JP2615871B2 - Ultrasonic motor - Google Patents
Ultrasonic motorInfo
- Publication number
- JP2615871B2 JP2615871B2 JP63161746A JP16174688A JP2615871B2 JP 2615871 B2 JP2615871 B2 JP 2615871B2 JP 63161746 A JP63161746 A JP 63161746A JP 16174688 A JP16174688 A JP 16174688A JP 2615871 B2 JP2615871 B2 JP 2615871B2
- Authority
- JP
- Japan
- Prior art keywords
- elastic body
- ultrasonic motor
- lining material
- projection
- present
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、圧電体等の電気−機械変換振動子を用いて
駆動力を発生する超音波モータに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic motor that generates a driving force using an electromechanical transducer such as a piezoelectric body.
従来の技術 従来のこの種の圧電体等の電気−機械変換振動子を用
いた超音波モータは、第３図のような構成になってい
た。すなわち、２つの円形の圧電体振動子1,2と円形の
弾性体３とを厚み方向に重ねてステータ４を構成し、弾
性体３の表面には振動エネルギーを作用させるための略
リング状の振動伝達部である突起3aを有しており、この
突起3aの面粗度は一様に2S〜3S以下に仕上げられてい
る。その突起3aに面接触する円形のライニング材４とラ
イニング材４を取付けた移動体５とでロータ６を構成
し、圧電体振動子1,2に互いに位相のずれた電気信号を
印加することにより、ロータ６へ回転力を伝えるように
なっている。2. Description of the Related Art A conventional ultrasonic motor using an electromechanical transducer such as a piezoelectric body of this type has a configuration as shown in FIG. That is, a stator 4 is formed by stacking two circular piezoelectric vibrators 1 and 2 and a circular elastic body 3 in the thickness direction, and a substantially ring-shaped surface for applying vibration energy to the surface of the elastic body 3. It has a projection 3a as a vibration transmitting section, and the surface roughness of the projection 3a is uniformly finished to 2S to 3S or less. A rotor 6 is constituted by a circular lining member 4 that comes into surface contact with the projection 3a and a moving body 5 having the lining member 4 attached thereto, and by applying electric signals to the piezoelectric vibrators 1 and 2 out of phase with each other. , And transmits a rotational force to the rotor 6.
なお、ライニング材４は多孔性部材で形成しており、
突起3aと接触するライニング材４の面を多孔性（ポーラ
ス）にしている。In addition, the lining material 4 is formed of a porous member,
The surface of the lining material 4 that is in contact with the projection 3a is made porous.
発明が解決しようとする課題 しかしこのような従来構造の超音波モータでは、弾性
体３上の突起3aの面粗度が一様であり駆動時の経時変化
により、ライニング材４より発生する摩耗粉がライニン
グ材４の表面のポーラス部分に入り込み、目詰まりを起
こしてしまい、ライニング材４の接触表面が均一にな
る。そのためスチックスリップ現象がおこり、駆動力が
減少するとともに「鳴き音」が発生しはじめるという問
題点を有していた。However, in the ultrasonic motor having such a conventional structure, the surface roughness of the projections 3a on the elastic body 3 is uniform, and the wear powder generated from the lining material 4 due to a temporal change during driving. Enters the porous portion of the surface of the lining material 4 and causes clogging, so that the contact surface of the lining material 4 becomes uniform. For this reason, there was a problem that a stick-slip phenomenon occurred, a driving force was reduced, and a "squeal" began to be generated.
本発明はこのような課題を解決するもので、弾性体の
突起と接触するライニング材表面のポーラス部分に目詰
りをおこさない超音波モータを提供するものである。The present invention has been made to solve such a problem, and an object of the present invention is to provide an ultrasonic motor that does not cause clogging of a porous portion on a surface of a lining material that contacts a projection of an elastic body.
課題を解決するための手段 上述した従来の課題を解決するために本発明は、ライ
ニング材と接触する弾性体の振動伝達部の接触面を一部
分を他の接触面よりも表面粗さを粗くするものである。Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention is to make a part of a contact surface of a vibration transmission part of an elastic body that comes into contact with a lining material rougher than other contact surfaces. Things.
作用 上記構成によれば、弾性体の振動伝達部の一部分の表
面粗さが粗いため、駆動時にこの部分でライニング材の
表面を軽く削ることができる。そのため、ライニング材
の表面を常に更新することができ、常に表面にポーラス
部分を残すことができる。このため、ライニング材表面
のポーラス部分の目詰りによるスリップと「鳴き音」の
発生を防止できる。Operation According to the above configuration, since the surface roughness of a portion of the vibration transmitting portion of the elastic body is rough, the surface of the lining material can be lightly shaved at this portion during driving. Therefore, the surface of the lining material can be constantly updated, and a porous portion can always be left on the surface. For this reason, it is possible to prevent the occurrence of slip and “squeal” due to clogging of the porous portion on the lining material surface.
実施例 以下、本発明の一実施例を第１図及び第２図にもとづ
いて説明する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
なお、従来と同じ構成の部分については従来例（第３
図）と同じ符号を付し、その説明を省略する。In addition, about the part of the structure same as a conventional, the conventional example (3rd
The same reference numerals as in FIG.
第１図は弾性体３の斜視図であり、この弾性体３には
振動伝達部である複数個の突起3aをリング状に配置して
いる。この突起3aのうち一部分3a′のものは第２図に示
すように突起表面をスライス（スライス表面3b）もしく
は研磨（研磨面3c）にて表面粗さを粗くしている。他の
突起3aの表面は従来と同じ粗さ（2S〜3S）にしている。
次に、従来の突起表面を一様に仕上げたものと、本実施
例における一部分の突起表面の表面粗さを粗くしたもの
を使用した超音波モータのそれぞれのライニング材と弾
性体の突起との「鳴き音」の発生状況実験結果を表に示
す。回転数は100rpmとした。FIG. 1 is a perspective view of the elastic body 3, on which a plurality of protrusions 3a, which are vibration transmitting portions, are arranged in a ring shape. As shown in FIG. 2, the surface of the projection 3a is partially roughened by slicing (slicing surface 3b) or polishing (polished surface 3c) the surface 3a '. The surface of the other projections 3a has the same roughness (2S to 3S) as the conventional one.
Next, each of the conventional lining material and the projection of the elastic body of the ultrasonic motor using the finished surface of the projection uniformly and the surface roughness of a part of the projection surface in the present embodiment was used. The table below shows the experimental results of the "squealing sound". The rotation speed was 100 rpm.
表に示すように従来品は10時間を過ぎると「鳴き音」
が発生したが、本発明によるものは200時間に至るまで
「鳴き音」は発生したなった。 As shown in the table, conventional products "squeak" after 10 hours
However, according to the present invention, a "squeal" was generated up to 200 hours.
なお、表面粗さが粗くなりすぎると、摩耗量が多くな
りモータの寿命が短くなる。「鳴き音」を防止し、かつ
モータ寿命を長くするには5S〜10Sが最適と考えられ
る。If the surface roughness is too rough, the amount of wear increases and the life of the motor is shortened. It is considered that 5S to 10S is optimal to prevent "squeal" and extend the life of the motor.
発明の効果 以上の説明から明らかなように本発明は、弾性体の振
動伝達部の一部分の表面粗さを他の部分よりも粗くした
ため、ライニング材の表面に、常にポーラス部分を露出
できる。そのため、スリップを防止でき、駆動力のロス
を減少できるとともに「鳴き音」の発生を防止できる。Effects of the Invention As is apparent from the above description, in the present invention, the surface roughness of a portion of the vibration transmitting portion of the elastic body is made larger than that of the other portion, so that the porous portion can always be exposed on the surface of the lining material. Therefore, slip can be prevented, loss of driving force can be reduced, and generation of “squeal” can be prevented.
第１図は本発明の一実施例における弾性体の斜視図、第
２図（ａ），（ｂ）は同弾性体の一部拡大図、第３図は
従来の超音波モータの断面図である。 ３……弾性体、3a……弾性体の突起、3b……スライス表
面、3c……研磨面。FIG. 1 is a perspective view of an elastic body in one embodiment of the present invention, FIGS. 2 (a) and 2 (b) are partially enlarged views of the elastic body, and FIG. 3 is a sectional view of a conventional ultrasonic motor. is there. 3 ... elastic body, 3a ... elastic body projection, 3b ... slice surface, 3c ... polished surface.
Claims (1)
ステータと、そのステータの弾性体に形成した振動伝達
部に接触するライニング材を有するロータとを備え、前
記ライニング材と接触する弾性体の振動伝達部の接触面
の一部分を他の接触面よりも表面粗さを粗くした超電波
モータ。A stator having an elastic body and an electro-mechanical transducer; and a rotor having a lining material that contacts a vibration transmitting portion formed on the elastic body of the stator. An ultrasonic motor in which a part of the contact surface of the vibration transmission part of the body has a higher surface roughness than other contact surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63161746A JP2615871B2 (en) | 1988-06-29 | 1988-06-29 | Ultrasonic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63161746A JP2615871B2 (en) | 1988-06-29 | 1988-06-29 | Ultrasonic motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0213279A JPH0213279A (en) | 1990-01-17 |
| JP2615871B2 true JP2615871B2 (en) | 1997-06-04 |
Family
ID=15741100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63161746A Expired - Fee Related JP2615871B2 (en) | 1988-06-29 | 1988-06-29 | Ultrasonic motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2615871B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256928A (en) * | 1990-10-26 | 1993-10-26 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic motor with a vibrator having recesses |
| JPH10191658A (en) * | 1996-01-09 | 1998-07-21 | Nikon Corp | Vibration actuator |
-
1988
- 1988-06-29 JP JP63161746A patent/JP2615871B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0213279A (en) | 1990-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |