ１４が嵌合固定されており、この磁石ホルダ１４に磁石１が保持されている。磁石１の下面１ｂには集磁板３が接合されている。ケース７の上部にはＩＣ固定板（非磁性部材）１５が設けられており、このＩＣ固定板１５の上にプリント板１６が固定されている。プリント板１６の下面１６ａには、磁気センサ２が設けられており、その感磁面２ａが磁石１の上面１ａにギャップＧを隔てて対向している。   In the case 7, a magnet holder 14 is fitted and fixed to the rear end portion of the shaft 5, and the magnet 1 is held by the magnet holder 14. A magnetism collecting plate 3 is joined to the lower surface 1 b of the magnet 1. An IC fixing plate (nonmagnetic member) 15 is provided on the upper portion of the case 7, and a printed board 16 is fixed on the IC fixing plate 15. The magnetic sensor 2 is provided on the lower surface 16 a of the printed board 16, and the magnetic sensitive surface 2 a faces the upper surface 1 a of the magnet 1 with a gap G therebetween.

図３において、ケース１７側の構造を開度検出部と呼び、モータ１０側の構造をモータ部と呼び、開度検出部を符号２０１で、モータ部を符号２０２で示す。開度検出部２０１に上述した磁気式ポテンショメータ１００の構成が採用されている。図４に開度検出部２０１の斜視図を示し、図５に開度検出部２０１の分解斜視図を示す。   In FIG. 3, the structure on the case 17 side is referred to as an opening degree detection unit, the structure on the motor 10 side is referred to as a motor unit, the opening degree detection unit is denoted by reference numeral 201, and the motor part is denoted by reference numeral 202. The configuration of the magnetic potentiometer 100 described above is employed in the opening degree detection unit 201. FIG. 4 shows a perspective view of the opening degree detection unit 201, and FIG. 5 shows an exploded perspective view of the opening degree detection unit 201.

なお、上述した実施の形態では、集磁板３を磁石１の下面１ｂに接合するようにしたが、磁石１の下面１ｂに対して集磁板３を離した状態で設けるようにしてもよい。また、集磁板３は、必ずしも磁石１と同径の円板状としなくてもよく、径を小さくしたり、その形を変えたりしてもよい。また、磁石１も必ずしも円板状に限られるものではなく、棒状とするなどしてもよい。   In the above-described embodiment, the magnetism collecting plate 3 is joined to the lower surface 1b of the magnet 1. However, the magnetism collecting plate 3 may be provided in a state of being separated from the lower surface 1b of the magnet 1. . Further, the magnetic flux collecting plate 3 does not necessarily have to be a disk shape having the same diameter as the magnet 1, and the diameter may be reduced or the shape thereof may be changed. Further, the magnet 1 is not necessarily limited to a disc shape, and may be a rod shape.

〔実施の形態の拡張〕
以上、実施の形態を参照して本発明を説明したが、本発明は上記の実施の形態に限定されるものではない。本発明の構成や詳細には、本発明の技術思想の範囲内で当業者が理解し得る様々な変更をすることができる。 [Extension of the embodiment]
The present invention has been described above with reference to the embodiment. However, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention.

１…磁石、１ａ…上面、１ｂ…下面、２…磁気センサ、２ａ…感磁面、３…集磁板、５…シャフト、６…ギア、７…ケース、８…キャップ、９…止め輪、１０…モータ、１１，１２…歯車、１３…取付板、１４…磁石ホルダ、１５…ＩＣ固定板、１６…プリント板、１７…リターンスプリング、１００…磁気式ポテンショメータ、２００…電動バルブアクチュエータ、２０１…開度検出部、２０２…モータ部。   DESCRIPTION OF SYMBOLS 1 ... Magnet, 1a ... Upper surface, 1b ... Lower surface, 2 ... Magnetic sensor, 2a ... Magnetic sensing surface, 3 ... Magnetic current collecting plate, 5 ... Shaft, 6 ... Gear, 7 ... Case, 8 ... Cap, 9 ... Retaining ring, DESCRIPTION OF SYMBOLS 10 ... Motor, 11, 12 ... Gear, 13 ... Mounting plate, 14 ... Magnet holder, 15 ... IC fixing plate, 16 ... Print board, 17 ... Return spring, 100 ... Magnetic potentiometer, 200 ... Electric valve actuator, 201 ... Opening detection unit, 202... Motor unit.

Claims (3)

磁石と、この磁石が作る磁界の方向を検出する磁気センサとを備えた磁気式ポテンショメータにおいて、
前記磁石の前記磁気センサの磁界の検出部と対向する側とは反対側に集磁板が設けられている
ことを特徴とする磁気式ポテンショメータ。 In a magnetic potentiometer comprising a magnet and a magnetic sensor for detecting the direction of the magnetic field produced by the magnet,
A magnetic potentiometer, wherein a magnetism collecting plate is provided on the opposite side of the magnet from the side facing the magnetic field detection part of the magnetic sensor. 請求項１に記載された磁気式ポテンショメータにおいて、
前記集磁板は、前記磁石に接合されている
ことを特徴とする磁気式ポテンショメータ。 The magnetic potentiometer according to claim 1, wherein
The magnetic current collecting plate is bonded to the magnet. A magnetic potentiometer. 請求項１に記載された磁気式ポテンショメータにおいて、
前記集磁板は、強磁性体であり、高透磁率材料である
ことを特徴とする磁気式ポテンショメータ。 The magnetic potentiometer according to claim 1, wherein
The magnetic flux collecting plate is made of a ferromagnetic material and a high permeability material.
JP2012053207A 2012-03-09 2012-03-09 Magnetic type potentiometer Pending JP2013186058A (en)

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WO2003016829A1 (en) * 2001-08-07 2003-02-27 Namiki Seimitsu Houseki Kabushiki Kaisha Magnetic micro encoder and micro motor

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