JP2694142B2 - Ultrasonic motor input control device - Google Patents
Ultrasonic motor input control deviceInfo
- Publication number
- JP2694142B2 JP2694142B2 JP63062775A JP6277588A JP2694142B2 JP 2694142 B2 JP2694142 B2 JP 2694142B2 JP 63062775 A JP63062775 A JP 63062775A JP 6277588 A JP6277588 A JP 6277588A JP 2694142 B2 JP2694142 B2 JP 2694142B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric body
- input control
- wavelength
- control device
- ultrasonic 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 - Fee Related
Links
- 230000010287 polarization Effects 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 1
- 230000009897 systematic effect 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
- H02N2/14—Drive circuits; Control arrangements or methods
-
- 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
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、圧電体により弾性体に進行波を生じさせて
ロータを回転させるようにした超音波モータの入力制御
装置において、超音波モータの駆動効率を良くした超音
波モータの入力制御装置に関するものである。Description: “Industrial application field” The present invention relates to an ultrasonic motor input control device in which a piezoelectric body generates a traveling wave in an elastic body to rotate a rotor. The present invention relates to an input control device for an ultrasonic motor with improved drive efficiency.
「従来の技術」 従来の超音波モータの入力制御装置を第２、３図によ
り説明する。"Prior Art" A conventional ultrasonic motor input control device will be described with reference to Figs.
弾性体１は外周が円形に形成され、その軸方向の一端
面に環状のアース電極２が取付けられ、アース電極２の
外面に環状の圧電体３が設けられ、さらにその外面に印
加電極４が配置される。なお、弾性体１を直接アースす
れば、アース電極２は不要になる。The elastic body 1 has a circular outer periphery, an annular ground electrode 2 is attached to one end surface in the axial direction, an annular piezoelectric body 3 is provided on the outer surface of the earth electrode 2, and an application electrode 4 is further provided on the outer surface thereof. Will be placed. If the elastic body 1 is directly grounded, the ground electrode 2 becomes unnecessary.
圧電体３は２組の半円弧状部に区分され、両区分の対
向する一方の端部間に、後記する圧電体の１分極部分の
1/2の巾（1/4波長）と、他方の端部間に後記する圧電体
の１分極部分の1/2の巾の1.5倍の巾（3/4波長）の間隔
が設けられる。そして、圧電体の各区分は、＋極と−極
とに交互に連続させて分極される。なお、圧電体の各分
極の巾は、圧電体の円の中心からの角が例えば25.71゜
となるようにされ、印加される高周波電圧の1/2波長の
長さとなっている。また、印加電極４は、圧電体３の２
区分に対応して分割され、それぞれの印加電極４に90゜
位相異なるcos電圧とsin電圧とが印加されるように、圧
電体の２つの区分の一方に印加電極４が高周波電源に直
接、そして他方に印加電圧４が移相器６を介して接続さ
れる。The piezoelectric body 3 is divided into two sets of semi-circular arc-shaped portions, and one end of one polarization portion of the piezoelectric body, which will be described later, is provided between the opposing one ends of both divisions.
An interval of 1/2 width (1/4 wavelength) and 1.5 times the width (3/4 wavelength) of 1/2 width of one polarization portion of the piezoelectric body described later is provided between the other ends. Then, each section of the piezoelectric body is alternately and continuously polarized with a positive pole and a negative pole. The width of each polarization of the piezoelectric body is such that the angle from the center of the circle of the piezoelectric body is, for example, 25.71 °, which is half the wavelength of the applied high frequency voltage. In addition, the application electrode 4 is the same as that of the piezoelectric body 3.
In order to apply a cos voltage and a sin voltage which are 90 ° out of phase to each of the application electrodes 4, the application electrode 4 is directly connected to the high frequency power source in one of the two sections of the piezoelectric body, and The applied voltage 4 is connected to the other via a phase shifter 6.
そして、印加電極４に高周波電圧が印加されると圧電
体３に振動が生じ、それにより弾性体１に進行波が生
じ、さらに弾性体１に圧接したロータ７が進行波を受け
て回転するようになっている。なお、圧電体３の直径は
45mmとし、ロータ７および弾性体１の直径も圧電体３に
対応したものとなっている。Then, when a high frequency voltage is applied to the application electrode 4, the piezoelectric body 3 vibrates, thereby generating a traveling wave in the elastic body 1, and the rotor 7 pressed against the elastic body 1 receives the traveling wave to rotate. It has become. The diameter of the piezoelectric body 3 is
The diameter of the rotor 7 and the elastic body 1 corresponds to that of the piezoelectric body 3 and is 45 mm.
フィードバック用電極は、圧電体３の一つの分極（高
周波電圧の1/2波長の長さ）の1/2巾と同じ巾で、圧電体
３の２区分間に設けた巾の広い方の間隔の中央に配置さ
れ、発生電圧を取出せるようになっている。The feedback electrode has the same width as the half width of one polarization of the piezoelectric body 3 (length of half wavelength of high-frequency voltage), and the wider space provided between the two sections of the piezoelectric body 3. It is placed in the center of the so that the generated voltage can be taken out.
「発明が解決しようとする課題」 しかしながら、従来の超音波モータの入力制御装置
は、消費電力のわりに、駆動効率が良くならないという
問題点があった。[Problems to be Solved by the Invention] However, the conventional input control device for the ultrasonic motor has a problem that the driving efficiency is not improved in spite of the power consumption.
また、圧電体の振動効率を良くするため、２組の圧電
体部分を1/4波長ずらし、1/2波長のピッチで＋極と−極
とに交互に分極させて配置しているので、3/4波長が余
る。この余った3/4波長がフィードバック電極以外に有
効に使用されていないという問題点があった。Further, in order to improve the vibration efficiency of the piezoelectric body, the two piezoelectric body portions are shifted by 1/4 wavelength, and are arranged by being alternately polarized into a + pole and a − pole at a pitch of 1/2 wavelength. 3/4 wavelength is left over. There is a problem that these remaining 3/4 wavelengths are not effectively used for anything other than the feedback electrode.
そこで本発明は、超音波モータの固定子に取付ける圧
電体の分極パターンを改良することにより、超音波モー
タの駆動効率を良くすることを目的とする。Therefore, an object of the present invention is to improve the driving efficiency of the ultrasonic motor by improving the polarization pattern of the piezoelectric body attached to the stator of the ultrasonic motor.
「課題を解決するための手段」 本発明は、外周が円形の弾性体の表面に環状の圧電体
を取付け、その圧電体を２つに区分して、この両区分を
それぞれ＋極と−極とに交互に分極し、この両区分にそ
れぞれに90゜位相の異なる高周波電圧を印加電極を介し
て上記圧電体に印加することにより、弾性体に進行波を
生じさせ、その進行波により弾性体に圧接したロータを
回転し、高周波電圧の1/4波長としたフィードバック用
電極を２つに区分した圧電体の境に設けて、このフィー
ドバック電極に生じた電圧の大きさに応じて入力制御回
路により高周波電圧を制御するようにした超音波モータ
の入力制御装置において、圧電体の両区分における分極
の巾は１つを3/8波長にし、残りを1/2波長の長さに形成
した。"Means for Solving the Problem" According to the present invention, an annular piezoelectric body is attached to the surface of an elastic body having a circular outer periphery, the piezoelectric body is divided into two, and both of these divisions are + and -poles. And are alternately polarized, and high-frequency voltages with 90 ° different phases are applied to the piezoelectric body through the application electrodes to the two sections, and a traveling wave is generated in the elastic body. Rotate the rotor that is pressed into contact with the rotor, and provide the feedback electrode with 1/4 wavelength of the high frequency voltage at the boundary of the piezoelectric body divided into two, and the input control circuit according to the magnitude of the voltage generated at this feedback electrode. In the input control device of the ultrasonic motor in which the high frequency voltage is controlled by, the polarization width in both sections of the piezoelectric body is set to 3/8 wavelength and the rest is formed to 1/2 wavelength.
「作用」 本発明は、圧電体の両区分における分極の巾の１つを
3/8波長にし、残りを1/2波長の長さに形成し、高周波電
圧の1/4波長としたフィードバック用電極を２つに区分
した圧電体の境に設けたことによって、超音波モータの
駆動効率を向上できた。これは、圧電体の広い範囲に高
周波電圧が印加されて、圧電体の非駆動部分が少ないか
らである。"Operation" The present invention provides one of the polarization widths in both sections of the piezoelectric body.
The ultrasonic motor is formed by setting the 3/8 wavelength and the remainder to the half wavelength length, and providing the feedback electrode for the 1/4 wavelength of the high frequency voltage at the boundary of the divided piezoelectric body. The driving efficiency of was improved. This is because the high frequency voltage is applied to a wide range of the piezoelectric body and the non-driving portion of the piezoelectric body is small.
「実施例」 次に、第１図により本発明の実施例を説明する。[Example] Next, an example of the present invention will be described with reference to FIG.
この実施例は、圧電体３が２つに区分されるととも
に、それに対応した印加電極４が設けられ、両区分の対
応する端部間の一方にフィードバック電極８が配置さ
れ、他方の端部間に、その両側の電極を導通させないた
めの微小間隔が配置される。圧電体３の２つの区分は、
それぞれ５つに分極され、それらは、全体で＋極と−極
が交互に配置される。また圧電体の分極のうち、フィー
ドバック用電極８側から４つ目までの圧電体の各分極
は、圧電体の中心に対応する角が例えば36゜となる巾
（高周波電圧の1/2波長の長さ）にされ、５つ目の分極3
a,3aは印加する高周波電圧の3/8波長の巾にした。この
ように５つ目の分極の巾を小さくしたのは、圧電体の駆
動面積を有効に利用するためである。In this embodiment, the piezoelectric body 3 is divided into two, the corresponding application electrode 4 is provided, the feedback electrode 8 is arranged at one of the corresponding ends of both sections, and the feedback electrode 8 is arranged between the other ends. In this case, a minute gap is arranged so that the electrodes on both sides thereof are not electrically connected. The two sections of the piezoelectric body 3 are
Each of them is polarized into five, and they have a total of alternating positive and negative poles. Further, among the polarizations of the piezoelectric body, each polarization of the piezoelectric bodies up to the fourth from the feedback electrode 8 side has a width at which the angle corresponding to the center of the piezoelectric body is, for example, 36 ° (a half wavelength of the high frequency voltage). Length) and the fifth polarization 3
The widths of a and 3a are 3/8 wavelength of the applied high frequency voltage. The reason why the width of the fifth polarization is reduced in this way is to effectively use the driving area of the piezoelectric body.
なお、フィードバック用電極８の巾は、高周波電圧の
1/4波長に形成され、圧電体３の直径は30mmに形成され
るとともに、弾性体１とロータ７との直径も圧電体３に
対応されるが、その他の構成は図２および図３と同一で
ある。Note that the width of the feedback electrode 8 is
The piezoelectric body 3 is formed to have a quarter wavelength, the diameter of the piezoelectric body 3 is set to 30 mm, and the diameters of the elastic body 1 and the rotor 7 correspond to the piezoelectric body 3, but other configurations are as shown in FIG. 2 and FIG. It is the same.
上記実施例では、圧電体の各分極の巾およびフィード
バック電極８の巾を高周波電圧の波長に対する所定の比
で示したが、それら大きさに近似する範囲であれば同様
の作用効果を有するものである。In the above embodiment, the width of each polarization of the piezoelectric body and the width of the feedback electrode 8 are shown as a predetermined ratio with respect to the wavelength of the high frequency voltage. is there.
「発明の効果」 本発明の超音波モータの入力制御装置は、圧電体の広
い範囲を有効に駆動させることができるので、超音波モ
ータの駆動効率がよい。[Advantages of the Invention] The input control device for an ultrasonic motor according to the present invention can effectively drive a wide range of the piezoelectric body, so that the driving efficiency of the ultrasonic motor is good.
第１図は本発明の超音波モータの入力制御装置の圧電体
の分極パターンを示す平面図、第２図は従来の超音波モ
ータ部分の正面図、第３図は従来の超音波モータの入力
制御装置の系統図である。 3a;5つ目の分極部分FIG. 1 is a plan view showing a polarization pattern of a piezoelectric body of an ultrasonic motor input control device of the present invention, FIG. 2 is a front view of a conventional ultrasonic motor portion, and FIG. 3 is an input of a conventional ultrasonic motor. It is a systematic diagram of a control apparatus. 3a; 5th polarization part
Claims (1)
を取付け、その圧電体を２つに区分して、この両区分を
それぞれ＋極と−極とに交互に分極し、この両区分にそ
れぞれに90゜位相の異なる高周波電圧を印加電極を介し
て上記圧電体に印加することにより、弾性体に進行波を
生じさせ、その進行波により弾性体に圧接したロータを
回転し、高周波電圧の1/4波長としたフィードバック用
電極を２つに区分した圧電体の境に設けて、このフィー
ドバック電極に生じた電圧の大きさに応じて入力制御回
路により高周波電圧を制御するようにした超音波モータ
の入力制御装置において、圧電体の両区分における分極
の巾は１つを3/8波長にし、残りを1/2波長の長さに形成
したことを特徴とする超音波モータの入力制御装置。1. An annular piezoelectric body is attached to the surface of an elastic body having a circular outer periphery, the piezoelectric body is divided into two, and these two sections are alternately polarized into a positive pole and a negative pole. By applying high-frequency voltage with 90 ° phase difference to each of the two sections to the piezoelectric body through the application electrode, a traveling wave is generated in the elastic body, and the traveling wave rotates the rotor pressed against the elastic body. A feedback electrode with 1/4 wavelength of the high frequency voltage is provided at the boundary of the piezoelectric body divided into two, and the high frequency voltage is controlled by the input control circuit according to the magnitude of the voltage generated at this feedback electrode. In the ultrasonic motor input control device described above, one of the widths of polarization in both sections of the piezoelectric body is set to 3/8 wavelength, and the other is formed to 1/2 wavelength length. Input control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63062775A JP2694142B2 (en) | 1988-03-16 | 1988-03-16 | Ultrasonic motor input control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63062775A JP2694142B2 (en) | 1988-03-16 | 1988-03-16 | Ultrasonic motor input control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01238471A JPH01238471A (en) | 1989-09-22 |
| JP2694142B2 true JP2694142B2 (en) | 1997-12-24 |
Family
ID=13210085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63062775A Expired - Fee Related JP2694142B2 (en) | 1988-03-16 | 1988-03-16 | Ultrasonic motor input control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2694142B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010004212A1 (en) | 2009-01-08 | 2010-09-16 | Hoya Corporation | ultrasonic motor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247221A (en) * | 1988-10-21 | 1993-09-21 | Canon Kabushiki Kaisha | Vibration wave driven actuator |
| JP3161028B2 (en) * | 1992-05-27 | 2001-04-25 | 松下電器産業株式会社 | Ultrasonic motor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6074983A (en) * | 1983-09-30 | 1985-04-27 | Hitachi Maxell Ltd | Traveling wave generating element using ring-shaped composite resonator |
| JPS61221584A (en) * | 1985-03-26 | 1986-10-01 | Canon Inc | Drive circuit of vibration wave motor |
| JPH0681523B2 (en) * | 1985-03-29 | 1994-10-12 | キヤノン株式会社 | Vibration wave motor |
-
1988
- 1988-03-16 JP JP63062775A patent/JP2694142B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010004212A1 (en) | 2009-01-08 | 2010-09-16 | Hoya Corporation | ultrasonic motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01238471A (en) | 1989-09-22 |
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