JPH02266880A - Ultrasonic actuator - Google Patents
Ultrasonic actuatorInfo
- Publication number
- JPH02266880A JPH02266880A JP1087241A JP8724189A JPH02266880A JP H02266880 A JPH02266880 A JP H02266880A JP 1087241 A JP1087241 A JP 1087241A JP 8724189 A JP8724189 A JP 8724189A JP H02266880 A JPH02266880 A JP H02266880A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- ultrasonic actuator
- elastic body
- cantilever beam
- ultrasonic
- 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
Links
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 3
- 238000002788 crimping Methods 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 abstract description 7
- 238000013021 overheating Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は、弾性体の振動により可動子を駆動する超音波
アクチュエータの改良に関するものであ【従来技術1
従来、超音波モータは、進行波型と定在波型に大別され
る。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an improvement in an ultrasonic actuator that drives a mover by vibration of an elastic body. It is roughly divided into type and standing wave type.
これら超音波モータの基本動作原理は、略楕円振動が励
起される超音波振動子に対して所定圧力で移動子を当接
させ、略楕円運動する各質点と移動子との摩擦力により
移動子を駆動するものであり、特開昭61−49670
号公報等に報告されている。その具体的構造を第4図及
び第5図にに示す。The basic operating principle of these ultrasonic motors is that a movable element is brought into contact with a predetermined pressure against an ultrasonic vibrator that excites approximately elliptical vibrations, and the friction force between each mass point moving approximately elliptically and the movable element is used to move the movable element. It is a device that drives the
It has been reported in the No. Its concrete structure is shown in FIGS. 4 and 5.
同図において、31及び32は励振用圧電振動子であり
、端子板41を正電極どうしではさんだ画成になってい
る。In the figure, 31 and 32 are excitation piezoelectric vibrators, which are defined by sandwiching a terminal plate 41 between positive electrodes.
該圧電振動子31及び32の負電極側をそれぞれ端子@
42ではさみ、その外側にアルミニウム座金2及び5を
重ね、さらに該アルミニウム座金5に設けられたボルト
穴にキャップボルト6を通し、ボルト6の先端を片持梁
1のネジ穴にしめ付けである、また前記圧電振動子3.
及び32にはリード線71及び7□を接続しである。圧
電振動子31及び3.に正弦波電圧を印加すると、振動
子31及び3□に厚み方向振動が生じ、その結果座金2
お上V5に縦振動が伝わり、片持梁1の台部12が振動
される。この台部1□は中心のネジ穴を通してボルト6
で締め付けているため、台部12に伝わった縦振動は台
部12の屈曲振動となり、梁に屈曲振動が生じる。梁1
は台部1.の溝1.に対して斜めに立っているので、台
部12が凹状になっていると梁1の自由端面は凹の内側
へ向かう力、すなわち第5図で示す矢印10.および1
0.方向に力を受ける。その結果梁1に捩り振動が生じ
るが、梁1を支えているボルト6が振動子の縦振動によ
って伸縮するので、梁1の自由端面に捩り振動と縦振動
とを合成した楕円運動をする。しかも楕円の横径は梁1
の中心では零、中心から離れる程大きくなり幅方向両側
で最大となるが、中心から離れる向きが逆になると楕円
運動第5図の矢印10および10□で示したように逆回
転する。The negative electrode sides of the piezoelectric vibrators 31 and 32 are connected to terminals @
42, stack the aluminum washers 2 and 5 on the outside, and then pass the cap bolt 6 through the bolt hole provided in the aluminum washer 5, and tighten the tip of the bolt 6 into the screw hole of the cantilever beam 1. , and the piezoelectric vibrator 3.
Lead wires 71 and 7□ are connected to and 32. Piezoelectric vibrators 31 and 3. When a sinusoidal voltage is applied to the oscillators 31 and 3□, vibration occurs in the thickness direction, and as a result, the washer 2
The longitudinal vibration is transmitted to the upper V5, and the base portion 12 of the cantilever beam 1 is vibrated. Pass the bolt 6 through the center screw hole on this base part 1□.
Since the beam is tightened, the longitudinal vibration transmitted to the base part 12 becomes a bending vibration of the base part 12, and bending vibration occurs in the beam. Beam 1
is the base part 1. Groove 1. Since it stands obliquely to the pedestal 12, if the platform 12 is concave, the free end surface of the beam 1 will receive a force directed toward the inside of the concave, that is, the arrow 10 shown in FIG. and 1
0. receive force in the direction. As a result, torsional vibration occurs in the beam 1, but since the bolt 6 supporting the beam 1 expands and contracts due to the longitudinal vibration of the vibrator, the free end surface of the beam 1 undergoes an elliptical motion that is a combination of torsional vibration and longitudinal vibration. Moreover, the horizontal diameter of the ellipse is 1 beam
It is zero at the center, and increases as the distance from the center increases, reaching a maximum on both sides in the width direction, but when the direction away from the center is reversed, the elliptic motion rotates in the opposite direction as shown by arrows 10 and 10□ in FIG.
[発明が解決しようとする課題]
しかしながら、前述のように超音波アクチエエータは摩
擦力を駆動源としているために、エネルギロスのほとん
どが熱に変換され、その結果、たとえば過負荷時にはア
クチュエータが過熱するだけでなく、励振源に圧電素子
が用いられた場合には、温度上昇のため該圧電素子の性
能を着しく劣化するという問題があった。[Problems to be Solved by the Invention] However, as mentioned above, since the ultrasonic actuator uses frictional force as its driving source, most of the energy loss is converted to heat, and as a result, for example, the actuator overheats when overloaded. In addition, when a piezoelectric element is used as an excitation source, there is a problem in that the performance of the piezoelectric element is seriously deteriorated due to temperature rise.
[発明の目的]
本発明は、上述した問題、αを解決するためになされた
ものであり、弾性体と可動子の摩擦熱過負荷時等のため
に超音波7クチユエータの温度が上昇した時に、ある設
定温度において温度調整部が形状変化し、該超音波アク
チュエータの駆動を停止することにより、過熱を防止し
て圧電素子あるいは接触面の永久劣化を回避する超音波
モータを提供することを目的としている。[Purpose of the Invention] The present invention has been made to solve the above-mentioned problem α. An object of the present invention is to provide an ultrasonic motor that prevents overheating and avoids permanent deterioration of piezoelectric elements or contact surfaces by changing the shape of a temperature adjustment part at a certain set temperature and stopping the drive of the ultrasonic actuator. It is said that
[課題を解決するための手段]
この目的を達成するために本発明の超音波アクチュエー
タは、超音波振動を行なう弾性体と、該弾性体の振動エ
ネルギを駆動源とし、該弾性体に圧着した可動子とを有
する超音波アクチュエータにおいて、少なくとも前記弾
性体又は前記可動子の一部に前記圧着部の温度上昇によ
り前記弾性体を前記可動子とが接触しなくなるよう作用
する温度調整部を設けた。[Means for Solving the Problems] In order to achieve this object, the ultrasonic actuator of the present invention includes an elastic body that performs ultrasonic vibration, and a drive source using the vibration energy of the elastic body, and an ultrasonic actuator that is crimped to the elastic body. In the ultrasonic actuator having a movable element, at least a part of the elastic body or the movable element is provided with a temperature adjusting part that acts so that the elastic body is no longer in contact with the movable element due to an increase in temperature of the crimping part. .
[作用]
上記の構成を有する本発明の超音波アクチエエータにお
いて、少なくとも前記弾性体又は前記可動子の一部に設
けられた温度によって形状変化する温度調整部により設
定温度において7クチユエータの駆動が停止させられる
ので、該アクチエエータの過熱防止が容易に実現できる
。[Function] In the ultrasonic actuator of the present invention having the above configuration, the drive of the seven actuators is stopped at a set temperature by a temperature adjusting section whose shape changes depending on the temperature, which is provided in at least a part of the elastic body or the movable element. Therefore, overheating of the actuator can be easily prevented.
[実施例]
以下、本発明を具体化した一実施例を第1図から第3図
を参照して説明する。[Example] Hereinafter, an example embodying the present invention will be described with reference to FIGS. 1 to 3.
第1図は本実施例の超音波アクチエエータの側面図、第
2図は本実施例の上面図である。また、第39図は本実
施例の動作説明図を示している。同図において、第4図
及び第5図と同じ符号の付された各部材は、同様である
事を意味している。FIG. 1 is a side view of the ultrasonic actuator of this embodiment, and FIG. 2 is a top view of this embodiment. Further, FIG. 39 shows an explanatory diagram of the operation of this embodiment. In this figure, each member given the same reference numeral as in FIGS. 4 and 5 means the same thing.
片持梁1の下面とアルミニウム座金2の上面の間には、
該片持梁1の一部に、形状記憶合金より成り常温におい
てくの字形状の調整部20、及び202が形成されてい
る。Between the lower surface of the cantilever beam 1 and the upper surface of the aluminum washer 2,
A portion of the cantilever beam 1 is formed with adjusting portions 20 and 202 which are made of a shape memory alloy and have a dogleg shape at room temperature.
該温度調整部20、及び202は、設定温度Tでは上記
くの字形状を有し、設定温度Tを越えると図中下部方向
へ伸長するようあらかじめ調整されている。The temperature adjusting sections 20 and 202 are adjusted in advance so that they have the above-mentioned dogleg shape at the set temperature T, and expand toward the bottom in the figure when the set temperature T is exceeded.
以上のように構成された超音波7クチユエータの作用を
第3図を参照して以下に説明する。同図において、振動
子の下部は省略して書いである。The operation of the ultrasonic 7-cut unit configured as described above will be explained below with reference to FIG. In the figure, the lower part of the vibrator is omitted.
第3図(a)の状態にある超音波アクチエエータに交流
電気信号を印加して駆動すると、前記片持梁1の下面と
前記アルミニウム座金2の上面の摩擦により、摩擦熱が
発生する。該摩擦熱は、前記片持梁1中を伝わり、前記
温度調整部20.及び202を加熱する。該温度il!
整部20.及び20゜の温度が前記設定温度Tを越える
と、該温度119部20.及び202が図中下部方向へ
伸長し、前記片持梁1が変形するため、前記片持梁1と
前記アルミニウム座金2の接触がなくなり、超音波アク
チュエータは停止する。When an AC electric signal is applied to drive the ultrasonic actuator in the state shown in FIG. 3(a), friction between the lower surface of the cantilever beam 1 and the upper surface of the aluminum washer 2 generates frictional heat. The frictional heat is transmitted through the cantilever beam 1 and the temperature adjusting section 20. and 202 is heated. The temperature il!
Orthopedic department 20. and when the temperature of 20° exceeds the set temperature T, the temperature 119 parts 20. and 202 extend toward the bottom in the figure, and the cantilever beam 1 is deformed, so the contact between the cantilever beam 1 and the aluminum washer 2 is lost, and the ultrasonic actuator stops.
なお、上記実施例は回転型超音波モータを例にとり説明
したが、これに限定されるものではなく、直線駆動型超
音波モータなどの7クチエエータにも実施可能である。Although the above embodiment has been described using a rotary ultrasonic motor as an example, the present invention is not limited to this, and can also be implemented with a seven-actuator such as a linear drive ultrasonic motor.
また、実施例では温度調整部の形状をくの字形状とする
例について説明したが、コイルバネ形状等、本発明の趣
旨を逸脱しない範囲で種々の変形が可能である。Further, in the embodiment, an example in which the shape of the temperature adjustment section is a dogleg shape has been described, but various modifications such as a coil spring shape are possible without departing from the spirit of the present invention.
[発明の効果1
以上詳述したことから明らかなように、本発明によれば
、温度によって形状変化する材質及び形状より成る温度
調整部を設け、超音波アクチエエータの温度が設定温度
以上になった時に、該超音波アクチュエータの駆動を停
止するよう構成されているので、過熱を防止し、圧電素
子あるいは接触面の永久劣化を回避する超音波アクチエ
エータを得ることができる。[Effects of the Invention 1] As is clear from the detailed description above, according to the present invention, a temperature adjustment section made of a material and shape whose shape changes depending on the temperature is provided, and the temperature of the ultrasonic actuator becomes equal to or higher than the set temperature. Since the ultrasonic actuator is configured to stop driving at times, it is possible to obtain an ultrasonic actuator that prevents overheating and avoids permanent deterioration of the piezoelectric element or the contact surface.
第1図から第合図までは本発明を具体化した実施例を示
すもので、第1図1上本発明の超音波アクチエエータの
側面図であり、第2図はその上面図であり、第3図はそ
の動作説明図であり、第4図及び第5図は従来例を示す
図である。
1・・・片持梁、2・・・アルミニウム座金、20+〜
2・・・温度調整部。1 to 3 show embodiments embodying the present invention, FIG. 1 is a side view of the ultrasonic actuator of the present invention, FIG. 2 is a top view thereof, and FIG. The figure is an explanatory diagram of its operation, and FIGS. 4 and 5 are diagrams showing a conventional example. 1...Cantilever beam, 2...Aluminum washer, 20+~
2...Temperature adjustment section.
Claims (2)
した可動子とを有する超音波アクチュエータにおいて、 少なくとも前記弾性体又は前記可動子の一部に前記圧着
部の温度上昇により前記弾性体を前記可動子とが接触し
なくなるよう作用する温度調整部を設けたことを特徴と
する題音波アクチュエータ。1. An ultrasonic actuator comprising an elastic body that performs ultrasonic vibration, and a movable element that uses the vibration energy of the elastic body as a driving source and is crimped to the elastic body, the crimping being applied to at least a part of the elastic body or the movable element. 1. The sonic actuator according to the present invention, further comprising a temperature adjusting section that acts to cause the elastic body to come out of contact with the movable element due to an increase in temperature of the sonic actuator.
る超音波アクチュエータ。2. The ultrasonic actuator according to claim 1, wherein the temperature adjustment section is formed of a shape memory alloy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1087241A JPH02266880A (en) | 1989-04-06 | 1989-04-06 | Ultrasonic actuator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1087241A JPH02266880A (en) | 1989-04-06 | 1989-04-06 | Ultrasonic actuator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02266880A true JPH02266880A (en) | 1990-10-31 |
Family
ID=13909319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1087241A Pending JPH02266880A (en) | 1989-04-06 | 1989-04-06 | Ultrasonic actuator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02266880A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10014746B2 (en) * | 2013-04-02 | 2018-07-03 | Asmo Co., Ltd. | Rotary electric machine and method of manufacturing rotary electric machine |
-
1989
- 1989-04-06 JP JP1087241A patent/JPH02266880A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10014746B2 (en) * | 2013-04-02 | 2018-07-03 | Asmo Co., Ltd. | Rotary electric machine and method of manufacturing rotary electric machine |
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