JPH03218427A - Magnetostriction type torque sensor - Google Patents
Magnetostriction type torque sensorInfo
- Publication number
- JPH03218427A JPH03218427A JP1455290A JP1455290A JPH03218427A JP H03218427 A JPH03218427 A JP H03218427A JP 1455290 A JP1455290 A JP 1455290A JP 1455290 A JP1455290 A JP 1455290A JP H03218427 A JPH03218427 A JP H03218427A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- yoke member
- torque sensor
- torque
- detection
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 230000005291 magnetic effect Effects 0.000 claims abstract description 46
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 29
- 230000005284 excitation Effects 0.000 claims description 24
- 230000035699 permeability Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 15
- 230000004907 flux Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、トルク伝達軸に印加されるトルクをその軸表
面の磁歪効果を利用し電気量として非接触的に検出する
磁歪式トルクセンサに関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetostrictive torque sensor that non-contactly detects the torque applied to a torque transmission shaft as an electrical quantity by utilizing the magnetostrictive effect of the shaft surface. .
〔従来の技術］
電動機、工作機械、自動車等における回転駆動系のトル
ク伝達軸（以下、ｒ軸体Ｊ）に加わるトルクを検出する
センサとして、軸体の表面に、軸心方向に対し傾斜する
方向を磁化容易軸とする一軸磁気異方性を付与しておき
、その軸体表面に交番磁界を印加し、軸体にトルクが加
わることにより生じる軸体表面の軸心方向の透磁率変化
を電気量として非接触検出するようにした磁歪式トルク
センサが知られている。[Prior art] As a sensor for detecting torque applied to a torque transmission shaft (hereinafter referred to as r-shaft body J) of a rotary drive system in an electric motor, machine tool, automobile, etc., a sensor is used to detect torque applied to a torque transmission shaft (hereinafter referred to as r-shaft body J) in an electric motor, machine tool, automobile, etc. Uniaxial magnetic anisotropy is imparted with the direction as the axis of easy magnetization, and an alternating magnetic field is applied to the surface of the shaft to detect changes in magnetic permeability in the axial direction of the shaft surface caused by applying torque to the shaft. 2. Description of the Related Art Magnetostrictive torque sensors are known that detect electrical quantities in a non-contact manner.
これを第５図により説明すると、（１）は軸体、（１・
１）ば、その軸体表面の一軸磁気異方性が付与されてい
る帯域（以下、「磁気異方性帯域」）である。その一軸
磁気異方性は、軸体の表面に、例えば周方向に略一定間
隔をなす複数条の互いに平行な螺旋溝（溝の傾斜方向が
磁化容易軸となる）を刻設することにより与えられる。To explain this using Fig. 5, (1) is the shaft body, (1.
1) is a zone (hereinafter referred to as "magnetic anisotropy zone") in which uniaxial magnetic anisotropy is imparted to the surface of the shaft body. The uniaxial magnetic anisotropy can be achieved by, for example, carving a plurality of mutually parallel spiral grooves (the direction of inclination of the grooves is the axis of easy magnetization) at approximately constant intervals in the circumferential direction on the surface of the shaft. It will be done.
（１１）は、磁気異方性帯域（１・１）に交番磁界を印
加する巻線（励磁巻線） 、（１２）は磁気異方性帯域
（１・ｌ）表面に生じる透磁率の変化を検出する巻線（
検出巻線）である。(11) is the winding (excitation winding) that applies an alternating magnetic field to the magnetic anisotropy zone (1・1), and (12) is the change in magnetic permeability that occurs on the surface of the magnetic anisotropy zone (1・l). The winding that detects (
detection winding).
励磁巻線（１１）と検出巻線（１２） （以下、「両者
を励磁・検出巻線（１０） Ｊと称することもある）は
、プラスチック等からなる円環状ボビン（２０）の外周
面に同心円状に重合捲装されている。（３０）は、強磁
性体（代表的にはパーマロイ合金）からなるヨーク部材
である。該ヨーク部材（３０）は、軸体挿通孔（以下、
「軸孔Ｊ ） （３４）を有するドーナツ形状の筺体、
すなわち円周板面部（３１）とその両側の側板面部（３
２．３２） とで画成される円周空間を有する部材であ
る。An excitation winding (11) and a detection winding (12) (hereinafter both may be referred to as "excitation/detection winding (10) J") are attached to the outer peripheral surface of an annular bobbin (20) made of plastic or the like. The yoke member (30) is made of a ferromagnetic material (typically permalloy alloy).The yoke member (30) has a shaft insertion hole (hereinafter referred to as
"A donut-shaped casing having a shaft hole J) (34),
That is, the circumferential plate surface portion (31) and the side plate surface portions (3
2.32) It is a member having a circumferential space defined by and.
前記ボビン（２０）に重合捲装された励磁・検出巻線（
１０）は、ヨーク部材（３０）の円周空間内に嵌納され
て、円筒状ハウジング（４０）に装入・固定されたうえ
、ハウジング（４０）の両開口端のラジアル軸受（５０
．５０）を介して軸体（１）の所定個所に回転対称に取
付けられる。その励磁巻線（１１）は高周波電源（図示
せず）に、検出巻線（工２）は、軸体表面の透磁率変化
を電気量として取出す検出回路（図示せず）に、それぞ
れ接続される。なお、図は、軸体（１）の表面の隣り合
う２個所に磁気異方性域（１・１）（１・１）（その磁
化容易軸の軸心方向に対する傾き角度は同一で、向きは
互いに逆である）を形成し、軸体のトルク印加により生
じる２つの磁気異方性域におけるそれぞれの透磁率変化
を差動的に取出すように、２つの励磁・検出巻線（１０
） （１０）をヨーク部材（３０） （３０）のそれぞ
れに嵌納してハウジング（４０）内に装入・固定した差
動型トルクセンサの構成を示している。The excitation/detection winding (
10) is fitted into the circumferential space of the yoke member (30), inserted and fixed into the cylindrical housing (40), and is also fitted with radial bearings (50) at both open ends of the housing (40).
．． 50) at a predetermined location on the shaft body (1) in a rotationally symmetrical manner. The excitation winding (11) is connected to a high frequency power source (not shown), and the detection winding (2) is connected to a detection circuit (not shown) that extracts changes in magnetic permeability on the surface of the shaft body as an electrical quantity. Ru. The figure shows magnetic anisotropy regions (1・1) (1・1) at two adjacent locations on the surface of the shaft body (1) (the inclination angles of the easy magnetization axes with respect to the axial direction are the same, and the directions are mutually different). The two excitation/detection windings (10
) (10) is fitted into each of the yoke members (30) (30) and inserted and fixed into the housing (40).
上記磁歪式トルクセンサのトルク検出感度は、軸体表面
に印加される磁界の磁束（Φ）を大きくすることにより
高められる。磁束（Φ）は、起磁力Ｎ・Ｉ（Ｎ：励磁巻
線の巻数．■：励磁電流）と、磁気抵抗Ｒ（軸体表面、
ヨーク部材、および軸体表面とヨーク部材との間隙Ｇ等
の各部分の抵抗の総和）との関数（Φ＝Ｎ−１／Ｒ）で
あり、起磁力一定の条件下で、磁束（Φ）を大きくする
には、磁気回路の抵抗を小さくすることが必要である。The torque detection sensitivity of the magnetostrictive torque sensor can be increased by increasing the magnetic flux (Φ) of the magnetic field applied to the shaft surface. Magnetic flux (Φ) is calculated by the magnetomotive force N・I (N: number of turns of excitation winding; ■: excitation current) and magnetic resistance R (shaft surface,
It is a function (Φ=N-1/R) of the resistance of each part such as the yoke member and the gap G between the shaft surface and the yoke member, and under the condition that the magnetomotive force is constant, the magnetic flux (Φ) In order to increase , it is necessary to decrease the resistance of the magnetic circuit.
その手段として、軸体（１）およびヨーク部材（３０）
を透磁率の高い材料に変更することが考えられるが、軸
体（１）は機械構造部材としての強度設計の点から、ま
たヨーク部材（３０）は、所定形状に成形するための加
工性や使用環境条件（例えば熱的影響）等から、それぞ
れの材質選択に制約が加えられる。またこれらの部材の
材質変更によりもたらされる回路抵抗低減効果は小さい
。As the means, the shaft body (1) and the yoke member (30)
It is conceivable to change the shaft body (1) to a material with high magnetic permeability, but the shaft body (1) may be changed from the viewpoint of strength design as a mechanical structural member, and the yoke member (30) may be Restrictions are placed on the selection of each material due to usage environmental conditions (for example, thermal effects). Furthermore, the effect of reducing circuit resistance brought about by changing the materials of these members is small.
磁気回路全体の抵抗に占める最も大きい抵抗は、．軸体
（１）の表面とヨーク部材（３０）との間隙（Ｇ）に起
因する抵抗である。その磁気抵抗を小さくするには、間
隙（Ｇ）をできるだけ狭くすべきことは言うまでもない
が、高速回転する軸体（１）とヨーク部材（３０）との
接触およびそれによるトルクセンサ破損等のトラブル回
避のためには、一定の間隙（約ｌｍ）を必要とし、従っ
てその間隙部分の磁気抵抗とそれに因る磁束（Φ）の低
減およびトルク検出感度の低下を免れない。The largest resistance in the total resistance of the magnetic circuit is. This resistance is caused by the gap (G) between the surface of the shaft (1) and the yoke member (30). In order to reduce the magnetic resistance, it goes without saying that the gap (G) should be as narrow as possible, but this can also cause problems such as contact between the high-speed rotating shaft (1) and the yoke member (30) and damage to the torque sensor due to this. In order to avoid this, a certain gap (approximately lm) is required, and therefore, the magnetic resistance in the gap portion and the resulting reduction in magnetic flux (Φ) and torque detection sensitivity are unavoidable.
本発明は、上記に鑑みてなされたものであり、軸体とヨ
ーク部材との間に所要の間隙が与えられた状態において
、その間隙の磁気抵抗を低減して磁束（Φ）を増大させ
ることにより、薄肉のヨーク部材であっても高感度のト
ルク検出を可能とした改良された磁歪式トルクセンサを
提供するものである。The present invention has been made in view of the above, and has an object to reduce the magnetic resistance of the gap and increase the magnetic flux (Φ) in a state where a required gap is provided between the shaft body and the yoke member. This provides an improved magnetostrictive torque sensor that enables highly sensitive torque detection even with a thin yoke member.
本発明は、前記のように円環状ボビン（２０）の外周面
に励磁・検出巻線（１０）を重合捲装したうえ、円周板
面部（３１）とその左右両側の、中央に軸孔（３４．３
４）が形成されている側板面部（３２．３２）とからな
るドーナツ形状の筺体であるヨーク部材（３０）の円周
空間内に嵌納し円筒状ハウジング（４０）に装入固定し
てなる磁歪式トルクセンサにおいて、前記ヨーク部材（
３０）は、側板面部（３２．３２）の軸孔（３４． ３
４）の周縁に、円環状突起が形成されていることを特徴
としている。As described above, the excitation/detection winding (10) is superimposed on the outer peripheral surface of the annular bobbin (20), and the shaft hole is provided in the center of the circular plate surface (31) and both left and right sides thereof. (34.3
The yoke member (30), which is a donut-shaped casing consisting of a side plate surface portion (32, 32) having In the magnetostrictive torque sensor, the yoke member (
30) is the shaft hole (34.3) of the side plate surface part (32.32).
4) is characterized in that an annular projection is formed on the periphery.
以下、本発明のトルクセンサについて実施例を示す図面
を参照して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A torque sensor of the present invention will be described below with reference to drawings showing embodiments.
第１図は、本発明トルクセンサにおけるヨーク部材（３
０）を、その円周空間内に嵌納された励磁・検出巻線（
１０）と共に示した一部切欠斜視図である。FIG. 1 shows the yoke member (3) in the torque sensor of the present invention.
0), and the excitation/detection winding (
10) is a partially cutaway perspective view shown together with FIG.
（３３． ３３）は、ヨーク部材（３０）の側板面部（
３２．３２）の各軸孔（３４．３４）の周縁にそって形
設されている円環状突起である。(33. 33) is the side plate surface part (33) of the yoke member (30).
32.32) is an annular projection formed along the periphery of each shaft hole (34.34).
円環状突起（３３．３３）は軸体（１）表面に対して略
平行な向きに突出している。その突出幅（側板面部の内
側面から突出端面までの軸方向幅）Ｗは、ヨーク部材（
３０）のサイズ、例えば軸孔（３４）の口径の大小等に
関わりなく、例えば２〜３ｍｍ程度であってよい。The annular projection (33, 33) projects in a direction substantially parallel to the surface of the shaft (1). The protruding width (width in the axial direction from the inner surface of the side plate surface portion to the protruding end surface) W is the yoke member (
30) may be, for example, about 2 to 3 mm, regardless of the diameter of the shaft hole (34).
上記ヨーク部材（３０）は、例えば機械加工またはプレ
ス加工等により成形される半割タイプの部材であって、
径方向に２分割された２つの半円形状部材を、ボビン（
２０）に攪装された励磁・検出巻線（１０）に被せ、そ
れらの分割面を重ね合わせて接合することによりドーナ
ツ状の筺体に組立てられる。The yoke member (30) is a half-split type member formed by, for example, machining or press working, and
Two semicircular members divided into two in the radial direction are placed on a bobbin (
20) is placed over the stirred excitation/detection winding (10), and their divided surfaces are overlapped and joined to form a doughnut-shaped housing.
ヨーク部材（３０）の肉厚は、通常２１ａｌｌ程度であ
るが、本発明における肉厚はそれより薄肉、例えば０．
５〜ＩＷ程度であって構わない。The wall thickness of the yoke member (30) is normally about 21all, but the wall thickness in the present invention is thinner than that, for example, 0.5mm.
It may be about 5 to IW.
第２図は、上記励磁・検出巻線（１０）が嵌納された２
つのヨーク部材（３０） （３０）を、円筒状ハウジン
グ（４０）内に装入・固定したうえ、軸受（５０． ５
０）を介して軸体（１）に回転対称に係装して差動型ト
ルクセンサを構成した例を示している。Figure 2 shows the above-mentioned excitation/detection winding (10) fitted into the 2
The two yoke members (30) (30) are inserted and fixed into the cylindrical housing (40), and the bearing (50.
0) is rotationally symmetrically engaged with the shaft body (1) to constitute a differential torque sensor.
本発明のトルクセンサは、ヨーク部材（３０）の側板面
部（３２．３２）の軸孔（３４．３４）周縁に円環状突
起（３３．３３）が形設されている点を除いて、構成上
特別の制限や条件の付加はなく、例えばボビン（２０）
およびヨーク部材（３０）の材質・サイズや、励磁・検
出巻線（１０）の捲装態様、あるいはヨーク部材（３０
）のハウジング（４０）内への装入・固定態様等は、第
４図に示した従来公知のトルクセンサにおけるそれと同
様のものであってよい。The torque sensor of the present invention has a structure except that an annular projection (33.33) is formed around the shaft hole (34.34) of the side plate surface portion (32.32) of the yoke member (30). There are no special restrictions or conditions added, for example, bobbin (20)
and the material and size of the yoke member (30), the winding mode of the excitation/detection winding (10), or the yoke member (30).
) may be inserted and fixed into the housing (40) in the same manner as in the conventionally known torque sensor shown in FIG.
本発明のトルクセンサの励磁検出回路構成は任意である
。第４図は、前記第２図の差動型トルクセンサについて
その励磁検出回路構成の例を示している。２つの励磁コ
イル（１１） （１１）は同極性に接続されており、高
周波電源（２）に励磁されて軸体（１）の磁気異方性帯
域（１・１）（１・１）に交番磁界を印加する。２つの
検出巻線（ｌ２）と（１２）は逆極性に接続され、その
端子に同期整流器（３）が接続されている。The excitation detection circuit configuration of the torque sensor of the present invention is arbitrary. FIG. 4 shows an example of the excitation detection circuit configuration of the differential torque sensor shown in FIG. 2. The two excitation coils (11) (11) are connected with the same polarity, and are excited by the high frequency power supply (2) to generate magnetic anisotropy bands (1・1) (1・1) of the shaft body (1). Apply an alternating magnetic field. The two detection windings (12) and (12) are connected with opposite polarity and a synchronous rectifier (3) is connected to their terminals.
このトルクセンサにおいて、回転軸（１）にトルクが印
加されていない状態では、２つの磁気異方性域（１・ｌ
）と（ｌ・１）の透磁率は相等しいので、方の検出巻線
（１２）に生じる誘起電圧と、他方の検出巻線（ｌ２）
に生じる誘起電圧とは互いに打ち消し合い、出力は現れ
ない。回転軸（１）にトルク（Ｔ）が印加されると、２
つの磁気異方性域（１・１）と（１・１）の一方には張
力が、他方には圧縮力がそれぞれ選択的に作用すること
により、一方の磁気異方性域の透磁率は増加し、他方の
それは減少する。この透磁率の差動的な変化により、一
方の検出巻線（１２）の誘起電圧は増加し、他方の検出
巻線（１２）の誘起電圧は減少する。その差が同期整流
器（３）により直流電圧として出力され、その出力値の
大きさから印加トルクの大きさが、また出力値の正負の
符号からトルクの印加方向がそれぞれ検出される。In this torque sensor, when no torque is applied to the rotating shaft (1), two magnetic anisotropy regions (1・l
) and (l・1) have the same magnetic permeability, so the induced voltage generated in one detection winding (12) and the other detection winding (l2)
The induced voltage generated in both cancels each other out, and no output appears. When torque (T) is applied to the rotating shaft (1), 2
By selectively applying tension to one of the two magnetic anisotropy regions (1・1) and compressive force to the other, the permeability of one magnetic anisotropy region increases while the other It decreases. Due to this differential change in magnetic permeability, the induced voltage in one detection winding (12) increases and the induced voltage in the other detection winding (12) decreases. The difference is output as a DC voltage by the synchronous rectifier (3), and the magnitude of the applied torque is detected from the magnitude of the output value, and the direction of torque application is detected from the positive or negative sign of the output value.
本発明トルクセンサのヨーク部材（３０）の軸孔（３４
）周縁に形設されている円環状突起（３３．３３）は、
ヨーク部材（３０）と軸体（１）表面との間の間隙（Ｇ
）である空間磁路に断面積拡大効果を与える。第３図は
、その空間磁路（Ｇ）の磁束線を模式的に表している。The shaft hole (34) of the yoke member (30) of the torque sensor of the present invention
) The annular projection (33.33) formed on the periphery is
The gap (G) between the yoke member (30) and the surface of the shaft body (1)
) gives the effect of enlarging the cross-sectional area of the spatial magnetic path. FIG. 3 schematically represents the magnetic flux lines of the spatial magnetic path (G).
この円環状突起（３３．３３）による間隙（Ｇ）の磁路
断面積拡大効果により、間隙（Ｇ）の磁気抵抗が減少し
、磁束（Φ）が増大する結果、軸体（１）に印加される
トルクの検出感度（Ｓ）〔Ｓ ＝（Ｖｔ Ｖｏ）／
Ｖｏ，Ｖｏ ： トルク無印加時の検出出力電圧，Ｖ７
：定格トルク印加時の検出出力電圧〕が高められる。そ
の検出感度の向上は、後記実施例に示すように約１０％
ないし、それ以上に達する。特に、ヨーク部材としてプ
レス成形加工品等の薄肉品（例えば、肉厚二０．５〜ｉ
ｎｎ）を使用する場合における円環状突起（３３．３３
）による検出感度の増加率は大である。Due to the effect of expanding the magnetic path cross-sectional area of the gap (G) due to this annular protrusion (33.33), the magnetic resistance of the gap (G) decreases and the magnetic flux (Φ) increases, resulting in an increase in the magnetic flux (Φ) applied to the shaft body (1). Detection sensitivity of torque (S) [S = (Vt Vo)/
Vo, Vo: Detection output voltage when no torque is applied, V7
:Detected output voltage when rated torque is applied] is increased. The improvement in detection sensitivity is approximately 10% as shown in the example below.
No more than that. In particular, as a yoke member, thin-walled products such as press-formed products (for example, wall thickness 20.5 to i
Annular protrusion (33.33
) has a large increase in detection sensitivity.
１隻五土
ヨーク部材（３０）として、ＰＣパーマロイ合金（７５
％Ｎｉ−２５％Ｆｅ）薄板のプレス加工成形品であって
、第１図に示す円環状突起（３３．３３）を有するヨー
ク部材（これをａとする）、および円環状突起を有しな
い従来型ヨーク部材（これをｂとする）を用意し、差動
型構造のトルクセンサＡ（ヨーク部材ａ使用）およびト
ルクセンサＢ（ヨーク部材ｂ使用）を組立て、それぞれ
について第４図の励磁・検出回路によるトルク検出試験
を行った。One Goto yoke member (30) was made of PC permalloy alloy (75
%Ni-25%Fe) thin plate press-formed product, which includes a yoke member (hereinafter referred to as a) having an annular projection (33.33) shown in Fig. 1, and a conventional one without an annular projection. Prepare a type yoke member (this will be referred to as b), assemble the differential type torque sensor A (using yoke member a) and torque sensor B (using yoke member b), and perform the excitation and detection shown in Fig. 4 for each. A torque detection test using the circuit was conducted.
（１）ヨーク部材（３０）
ａ：肉厚１ａａｍ、円環状突起の突出幅（ｗ）２ｍｍ，
ｂ＝肉厚１閣、円環状突起なし．
（２）軸体（１）：Ｃｒ−Ｍｏ系強靭鋼（ＪＩＳ Ｇ
４１０３ＳＮＣＭ８１５相当）、磁気異方性域は螺旋溝
刻設（傾斜角度４５゜， −４５” ） 、軸径２５ｍ
．（３）ヨーク部材と軸体表面の間隙（Ｇ）：１ｍｍ（
４）励磁電流： ４０−ｍＡ ｒｔａｓ （周波数１０
ｋＨｚ）。(1) Yoke member (30) a: Wall thickness 1aam, protrusion width (w) of annular projection 2mm,
b=1 wall thickness, no toric protrusion. (2) Shaft (1): Cr-Mo tough steel (JIS G
4103SNCM815 equivalent), magnetic anisotropy area is spiral grooved (incline angle 45°, -45”), shaft diameter 25m
．． (3) Gap between yoke member and shaft surface (G): 1mm (
4) Excitation current: 40-mA rtas (frequency 10
kHz).
裏蓋１
ヨーク部材（３０）の肉厚が０．５ ｓＩＩＩ１である
点を除いて前記実施例１におけるトルクセンサＡとおな
じトルクセンサ（これをＡとする）、およびトルクセン
サＢと同じトルクセンサ（これをＢとする）を組立て、
それぞれについて実施例１と同じトルク検出試験を行っ
た。Back cover 1 The same torque sensor as torque sensor A in Example 1 (hereinafter referred to as A) except that the wall thickness of the yoke member (30) is 0.5 sIII1, and the same torque sensor as torque sensor B Assemble (this is called B),
The same torque detection test as in Example 1 was conducted for each.
第１表に各実施例のトルク検出試験結果を示す。Table 1 shows the torque detection test results for each example.
表中、トルクセンサＡ（発明例）の検出感度ＳＡ、およ
びトルクセンサＢ（従来型）の検出惑度ＳＩ＋は、それ
ぞれ（Ｖｔ Ｖｏ）／ Ｖｏ （Ｖｏ ： トルク無
印加時の検出々力電圧，ｖ１：定格トルク印加時の検出
々力電圧〕であり、検出感度増加率（％）は、（Ｓａ
Ｓｓ）／ ＳｉＸ１００（％）である。In the table, the detection sensitivity SA of torque sensor A (invention example) and the detection sensitivity SI+ of torque sensor B (conventional type) are respectively (Vt Vo)/Vo (Vo: detection force voltage when no torque is applied, v1: Detected force voltage when rated torque is applied], and the detection sensitivity increase rate (%) is (Sa
Ss)/SiX100 (%).
第１表のトルク検出試験結果から、ヨーク部材に円環状
突起が形成されている発明例のトルクセンサＡは、円環
状突起を有しない従来型トルクセンサＢに比べて検出感
度が高く、また実施例１のトルクセンサＢと実施例２の
トルクセンサＢとの比較からわかるようにヨーク部材の
肉厚が薄くなると検出感度が低下するが、ヨーク部材に
円環状突起を形成することにより薄肉化に伴う感度低下
が効果的に補償され、
良好な検出感度が確保され
ることかわかる。From the torque detection test results shown in Table 1, the torque sensor A of the invention example in which an annular projection is formed on the yoke member has higher detection sensitivity than the conventional torque sensor B that does not have an annular projection. As can be seen from the comparison between torque sensor B of Example 1 and torque sensor B of Example 2, the detection sensitivity decreases as the wall thickness of the yoke member becomes thinner, but by forming an annular projection on the yoke member, the thickness can be reduced. It can be seen that the accompanying decrease in sensitivity is effectively compensated and good detection sensitivity is ensured.
本発明によれば、トルクセンサ構成部材の材質や励磁条
件の変更等を要することなく高いトルク検出惑度が得ら
れる。殊に薄肉のヨーク部材を用いる場合にも良好な検
出感度を確保できるので、ヨーク部材の薄肉化（例えば
、肉厚０．５〜１ｍ＋ａ）とそれによる材料コストの節
減、軽量化等が可能である。また、従来のヨーク部材は
機械加工品が使用されているが、薄肉のヨーク部材は工
程の簡素なプレス加工による成形も可能であり、それに
よる加工コストの低減効果も大である。According to the present invention, high torque detection accuracy can be obtained without changing the material of the torque sensor component or the excitation conditions. In particular, good detection sensitivity can be ensured even when using a thin yoke member, making it possible to make the yoke member thinner (e.g., 0.5 to 1 m+a thick), thereby reducing material costs and weight. be. Further, although conventional yoke members are machined products, thin yoke members can also be formed by press working, which is a simple process, and this has a significant effect of reducing processing costs.
第１図は本発明トルクセンサのヨーク部材をこれに被包
された励磁・検出巻線と共に示す一部切欠斜視図、第２
図は本発明トルクセンサの実施例を示す軸方向断面図、
第３図は本発明トルクセンサにおける磁気回路の磁束線
説明図、第４図はトルクセンサの励磁・検出回路構成の
例を示す図、第５図は従来のトルクセンサを示す軸方向
断面図である。
１０：励磁・検出巻線，１１：励磁巻線，１２：検出巻
線，２０：ボビン，３０：ヨーク部材３１：円周板面部
，３２：側板面部，３３：円環状突起，３４：軸孔．４
０：ハウジング．５０：軸受。FIG. 1 is a partially cutaway perspective view showing the yoke member of the torque sensor of the present invention together with the excitation/detection winding enclosed therein;
The figure is an axial sectional view showing an embodiment of the torque sensor of the present invention.
Fig. 3 is an explanatory diagram of magnetic flux lines of the magnetic circuit in the torque sensor of the present invention, Fig. 4 is a diagram showing an example of the excitation/detection circuit configuration of the torque sensor, and Fig. 5 is an axial cross-sectional view showing a conventional torque sensor. be. 10: Excitation/detection winding, 11: Excitation winding, 12: Detection winding, 20: Bobbin, 30: Yoke member 31: Circumferential plate surface portion, 32: Side plate surface portion, 33: Annular projection, 34: Shaft hole ．． 4
0: Housing. 50: Bearing.
Claims (1)
励磁巻線と、トルクの印加により生じる軸体表面の透磁
率の変化を検出する検出巻線とを円環状ボビンの外周面
に同心円状に重合捲装し、これを、円周板面部と、その
左右両側の軸体挿通孔（以下、「軸孔」）が形成されて
いる側板面部とからなるドーナツ形状の筺体であるヨー
ク部材の円周空間内に嵌納して円筒状ハウジング内に装
入固定したうえ、軸体に回転対称に嵌装してなる磁歪式
トルクセンサにおいて 前記ヨーク部材は、側板面部の軸孔の周縁に、軸体表面
と略平行な向きの円環状突起が形成されていることを特
徴とする磁歪式トルクセンサ。[Claims] 1. An excitation winding that excites the surface of a torque transmission shaft (hereinafter referred to as "shaft") and a detection winding that detects changes in magnetic permeability on the surface of the shaft caused by application of torque. The outer peripheral surface of an annular bobbin is wrapped concentrically in a concentric manner, and this consists of a circumferential plate surface part and a side plate surface part in which shaft insertion holes (hereinafter referred to as "shaft holes") are formed on both left and right sides of the circumferential plate surface part. In a magnetostrictive torque sensor, the yoke member is fitted into a circumferential space of a yoke member, which is a donut-shaped housing, inserted and fixed into a cylindrical housing, and is rotationally symmetrically fitted onto a shaft body. A magnetostrictive torque sensor characterized in that an annular protrusion oriented substantially parallel to the shaft surface is formed on the periphery of the shaft hole in the side plate surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1455290A JP2827025B2 (en) | 1990-01-23 | 1990-01-23 | Magnetostrictive torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1455290A JP2827025B2 (en) | 1990-01-23 | 1990-01-23 | Magnetostrictive torque sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03218427A true JPH03218427A (en) | 1991-09-26 |
| JP2827025B2 JP2827025B2 (en) | 1998-11-18 |
Family
ID=11864313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1455290A Expired - Fee Related JP2827025B2 (en) | 1990-01-23 | 1990-01-23 | Magnetostrictive torque sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2827025B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002156296A (en) * | 2000-09-27 | 2002-05-31 | Abb Ab | Torque converter |
| JP2020030091A (en) * | 2018-08-22 | 2020-02-27 | 多摩川精機株式会社 | Torque sensor |
-
1990
- 1990-01-23 JP JP1455290A patent/JP2827025B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002156296A (en) * | 2000-09-27 | 2002-05-31 | Abb Ab | Torque converter |
| JP2020030091A (en) * | 2018-08-22 | 2020-02-27 | 多摩川精機株式会社 | Torque sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2827025B2 (en) | 1998-11-18 |
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