JP3886423B2 - Magnetic field detector - Google Patents

Magnetic field detector Download PDF

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Publication number
JP3886423B2
JP3886423B2 JP2002213462A JP2002213462A JP3886423B2 JP 3886423 B2 JP3886423 B2 JP 3886423B2 JP 2002213462 A JP2002213462 A JP 2002213462A JP 2002213462 A JP2002213462 A JP 2002213462A JP 3886423 B2 JP3886423 B2 JP 3886423B2
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Japan
Prior art keywords
magnetic field
shielding member
detection element
jig
magnetic
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Expired - Lifetime
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JP2002213462A
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Japanese (ja)
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JP2004053499A (en
Inventor
克道 杉原
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KYB Corp
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KYB Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、非接触型の電流センサ等に用いられる磁界検出器の改良に関するものである。
【0002】
【従来の技術】
従来、この種の磁界検出器として、例えば筒状の磁界遮蔽部材を磁性材によって形成し、この磁界遮蔽部材の内側に配置されて磁束密度を検出する磁界検出素子を備えるものがあった。
【0003】
この磁界検出器は磁界遮蔽部材が外乱磁界を遮蔽して指向性を持たせられる。この磁界検出器が非接触型の電流センサとして用いられる場合、磁界遮蔽部材が電線の近傍にセットされ、磁界検出素子の出力電圧値から電線に流れる電流値が検出される。
【0004】
【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界検出器にあっては、磁界検出素子を筒状の磁界遮蔽部材の中心部に精度良く配置することが難しく、複雑な治具を用い、多くの工数を要するという問題点があった。
【0005】
本発明は上記の問題点に鑑みてなされたものであり、磁界遮蔽部材に対する磁界検出素子の取付精度を容易に高められる磁界検出器を提供することを目的とする。
【0006】
【課題を解決するための手段】
第1の発明は、筒状の磁界遮蔽部材を磁性材によって形成し、この磁界遮蔽部材の内側に配置されて磁束密度を検出する磁界検出素子を備える磁界検出器に適用する。
【0007】
そして、磁界遮蔽部材の中心部に磁界検出素子を支持する治具を非磁性材によって形成し、磁界遮蔽部材の内側に樹脂を充填して磁界検出素子を治具とともに固着し、磁界検出素子を通る磁束が生じる磁界検出素子を通る磁束を生じる自己診断用コイルを備え、治具に自己診断用コイルが収められる凹部を形成したことを特徴とするものとした。
【0009】
の発明は、第の発明において、治具は磁界遮蔽部材の内周面に嵌合する筒部と、磁界遮蔽部材の端面に当接するフランジ部と、磁界遮蔽部材の中心部に位置する底部と、この底部の端面に磁界検出素子及びそのリード線に沿って窪む凹部とを有したことを特徴とするものとした。
【0010】
【発明の作用および効果】
第1の発明によると、磁界遮蔽部材に対して磁界検出素子は、治具を介して位置決めされ、かつ治具とともに樹脂を介して固着される構造のため、磁界検出素子を磁界遮蔽部材の中心部に精度良く取付けられる。磁界遮蔽部材に磁界検出素子を取付けるのに際して、複雑な治具を用いる必要がなく、工数を削減して生産性を高められる。
【0011】
磁界遮蔽部材に対する磁界検出素子の位置決め精度を高めることにより、磁界遮蔽部材が外乱磁界を有効に遮蔽して、磁界検出器の指向性を高められる。
【0012】
そして、自己診断用コイルは治具を介して磁界検出素子に対する位置決めが行われるため、磁界検出器の自己診断精度を高められる。
【0013】
の発明によると、磁界検出素子及びそのリード線が治具の凹部にはめ込まれることにより、磁界遮蔽部材に対する磁界検出素子の位置決めが精度良く行われる。
【0014】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基づいて説明する。
【0015】
図1に示すように、磁界検出器1は、例えば非接触型の電流センサに用いられるものであり、円筒状の磁性材からなる磁界遮蔽部材2と、この磁界遮蔽部材2の内側に配置されて磁界遮蔽部材2の内側を通る磁束密度を検出する磁界検出素子3と、自己診断時に磁界検出素子を通る磁束を生じる自己診断用コイル4とを備える。
【0016】
磁界遮蔽部材2は、例えばパーマロイ、フェライト等の磁性材を材質として直円筒状に形成される。磁界遮蔽部材2は、外乱磁界を遮蔽し、その軸方向に沿った磁束のみを通過させる働きをする。
【0017】
磁界検出素子3は例えばホール素子が用いられる。磁界検出素子3はリード線6を介して通電され、その出力電圧値がこれを通過する磁束密度に応じて変化する。
【0018】
磁界検出器1は、磁界遮蔽部材2の中心部に磁界検出素子3を支持する治具5を備え、磁界遮蔽部材2の内側に樹脂7を充填し、この樹脂7を介して磁界遮蔽部材2に磁界検出素子3を治具5とともに固着する。
【0019】
治具5は非磁性材によって形成され、磁界遮蔽部材2を通過する磁束を遮蔽しないものとする。
【0020】
図2の(a),(b)に示すように、治具5は磁界遮蔽部材2の内周面に嵌合する筒部11と、磁界遮蔽部材2の端面に当接するフランジ部12と、磁界遮蔽部材2の中心部に位置する底部13と、底部13の端面に磁界検出素子3及びリード線6に沿って窪む凹部14とを有し、これらが樹脂を材質として一体形成される。磁界検出素子3及びリード線6が凹部14にはめ込まれることにより、磁界遮蔽部材2に対する磁界検出素子3の位置決めが精度良く行われる。
【0021】
治具5は筒部11の内側に自己診断用コイル4に沿って窪む凹部15とを有し、自己診断用コイル4が凹部15に収められる。治具5と自己診断用コイル4の間に樹脂8を充填し、この樹脂8を介して治具5に自己診断用コイル4を固着する。
【0022】
自己診断用コイル4は円筒状の巻芯21と、この巻芯21に線材が巻回されたコイル22と、このコイル22の両端から延びるリード線23とを備える。巻芯21が治具5の筒部11と同心上に配置される。
【0023】
以上のように構成されて、非接触型の電流センサに用いられる磁界検出器1は磁界遮蔽部材2が電線(図示せず)の近傍にセットされ、磁界検出素子3の出力電圧値から電線に流れる電流値が検出される。
【0024】
磁界遮蔽部材2に対して磁界検出素子3は、治具5を介して位置決めされ、かつ治具5とともに樹脂7を介して固着される構造のため、磁界検出素子3を磁界遮蔽部材2の中心部に精度良く取付けられる。磁界遮蔽部材2に磁界検出素子3を取付けるのに際して、複雑な治具を用いる必要がなく、工数を削減して生産性を高められる。
【0025】
なお、治具5は磁界遮蔽部材2内に残されるが、非磁性材によって形成されているため、磁界検出素子3に導かれる磁束を遮ることがなく、微小電流の検出が可能である。
【0026】
磁界遮蔽部材2に対する磁界検出素子3の位置決め精度を高めることにより、磁界遮蔽部材2が外乱磁界を有効に遮蔽して、磁界検出器1の指向性を高められる。
【0027】
磁界検出器1の自己診断時、自己診断用コイル4に所定の電流を流して、磁界検出素子3を通過する所定の磁束を生じさせる。この状態で磁界検出素子3の出力電圧値を読み込み、これを予め設定された基準値と比較することにより、磁界検出器1が正常に作動しているか否かが診断される。
【0028】
自己診断用コイル4は治具5を介して磁界検出素子3に対する位置決めが行われるため、磁界検出器1の自己診断精度を高められる。
【0029】
なお、磁界検出素子3はホール素子に限らずコイル等を用いても良い。
【0030】
また、磁界検出器1は電流センサに限らず、永久磁石等と組み合わせた変位センサに用いても良い。
【0031】
本発明は上記の実施の形態に限定されずに、その技術的な思想の範囲内において種々の変更がなしうることは明白である。
【図面の簡単な説明】
【図1】本発明の実施の形態を示す磁界検出器の断面図。
【図2】同じく(a)は治具の正面図、(b)は治具及び磁界検出素子の側面図。
【符号の説明】
1 磁界検出器
2 磁界遮蔽部材
3 磁界検出素子
4 自己診断用コイル
5 治具
7,8 樹脂
11 筒部
12 フランジ部
13 底部
15 凹部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a magnetic field detector used for a non-contact type current sensor or the like.
[0002]
[Prior art]
Conventionally, as this type of magnetic field detector, for example, a cylindrical magnetic field shielding member is formed of a magnetic material and is provided with a magnetic field detection element that is disposed inside the magnetic field shielding member and detects a magnetic flux density.
[0003]
In this magnetic field detector, the magnetic field shielding member shields the disturbance magnetic field and has directivity. When this magnetic field detector is used as a non-contact type current sensor, the magnetic field shielding member is set in the vicinity of the electric wire, and the current value flowing through the electric wire is detected from the output voltage value of the magnetic field detection element.
[0004]
[Problems to be solved by the invention]
However, in such a conventional magnetic field detector, it is difficult to accurately place the magnetic field detection element at the center of the cylindrical magnetic field shielding member, which requires a lot of man-hours using a complicated jig. There was a problem.
[0005]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a magnetic field detector that can easily increase the accuracy of attaching a magnetic field detection element to a magnetic field shielding member.
[0006]
[Means for Solving the Problems]
The first invention is applied to a magnetic field detector having a cylindrical magnetic field shielding member formed of a magnetic material and provided with a magnetic field detection element that is disposed inside the magnetic field shielding member and detects a magnetic flux density.
[0007]
Then, the jig for supporting the magnetic field detection element in the center of the magnetic field shielding member formed of a nonmagnetic material, the magnetic field detecting element fixed with jig by filling a resin inside of the magnetic field shielding member, the magnetic field detection element A self-diagnosis coil that generates a magnetic flux that passes through a magnetic field detection element that generates a magnetic flux that passes through is provided, and a concave portion that accommodates the self-diagnosis coil is formed in a jig .
[0009]
According to a second invention, in the first invention, the jig is positioned at a cylindrical portion fitted to the inner peripheral surface of the magnetic field shielding member, a flange portion that contacts the end surface of the magnetic field shielding member, and a central portion of the magnetic field shielding member. And a concave portion that is recessed along the lead wire on the end face of the bottom portion.
[0010]
Operation and effect of the invention
According to the first invention, the magnetic field detecting element is positioned with respect to the magnetic field shielding member via the jig and fixed together with the jig via the resin, so that the magnetic field detecting element is positioned at the center of the magnetic field shielding member. It can be attached to the part with high accuracy. When attaching the magnetic field detection element to the magnetic field shielding member, it is not necessary to use a complicated jig, and man-hours can be reduced to increase productivity.
[0011]
By increasing the positioning accuracy of the magnetic field detection element with respect to the magnetic field shielding member, the magnetic field shielding member effectively shields the disturbance magnetic field, and the directivity of the magnetic field detector can be enhanced.
[0012]
Since the self-diagnosis coil is positioned with respect to the magnetic field detection element via the jig, the self-diagnosis accuracy of the magnetic field detector can be improved.
[0013]
According to the second invention, the magnetic field detection element and its lead wire are fitted into the recess of the jig, so that the magnetic field detection element is accurately positioned with respect to the magnetic field shielding member.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0015]
As shown in FIG. 1, the magnetic field detector 1 is used for, for example, a non-contact type current sensor, and is disposed inside the magnetic field shielding member 2 made of a cylindrical magnetic material. A magnetic field detecting element 3 for detecting a magnetic flux density passing through the inside of the magnetic field shielding member 2 and a self-diagnosis coil 4 for generating a magnetic flux passing through the magnetic field detecting element during self-diagnosis.
[0016]
The magnetic field shielding member 2 is formed in a right cylindrical shape using a magnetic material such as permalloy or ferrite, for example. The magnetic field shielding member 2 functions to shield the disturbance magnetic field and allow only the magnetic flux along the axial direction to pass therethrough.
[0017]
As the magnetic field detection element 3, for example, a Hall element is used. The magnetic field detection element 3 is energized via the lead wire 6 and its output voltage value changes in accordance with the magnetic flux density passing through it.
[0018]
The magnetic field detector 1 includes a jig 5 that supports the magnetic field detection element 3 at the center of the magnetic field shielding member 2, and a resin 7 is filled inside the magnetic field shielding member 2, and the magnetic field shielding member 2 is interposed via the resin 7. The magnetic field detection element 3 is fixed together with the jig 5.
[0019]
The jig 5 is formed of a non-magnetic material and does not shield magnetic flux passing through the magnetic field shielding member 2.
[0020]
As shown in FIGS. 2A and 2B, the jig 5 includes a cylindrical portion 11 that is fitted to the inner peripheral surface of the magnetic field shielding member 2, a flange portion 12 that is in contact with the end surface of the magnetic field shielding member 2, and A bottom portion 13 located at the center of the magnetic field shielding member 2 and a recess 14 recessed along the magnetic field detection element 3 and the lead wire 6 on the end surface of the bottom portion 13 are integrally formed of resin. By positioning the magnetic field detection element 3 and the lead wire 6 in the recess 14, the magnetic field detection element 3 is accurately positioned with respect to the magnetic field shielding member 2.
[0021]
The jig 5 has a concave portion 15 that is recessed along the self-diagnosis coil 4 inside the cylindrical portion 11, and the self-diagnosis coil 4 is accommodated in the concave portion 15. A resin 8 is filled between the jig 5 and the self-diagnosis coil 4, and the self-diagnosis coil 4 is fixed to the jig 5 through the resin 8.
[0022]
The self-diagnosis coil 4 includes a cylindrical winding core 21, a coil 22 in which a wire is wound around the winding core 21, and lead wires 23 extending from both ends of the coil 22. The winding core 21 is disposed concentrically with the cylindrical portion 11 of the jig 5.
[0023]
In the magnetic field detector 1 configured as described above and used in a non-contact type current sensor, the magnetic field shielding member 2 is set in the vicinity of the electric wire (not shown), and the electric field is output from the output voltage value of the magnetic field detecting element 3. A flowing current value is detected.
[0024]
The magnetic field detection element 3 is positioned with respect to the magnetic field shielding member 2 through the jig 5 and fixed together with the jig 5 through the resin 7. It can be attached to the part with high accuracy. When attaching the magnetic field detecting element 3 to the magnetic field shielding member 2, it is not necessary to use a complicated jig, and the man-hours can be reduced to increase the productivity.
[0025]
Although the jig 5 is left in the magnetic field shielding member 2, it is formed of a nonmagnetic material, so that the magnetic flux guided to the magnetic field detection element 3 is not obstructed and a minute current can be detected.
[0026]
By increasing the positioning accuracy of the magnetic field detecting element 3 with respect to the magnetic field shielding member 2, the magnetic field shielding member 2 can effectively shield the disturbance magnetic field, and the directivity of the magnetic field detector 1 can be enhanced.
[0027]
During self-diagnosis of the magnetic field detector 1, a predetermined current is passed through the self-diagnosis coil 4 to generate a predetermined magnetic flux that passes through the magnetic field detection element 3. In this state, the output voltage value of the magnetic field detection element 3 is read and compared with a preset reference value, thereby diagnosing whether or not the magnetic field detector 1 is operating normally.
[0028]
Since the self-diagnosis coil 4 is positioned with respect to the magnetic field detection element 3 via the jig 5, the self-diagnosis accuracy of the magnetic field detector 1 can be improved.
[0029]
The magnetic field detection element 3 is not limited to a Hall element, and a coil or the like may be used.
[0030]
The magnetic field detector 1 is not limited to a current sensor, and may be used for a displacement sensor combined with a permanent magnet or the like.
[0031]
The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a magnetic field detector showing an embodiment of the present invention.
2A is a front view of a jig, and FIG. 2B is a side view of the jig and a magnetic field detection element.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnetic field detector 2 Magnetic field shielding member 3 Magnetic field detection element 4 Self-diagnosis coil 5 Jigs 7, 8 Resin 11 Tube part 12 Flange part 13 Bottom part 15 Recess

Claims (2)

筒状の磁界遮蔽部材を磁性材によって形成し、
この磁界遮蔽部材の内側に配置されて磁束密度を検出する磁界検出素子を備える磁界検出器において、
前記磁界遮蔽部材の中心部に前記磁界検出素子を支持する治具を非磁性材によって形成し、
磁界遮蔽部材の内側に樹脂を充填して磁界検出素子を前記治具とともに固着し、
前記磁界検出素子を通る磁束が生じる自己診断用コイルを備え、
前記治具にこの自己診断用コイルが収められる凹部を形成したことを特徴とする磁界検出器。
A cylindrical magnetic shielding member is formed of a magnetic material,
In a magnetic field detector including a magnetic field detection element that is disposed inside the magnetic field shielding member and detects a magnetic flux density,
A jig for supporting the magnetic field detection element in the center of the magnetic field shielding member formed of a nonmagnetic material,
Filling the inside of the magnetic shielding member with resin and fixing the magnetic field detection element together with the jig,
A self-diagnosis coil that generates magnetic flux passing through the magnetic field detection element;
A magnetic field detector characterized in that a recess for accommodating the self-diagnosis coil is formed in the jig .
前記治具は前記磁界遮蔽部材の内周面に嵌合する筒部と、磁界遮蔽部材の端面に当接するフランジ部と、磁界遮蔽部材の中心部に位置する底部と、この底部の端面に磁界検出素子及びそのリード線に沿って窪む凹部とを有したことを特徴とする請求項に記載の磁界検出器。The jig includes a cylindrical portion that is fitted to the inner peripheral surface of the magnetic field shielding member, a flange portion that is in contact with an end surface of the magnetic field shielding member, a bottom portion that is positioned at the center of the magnetic field shielding member, and a magnetic field that is applied to the end surface of the bottom portion. The magnetic field detector according to claim 1 , further comprising a detection element and a concave portion that is recessed along a lead wire thereof.
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US20220196763A1 (en) * 2013-07-19 2022-06-23 Allegro Microsystems, Llc Method and apparatus for magnetic sensor producing a changing magnetic field
US12061246B2 (en) * 2013-07-19 2024-08-13 Allegro Microsystems, Llc Method and apparatus for magnetic sensor producing a changing magnetic field

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