JPS61184434A - Torque sensor - Google Patents

Torque sensor

Info

Publication number
JPS61184434A
JPS61184434A JP60024827A JP2482785A JPS61184434A JP S61184434 A JPS61184434 A JP S61184434A JP 60024827 A JP60024827 A JP 60024827A JP 2482785 A JP2482785 A JP 2482785A JP S61184434 A JPS61184434 A JP S61184434A
Authority
JP
Japan
Prior art keywords
soft magnetic
length
coil
yoke
layer
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
JP60024827A
Other languages
Japanese (ja)
Inventor
Hiroyuki Hase
裕之 長谷
Ichiro Yamashita
一郎 山下
Masayuki Wakamiya
若宮　正行
Shinya Tokuotono
徳音野　信哉
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP60024827A priority Critical patent/JPS61184434A/en
Publication of JPS61184434A publication Critical patent/JPS61184434A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/102—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving magnetostrictive means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/105—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving inductive means

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To stabilize output against vibration to a thrust direction, by setting the length of a soft magnetic outer peripheral layer in the torque transmitting axis thereof to 0.8 times or less the length of a surface soft magnetic layer in the same direction. CONSTITUTION:The length l1 of a soft magnetic yoke 4 in the torque transmitting direction thereof is set to 0.8 times or less the length l2 of a surface soft magnetic layer 2 in the same direction. By this method, even if the soft magnetic yoke 4 and the surface soft magnetic layer 2 slightly vibrate relatively, no substantial change is generated in the magnetic circuit containing both of them and output does not vary.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、非晶質磁性合金の応力−磁気効果を応用した
非接触型のトルクセンサに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a non-contact torque sensor that applies the stress-magnetic effect of an amorphous magnetic alloy.

従来の技術 第３図に示すように、回転軸１の表面に磁歪を有する非
晶質磁性合金２を固着し、前記非晶質磁性合金２の外側
に一定空隙を介してコイル３を巻固し、さらにコイル３
の外側に軸１と同心円状に軟磁性体ヨーク４を設けた構
成のトルクセンサが知られている（例えば、特開昭５９
−７７３２６号公報）。第３図において、非晶質磁性合
金２．コイル３．及びヨーク４により磁気回路が構成さ
れ軸１のねじれに伴う非晶質磁性合金２の歪が検出され
る。BACKGROUND ART As shown in FIG. 3, an amorphous magnetic alloy 2 having magnetostriction is fixed on the surface of a rotating shaft 1, and a coil 3 is wound and fixed on the outside of the amorphous magnetic alloy 2 with a certain gap in between. And then coil 3
A torque sensor is known in which a soft magnetic yoke 4 is provided concentrically with the shaft 1 on the outside of the shaft 1 (for example, Japanese Patent Laid-Open No. 59
-77326). In FIG. 3, amorphous magnetic alloy 2. Coil 3. A magnetic circuit is constituted by the yoke 4 and the distortion of the amorphous magnetic alloy 2 caused by the twisting of the shaft 1 is detected.

発明が解決しようとする問題点 このような構成の場合、ヨーク４と非晶質磁性合金２の
軸方向の長さが等しい場合に、機械的な振動の多い環境
で使用した場合、主にヨーク４と非晶質磁性合金２のス
ラスト方向での相対変位により、磁気回路中を通る磁束
が変化し出力の精度が悪くなるという欠点があった。Problems to be Solved by the Invention In this configuration, when the yoke 4 and the amorphous magnetic alloy 2 have the same length in the axial direction, when used in an environment with a lot of mechanical vibration, the yoke mainly Due to the relative displacement of the amorphous magnetic alloy 4 and the amorphous magnetic alloy 2 in the thrust direction, the magnetic flux passing through the magnetic circuit changes, resulting in poor output accuracy.

問題点を解決するための手段 トルクを伝達する軸の外周面上に、円筒形状の磁歪を有
する軟磁性層を固着し、前記軟磁性体層の外側に空隙を
介して同軸状にコイルを巻回配置し、さらにコイルの外
側に同軸状に中空円筒状の軟磁性ヨークを設けた構成を
有し、トルクにより発生するねじれ量が前記の磁歪を有
する軟磁性層の透磁率変化に変換され、これを前記コイ
ルのインダクタンス変化として検出されるよう構成され
たトルクセンサにおいて、前記軟磁性ヨークのトルク伝
達軸方向の長さを、前記表面軟磁性層の同方向の長さの
０．８倍以下に構成する。Means for Solving the Problem A cylindrical magnetostrictive soft magnetic layer is fixed on the outer circumferential surface of a shaft that transmits torque, and a coil is coaxially wound around the outside of the soft magnetic layer with a gap in between. It has a configuration in which a hollow cylindrical soft magnetic yoke is coaxially provided outside the coil, and the amount of twist generated by torque is converted into a change in magnetic permeability of the soft magnetic layer having magnetostriction. In a torque sensor configured to detect this as a change in inductance of the coil, the length of the soft magnetic yoke in the torque transmission axis direction is set to 0.8 times or less of the length of the surface soft magnetic layer in the same direction. Configure.

作　　用 軟磁性ヨークと表面軟磁性層とが多少相対振動しても、
両者を含む磁気回路に実質的な変化が生ぜず、出力は変
動しなくなる。Even if there is some relative vibration between the working soft magnetic yoke and the surface soft magnetic layer,
There is no substantial change in the magnetic circuit that includes both, and the output no longer fluctuates.

実施例 本発明の一実施例を第１図に示す。Example An embodiment of the present invention is shown in FIG.

図中１は回転軸、２は磁歪を有する非晶質合金層、３は
コイル、４は軟磁性ヨークである。軟磁性ヨーク４の軸
方向の長さ４１　は、非晶質合金２の軸方向の長さ１２
の０．６６倍となっている。これにより、軟磁性ヨーク
４等のスラスト方向の振動に対しても安定に出力を得る
事ができる。第２図に、非晶質磁性合金の長さβ２と軟
磁性ヨークの長さ１１の比１１／１２と、スラスト方向
に軟磁性ヨークを一定距離変位させた時のインダクタン
ス変化ΔＬとの関係を示す。１１／１２が０．８以下で
あると、スラスト方向の変動に対して強い事がわかる。In the figure, 1 is a rotating shaft, 2 is an amorphous alloy layer having magnetostriction, 3 is a coil, and 4 is a soft magnetic yoke. The axial length 41 of the soft magnetic yoke 4 is equal to the axial length 12 of the amorphous alloy 2.
It is 0.66 times that of the previous year. This makes it possible to stably obtain an output even when the soft magnetic yoke 4 and the like vibrate in the thrust direction. Figure 2 shows the relationship between the ratio 11/12 of the length β2 of the amorphous magnetic alloy and the length 11 of the soft magnetic yoke and the inductance change ΔL when the soft magnetic yoke is displaced a certain distance in the thrust direction. show. It can be seen that when 11/12 is 0.8 or less, it is strong against fluctuations in the thrust direction.

なお、軸径が２０謹〜３０閣の範囲においてこの傾向は
顕著であった。In addition, this tendency was remarkable in the range of shaft diameters of 20 to 30 mm.

発明の効果 本発明は、軟磁性ヨークの軸方向長さを、表面非晶質磁
性合金層の長さＯ，Ｓ以下とする事によりスラスト方向
への振動に対し出力を安定化する事ができる。Effects of the Invention The present invention makes it possible to stabilize the output against vibrations in the thrust direction by making the axial length of the soft magnetic yoke equal to or less than the length O, S of the surface amorphous magnetic alloy layer. .

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

第１図は本発明の一実施例のトルクセンサの断面図、第
２図は軟磁性ヨーク長さと表面非晶質合金層の長さ比と
スラスト方向振動による出力変動との関係を示すグラフ
、第３図は従来のトルクセンサの構造を示す断面図であ
る。 １・・・・・・回転軸、２・・・・・・非晶質磁性合金
、３・・・・・・コイル、４・・・・・・軟磁性ヨーク
。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図FIG. 1 is a cross-sectional view of a torque sensor according to an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the length of the soft magnetic yoke, the length ratio of the surface amorphous alloy layer, and the output fluctuation due to vibration in the thrust direction. FIG. 3 is a sectional view showing the structure of a conventional torque sensor. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2... Amorphous magnetic alloy, 3... Coil, 4... Soft magnetic yoke. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

【特許請求の範囲】[Claims] トルクを伝達する軸の外周面上に、円筒形状の磁歪を有
する軟磁性体層を固着し、前記軟磁性体層の外側に空隙
を介して同軸状にコイルを巻回配置し、さらにコイルの
外側に同軸状に中空円筒形状の軟磁性ヨークを設けた構
成を有し、トルクにより発生するねじれ量が前記の磁歪
を有する軟磁性層の透磁率変化に変換され、これを前記
コイルのインダクタンス変化として検出されるよう構成
されたトルクセンサにおいて、前記軟磁性外周層のトル
ク伝達軸方向の長さが、前記表面軟磁性層の同方向の長
さの０．８倍以下である事を特徴とするトルクセンサ。A cylindrical magnetostrictive soft magnetic material layer is fixed on the outer circumferential surface of a shaft that transmits torque, a coil is coaxially wound around the outside of the soft magnetic material layer with a gap in between, and the coil is It has a configuration in which a hollow cylindrical soft magnetic yoke is provided coaxially on the outside, and the amount of twist generated by torque is converted into a change in magnetic permeability of the soft magnetic layer having magnetostriction, which is converted into a change in inductance of the coil. In the torque sensor configured to detect as torque sensor.
JP60024827A 1985-02-12 1985-02-12 Torque sensor Pending JPS61184434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60024827A JPS61184434A (en) 1985-02-12 1985-02-12 Torque sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60024827A JPS61184434A (en) 1985-02-12 1985-02-12 Torque sensor

Publications (1)

Publication Number Publication Date
JPS61184434A true JPS61184434A (en) 1986-08-18

Family

ID=12149016

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60024827A Pending JPS61184434A (en) 1985-02-12 1985-02-12 Torque sensor

Country Status (1)

Country Link
JP (1) JPS61184434A (en)

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