JP2018124169A - Temperature detection device - Google Patents

Temperature detection device Download PDF

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JP2018124169A
JP2018124169A JP2017016255A JP2017016255A JP2018124169A JP 2018124169 A JP2018124169 A JP 2018124169A JP 2017016255 A JP2017016255 A JP 2017016255A JP 2017016255 A JP2017016255 A JP 2017016255A JP 2018124169 A JP2018124169 A JP 2018124169A
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temperature
magnetic
magnetic field
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magnetic body
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小林 浩
Hiroshi Kobayashi
浩 小林
徹雄 波多
Tetsuo Hata
徹雄 波多
健太郎 潮田
Kentaro Ushioda
健太郎 潮田
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TDK Corp
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TDK Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a temperature detection device that can improve the accuracy in temperature detection even in an environment where the relative position of a temperature sensitive magnetic substance cannot be accurately fixed.SOLUTION: A temperature detection device 1 comprises: magnetic field generation means 10; a temperature sensitive magnetic substance 13; a magnetic sensor 15; and an operation part 20. The magnetic field generation means 10 and magnetic sensor 15 are located inside an outer edge of the temperature sensitive magnetic substance 13 or its distribution range when seen from a Y-direction. The operation part 20 stores in advance, as a table, an output voltage from the magnetic sensor 15 that is specified by the temperature of the temperature sensitive magnetic substance 13, and detects (specifies) the temperature of the temperature sensitive magnetic substance 13, that is, the temperature of an object to be detected 5 on the basis of the output voltage from the magnetic sensor 15.SELECTED DRAWING: Figure 1

Description

本発明は、感温磁性体を利用した温度検出装置に関する。   The present invention relates to a temperature detection device using a temperature-sensitive magnetic material.

温度をワイヤレスで検出する温度検出装置として、任意のキュリー点を有する感温磁性体を被計測部に配置するとともに、被計測部から離れた場所に設置された磁場発生源から磁場を発生させ、感温磁性体の温度に依存する、磁場の磁束ベクトルの変化を、磁気センサで検出することによって、被計測部の温度を計測するものが知られている。   As a temperature detection device that detects temperature wirelessly, a temperature-sensitive magnetic body having an arbitrary Curie point is arranged in the measurement target part, and a magnetic field is generated from a magnetic field generation source installed at a location away from the measurement target part. A device that measures the temperature of a measurement target part by detecting a change in a magnetic flux vector of a magnetic field, which depends on the temperature of a temperature-sensitive magnetic body, with a magnetic sensor is known.

特許5263894号公報Japanese Patent No. 5263894

特許文献1の構成において、磁気センサの検出する磁束ベクトルは、被計測部の温度変化により変化するが、磁場発生源と磁気センサに対する感温磁性体の相対位置の変化によっても変化する。そのため、感温磁性体の相対位置を高精度に固定できないと、正確な温度測定ができないという課題があった。   In the configuration of Patent Document 1, the magnetic flux vector detected by the magnetic sensor changes due to a temperature change of the measurement target part, but also changes due to a change in the relative position of the temperature-sensitive magnetic body with respect to the magnetic field generation source and the magnetic sensor. For this reason, there has been a problem that accurate temperature measurement cannot be performed unless the relative position of the temperature-sensitive magnetic body can be fixed with high accuracy.

本発明はこうした状況を認識してなされたものであり、その目的は、感温磁性体の相対位置を高精度に固定できない環境においても温度測定の正確性を向上させることの可能な温度検出装置を提供することにある。   The present invention has been made in view of such a situation, and an object of the present invention is to provide a temperature detection device capable of improving the accuracy of temperature measurement even in an environment where the relative position of the temperature-sensitive magnetic body cannot be fixed with high accuracy. Is to provide.

本発明のある態様は、温度検出装置である。この温度検出装置は、
磁場発生手段と、感温磁性体と、磁気センサと、を備え、前記磁気センサによる磁場測定値を基に、前記感温磁性体の位置における温度を検出する、温度検出装置であり、
前記磁場発生手段及び前記磁気センサはそれぞれ、所定方向から見た場合に、前記感温磁性体又はその分布範囲の外縁の内側に位置する。
One embodiment of the present invention is a temperature detection device. This temperature detector is
A temperature detection device comprising a magnetic field generation means, a temperature-sensitive magnetic body, and a magnetic sensor, and detects a temperature at the position of the temperature-sensitive magnetic body based on a magnetic field measurement value by the magnetic sensor,
Each of the magnetic field generating means and the magnetic sensor is located inside the outer edge of the temperature-sensitive magnetic body or its distribution range when viewed from a predetermined direction.

前記感温磁性体は、シート状もしくは板状であり、又は、粉体であって検出対象物内の所定範囲に分布するように前記検出対象物に混ぜられていてもよい。   The temperature-sensitive magnetic body may be in the form of a sheet or a plate, or may be mixed with the detection target so as to be distributed in a predetermined range within the detection target.

前記感温磁性体は、前記磁場発生手段及び前記磁気センサに対して相対移動する検出対象物に設けられ、
前記検出対象物の相対位置に関わらず、前記磁場発生手段及び前記磁気センサはそれぞれ、前記所定方向から見た場合に、前記感温磁性体又はその分布範囲の外縁の内側に位置してもよい。
The temperature-sensitive magnetic body is provided on a detection object that moves relative to the magnetic field generating means and the magnetic sensor,
Regardless of the relative position of the detection object, each of the magnetic field generating means and the magnetic sensor may be located inside the outer edge of the temperature-sensitive magnetic body or its distribution range when viewed from the predetermined direction. .

前記所定方向から見た場合の、前記感温磁性体又はその分布範囲の外縁で囲まれた領域の面積が、前記磁場発生手段の磁場発生部の面積、又は前記磁気センサの磁気検出部の面積、の10倍以上であってもよい。   When viewed from the predetermined direction, the area of the temperature-sensitive magnetic body or the region surrounded by the outer edge of the distribution range is the area of the magnetic field generation unit of the magnetic field generation unit or the area of the magnetic detection unit of the magnetic sensor 10 times or more.

前記磁気センサは、前記感温磁性体に対して、前記磁場発生手段と同一側に配置されていてもよい。   The magnetic sensor may be disposed on the same side as the magnetic field generating unit with respect to the temperature-sensitive magnetic body.

前記感温磁性体は、感温フェライトであってもよい。   The temperature sensitive magnetic material may be a temperature sensitive ferrite.

前記磁場発生手段は、コイルであってもよい。   The magnetic field generating means may be a coil.

前記磁場発生手段の発生する磁場は、交流であってもよい。   The magnetic field generated by the magnetic field generating means may be an alternating current.

なお、以上の構成要素の任意の組合せ、本発明の表現を方法やシステムなどの間で変換したものもまた、本発明の態様として有効である。   It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

本発明によれば、感温磁性体の相対位置を高精度に固定できない環境においても温度測定の正確性を向上させることの可能な温度検出装置を提供することができる。   According to the present invention, it is possible to provide a temperature detection device capable of improving the accuracy of temperature measurement even in an environment where the relative position of the temperature-sensitive magnetic body cannot be fixed with high accuracy.

本発明の実施の形態1に係る温度検出装置1の概略構成図。1 is a schematic configuration diagram of a temperature detection device 1 according to Embodiment 1 of the present invention. −Y方向から見た温度検出装置1の概略構成図。The schematic block diagram of the temperature detection apparatus 1 seen from -Y direction. 図1の感温磁性体13の温度と比透磁率μiとの関係(温度特性)の一例を示すグラフ。The graph which shows an example of the relationship (temperature characteristic) of the temperature of the temperature-sensitive magnetic body 13 of FIG. 1, and relative permeability (mu) i. 図6のシミュレーション結果の前提となる、磁場発生手段10、感温磁性体13、及び磁気センサ15、の第1配置説明図。FIG. 7 is a first arrangement explanatory view of the magnetic field generation means 10, the temperature-sensitive magnetic body 13, and the magnetic sensor 15 which are the premise of the simulation result of FIG. 同、第2配置説明図。The 2nd arrangement explanatory view same as the above. 図4及び図5の配置における、感温磁性体13の温度と磁気センサ15の出力電圧との関係を示すグラフ。6 is a graph showing the relationship between the temperature of the temperature-sensitive magnetic body 13 and the output voltage of the magnetic sensor 15 in the arrangement of FIGS. 4 and 5. 本発明の実施の形態2に係る温度検出装置2の概略構成図。The schematic block diagram of the temperature detection apparatus 2 which concerns on Embodiment 2 of this invention.

以下、図面を参照しながら本発明の好適な実施の形態を詳述する。なお、各図面に示される同一または同等の構成要素、部材等には同一の符号を付し、適宜重複した説明は省略する。また、実施の形態は発明を限定するものではなく例示であり、実施の形態に記述されるすべての特徴やその組み合わせは必ずしも発明の本質的なものであるとは限らない。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(実施の形態1)
図1は、本発明の実施の形態1に係る温度検出装置1の概略構成図である。図1において、直交3軸であるXYZ軸を定義する。図2は、−Y方向から見た温度検出装置1の概略構成図である。図2において、検出対象物5及び演算部20の図示は省略している。温度検出装置1は、磁場発生手段10、感温磁性体13、磁気センサ15、及び演算部20、を備える。磁場発生手段10は、ここでは電磁石(コイル)である。なお、図1において、磁場発生手段10への通電回路の図示は省略している。
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a temperature detection device 1 according to Embodiment 1 of the present invention. In FIG. 1, XYZ axes that are three orthogonal axes are defined. FIG. 2 is a schematic configuration diagram of the temperature detection device 1 viewed from the −Y direction. In FIG. 2, the detection object 5 and the calculation unit 20 are not shown. The temperature detection device 1 includes a magnetic field generation unit 10, a temperature-sensitive magnetic body 13, a magnetic sensor 15, and a calculation unit 20. Here, the magnetic field generating means 10 is an electromagnet (coil). In FIG. 1, an energization circuit for the magnetic field generation means 10 is not shown.

感温磁性体13は、例えば感温フェライトであり、検出対象物(被検出部)5の内部に設けられる。例えば、感温磁性体13は、シート状もしくは板状であって、図1に示すように検出対象物5内に埋設(例えば一体成形)されてもよいし、検出対象物5の表面に露出するように検出対象物5に固定されてもよい。あるいは、感温磁性体13は、粉体であって、検出対象物5内の図1に示す範囲に均一に分布するように検出対象物5に混ぜられていてもよいし、検出対象物5内の全体に均一に分布するように混ぜられていてもよい。なお、感温磁性体13が粉体である場合の分布は、温度検出精度の点で均一であることが好ましいが、不均一な部分が存在してもよい。検出対象物5は、樹脂やゴムのような変形するものであってもよいし、油などの液体であってもよいし、磁場発生手段10及び各磁気センサのいずれか又は両方と壁部によって仕切られた(隔てられた)空間であってもよい。また、検出対象物5は、磁場発生手段10及び磁気センサ15に対して相対移動する移動体であってもよい。   The temperature-sensitive magnetic body 13 is, for example, a temperature-sensitive ferrite, and is provided inside the detection target (detected portion) 5. For example, the temperature-sensitive magnetic body 13 has a sheet shape or a plate shape, and may be embedded (for example, integrally formed) in the detection object 5 as illustrated in FIG. 1 or exposed to the surface of the detection object 5. It may be fixed to the detection object 5 as shown. Alternatively, the temperature-sensitive magnetic body 13 is a powder and may be mixed in the detection target 5 so as to be uniformly distributed in the range shown in FIG. It may be mixed so that it is uniformly distributed throughout. The distribution in the case where the temperature-sensitive magnetic body 13 is powder is preferably uniform in terms of temperature detection accuracy, but there may be non-uniform portions. The detection object 5 may be a deformable material such as resin or rubber, or may be a liquid such as oil, or may be one or both of the magnetic field generation means 10 and each magnetic sensor and a wall. It may be a partitioned (separated) space. Further, the detection object 5 may be a moving body that moves relative to the magnetic field generation means 10 and the magnetic sensor 15.

図3は、感温磁性体13の温度と比透磁率μiとの関係(温度特性)の一例を示すグラフである。図3に示す温度特性は、周波数が1kHzで振幅が0.4A/mの磁場を印加した場合のものである。図3に示す温度特性では、横軸の温度Tが210℃〜230℃の範囲において、温度上昇に伴い比透磁率μiが急激に低下しており、感温磁性体13は、当該温度範囲の温度検出に好適に利用することができる。ここで、温度上昇に伴い比透磁率μiが急激に低下する温度範囲は、感温磁性体13の材質によって様々であり、検出対象とする温度範囲に応じて感温磁性体13の材質を選定すればよい。また、感温磁性体13は、温度上昇に伴い比透磁率μiが緩やかに上昇する温度範囲(図3の例では200℃以下の温度範囲)の温度検出にも利用可能である。   FIG. 3 is a graph showing an example of the relationship (temperature characteristic) between the temperature of the temperature-sensitive magnetic body 13 and the relative permeability μi. The temperature characteristics shown in FIG. 3 are obtained when a magnetic field having a frequency of 1 kHz and an amplitude of 0.4 A / m is applied. In the temperature characteristics shown in FIG. 3, the relative magnetic permeability μi rapidly decreases as the temperature rises when the temperature T on the horizontal axis is in the range of 210 ° C. to 230 ° C. It can be suitably used for temperature detection. Here, the temperature range in which the relative permeability μi rapidly decreases as the temperature rises varies depending on the material of the temperature-sensitive magnetic body 13, and the material of the temperature-sensitive magnetic body 13 is selected according to the temperature range to be detected. do it. The temperature-sensitive magnetic body 13 can also be used for temperature detection in a temperature range in which the relative permeability μi gradually increases as the temperature rises (temperature range of 200 ° C. or lower in the example of FIG. 3).

磁気センサ15は、所定方向(ここではY方向)の磁束密度の大きさ(スカラー値)を測定(検出)するものであり、検出対象物5を挟んで磁場発生手段10の反対側に設けられる。図2に示すように、磁場発生手段10及び磁気センサ15はそれぞれ、Y方向から見た場合に、感温磁性体13又はその分布範囲の外縁の内側に位置する。Y方向から見た場合における、感温磁性体13又はその分布範囲の外縁で囲まれた領域の面積は、磁場発生手段10の磁場発生部(磁極面)の面積、又は磁気センサ15の磁気検出部(感磁面)の面積(好ましくは両者の面積のうち大きい方の面積)の10倍以上であるとよい。なお、磁場発生手段10がコイルの場合、磁極面はコイルの端面を意味する。検出対象物5が移動体である場合、検出対象物5の相対位置に関わらず、磁場発生手段10及び磁気センサ15はそれぞれ、Y方向から見た場合に、感温磁性体13又はその分布範囲の外縁の内側に位置するとよい。また、検出対象物5の相対位置に関わらず、Y方向から見た場合の感温磁性体13又はその分布範囲の外縁で囲まれた領域の面積は、同方向から見た磁場発生手段10又は磁気センサ15の面積の10倍以上であるとよい。   The magnetic sensor 15 measures (detects) the magnitude (scalar value) of the magnetic flux density in a predetermined direction (here, the Y direction), and is provided on the opposite side of the magnetic field generation means 10 with the detection target 5 interposed therebetween. . As shown in FIG. 2, each of the magnetic field generating means 10 and the magnetic sensor 15 is located inside the outer edge of the temperature-sensitive magnetic body 13 or its distribution range when viewed from the Y direction. When viewed from the Y direction, the area of the temperature-sensitive magnetic body 13 or the region surrounded by the outer edge of the distribution range is the area of the magnetic field generating portion (magnetic pole surface) of the magnetic field generating means 10 or the magnetic detection of the magnetic sensor 15. It is good that it is 10 times or more of the area (preferably the larger area of both areas) of the part (magnetic sensitive surface). When the magnetic field generating means 10 is a coil, the magnetic pole surface means the end surface of the coil. When the detection target 5 is a moving body, the magnetic field generating means 10 and the magnetic sensor 15 are each the temperature-sensitive magnetic body 13 or its distribution range when viewed from the Y direction, regardless of the relative position of the detection target 5. It is good to be located inside the outer edge. Regardless of the relative position of the detection object 5, the area of the temperature-sensitive magnetic body 13 or the region surrounded by the outer edge of the distribution range when viewed from the Y direction is equal to the magnetic field generating means 10 viewed from the same direction. The area of the magnetic sensor 15 is preferably 10 times or more.

演算部20は、感温磁性体13の温度によって特定される、磁気センサ15の出力電圧を、予めテーブルとして記憶しており、磁気センサ15の出力電圧を基に、感温磁性体13の温度、すなわち検出対象物5の温度を検出(特定)する。ここで、感温磁性体13が磁場発生手段10及び磁気センサ15に対して小さい場合を仮定すると、磁気センサ15の出力電圧は、感温磁性体13の温度変化(検出対象物5の温度変化)によって変化するが、磁場発生手段10及び磁気センサ15に対する感温磁性体13の相対位置の変化によっても変化する。そのため、感温磁性体13の位置が振動等により変動する環境下では、磁気センサ15の出力電圧の変化が、感温磁性体13の温度変化によるものなのか、感温磁性体13の相対位置の変化によるものなのか、を特定することができず、結果として感温磁性体13の温度検出(検出対象物5の温度検出)ができない。これに対し本実施の形態では、感温磁性体13をシート状もしくは板状とすることで、又は感温磁性体13を粉体として検出対象物5内に広く(磁場発生手段10又は磁気センサ15の正射影面積よりも十分に広く)分布させることで、感温磁性体13の相対位置の変化による磁気センサ15の出力電圧の変化を低減し又は無くしているため、感温磁性体13の相対位置が変化する場合であっても、演算部20は、単一の磁気センサ15の出力電圧により検出対象物5の温度を検出できる。   The computing unit 20 stores in advance the output voltage of the magnetic sensor 15 specified by the temperature of the temperature-sensitive magnetic body 13 as a table, and the temperature of the temperature-sensitive magnetic body 13 is based on the output voltage of the magnetic sensor 15. That is, the temperature of the detection object 5 is detected (specified). Here, assuming that the temperature-sensitive magnetic body 13 is smaller than the magnetic field generating means 10 and the magnetic sensor 15, the output voltage of the magnetic sensor 15 is the temperature change of the temperature-sensitive magnetic body 13 (the temperature change of the detection target 5. ), But also due to a change in the relative position of the temperature-sensitive magnetic body 13 with respect to the magnetic field generating means 10 and the magnetic sensor 15. Therefore, in an environment where the position of the temperature-sensitive magnetic body 13 varies due to vibration or the like, whether the change in the output voltage of the magnetic sensor 15 is due to the temperature change of the temperature-sensitive magnetic body 13 or the relative position of the temperature-sensitive magnetic body 13. It is not possible to specify whether the temperature is due to the change in temperature, and as a result, temperature detection of the temperature-sensitive magnetic body 13 (temperature detection of the detection object 5) cannot be performed. On the other hand, in the present embodiment, the temperature-sensitive magnetic body 13 is formed into a sheet shape or a plate shape, or the temperature-sensitive magnetic body 13 is widely used as a powder in the detection target 5 (the magnetic field generating means 10 or the magnetic sensor). 15), the change in the output voltage of the magnetic sensor 15 due to the change in the relative position of the temperature-sensitive magnetic body 13 is reduced or eliminated. Even when the relative position changes, the calculation unit 20 can detect the temperature of the detection object 5 by the output voltage of the single magnetic sensor 15.

図4は、図6のシミュレーション結果の前提となる、磁場発生手段10、感温磁性体13、及び磁気センサ15、の第1配置説明図である。図5は、同じく第2配置説明図である。図5は、図4と比較して、感温磁性体13の厚さが15mmから10mmに薄くなっている点で相違し、その他の点で一致する。例えば、図4は、検出対象物5がゴムである場合の成形前に対応し、図5は、成形後に対応する。図5における感温磁性体13の厚み方向中央を、Y=0としている。   FIG. 4 is a first arrangement explanatory view of the magnetic field generating means 10, the temperature-sensitive magnetic body 13, and the magnetic sensor 15, which are the premise of the simulation result of FIG. FIG. 5 is also a second arrangement explanatory view. FIG. 5 is different from FIG. 4 in that the thickness of the temperature-sensitive magnetic body 13 is reduced from 15 mm to 10 mm, and is identical in other points. For example, FIG. 4 corresponds to before molding when the detection object 5 is rubber, and FIG. 5 corresponds to after molding. The center in the thickness direction of the temperature-sensitive magnetic body 13 in FIG.

図6は、図4及び図5の配置における、感温磁性体13の温度と磁気センサ15の出力電圧との関係を示すグラフである。図6に示す特性は、シミュレーションによって導出されたものであり、本シミュレーションでは、周波数が1kHzの磁場を磁気センサ15に印加した。図6中、実線の特性は図4の配置に対応し、破線の特性は図5の配置に対応する。図6に示すように、検出対象物5の成形に伴い感温磁性体13の厚みが2/3まで薄くなっても、磁気センサ15の温度対出力電圧特性には僅かな変化(測定誤差として許容できる範囲の変化)しか現れなかった。また、図5において感温磁性体13をY方向に±1mmずらした場合の各々においても、磁気センサ15の温度対出力電圧特性は、図4の配置と近似するものであった(重ねて描くと区別が困難なため図示省略)。   FIG. 6 is a graph showing the relationship between the temperature of the temperature-sensitive magnetic body 13 and the output voltage of the magnetic sensor 15 in the arrangement of FIGS. 4 and 5. The characteristics shown in FIG. 6 are derived by simulation. In this simulation, a magnetic field having a frequency of 1 kHz was applied to the magnetic sensor 15. In FIG. 6, the solid line characteristic corresponds to the arrangement in FIG. 4, and the broken line characteristic corresponds to the arrangement in FIG. 5. As shown in FIG. 6, even when the thickness of the temperature-sensitive magnetic body 13 is reduced to 2/3 as the detection object 5 is molded, a slight change (as a measurement error) occurs in the temperature-to-output voltage characteristics of the magnetic sensor 15. Only an acceptable range change) appeared. Further, in each of the cases where the temperature-sensitive magnetic body 13 is shifted by ± 1 mm in the Y direction in FIG. 5, the temperature-to-output voltage characteristics of the magnetic sensor 15 are similar to the arrangement of FIG. This is not shown because it is difficult to distinguish.)

本実施の形態によれば、感温磁性体13をシート状もしくは板状とし、又は感温磁性体13を粉体として検出対象物5内に広く分布させているため、感温磁性体13の相対位置が変化する場合であっても、演算部20は、単一の磁気センサ15の出力電圧により検出対象物5の温度を検出できる。換言すれば、感温磁性体13の相対位置を高精度に固定できない環境においても温度検出の正確性を向上させることができる。   According to the present embodiment, the temperature-sensitive magnetic body 13 has a sheet shape or a plate-like shape, or the temperature-sensitive magnetic body 13 is widely distributed in the detection target 5 as a powder. Even when the relative position changes, the calculation unit 20 can detect the temperature of the detection object 5 by the output voltage of the single magnetic sensor 15. In other words, the accuracy of temperature detection can be improved even in an environment where the relative position of the temperature-sensitive magnetic body 13 cannot be fixed with high accuracy.

(実施の形態2)
図7は、本発明の実施の形態2に係る温度検出装置2の概略構成図である。本実施の形態の温度検出装置2は、実施の形態1のものと比較して、磁気センサ15及び演算部20が、検出対象物5に対して磁場発生手段10と同じ側に位置する点で相違し、その他の点で一致する。本実施の形態も、実施の形態1と同様の効果を奏することができる。
(Embodiment 2)
FIG. 7 is a schematic configuration diagram of a temperature detection device 2 according to Embodiment 2 of the present invention. The temperature detection device 2 of the present embodiment is different from that of the first embodiment in that the magnetic sensor 15 and the calculation unit 20 are located on the same side as the magnetic field generation means 10 with respect to the detection target 5. Dissimilar and otherwise consistent. The present embodiment can achieve the same effects as those of the first embodiment.

以上、実施の形態を例に本発明を説明したが、実施の形態の各構成要素や各処理プロセスには請求項に記載の範囲で種々の変形が可能であることは当業者に理解されるところである。以下、変形例について触れる。   The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

磁場発生手段10は、永久磁石であってもよい。この場合、磁場発生手段10が発生する磁場は直流に限定されるが、原理的に温度検出は可能である。感温磁性体13は、フェライトに限定されず、珪素鋼板等の他の磁性体であってもよい。   The magnetic field generating means 10 may be a permanent magnet. In this case, the magnetic field generated by the magnetic field generation means 10 is limited to DC, but in principle, temperature detection is possible. The temperature-sensitive magnetic body 13 is not limited to ferrite but may be other magnetic bodies such as a silicon steel plate.

1,2 温度検出装置、5 検出対象物(被検出部)、10 磁場発生手段、13 感温磁性体、15 磁気センサ、20 演算部 1, 2 Temperature detection device, 5 Object to be detected (detected part), 10 Magnetic field generating means, 13 Temperature-sensitive magnetic body, 15 Magnetic sensor, 20 Calculation part

Claims (8)

磁場発生手段と、感温磁性体と、磁気センサと、を備え、前記磁気センサによる磁場測定値を基に、前記感温磁性体の位置における温度を検出する、温度検出装置であり、
前記磁場発生手段及び前記磁気センサはそれぞれ、所定方向から見た場合に、前記感温磁性体又はその分布範囲の外縁の内側に位置する、温度検出装置。
A temperature detection device comprising a magnetic field generation means, a temperature-sensitive magnetic body, and a magnetic sensor, and detects a temperature at the position of the temperature-sensitive magnetic body based on a magnetic field measurement value by the magnetic sensor,
The temperature detection device, wherein the magnetic field generation unit and the magnetic sensor are each located inside an outer edge of the temperature-sensitive magnetic body or its distribution range when viewed from a predetermined direction.
前記感温磁性体は、シート状もしくは板状であり、又は、粉体であって検出対象物内の所定範囲に分布するように前記検出対象物に混ぜられている、請求項1に記載の温度検出装置。   2. The temperature-sensitive magnetic body according to claim 1, wherein the temperature-sensitive magnetic body has a sheet shape or a plate shape, or is a powder and is mixed with the detection target so as to be distributed in a predetermined range in the detection target. Temperature detection device. 前記感温磁性体は、前記磁場発生手段及び前記磁気センサに対して相対移動する検出対象物に設けられ、
前記検出対象物の相対位置に関わらず、前記磁場発生手段及び前記磁気センサはそれぞれ、前記所定方向から見た場合に、前記感温磁性体又はその分布範囲の外縁の内側に位置する、請求項1又は2に記載の温度検出装置。
The temperature-sensitive magnetic body is provided on a detection object that moves relative to the magnetic field generating means and the magnetic sensor,
The magnetic field generation means and the magnetic sensor are each located inside the outer edge of the temperature-sensitive magnetic body or its distribution range when viewed from the predetermined direction, regardless of the relative position of the detection target. The temperature detection apparatus according to 1 or 2.
前記所定方向から見た場合の、前記感温磁性体又はその分布範囲の外縁で囲まれた領域の面積が、前記磁場発生手段の磁場発生部の面積、又は前記磁気センサの磁気検出部の面積、の10倍以上である、請求項1乃至3のいずれか一項に記載の温度検出装置。   When viewed from the predetermined direction, the area of the temperature-sensitive magnetic body or the region surrounded by the outer edge of the distribution range is the area of the magnetic field generation unit of the magnetic field generation unit or the area of the magnetic detection unit of the magnetic sensor The temperature detection device according to any one of claims 1 to 3, wherein the temperature detection device is 10 times or more of. 前記磁気センサは、前記感温磁性体に対して、前記磁場発生手段と同一側に配置されている、請求項1乃至4のいずれか一項に記載の温度検出装置。   5. The temperature detection device according to claim 1, wherein the magnetic sensor is disposed on the same side as the magnetic field generation unit with respect to the temperature-sensitive magnetic body. 前記感温磁性体は、感温フェライトである、請求項1乃至5のいずれか一項に記載の温度検出装置。   The temperature detection device according to claim 1, wherein the temperature-sensitive magnetic body is a temperature-sensitive ferrite. 前記磁場発生手段は、コイルである、請求項1乃至6のいずれか一項に記載の温度検出装置。   The temperature detection device according to any one of claims 1 to 6, wherein the magnetic field generation means is a coil. 前記磁場発生手段の発生する磁場は、交流である、請求項1乃至7のいずれか一項に記載の温度検出装置。   The temperature detection apparatus according to any one of claims 1 to 7, wherein the magnetic field generated by the magnetic field generation means is alternating current.
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Citations (3)

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JPS58180437U (en) * 1982-05-28 1983-12-02 東北金属工業株式会社 Temperature detection device for rotating body
JPS615438U (en) * 1984-06-15 1986-01-13 株式会社安川電機 Temperature detection device for rotating body
JPH03256086A (en) * 1990-03-06 1991-11-14 Hitachi Metals Ltd Heat fixing device

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Publication number Priority date Publication date Assignee Title
JPS58180437U (en) * 1982-05-28 1983-12-02 東北金属工業株式会社 Temperature detection device for rotating body
JPS615438U (en) * 1984-06-15 1986-01-13 株式会社安川電機 Temperature detection device for rotating body
JPH03256086A (en) * 1990-03-06 1991-11-14 Hitachi Metals Ltd Heat fixing device

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Title
村上孝一: "感温磁性材料とその応用", 電気学会雑誌, JPN6021014745, 8 January 1973 (1973-01-08), pages 110 - 116, ISSN: 0004495251 *

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