JPH0640748B2 - Ultrasonic vibration motor - Google Patents
Ultrasonic vibration motorInfo
- Publication number
- JPH0640748B2 JPH0640748B2 JP61048300A JP4830086A JPH0640748B2 JP H0640748 B2 JPH0640748 B2 JP H0640748B2 JP 61048300 A JP61048300 A JP 61048300A JP 4830086 A JP4830086 A JP 4830086A JP H0640748 B2 JPH0640748 B2 JP H0640748B2
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- vibrator
- ultrasonic vibration
- disc member
- vibration motor
- 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
Links
- 230000005284 excitation Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/16—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors using travelling waves, i.e. Rayleigh surface waves
- H02N2/163—Motors with ring stator
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、超音波振動により振動子の表面に発生する進
行波を、該振動子に加圧接触させた動体（回転子）の一
方向回転運動に変換する超音波振動モータに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to one direction of a moving body (rotor) in which a traveling wave generated on the surface of a vibrator by ultrasonic vibration is brought into pressure contact with the vibrator. The present invention relates to an ultrasonic vibration motor that converts into rotary motion.
第２図は従来の超音波振動モータを示すものである（特
開昭５８−１４８６８２号公報参照）。この図におい
て、１，２はケーシングであり、該ケーシング１，２に
はリング状の振動子３が固定され、該振動子３にはネジ
４によって回転子５が加圧接触されている。振動子３は
金属弾性体であって、第３図、第４図に示すようなリン
グ形状をなしており、回転子の接触面と反対側の面には
超音波振動を発生する振動源としての圧電素子（図示せ
ず）が複数組込まれ、その振動によって回転子５との接
触面には振動周波数に応じた速度でリング状の表面を移
動する進行波が発生する。他方、この振動子３に加圧接
触される回転子５は、第５図、第６図に示すように振動
子３に接触する接触フランジ部７と回転軸６に固定され
た円板部８とからなり、その接触フランジ部７が振動子
３表面に生ずる進行波によって摩擦されて回転するよう
になっている。尚、９，１０は軸受である。FIG. 2 shows a conventional ultrasonic vibration motor (see Japanese Patent Application Laid-Open No. 58-148682). In this figure, reference numerals 1 and 2 denote casings. A ring-shaped vibrator 3 is fixed to the casings 1 and 2, and a rotor 5 is pressed against the vibrator 3 by a screw 4. The vibrator 3 is a metal elastic body and has a ring shape as shown in FIGS. 3 and 4, and serves as a vibration source for generating ultrasonic vibration on the surface opposite to the contact surface of the rotor. A plurality of piezoelectric elements (not shown) are incorporated, and the vibration thereof generates a traveling wave that moves on the ring-shaped surface at a speed corresponding to the vibration frequency on the contact surface with the rotor 5. On the other hand, the rotor 5 that is pressed into contact with the vibrator 3 includes a contact flange portion 7 that contacts the vibrator 3 and a disk portion 8 fixed to the rotary shaft 6 as shown in FIGS. 5 and 6. The contact flange portion 7 is rotated by being rubbed by the traveling wave generated on the surface of the vibrator 3. Incidentally, 9 and 10 are bearings.
かかる超音波振動モータは、直流モータの特性に近い高
い制御性を持っており、また従来の電磁モータに比べて
小型、強力、高効率である等の特徴を持っている。Such an ultrasonic vibration motor has high controllability close to the characteristics of a DC motor, and has features such as smaller size, higher strength, and higher efficiency than conventional electromagnetic motors.
ところで、かかる超音波振動モータは回転子を振動子に
圧接した状態で回転力を得るものであるため、圧電素子
等の振動源の高周波励振をＯＦＦにした場合にも回転子
は振動子に相当な接触圧で接しており、その結果、回転
子が固定されている回転軸は回転不能な拘束状態にあ
る。このため、モータのＯＦＦ状態において回転軸があ
る程度以上に回転可能な状態にあった方が良いとされる
個所には、このような超音波振動モータを適用できない
ことになる。例えば、電動式ドアミラーに用いるモータ
の回転軸は衝撃緩和のためにも回転可能な状態になけれ
ばならない。またスロットルチャンバのような部分には
フェールセーフのためにも回転軸が回転自在の状態にあ
るモータが使用されるべきである。By the way, since such an ultrasonic vibration motor obtains a rotational force in a state where the rotor is pressed against the vibrator, the rotor is equivalent to the vibrator even when the high frequency excitation of the vibration source such as the piezoelectric element is turned off. Are in contact with each other with a large contact pressure, and as a result, the rotating shaft to which the rotor is fixed is in a non-rotatable restrained state. For this reason, such an ultrasonic vibration motor cannot be applied to a portion where it is better that the rotary shaft can rotate to a certain extent or more in the OFF state of the motor. For example, the rotating shaft of a motor used in an electric door mirror must be in a rotatable state for shock absorption. In addition, a motor having a rotatable shaft in a freely rotatable state should be used in a portion such as the throttle chamber for failsafe.
そこで、本発明の課題は、振動源の高周波励振がＯＦＦ
状態にあるときに回転軸を回転可能な状態にする点にあ
る。Therefore, an object of the present invention is to turn off the high frequency excitation of the vibration source.
The point is to make the rotating shaft rotatable when in the state.
前記課題を達成して従来技術の問題点を解決するため、
本発明に係る超音波振動モータは第１図に示すように、
超音波振動を発生する振動源により進行波を発生させる
リング状の振動子３と、この振動子３に圧接され前記進
行波により回転して回転軸を回転させる回転子１５と、
前記回転子１５に固定された第１の円盤部材２２と、連
結体２４を介して第１の円盤部材２２と回転自在に連結
された第２の円盤部材２３と、この第２の円盤部材２３
を回転子１５側に付勢するための弾性体２５と、励磁に
より前記弾性体２５の付勢力に抗して第２の円盤部材２
３を吸引するクラッチコイル２１とを設けた。In order to achieve the above object and solve the problems of the conventional technology,
The ultrasonic vibration motor according to the present invention, as shown in FIG.
A ring-shaped vibrator 3 that generates a traveling wave by a vibration source that generates ultrasonic vibrations, and a rotor 15 that is pressed against the vibrator 3 and rotates by the traveling wave to rotate a rotating shaft.
A first disk member 22 fixed to the rotor 15, a second disk member 23 rotatably connected to the first disk member 22 via a connecting body 24, and the second disk member 23.
The elastic body 25 for urging the rotor 15 toward the rotor 15, and the second disk member 2 against the urging force of the elastic body 25 by excitation.
A clutch coil 21 for attracting 3 is provided.
第１図は本発明に係る超音波振動モータの一例を示すも
のである。FIG. 1 shows an example of an ultrasonic vibration motor according to the present invention.
同図において２１はクラッチコイル、２２は回転子１５
に固定された第１の円盤部材、２３は第２の円盤部材、
２４は円盤部材２２，２３を回転自在に連結する連結体
としてのボールベアリング、２５は第２の円盤部材２３
を回転子１５側に付勢するための弾性体としてのスプリ
ングである。尚、その他の部分は従来のものと同様であ
るから第１図と同一の番号を符して重複する説明を省略
する。In the figure, 21 is a clutch coil and 22 is a rotor 15.
A first disc member fixed to the second disc member 23, a second disc member 23,
Reference numeral 24 is a ball bearing as a connecting body for rotatably connecting the disk members 22 and 23, and 25 is a second disk member 23.
Is a spring as an elastic body for urging the rotor toward the rotor 15. Since the other parts are the same as the conventional ones, the same numbers as in FIG.
次に作用を説明する。Next, the operation will be described.
まずクラッチコイル２１が非励磁状態のときは、スプリ
ング２５が第２の円盤部材２３を回転子１５側に付勢
し、回転子１５を一定の接触圧で振動子３に圧接させ
る。ここで振動源としての圧電素子を励振させれば、振
動子３には進行波が生じて回転子１５が回転し、回転軸
６を回転させることになる。尚このとき、第２の円盤部
材２３はスプリング２５によって付勢されているために
回転しないが、ボールベアリング２４によって回転自在
に連結された第１の円盤部材２２は回転子１５とともに
回転することになる。First, when the clutch coil 21 is in the non-excited state, the spring 25 urges the second disk member 23 toward the rotor 15, and the rotor 15 is pressed against the vibrator 3 with a constant contact pressure. When the piezoelectric element as the vibration source is excited, a traveling wave is generated in the vibrator 3, the rotor 15 rotates, and the rotary shaft 6 rotates. At this time, the second disk member 23 does not rotate because it is biased by the spring 25, but the first disk member 22 rotatably connected by the ball bearing 24 rotates together with the rotor 15. Become.
次に、クラッチコイル２１が励磁されるとスプリング２
５の付勢力に抗して第２の円盤部材２３がクラッチコイ
ル２１に吸引され、振動子３への回転子１５の接触状態
を解除する。従って、回転子１５および回転軸６は回転
自由な状態となる。Next, when the clutch coil 21 is excited, the spring 2
The second disk member 23 is attracted to the clutch coil 21 against the biasing force of the rotor 5, and the contact state of the rotor 15 with the vibrator 3 is released. Therefore, the rotor 15 and the rotary shaft 6 are in a freely rotatable state.
以上説明したように、本発明に係る超音波振動モータに
よれば、回転子に固定された第１の円盤部材と、この第
１の円盤部材と回転自在に連結された第２の円盤部材
と、励磁により弾性体の付勢力に抗して第２の円盤部材
を吸引するクラッチコイルを設けた構成としたから、振
動子の非励振時には第２の円盤部材がクラッチコイルに
吸引されるので、確実に回転子と振動子との加圧が解除
され回転軸が自由に回転できることになる。As described above, according to the ultrasonic vibration motor of the present invention, the first disc member fixed to the rotor and the second disc member rotatably connected to the first disc member. Since the clutch coil that attracts the second disk member against the biasing force of the elastic body by excitation is provided, the second disk member is attracted to the clutch coil when the vibrator is not excited. The pressure applied to the rotor and the vibrator is reliably released, and the rotation shaft can freely rotate.
第１図は本発明の実施例を示す断面図、第２図は従来の
超音波振動モータを示す断面図、第３図は振動子の形状
を示す図、第４図は第３図のIV−IV線断面図、第５図は
回転子の形状を示す図、第６図は第５図のVI−VI線断面
図である。 １，２……ケーシング、３……振動子 ４……ネジ、５，１５……回転子 ６……回転軸、７……接触フランジ部 ８……円板部、９，１０……軸受 ２１……クラッチコイル、２２……第１の円盤部材 ２３……第２の円盤部材、２４……ボールベアリング ２５……スプリングFIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a conventional ultrasonic vibration motor, FIG. 3 is a view showing the shape of a vibrator, and FIG. 4 is a IV of FIG. -IV line sectional drawing, FIG. 5 is a figure which shows the shape of a rotor, FIG. 6 is a VI-VI sectional view taken on the line of FIG. 1, 2 ... Casing, 3 ... Transducer 4 ... Screw, 5, 15 ... Rotor 6 ... Rotating shaft, 7 ... Contact flange part 8 ... Disk part, 9, 10 ... Bearing 21 ...... Clutch coil, 22 ...... First disk member 23 ...... Second disk member, 24 ...... Ball bearing 25 ...... Spring
Claims (1)
を発生させるリング状の振動子と、 この振動子に圧接され前記進行波により回転して回転軸
を回転させる回転子と、 前記回転子に固定された第１の円盤部材と、 連結体を介して第１の円盤部材と回転自在に連結された
第２の円盤部材と、 この第２の円盤部材を回転子側に付勢するための弾性体
と、 励磁により前記弾性体の付勢力に抗して第２の円盤部材
を吸引するクラッチコイルとを設けたことを特徴とする
超音波振動モータ。1. A ring-shaped vibrator that generates a traveling wave by a vibration source that generates ultrasonic vibrations, a rotor that is pressed against the vibrator to rotate the rotating shaft by the traveling wave, and the rotation. A first disc member fixed to the child, a second disc member rotatably connected to the first disc member via a connecting body, and urging the second disc member to the rotor side. And a clutch coil for attracting the second disk member against the biasing force of the elastic body by excitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61048300A JPH0640748B2 (en) | 1986-03-07 | 1986-03-07 | Ultrasonic vibration motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61048300A JPH0640748B2 (en) | 1986-03-07 | 1986-03-07 | Ultrasonic vibration motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62207180A JPS62207180A (en) | 1987-09-11 |
| JPH0640748B2 true JPH0640748B2 (en) | 1994-05-25 |
Family
ID=12799582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61048300A Expired - Lifetime JPH0640748B2 (en) | 1986-03-07 | 1986-03-07 | Ultrasonic vibration motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0640748B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6489978A (en) * | 1987-09-28 | 1989-04-05 | Miki Pulley Kk | Supersonic motor |
| JPH0717277Y2 (en) * | 1987-11-02 | 1995-04-19 | 三木プーリ株式会社 | Ultrasonic motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59185180A (en) * | 1983-04-04 | 1984-10-20 | Canon Inc | Supersonic motor |
-
1986
- 1986-03-07 JP JP61048300A patent/JPH0640748B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62207180A (en) | 1987-09-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |