JPH02119582A - Ultrasonic motor - Google Patents
Ultrasonic motorInfo
- Publication number
- JPH02119582A JPH02119582A JP63271021A JP27102188A JPH02119582A JP H02119582 A JPH02119582 A JP H02119582A JP 63271021 A JP63271021 A JP 63271021A JP 27102188 A JP27102188 A JP 27102188A JP H02119582 A JPH02119582 A JP H02119582A
- Authority
- JP
- Japan
- Prior art keywords
- support member
- elliptical motion
- ultrasonic motor
- pressure
- vibrator
- 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
- 238000006243 chemical reaction Methods 0.000 claims abstract 2
- 239000000463 material Substances 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 241000963790 Beilschmiedia tawa Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000087 stabilizing 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】
［産業上の利用分野コ
本発明は、電子機器などに用いられる超音波モータに関
し、特にローター直径の小さい小型の超音波モータに関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic motor used in electronic equipment, and more particularly to a small ultrasonic motor with a small rotor diameter.
［従来の技術］
超音波モータは従来の電磁モータと比較して、低回転で
高いトルクが得られること、停止保持力を有すること、
電磁ノイズが小さいことなどの利点を有しており、カメ
ラのオートフォーカス用や自動車用パワーモータ等に使
用されている。[Prior Art] Compared to conventional electromagnetic motors, ultrasonic motors have the following advantages: high torque can be obtained at low rotation speeds, and they have a stopping power.
It has advantages such as low electromagnetic noise, and is used for camera autofocus, automobile power motors, etc.
第５図及び第６図は従来の超音波モータの構造を示す概
略図であり、リング上の小歯状の突起部を設けた金属板
５１の突起部の形成されている面の裏側に２枚の圧電セ
ラミックス円盤５２．５３を接着した構造のステーター
の上に、円盤状ローター５４を圧接した構造となってい
る圧電セラミックス円盤は、偶数等分に分極の向きが逆
向きとなっており、これら２枚の圧電セラミックス円盤
は分割角度の半分の角度だけずらして接着されている。FIGS. 5 and 6 are schematic diagrams showing the structure of a conventional ultrasonic motor, in which a metal plate 51 on which small tooth-like protrusions are provided on a ring is provided with two The piezoelectric ceramic disk has a structure in which a disk-shaped rotor 54 is pressed onto a stator having a structure in which two piezoelectric ceramic disks 52 and 53 are bonded together, and the polarization direction of the piezoelectric ceramic disk is opposite to that of an even number of equal parts. These two piezoelectric ceramic disks are glued together with a difference of half the dividing angle.
［発明が解決しようとする課題］
第５図から判るように従来の超音波モータにおいては、
ステータの超音波振動を平面的にローターに伝達してい
るため、駆動トルクを大きくするには、ステーター及び
ローターの直径を大きくする必要がある。その為、従来
の超音波モータの実用的な最小直径は２０〜３０ｍｍに
限定されていた。[Problem to be solved by the invention] As can be seen from Fig. 5, in the conventional ultrasonic motor,
Since the ultrasonic vibrations of the stator are transmitted to the rotor in a two-dimensional manner, in order to increase the driving torque, it is necessary to increase the diameters of the stator and rotor. Therefore, the practical minimum diameter of conventional ultrasonic motors has been limited to 20 to 30 mm.
そこで、本発明の技術的課題は、ローターの直径を小さ
くした小型の超音波モータを提供することにある。Therefore, a technical object of the present invention is to provide a small-sized ultrasonic motor with a reduced rotor diameter.
本発明の他の技術的課題は、ローターの直径として、２
０ｍｍ以下の超音波モータを提供することにある。Another technical problem of the present invention is that the diameter of the rotor is 2
An object of the present invention is to provide an ultrasonic motor with a diameter of 0 mm or less.
〔課題を解決するための手段］
本発明によれば、端部の断面形状が円形で、この端部が
円を含む楕円運動を行う棒状圧電楕円運動振動子と、こ
の端部間の中心に対して対称的位置にある振動の節に設
けられた支持部材と、この端部の少なくとも一方に配さ
れた楕円運動一回転変換部材と、この支持部材を介して
この棒状圧電楕円運動振動子を支持する外枠と、この外
枠内に挿入されこの楕円運動一回転変換部材を回転可能
に支持する軸受けとを有し、この端部の円を含む楕円運
動を該楕円運動−回転変換部材を介して回転出力を得る
超音波モータにおいて、
前記支持部材をこの端部側より支持する円筒部材を設け
るとともに、この支持部材とこの外枠間に介在し、この
支持部材を押圧する加圧機構を設けたことを特徴とする
超音波モータが得られる。[Means for Solving the Problems] According to the present invention, a rod-shaped piezoelectric elliptical motion vibrator whose end portions have a circular cross-sectional shape and whose end portions perform elliptical motion including a circle; A support member provided at a vibration node located symmetrically with respect to the vibration node, an elliptic motion one-rotation converting member disposed at at least one of the ends of the support member, and a rod-shaped piezoelectric elliptic motion vibrator via the support member. It has a supporting outer frame and a bearing that is inserted into the outer frame and rotatably supports this elliptic motion one rotation converting member, and converts the elliptical motion including the circle at the end to the elliptical motion-rotation converting member. In the ultrasonic motor that obtains rotational output through the ultrasonic motor, a cylindrical member is provided to support the support member from the end side thereof, and a pressure mechanism is provided between the support member and the outer frame to press the support member. An ultrasonic motor characterized by the following features is obtained.
［作 用］
本発明の超音波モータにおいては、圧電楕円運動振動子
は直流電圧を印加して分極して歪みを与え、予め定めら
れた部分にこの棒状圧電楕円運動振動子の共振周波数に
等しい交流電圧を印加し、長さ方向に沿う一面内で屈曲
振動を発生させる。[Function] In the ultrasonic motor of the present invention, the piezoelectric elliptical motion oscillator is polarized by applying a DC voltage to give distortion, and a predetermined portion has a resonance frequency equal to the resonance frequency of this rod-shaped piezoelectric elliptical motion oscillator. An alternating current voltage is applied to generate bending vibration in one plane along the length direction.
また、同様にして、上記と異なる部分にこの棒状圧電楕
円運動振動子の共振周波数に等しい周波数の交流電圧を
印加して、長さ方向に沿う他の面内で先の屈曲振動の方
向と交差する屈曲振動を励振させる。２つの方向の屈曲
振動の位相をずらせる（好ましくは９０”）、具体的に
は夫々の交流電圧の位相をずらせる（好ましくは９０°
）ことにより、棒状圧電楕円運動振動子の両端部に、円
運動を含む楕円運動が励起することが可能である。Similarly, an alternating current voltage with a frequency equal to the resonance frequency of this rod-shaped piezoelectric elliptical motion vibrator is applied to a different part from the above, and it intersects the direction of the previous bending vibration in another plane along the length direction. Excite bending vibration. Shifting the phase of the bending vibrations in the two directions (preferably by 90"), specifically shifting the phase of the respective AC voltages (preferably by 90")
), it is possible to excite elliptical motion including circular motion at both ends of the rod-shaped piezoelectric elliptical motion vibrator.
この楕円運動は棒状圧電楕円運動振動子の少なくとも一
端に配されたこの棒状圧電楕円運動振動子の長さ方向に
突出した回転軸を有するカップ状ローラー等の楕円運動
一回転変換部材により、回転運動に変換される。このと
き、カップ状ローラーに接触する棒状圧電セラミックス
端部の圧力を一定にするために、支持部材を押圧する加
圧機構と、支持部材をこの棒状圧電セラミックスの端部
側より支持する円筒部材を設けたために圧電楕円運動振
動子端部の接触圧を一定に保つことができるとともに安
定した回転速度及び回転トルクを得ることができる。This elliptical motion is achieved by an elliptic motion one-turn converting member such as a cup-shaped roller having a rotating shaft protruding in the length direction of the rod-shaped piezoelectric elliptic motion oscillator, which is disposed at at least one end of the rod-shaped piezoelectric elliptic motion oscillator. is converted to At this time, in order to keep the pressure constant at the end of the rod-shaped piezoelectric ceramic that contacts the cup-shaped roller, a pressure mechanism that presses the support member and a cylindrical member that supports the support member from the end of the rod-shaped piezoelectric ceramic are provided. Because of this provision, the contact pressure at the end of the piezoelectric elliptical motion vibrator can be kept constant, and stable rotational speed and rotational torque can be obtained.
［実施例］ 以下本発明の超音波モータについて、詳しく説明する。[Example] The ultrasonic motor of the present invention will be explained in detail below.
第１図は本発明の超音波モータの構造例を示す断面図で
ある。この図において、超音波モータは、圧電楕円運動
振動子１０と、支持枠１１．１１−と、回転ローラー１
２．１２−と、振動子位置設定用バイブ１７，１７−と
、軸受け１４．１４−と、バネ材１３と、外枠１６と、
加圧調節ネジ１５とによって構成されている。FIG. 1 is a sectional view showing a structural example of an ultrasonic motor according to the present invention. In this figure, the ultrasonic motor includes a piezoelectric elliptical motion vibrator 10, a support frame 11.11-, and a rotating roller 1.
2.12-, vibrator position setting vibrator 17, 17-, bearing 14.14-, spring material 13, outer frame 16,
It is constituted by a pressure adjustment screw 15.
第２図は本発明の超音波モータに用いる棒状圧電楕円運
動振動子〕０の構造例を示す図である。FIG. 2 is a diagram showing an example of the structure of the rod-shaped piezoelectric elliptical motion vibrator]0 used in the ultrasonic motor of the present invention.
この図において、棒状の圧電楕円運動振動子１０は、正
多角形断面又は円形断面形状を有する棒状の圧電セラミ
ックスを有し、この棒状の圧電セラミックスの側面に沿
って複数の電極を設けられている。この棒状圧電楕円運
動振動子１０の両端間の中心に対して対称的な位置にあ
る振動の節の部分が支持枠１１．１１−で支持されてい
る。In this figure, a rod-shaped piezoelectric elliptic motion vibrator 10 has a rod-shaped piezoelectric ceramic having a regular polygonal or circular cross-section, and a plurality of electrodes are provided along the side surface of this rod-shaped piezoelectric ceramic. . Vibration node portions located symmetrically with respect to the center between both ends of the rod-shaped piezoelectric elliptic motion vibrator 10 are supported by support frames 11.11-.
第３図は本発明の超音波モータの構成原理の説明図であ
り、円を含む楕円運動をする棒状圧電楕円運動振動子１
０の両端部に回転ローラー１２゜１２′が圧接されてい
る。FIG. 3 is an explanatory diagram of the principle of construction of the ultrasonic motor of the present invention, in which a rod-shaped piezoelectric elliptical motion vibrator 1 makes an elliptical motion including a circle.
Rotating rollers 12° and 12' are pressed against both ends of the roller.
第４図は本発明の超音波モータにおいて、振動子の端部
と、回転ローラー１２．１２−との接触を安定にするた
めの加圧機構の構造を示す斜視図である。この図におい
て、２つの支持具に跨るようにバネ材１３が装若されて
いる。回転ローラー１２．１１”は図示しない軸受けに
より回転自在に支持される。第１図で示したように、回
転ローラー１２．１２−と圧電楕円運動振動子の１０の
端部は、支持具１１．１１−に固定されたバネキ４１３
により一定圧力で加圧される。さらに、このバネ材の加
圧力の強さは、加圧力調節ネジ１５を調節することによ
って、容易に調節することが可能である。FIG. 4 is a perspective view showing the structure of a pressure mechanism for stabilizing the contact between the end of the vibrator and the rotating roller 12, 12- in the ultrasonic motor of the present invention. In this figure, the spring member 13 is mounted so as to straddle the two supports. The rotating roller 12.11'' is rotatably supported by a bearing (not shown). As shown in FIG. Spring spring 413 fixed to 11-
Pressurized at a constant pressure. Furthermore, the strength of the pressing force of this spring material can be easily adjusted by adjusting the pressing force adjustment screw 15.
以上の説明は回転ローラー１２．１２−を両端部に設け
た場合について行なったが、回転ローラー１２を圧電楕
円運動振動子一方の端部にのみ設けた場合も、同様にモ
ーターを構成することができる。Although the above explanation has been made for the case where the rotating rollers 12, 12- are provided at both ends, the motor can be constructed in the same way even when the rotating rollers 12 are provided only at one end of the piezoelectric elliptic motion vibrator. can.
［発明の効果］
以上説明したように、本発明によれば、加圧機構により
楕円運動一回転変換部材と、圧電楕円運動振動子端部の
接触圧力を一定に保つことが可能となり、回転速度及び
トルクの安定な超音波モータが得られる。[Effects of the Invention] As explained above, according to the present invention, it is possible to maintain a constant contact pressure between the elliptic motion one-rotation converting member and the end of the piezoelectric elliptic motion vibrator by the pressurizing mechanism, and the rotational speed An ultrasonic motor with stable torque and torque can be obtained.
更に、本発明の超音波モータにおいては、駆動力を発生
させるための振動子の形状が単純で、回転あるいは、楕
円運動振動を発生させるための２つの振動モードが同じ
屈曲振動であることから、構造が簡単になる。また、楕
円運動振動子として、棒状の振動子を使用しているため
、ローターの直径を小さくすることが容品で、ローター
直径の小さい超音波モータを得ることができる。モータ
の直径としては、必要なトルクによって変わるが、原理
的には、１０ｍｍ以下も可能である。Furthermore, in the ultrasonic motor of the present invention, the shape of the vibrator for generating the driving force is simple, and the two vibration modes for generating rotational or elliptical vibration are the same bending vibration. The structure becomes simpler. Furthermore, since a rod-shaped vibrator is used as the elliptical motion vibrator, it is convenient to reduce the diameter of the rotor, and an ultrasonic motor with a small rotor diameter can be obtained. The diameter of the motor varies depending on the required torque, but in principle, a diameter of 10 mm or less is also possible.
第１図は本発明の超音波モータの構造例を示す断面図、
第２図は本発明の超音波モータに用いる圧電楕円運動振
動子の構造例を示す図、第３図は本発明の超音波モータ
の構成原理の説明図、第４図は本発明の超音波モータに
おいて、加圧機構の構造を示す斜視図、第５図及び第６
図は従来の超音波モータの構造を示す概略図である。
図中１０は圧電楕円運動振動子、１１．１１−は支持枠
、１２．１１は回転ローラー １３はバネ材、１４．１
４−は軸受け、１５は加圧調節ネジ、１６は外枠、１７
．１７＝は振動子位置設定用バイブ、５１は金属板、５
２．５３は圧電セラミックス円盤である。
第１図
第２図
第４図
第５図
第６図
手わ２争市正書
自発）
昭和乙８年ρ
月）
口FIG. 1 is a sectional view showing an example of the structure of the ultrasonic motor of the present invention;
Fig. 2 is a diagram showing an example of the structure of a piezoelectric elliptical motion vibrator used in the ultrasonic motor of the present invention, Fig. 3 is an explanatory diagram of the principle of construction of the ultrasonic motor of the present invention, and Fig. 4 is an illustration of the ultrasonic wave of the present invention. In the motor, a perspective view showing the structure of the pressurizing mechanism, FIGS. 5 and 6
The figure is a schematic diagram showing the structure of a conventional ultrasonic motor. In the figure, 10 is a piezoelectric elliptical motion vibrator, 11.11- is a support frame, 12.11 is a rotating roller, 13 is a spring material, 14.1
4- is a bearing, 15 is a pressure adjustment screw, 16 is an outer frame, 17
．． 17= is a vibrator for setting the vibrator position, 51 is a metal plate, 5
2.53 is a piezoelectric ceramic disk. Fig. 1 Fig. 2 Fig. 4 Fig. 5 Fig. 6 (Tawa 2 War Ichi Seisho autograph) (Showa Otsu 8th month)
Claims (1)
振動子と、該端部間の中心に対して対称的位置にある振
動の節に設けられた支持部材と、該端部の少なくとも一
方に配された楕円運動−回転変換部材と、該支持部材を
介して該棒状圧電楕円運動振動子を支持する外枠と、該
外枠内に挿入され該楕円運動−回転変換部材を回転可能
に支持する軸受けとを有し、該端部の円を含む楕円運動
を該楕円運動−回転変換部材を介して回転出力を得る超
音波モータにおいて、 前記支持部材を該端部側より支持する円筒部材を設け
るとともに、該支持部材と該外枠間に介在し、該支持部
材を押圧する加圧機構を設けたことを特徴とする超音波
モータ。1. A rod-shaped piezoelectric elliptical motion vibrator whose ends perform elliptical motion including a circle, a support member provided at a vibration node located symmetrically with respect to the center between the ends, and at least one of the ends. an elliptic motion-rotation converting member arranged, an outer frame supporting the rod-shaped piezoelectric elliptic motion vibrator via the support member, and an outer frame inserted into the outer frame and rotatably supporting the elliptic motion-rotation converting member. an ultrasonic motor which obtains a rotational output from an elliptical motion including a circle at the end via the elliptical motion-to-rotation conversion member, the cylindrical member supporting the support member from the end side; What is claimed is: 1. An ultrasonic motor comprising: a pressing mechanism interposed between the supporting member and the outer frame to press the supporting member;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63271021A JP2724730B2 (en) | 1988-10-28 | 1988-10-28 | Ultrasonic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63271021A JP2724730B2 (en) | 1988-10-28 | 1988-10-28 | Ultrasonic motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02119582A true JPH02119582A (en) | 1990-05-07 |
| JP2724730B2 JP2724730B2 (en) | 1998-03-09 |
Family
ID=17494302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63271021A Expired - Lifetime JP2724730B2 (en) | 1988-10-28 | 1988-10-28 | Ultrasonic motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2724730B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5138885A (en) * | 1990-03-16 | 1992-08-18 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric-type pressure sensor |
-
1988
- 1988-10-28 JP JP63271021A patent/JP2724730B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5138885A (en) * | 1990-03-16 | 1992-08-18 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric-type pressure sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2724730B2 (en) | 1998-03-09 |
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