JP2616481B2 - Driving device and driving method for magnetostrictive vibrator - Google Patents
Driving device and driving method for magnetostrictive vibratorInfo
- Publication number
- JP2616481B2 JP2616481B2 JP6363395A JP6363395A JP2616481B2 JP 2616481 B2 JP2616481 B2 JP 2616481B2 JP 6363395 A JP6363395 A JP 6363395A JP 6363395 A JP6363395 A JP 6363395A JP 2616481 B2 JP2616481 B2 JP 2616481B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetostrictive vibrator
- coil
- permanent magnet
- magnetostrictive
- driving device
- 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.)
- Expired - Lifetime
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、電気音響変換器，アク
チュエータ等に用いられる磁歪振動子を、駆動するため
の装置及び方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for driving a magnetostrictive vibrator used for an electroacoustic transducer, an actuator and the like.
【０００２】[0002]
【従来の技術】図２は、従来及び本発明における、磁歪
振動子の磁化−歪み特性を示すグラフである。図３は、
従来及び本発明における、コイル電流−磁歪振動子の磁
化特性を示すグラフである。図５は、従来における磁歪
振動子の駆動装置を示す断面図である。図６は、従来に
おけるコイル電流と磁歪振動子の歪みとの関係を示す波
形図である。以下、これらの図面に基づき説明する。2. Description of the Related Art FIG. 2 is a graph showing magnetization-strain characteristics of a magnetostrictive vibrator according to the prior art and the present invention. FIG.
4 is a graph showing the magnetization characteristics of a coil current-magnetostrictive vibrator according to the related art and the present invention. FIG. 5 is a sectional view showing a conventional driving device for a magnetostrictive vibrator. FIG. 6 is a waveform diagram showing a relationship between a conventional coil current and distortion of a magnetostrictive vibrator. Hereinafter, description will be made based on these drawings.
【０００３】従来の磁歪振動子の駆動装置５０は、円柱
状の磁歪振動子５２と、磁歪振動子５２を挟持する永久
磁石５４ａ，５４ｂと、永久磁石５４ａ，５４ｂに接す
るヨーク５６ａ，５６ｂと、磁歪振動子５２を包囲する
位置に設けられたコイル５８と、磁歪振動子５２に圧縮
力を加えるボルト６０ｃ，６０ｄとから構成されてい
る。永久磁石５４ａ，５４ｂにより磁歪振動子５２に与
える磁気バイアスは、図２に示すように、歪みが飽和す
る領域の約１／２程度（点Ｂ）とする。この状態にて、
コイル５８に正弦波電流を入力すると、図６に示すよう
に、永久磁石５４ａ，５４ｂにより生じた歪みを中心と
して正弦波の歪みが発生する。A conventional magnetostrictive vibrator driving device 50 includes a columnar magnetostrictive vibrator 52, permanent magnets 54a and 54b sandwiching the magnetostrictive vibrator 52, and yokes 56a and 56b in contact with the permanent magnets 54a and 54b. It comprises a coil 58 provided at a position surrounding the magnetostrictive vibrator 52 and bolts 60c and 60d for applying a compressive force to the magnetostrictive vibrator 52. As shown in FIG. 2, the magnetic bias applied to the magnetostrictive vibrator 52 by the permanent magnets 54a and 54b is set to about 1/2 (point B) of the region where the distortion is saturated. In this state,
When a sine wave current is input to the coil 58, a sine wave distortion occurs around the distortion generated by the permanent magnets 54a and 54b as shown in FIG.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来の駆動装
置では、コイル５８にて磁歪振動子５２を直接励磁する
方式であり、コイル５８から見た磁路に磁歪振動子５２
があるため、磁歪振動子５２の透磁率等の影響を大きく
うける。例えば磁歪振動子５２がＴｂ−Ｄｙ−Ｆｅ合金
からなる場合は、その比透磁率が５〜１０程度であり、
磁気回路のヨーク５６ａ，５６ｂとして使用される鉄材
の比透磁率６０００〜８０００に比べて非常に小さい。
したがって、図３に示すように、コイル５８に電流を流
したときに磁歪振動子５２の磁化を変化させにくいた
め、大きな歪みを発生させるには大電流が必要となると
いう問題点があった。However, in the conventional driving device, the magnetostrictive vibrator 52 is directly excited by the coil 58, and the magnetostrictive vibrator 52 is applied to the magnetic path viewed from the coil 58.
Therefore, the influence of the magnetic permeability and the like of the magnetostrictive vibrator 52 is greatly affected. For example, when the magnetostrictive vibrator 52 is made of a Tb-Dy-Fe alloy, its relative magnetic permeability is about 5 to 10,
The specific permeability is very small compared to the relative magnetic permeability 6000 to 8000 of the iron material used as the yokes 56a and 56b of the magnetic circuit.
Therefore, as shown in FIG. 3, there is a problem in that the magnetization of the magnetostrictive vibrator 52 is hardly changed when a current flows through the coil 58, and a large current is required to generate a large distortion.
【０００５】[0005]
【発明の目的】そこで、本発明は、低電流でも大きな歪
みを発生できる、磁歪振動子の駆動装置及び駆動方法を
提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a driving apparatus and a driving method for a magnetostrictive vibrator capable of generating a large distortion even at a low current.
【０００６】[0006]
【課題を解決するための手段】本発明に係る磁歪振動子
の駆動装置は、磁歪振動子と、この磁歪振動子を挟持す
る二個のヨークと、これらのヨークの一方に一端部が接
するとともに当該ヨークの他方に他端部が接する永久磁
石と、前記ヨークの一方に一端部が接するとともに当該
ヨークの他方に他端部が接するコイルとを備えたもので
ある。また、前記磁歪振動子をＴｂ−Ｄｙ−Ｆｅ合金と
してもよい。A driving apparatus for a magnetostrictive vibrator according to the present invention comprises a magnetostrictive vibrator, two yokes sandwiching the magnetostrictive vibrator, one end of which is in contact with one of these yokes. The yoke includes a permanent magnet whose other end is in contact with the other end of the yoke, and a coil whose one end is in contact with one end of the yoke and whose other end is in contact with the other end of the yoke. Further, the magnetostrictive vibrator may be a Tb-Dy-Fe alloy.
【０００７】本発明に係る磁歪振動子の駆動方法は、本
発明に係る磁歪振動子の駆動装置において、前記永久磁
石によって前記磁歪振動子をその飽和歪領域まで磁化し
ておき、前記コイルによって前記永久磁石から出る磁束
を制御するものである。A method of driving a magnetostrictive vibrator according to the present invention is the driving device for a magnetostrictive vibrator according to the present invention, wherein the magnetostrictive vibrator is magnetized to its saturated strain region by the permanent magnet, and the magnet is driven by the coil. It controls the magnetic flux emitted from the permanent magnet.
【０００８】[0008]
【作用】コイルの極性を永久磁石と同じにすると、磁歪
振動子の磁束は多い状態（例えば飽和状態）になる。こ
こで、コイルの極性を永久磁石と逆にすると、永久磁石
とコイルとで閉磁路が形成され、磁歪振動子の磁束は急
減する。When the polarity of the coil is the same as that of the permanent magnet, the magnetic flux of the magnetostrictive vibrator is in a large state (for example, a saturated state). Here, when the polarity of the coil is reversed from that of the permanent magnet, a closed magnetic path is formed by the permanent magnet and the coil, and the magnetic flux of the magnetostrictive vibrator rapidly decreases.
【０００９】[0009]
【実施例】図１は、本発明に係る磁歪振動子の駆動装置
の一実施例を示す斜視図である。以下、この図面に基づ
き説明する。FIG. 1 is a perspective view showing one embodiment of a driving device for a magnetostrictive vibrator according to the present invention. Hereinafter, description will be made based on this drawing.
【００１０】本発明に係る磁歪振動子の駆動装置１０
は、磁歪振動子１２と、この磁歪振動子を挟持するヨー
ク１４ａ，１４ｂと、ヨーク１４ａに一端部１６ａが接
するとともにヨーク１４ｂに他端部１６ｂが接する永久
磁石１６と、ヨーク１４ａに一端部１８ａが接するとと
もにヨーク１４ｂに他端部１８ｂが接するコイル１８と
を備えたものである。また、磁歪振動子１２に圧縮力を
加えるステンレス製のボルト２０ｃ，２０ｄがヨーク１
４ａ，１４ｂ間に付設されている。A driving device 10 for a magnetostrictive vibrator according to the present invention.
The yoke 14a sandwiches the magnetostrictive oscillator 12, the yokes 14a and 14b, the permanent magnet 16 having one end 16a in contact with the yoke 14a and the other end 16b in contact with the yoke 14b, and one end 18a in the yoke 14a. And the coil 18 whose other end 18b is in contact with the yoke 14b. Also, stainless steel bolts 20c and 20d for applying a compressive force to the magnetostrictive vibrator 12 are provided on the yoke 1.
It is provided between 4a and 14b.
【００１１】磁歪振動子１２は、例えばＴｂ−Ｄｙ−Ｆ
ｅ合金からなり、飽和歪量の大きなものである。ヨーク
１４ａ，１４ｂは、ケイ素鋼板製の円柱型又は角型を呈
し、磁歪振動子１２の上下に接着されている。永久磁石
１６は、Ｕ字型を呈し、一端部１６ａ及び他端部１６ｂ
がそれぞれヨーク１４ａ，１４ｂの側面に接合してい
る。コイル１８はＵ字型を呈しており、一端部１８ａ及
び他端部１８ｂが、永久磁石１６の一端部１６ａ及び他
端部１６ｂに対向するように、それぞれヨーク１４ａ，
１４ｂの側面に接合している。ボルト２０ｃ，２０ｄ
は、１０〜２０ＭＰａの圧縮力を磁歪振動子１２に加え
る。The magnetostrictive vibrator 12 is, for example, Tb-Dy-F
It is made of an e-alloy and has a large saturation strain. The yokes 14a and 14b are cylindrical or square made of silicon steel, and are bonded to the upper and lower sides of the magnetostrictive vibrator 12. The permanent magnet 16 has a U-shape, and has one end 16a and the other end 16b.
Are joined to the side surfaces of the yokes 14a and 14b, respectively. The coil 18 has a U-shape, and the yokes 14a and 14a are respectively arranged so that one end 18a and the other end 18b face the one end 16a and the other end 16b of the permanent magnet 16, respectively.
14b. Bolts 20c, 20d
Applies a compressive force of 10 to 20 MPa to the magnetostrictive vibrator 12.
【００１２】図４は、本発明におけるコイル電流と磁歪
振動子の歪みとの関係を示す波形図である。次に、図１
乃至図４に基づき駆動装置１０の動作について説明す
る。FIG. 4 is a waveform diagram showing the relationship between the coil current and the distortion of the magnetostrictive vibrator according to the present invention. Next, FIG.
The operation of the driving device 10 will be described with reference to FIGS.
【００１３】図２に示すように、歪みが飽和する領域で
静歪（点Ａ）が得られるように永久磁石１６にて磁気バ
イアスを磁歪振動子１２に加え、磁化（点Ａ′）する。
こうすることによって、コイル１８にて磁歪振動子１２
の磁化を減らす方向に磁束を加えた場合に大きな歪みの
変化が得られる。As shown in FIG. 2, a magnetic bias is applied to the magnetostrictive vibrator 12 by the permanent magnet 16 so as to obtain static strain (point A) in a region where the strain is saturated, and magnetized (point A ').
By doing so, the magnetostrictive vibrator 12 is
When a magnetic flux is applied in a direction to reduce the magnetization of the substrate, a large change in strain can be obtained.
【００１４】永久磁石１６の一端部１６ａはＮ極であ
り、他端部１６ｂはＳ極である。ここで、永久磁石１６
と同極性となるように、コイル１８の一端部１８ａにＮ
極，他端部１８ｂにＳ極を発生させたとする。このとき
は、磁歪振動子１２はすでに飽和領域まで磁化されてい
るため、磁歪振動子１２の磁化を変化させにくい。一
方、永久磁石１６と逆極性となるように、コイル１８の
一端部１８ａにＳ極，他端部１８ｂにＮ極を発生させた
とする。このときは、永久磁石１６とコイル１８とは閉
磁路を形成し、磁歪振動子１２へ流れる磁束は急減す
る。したがって、磁歪振動子１２の磁化を大きく変化さ
せることができる。よって、図３及び図４に示すよう
に、Ｃ［Ａ］のバイアス電流に正弦波電流を重量してコ
イル１８に入力すると、永久磁石１６により生じた静歪
をピークとして正弦波電流に比例して変化する歪みを、
磁歪振動子１２に発生させることができる。この際、先
に述べたように、従来に比べて小さなコイル電流で磁歪
振動子１２の磁化を大きく変化できるので、低電流で大
きな歪みの変化を発生できる。One end 16a of the permanent magnet 16 has an N pole, and the other end 16b has an S pole. Here, the permanent magnet 16
N is applied to one end 18a of the coil 18 so as to have the same polarity as N.
It is assumed that an S pole is generated at the pole and the other end 18b. At this time, since the magnetostrictive vibrator 12 is already magnetized to the saturation region, it is difficult to change the magnetization of the magnetostrictive vibrator 12. On the other hand, it is assumed that an S pole is generated at one end 18a and an N pole is generated at the other end 18b of the coil 18 so that the polarity is opposite to that of the permanent magnet 16. At this time, the permanent magnet 16 and the coil 18 form a closed magnetic circuit, and the magnetic flux flowing to the magnetostrictive vibrator 12 decreases rapidly. Therefore, the magnetization of the magnetostrictive vibrator 12 can be largely changed. Therefore, as shown in FIGS. 3 and 4, when a sinusoidal current is added to the bias current of C [A] and input to the coil 18, the static strain generated by the permanent magnet 16 peaks and is proportional to the sinusoidal current. Distortion that changes
It can be generated in the magnetostrictive vibrator 12. At this time, as described above, the magnetization of the magnetostrictive vibrator 12 can be largely changed with a small coil current as compared with the related art, so that a large change in strain can be generated with a low current.
【００１５】駆動装置１０は、磁歪振動子１２が比透磁
率の小さいＴｂ−Ｄｙ−Ｆｅ合金等である場合に、より
好適に用いられる。The driving device 10 is more preferably used when the magnetostrictive vibrator 12 is a Tb-Dy-Fe alloy or the like having a small relative magnetic permeability.
【００１６】また、駆動装置１０によれば、コイル１８
が磁歪振動子１２の外側に設けられているので、従来の
ようにコイルが磁歪振動子を包囲する位置に設けられて
いるものに比べて、より大きいコイル１８を取付けるこ
とができる。Further, according to the driving device 10, the coil 18
Is provided outside the magnetostrictive vibrator 12, so that a larger coil 18 can be attached as compared with a conventional coil provided at a position surrounding the magnetostrictive vibrator.
【００１７】[0017]
【発明の効果】本発明に係る磁歪振動子の駆動装置によ
れば、コイル及び永久磁石のそれぞれの両端部を、磁歪
振動子を挟持するヨークを介して、接する構造としたの
で、コイルによって永久磁石から出る磁束を制御でき、
従来に比べて低電流で大きな歪みの変化を発生させるこ
とができる。According to the driving apparatus for a magnetostrictive vibrator according to the present invention, both ends of the coil and the permanent magnet are in contact with each other via the yoke for holding the magnetostrictive vibrator. Control the magnetic flux from the magnet,
A large change in strain can be generated with a lower current than in the conventional case.
【００１８】本発明に係る磁歪振動子の駆動方法によれ
ば、永久磁石にて磁歪振動子の飽和歪領域まで磁化して
静歪を加えておき、コイルにて永久磁石から出る磁束の
方向を制御することにより、従来に比べて低電流で大き
な歪みの変化を発生させることができる。According to the driving method of the magnetostrictive vibrator according to the present invention, the permanent magnet is magnetized to the saturation strain region of the magnetostrictive vibrator to apply static strain, and the direction of the magnetic flux emitted from the permanent magnet is changed by the coil. By performing the control, a large change in strain can be generated at a lower current than in the related art.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に係る磁歪振動子の駆動装置の一実施例
を示す斜視図である。FIG. 1 is a perspective view showing one embodiment of a driving device for a magnetostrictive vibrator according to the present invention.
【図２】従来及び本発明における、磁歪振動子の磁化−
歪み特性を示すグラフである。FIG. 2 shows the magnetization of a magnetostrictive vibrator according to the related art and the present invention.
5 is a graph showing distortion characteristics.
【図３】従来及び本発明における、コイル電流−磁歪振
動子の磁化特性を示すグラフである。FIG. 3 is a graph showing the magnetization characteristics of a coil current-magnetostrictive vibrator according to the related art and the present invention.
【図４】本発明におけるコイル電流と磁歪振動子の歪み
との関係を示す波形図であり、図４〔１〕がコイル電
流、図４〔２〕が磁歪振動子の歪みである。FIG. 4 is a waveform diagram showing the relationship between the coil current and the distortion of the magnetostrictive vibrator according to the present invention, wherein FIG. 4 [1] shows the coil current and FIG. 4 [2] shows the distortion of the magnetostrictive vibrator.
【図５】従来における磁歪振動子の駆動装置を示す断面
図である。FIG. 5 is a sectional view showing a conventional driving device for a magnetostrictive vibrator.
【図６】従来におけるコイル電流と磁歪振動子の歪みと
の関係を示す波形図であり、図６〔１〕がコイル電流、
図６〔２〕が磁歪振動子の歪みである。FIG. 6 is a waveform diagram showing a relationship between a conventional coil current and distortion of a magnetostrictive vibrator, and FIG.
FIG. 6 [2] shows the distortion of the magnetostrictive vibrator.
１０ 駆動装置 １２ 磁歪振動子 １４ａ，１４ｂ ヨーク １６ 永久磁石 １８ コイル DESCRIPTION OF SYMBOLS 10 Drive device 12 Magnetostrictive oscillator 14a, 14b Yoke 16 Permanent magnet 18 Coil
Claims (3)
る二個のヨークと、これらのヨークの一方に一端部が接
するとともに当該ヨークの他方に他端部が接する永久磁
石と、前記ヨークの一方に一端部が接するとともに当該
ヨークの他方に他端部が接するコイルとを備えた磁歪振
動子の駆動装置。1. A magnetostrictive vibrator, two yokes sandwiching the magnetostrictive vibrator, a permanent magnet having one end in contact with one of the yokes and the other end in contact with the other of the yokes, and the yoke. And a coil whose one end is in contact with one of the two and whose other end is in contact with the other end of the yoke.
である、請求項１記載の磁歪振動子の駆動装置。2. The driving device for a magnetostrictive vibrator according to claim 1, wherein the magnetostrictive vibrator is a Tb-Dy-Fe alloy.
おいて、前記永久磁石によって前記磁歪振動子をその飽
和歪領域まで磁化しておき、前記コイルによって前記永
久磁石から出る磁束を制御する、磁歪振動子の駆動方
法。3. The driving device for a magnetostrictive vibrator according to claim 1, wherein the permanent magnet magnetizes the magnetostrictive vibrator up to its saturation strain region, and controls a magnetic flux emitted from the permanent magnet by the coil. Driving method of magnetostrictive vibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6363395A JP2616481B2 (en) | 1995-03-23 | 1995-03-23 | Driving device and driving method for magnetostrictive vibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6363395A JP2616481B2 (en) | 1995-03-23 | 1995-03-23 | Driving device and driving method for magnetostrictive vibrator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08257501A JPH08257501A (en) | 1996-10-08 |
| JP2616481B2 true JP2616481B2 (en) | 1997-06-04 |
Family
ID=13234955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6363395A Expired - Lifetime JP2616481B2 (en) | 1995-03-23 | 1995-03-23 | Driving device and driving method for magnetostrictive vibrator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2616481B2 (en) |
-
1995
- 1995-03-23 JP JP6363395A patent/JP2616481B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08257501A (en) | 1996-10-08 |
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