JPH06241924A - Torque detector - Google Patents
Torque detectorInfo
- Publication number
- JPH06241924A JPH06241924A JP5654993A JP5654993A JPH06241924A JP H06241924 A JPH06241924 A JP H06241924A JP 5654993 A JP5654993 A JP 5654993A JP 5654993 A JP5654993 A JP 5654993A JP H06241924 A JPH06241924 A JP H06241924A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- shaft
- rotary shaft
- rotating shaft
- torque
- 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.)
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は回転駆動系の制御や監視
を行う際に必要となる回転軸のトルク検出に使用される
トルク検出器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque detector used for detecting the torque of a rotary shaft which is necessary for controlling and monitoring a rotary drive system.
【０００２】[0002]
【従来の技術】自動車のエンジン、電気自動車用の電動
モータ等をはじめとして、各種分野における回転駆動系
では、トルクが印加される回転軸にはそのトルクに比例
した歪が発生することが知られている。これらの回転駆
動系ではその制御や監視のために回転軸のトルクを検出
する必要がある。このトルクを検出するトルク検出器と
して、従来は歪ゲージ式、位相検出式、磁歪式など各種
方式のトルク検出器が使用されていた。2. Description of the Related Art It is known that in a rotary drive system in various fields such as an automobile engine, an electric motor for an electric vehicle and the like, distortion proportional to the torque is generated on a rotating shaft to which the torque is applied. ing. In these rotary drive systems, it is necessary to detect the torque of the rotary shaft in order to control and monitor the rotary drive system. As a torque detector for detecting this torque, various types of torque detectors such as a strain gauge type, a phase detection type and a magnetostriction type have been conventionally used.
【０００３】前記トルク検出器のうち歪ゲージ式のもの
は、回転軸の方面に例えば４枚の歪ゲージを接着し、そ
れを基にしてブリッジ回路を形成したものであり、回転
軸に加えられたトルクにより生じる回転軸の歪を電気信
号として検出するものである。Among the above torque detectors, the strain gauge type is a strain gauge type in which, for example, four strain gauges are adhered to the direction of the rotary shaft and a bridge circuit is formed based on the strain gauges. The distortion of the rotating shaft caused by the torque is detected as an electric signal.
【０００４】位相検出式のトルク検出器は、回転軸の軸
方向の２箇所で、光センサや磁気抵抗素子等を用いて交
流の電圧波形の位相差を求め、回転軸のねじれ角からト
ルクを算出するものである。The phase detection type torque detector obtains a phase difference between AC voltage waveforms using an optical sensor or a magnetoresistive element at two locations in the axial direction of the rotary shaft, and calculates torque from the twist angle of the rotary shaft. It is to be calculated.
【０００５】磁歪式のトルク検出器は、回転軸の周囲に
コイルを配して回転軸を励磁し、磁気抵抗の変化（回転
軸内に発生した歪量）からトルクを算出するものであ
る。この方式のトルク検出器は非接触で小型であり、静
止状態でも検出できるため、回転軸のトルク検出に適し
ている。In the magnetostrictive torque detector, a coil is arranged around the rotary shaft to excite the rotary shaft, and the torque is calculated from a change in magnetic resistance (a strain amount generated in the rotary shaft). This type of torque detector is non-contact, small in size, and can be detected even in a stationary state, so it is suitable for detecting the torque of the rotating shaft.
【０００６】磁歪式のトルク検出器の主なものとして従
来は図３に示すものがあった。これは回転軸Ａにトルク
が加わると回転軸Ａの表面に４５°方向の引張応力と−
４５°方向の圧縮応力が働き、これらがトルクに比例し
た値となることを利用したものである。そして、強磁性
体からなる回転軸Ａをその軸方向に、励磁コイルＢによ
って交流磁化させておき、トルクが回転軸Ａに印加され
てその表面に４５°方向の引張応力と−４５°方向の圧
縮応力が働くと４５°方向に磁化され易くなるように
し、このとき励磁コイルＢと直交状に配置されている検
出コイルＣにより直交成分に応じた起電力を検出するよ
うにしたものである。A conventional magnetostrictive torque detector is shown in FIG. 3 as a main one. This is because when torque is applied to the rotating shaft A, tensile stress in the direction of 45 ° is applied to the surface of the rotating shaft A.
This is utilized because the compressive stress in the 45 ° direction acts and these become values proportional to the torque. Then, the rotating shaft A made of a ferromagnetic material is AC-magnetized in its axial direction by an exciting coil B, and torque is applied to the rotating shaft A so that the surface thereof has a tensile stress of 45 ° direction and a −45 ° direction. When a compressive stress acts, it is easily magnetized in the direction of 45 °, and at this time, an electromotive force corresponding to the orthogonal component is detected by the detection coil C arranged orthogonal to the exciting coil B.
【０００７】磁歪式トルク検出器の他の従来例として図
４、図５に示すものがあった。これは強磁性体からなる
回転軸Ａをその軸方向に励磁する励磁コイルＢと、回転
軸Ａの周囲に等間隔に配置した検出コイルＣとから構成
され、印加されたトルクに応じて起電力を検出コイルＣ
により検出できるようにしたものである。なお、図４、
図５のＤは検出コア輪、Ｅは磁極片、Ｆは検出コア、Ｇ
は磁気センサ、Ｈは導体環である。Another conventional example of the magnetostrictive torque detector is shown in FIGS. 4 and 5. This is composed of an exciting coil B for exciting a rotating shaft A made of a ferromagnetic material in its axial direction and a detecting coil C arranged at equal intervals around the rotating shaft A, and an electromotive force according to an applied torque. Detect coil C
It can be detected by. In addition, in FIG.
In FIG. 5, D is a detection core wheel, E is a pole piece, F is a detection core, and G is a detection core.
Is a magnetic sensor and H is a conductor ring.
【０００８】[0008]
【発明が解決しようとする課題】前記の歪ゲージ式のト
ルク検出器は、回転軸に取付けられて回転する歪ゲージ
より信号を取り出すためスリップリングが必要となり、
信頼性、寿命の点で問題があった。The above-mentioned strain gauge type torque detector requires a slip ring in order to take out a signal from the rotating strain gauge attached to the rotating shaft.
There were problems in terms of reliability and life.
【０００９】前記の位相検出式のトルク検出器は検出部
が２箇所となり広いスペースを必要とし、また、一般的
には回転軸が静止してる場合はトルクを検出できないと
いう問題があった。The above-mentioned torque detector of the phase detection type has a problem that it has a large space due to two detecting portions, and generally cannot detect the torque when the rotating shaft is stationary.
【００１０】磁歪式のトルク検出器のうち図３のもの
は、回転軸Ａの外周の一点で検出するため、回転軸Ａが
周方向に不均一であると周方向表面において磁気特性が
ばらつき、検出コイルＣを設置する場所により検出特性
が大きくばらつくという問題があった。この問題を解決
するためには周方向に多数の検出部を配置して周方向の
出力変動を平均化する必要がある。しかしながら図３の
構造では周方向に多数の検出部を配置するには空間的に
限界があった。Among the magnetostrictive torque detectors shown in FIG. 3, since the detection is made at one point on the outer circumference of the rotation axis A, if the rotation axis A is non-uniform in the circumferential direction, the magnetic characteristics will vary on the circumferential surface. There is a problem that the detection characteristics greatly vary depending on the place where the detection coil C is installed. In order to solve this problem, it is necessary to arrange a large number of detectors in the circumferential direction and average output fluctuations in the circumferential direction. However, in the structure shown in FIG. 3, there is a spatial limit in arranging a large number of detecting portions in the circumferential direction.
【００１１】また磁歪式のトルク検出器のうち図４、図
５のものでは、回転軸Ａの周方向に多数の検出コイルＣ
を配置できるものの、励磁コイルＢは回転軸Ａそのもの
を励磁コアとして使用しているため、発生する磁束は回
転軸Ａ全体を磁化するが、検出コイルＣは回転体Ａの表
面の磁化成分だけを検出するため励磁効率が悪いという
問題があった。特に、回転軸Ａの透磁率が低いほど、ま
た励磁する交流周波数が低いほど、回転体Ａを通過する
磁束は回転体Ａの内部にまで及ぶため影響が大きい。In the magnetostrictive torque detectors shown in FIGS. 4 and 5, a large number of detection coils C are arranged in the circumferential direction of the rotation axis A.
However, since the exciting coil B uses the rotating shaft A itself as an exciting core, the generated magnetic flux magnetizes the entire rotating shaft A, but the detecting coil C detects only the magnetization component of the surface of the rotating body A. There is a problem that the excitation efficiency is low because it is detected. In particular, the lower the magnetic permeability of the rotating shaft A and the lower the exciting AC frequency, the greater the influence that the magnetic flux passing through the rotating body A reaches inside the rotating body A.
【００１２】本発明の目的は、回転軸に印加されるトル
クにより生じる周方向の磁化成分を、回転軸の周方向の
多数のポイントで検出でき、また、回転軸の表面を効率
よく磁化できるトルク検出器を提供することにある。The object of the present invention is to detect the magnetization component in the circumferential direction generated by the torque applied to the rotary shaft at a number of points in the circumferential direction of the rotary shaft and to efficiently magnetize the surface of the rotary shaft. To provide a detector.
【００１３】[0013]
【課題を解決するための手段】本発明のうち請求項１の
トルク検出器は、図１、２に示す様に表面が強磁性体よ
りなる回転軸１の周囲に非接触で設置されて回転軸１の
表面をその軸と平行方向に励磁する励磁コイル２と、同
回転軸１の励磁領域の外周に等間隔に配置された複数の
検出コイル３とを備え、同検出コイル３により検出され
る信号から回転軸１の磁歪量を測定するようにしたトル
ク検出器において、前記励磁コイル２が、回転軸１と平
行方向の断面が概略Ｕ字型である磁芯４の表面にコイル
８を巻いた分割ヘッド６を、回転軸１の外周に同心円状
に２以上配置してなるものである。The torque detector according to claim 1 of the present invention rotates as shown in FIGS. 1 and 2 in a non-contact manner around a rotary shaft 1 whose surface is made of a ferromagnetic material. An exciting coil 2 for exciting the surface of the shaft 1 in a direction parallel to the axis, and a plurality of detecting coils 3 arranged at equal intervals on the outer circumference of the exciting region of the rotating shaft 1 are detected by the detecting coil 3. In the torque detector configured to measure the amount of magnetostriction of the rotating shaft 1 from the signal, the exciting coil 2 has a coil 8 on the surface of a magnetic core 4 whose cross section in a direction parallel to the rotating shaft 1 is a substantially U-shape. Two or more wound split heads 6 are concentrically arranged on the outer circumference of the rotary shaft 1.
【００１４】本発明のうち請求項２のトルク検出器は、
図１に示す様に前記検出コイル３が励磁コイル２の内部
に収納されてなるものである。The torque detector according to claim 2 of the present invention is
As shown in FIG. 1, the detection coil 3 is housed inside the exciting coil 2.
【００１５】[0015]
【作用】請求項１のトルク検出器では、２以上の分割ヘ
ッド６を回転軸１の外周に同心円状に配置して励磁コイ
ル２を構成するので、回転軸１に印加されるトルクによ
り生じる回転軸１の周方向の磁化成分を、回転軸１の周
方向の多数のポイントで検出することができ、同周方向
の不均一による磁化特性のばらつきが低減される。ま
た、励磁コイル６の磁芯４の断面が概略Ｕ時型であるた
め、励磁コイル２に交流電流が加えられると同励磁コイ
ル２の磁芯４の先端１５から回転軸１の表面を通り磁芯
４の反対側先端１６にわたる（或はその逆の）磁気回路
が形成され、この結果、励磁コイルに２から生じる磁束
が回転軸１の表面を軸方向に通過することになり、回転
軸１の表面を効率良く磁化される。In the torque detector of claim 1, since the exciting coil 2 is constructed by arranging two or more divided heads 6 concentrically on the outer periphery of the rotary shaft 1, the rotation generated by the torque applied to the rotary shaft 1 is performed. The magnetization component in the circumferential direction of the shaft 1 can be detected at a number of points in the circumferential direction of the rotating shaft 1, and variations in the magnetization characteristics due to nonuniformity in the circumferential direction can be reduced. Further, since the magnetic core 4 of the exciting coil 6 has a substantially U-shaped cross section, when an alternating current is applied to the exciting coil 2, the magnetic core 4 passes through the surface of the rotary shaft 1 from the tip 15 of the magnetic core 4 of the exciting coil 2. A magnetic circuit is formed across the tip 16 on the opposite side of the core 4 (or vice versa), and as a result, the magnetic flux generated from the exciting coil 2 passes through the surface of the rotating shaft 1 in the axial direction. The surface is efficiently magnetized.
【００１６】請求項２のトルク検出器では、検出コイル
３が励磁コイル２の内部に収納されてなるので、検出コ
イル３が外と磁気的に遮蔽され、外乱の影響を受けにく
くなる。In the torque detector of the second aspect, since the detection coil 3 is housed inside the excitation coil 2, the detection coil 3 is magnetically shielded from the outside and is less susceptible to the influence of disturbance.
【００１７】[0017]
【実施例】本発明のトルク検出器を図１、２に示す実施
例に基づいて詳細に説明する。これらの図に示すトルク
検出器は、表面に磁性層が形成されるか、全体が強磁性
体からなる回転軸１の周囲に、一定間隔を保って非接触
に配置された励磁コイル２と、同励磁コイル２の内側
に、同じく回転軸１の表面に一定間隔を保って非接触に
配置された検出コイル３とからなる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The torque detector of the present invention will be described in detail based on the embodiments shown in FIGS. The torque detector shown in these figures has a magnetic layer formed on the surface thereof, or an exciting coil 2 arranged in a non-contact manner at regular intervals around a rotary shaft 1 made of a ferromagnetic material, Inside the excitation coil 2, there is a detection coil 3 which is also arranged in a non-contact manner on the surface of the rotary shaft 1 at a constant interval.
【００１８】前記の励磁コイル２は図２に詳細に示す様
に、回転軸１の外周にそれを囲むように同心円状に配置
された２以上の分割ヘッド６により構成される。この分
割ヘッド６はフェラント等により回転軸１と平行方向の
断面が概略Ｕ字型となるように形成された磁芯４の幅方
向中央付近に、同磁芯４の表面に沿ってコイル８が所望
回数巻かれてなる。また、磁芯４はその周方向端面の幅
方向中央部に凹部９を設けて、同磁芯４に巻かれるコイ
ル８が同凹部９内を通り、回転軸１の外周に対向して配
置した磁芯４の接触面１１同士が互いに密着して、両接
触面１１間に隙間ができないようにしてある。このコイ
ル８には励磁電源回路、発信器（図示せず）が接続され
る。励磁コイル２の分割数（分割ヘッド６の数）は３以
外でもよいが、少ない方が好ましい。As shown in detail in FIG. 2, the exciting coil 2 is composed of two or more split heads 6 concentrically arranged around the outer circumference of the rotary shaft 1 so as to surround it. The split head 6 has a coil 8 formed along the surface of the magnetic core 4 near the center in the width direction of the magnetic core 4 formed by a ferrant or the like so that the cross section in the direction parallel to the rotating shaft 1 has a substantially U shape. It is wound a desired number of times. Further, the magnetic core 4 is provided with a concave portion 9 in the widthwise central portion of the circumferential end face thereof, and the coil 8 wound around the magnetic core 4 passes through the concave portion 9 and is arranged so as to face the outer circumference of the rotary shaft 1. The contact surfaces 11 of the magnetic core 4 are in close contact with each other so that no gap is formed between the contact surfaces 11. An excitation power supply circuit and a transmitter (not shown) are connected to the coil 8. The number of divisions of the excitation coil 2 (the number of division heads 6) may be other than 3, but it is preferable that the number is smaller.
【００１９】前記の検出コイル３は図２に詳細に示す様
に、フェライト等の磁芯１２にコイル１３を巻いた磁気
ヘッド１４を回転軸１の外周に等間隔に複数個配置され
て構成される。複数の磁気ヘッド１４は個々に独立した
検出磁気回路を形成し、電力計（図示せず）にて起電力
を検出する。この検出コイル３は多く配置するほど回転
軸１の周方向の不均一の影響を低減できる。As shown in detail in FIG. 2, the detection coil 3 is constructed by arranging a plurality of magnetic heads 14 each having a coil 13 wound around a magnetic core 12 of ferrite or the like on the outer circumference of the rotary shaft 1 at equal intervals. It The plurality of magnetic heads 14 each form an independent detection magnetic circuit, and an electrometer (not shown) detects an electromotive force. The more the detection coils 3 are arranged, the more the influence of unevenness in the circumferential direction of the rotary shaft 1 can be reduced.
【００２０】次に、図１、図２の構成のトルク検出器の
動作を説明する。励磁コイル２に交流電流が加えられる
と同励磁コイル２の磁芯４の先端１５から回転軸１の表
面を通り磁芯４の反対側の先端１６にわたる（或はその
逆にわたる）磁気回路が形成され、この結果、励磁コイ
ル２により生じる磁束は回転軸１の表面をその軸方向に
通過することになり、回転軸１の表面のみが効率良く磁
化される。Next, the operation of the torque detector configured as shown in FIGS. 1 and 2 will be described. When an alternating current is applied to the exciting coil 2, a magnetic circuit is formed from the tip 15 of the magnetic core 4 of the exciting coil 2 to the tip 16 on the opposite side of the magnetic core 4 through the surface of the rotary shaft 1 (or vice versa). As a result, the magnetic flux generated by the exciting coil 2 passes through the surface of the rotary shaft 1 in its axial direction, and only the surface of the rotary shaft 1 is efficiently magnetized.
【００２１】この状態で回転軸１にトルクが加わると同
回転軸１に対し４５°方向に圧縮力が生じ、同回転軸１
と垂直方向の磁化成分が発生する。この磁化成分が検出
コイル３により起電力として検出される。検出コイル３
は回転軸１の周囲に等間隔に配置されているため、各々
の検出コイル３の検出電圧の総和は、印加されるトルク
のみに比例し、回転軸１の周方向の不均一によるばらつ
きの影響を受けない。また、検出コイル３が励磁コイル
２の内部に収納されているため、外的要因による磁気的
な影響を受けにくい。When torque is applied to the rotary shaft 1 in this state, a compressive force is generated in the direction of 45 ° with respect to the rotary shaft 1, and the rotary shaft 1
And a perpendicular magnetization component is generated. This magnetization component is detected by the detection coil 3 as an electromotive force. Detection coil 3
Are arranged around the rotary shaft 1 at equal intervals, the sum of the detection voltages of the respective detection coils 3 is proportional to only the applied torque, and the influence of variations due to the unevenness of the rotary shaft 1 in the circumferential direction. Do not receive Further, since the detection coil 3 is housed inside the exciting coil 2, it is unlikely to be magnetically affected by external factors.
【００２２】[0022]
【発明の効果】本発明のトルク検出器は次の様な効果が
ある。 ．回転軸１に印加されるトルクにより回転軸１に生じ
る周方向の磁化成分を、回転軸１の周方向の多数のポイ
ントで検出できるため、回転軸１の周方向の不均一によ
る磁化特性のばらつきが低減され、検出精度が向上す
る。 ．励磁コイル２が、断面形状が概略Ｕ字型の磁芯４に
コイル８を巻いた分割ヘッド６を回転軸１の周方向に２
以上配置して構成されるため、回転体１の表面を効率良
く磁化することができ、磁化の効率が良い。 ．検出コイル３が励磁コイル２の内部に収納されて外
と磁気的に遮蔽されるため、外乱の影響を受けにくく、
誤動作しにくく、検出精度が向上する。The torque detector of the present invention has the following effects. ． Since the circumferential magnetization component generated in the rotary shaft 1 by the torque applied to the rotary shaft 1 can be detected at a large number of points in the circumferential direction of the rotary shaft 1, the variation in the magnetization characteristics due to the non-uniformity in the circumferential direction of the rotary shaft 1. Is reduced and the detection accuracy is improved. ． The exciting coil 2 includes a split head 6 in which a coil 8 is wound around a magnetic core 4 having a substantially U-shaped cross section, and the split head 6 is provided in the circumferential direction of the rotary shaft 1.
Since they are arranged and configured as described above, the surface of the rotating body 1 can be efficiently magnetized, and the magnetization efficiency is good. ． Since the detection coil 3 is housed inside the excitation coil 2 and magnetically shielded from the outside, it is less likely to be affected by disturbance,
The malfunction does not occur easily and the detection accuracy is improved.
【図１】本発明のトルク検出器の一例を示す断面図。FIG. 1 is a sectional view showing an example of a torque detector of the present invention.
【図２】図１のトルク検出器の分解図。FIG. 2 is an exploded view of the torque detector shown in FIG.
【図３】従来の磁歪式トルク検出器の一例を示す説明
図。FIG. 3 is an explanatory diagram showing an example of a conventional magnetostrictive torque detector.
【図４】従来の磁歪式トルク検出器の他例の側面図。FIG. 4 is a side view of another example of the conventional magnetostrictive torque detector.
【図５】図４の磁歪式トルク検出器のＩ−Ｉ断面図。5 is a sectional view taken along the line I-I of the magnetostrictive torque detector of FIG.
１ 回転軸 ２ 励磁コイル ３ 検出コイル ４ 磁芯 ６ 分割ヘッド ８ コイル 1 rotating shaft 2 excitation coil 3 detection coil 4 magnetic core 6 split head 8 coil
Claims (2)
に非接触で設置されて同回転軸１の表面をその軸と平行
方向に励磁する励磁コイル２と、同回転軸１の励磁領域
の外周に等間隔に配置された複数の検出コイル３とを備
え、同検出コイル３により検出される信号に基づいて回
転軸１にトルクが印加されたときの磁歪量を測定するよ
うにしたトルク検出器において、前記励磁コイル２は回
転軸１と平行方向の断面が概略Ｕ字型である磁芯４の表
面にコイル８が巻かれた分割ヘッド６を、同回転軸１の
外周に同心円状に２以上配置してなることを特徴とする
トルク検出器。1. An exciting coil 2 which is installed around a rotating shaft 1 made of a ferromagnetic material in a non-contact manner to excite the surface of the rotating shaft 1 in a direction parallel to the axis, and an exciting coil 2 for exciting the rotating shaft 1. A plurality of detection coils 3 arranged at equal intervals are provided on the outer circumference of the region, and the magnetostriction amount when torque is applied to the rotary shaft 1 is measured based on a signal detected by the detection coils 3. In the torque detector, the exciting coil 2 has a split head 6 in which a coil 8 is wound around the surface of a magnetic core 4 having a substantially U-shaped cross section in a direction parallel to the rotary shaft 1, and a concentric circle on the outer circumference of the rotary shaft 1. A torque detector characterized in that two or more of them are arranged in a line.
に収納されてなることを特徴とする請求項１のトルク検
出器。2. The torque detector according to claim 1, wherein the detection coil 3 is housed inside the excitation coil 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5654993A JPH06241924A (en) | 1993-02-22 | 1993-02-22 | Torque detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5654993A JPH06241924A (en) | 1993-02-22 | 1993-02-22 | Torque detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06241924A true JPH06241924A (en) | 1994-09-02 |
Family
ID=13030184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5654993A Pending JPH06241924A (en) | 1993-02-22 | 1993-02-22 | Torque detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06241924A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018536854A (en) * | 2015-11-03 | 2018-12-13 | ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ | Apparatus and method for non-contact detection of torque, torsional natural vibration and / or torsional vibration |
-
1993
- 1993-02-22 JP JP5654993A patent/JPH06241924A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018536854A (en) * | 2015-11-03 | 2018-12-13 | ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ | Apparatus and method for non-contact detection of torque, torsional natural vibration and / or torsional vibration |
| US10845257B2 (en) | 2015-11-03 | 2020-11-24 | Basf Se | Device and method for sensing torques, torsional natural frequencies, and/or torsional oscillations without contact |
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