CN211266794U

CN211266794U - Bending vibration type inertia ultrasonic motor

Info

Publication number: CN211266794U
Application number: CN201921604725.6U
Authority: CN
Inventors: 杨颖�; 许睿; 皮奥特尔·瓦西尔耶夫; 邱建敏
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-08-14
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses a bending vibration type inertia ultrasonic motor relates to ultrasonic motor technical field. A bending mode inertial ultrasonic motor comprising: stator, piezoceramics, carbon fiber tube, member, slider and shell. The stator is a circular ring metal sheet, and the outer edge of the circular ring is provided with uniformly distributed fixing structures which are connected with the shell; the piezoelectric ceramics are flat annular sheets, and the upper and lower sheets are respectively attached to the upper and lower surfaces of the stator; the carbon fiber tube and the rod piece form a group of friction pairs, and bending vibration of the stator is converted into up-and-down motion of the rod piece; the rod piece is fixedly connected with the sliding block and can drive the sliding block to move. The utility model discloses can provide sufficient rotational speed output and moment output when guaranteeing that the motor size is small, satisfy miniature zoom system structure requirement.

Description

Bending vibration type inertia ultrasonic motor

Technical Field

The utility model relates to an supersound motor technical field especially relates to a bending vibration type inertia supersound motor.

Background

The most typical application of ultrasonic motors in the civilian field is driving camera lenses. Compared with the traditional motor, the ultrasonic motor has unique advantages in the field of miniaturization. Therefore, in the field of miniature zoom systems, ultrasonic motors have a wide development space. A typical application of the miniature zoom system is a zoom lens of a mobile phone, the current mainstream mobile phones in the market realize the zoom function by combining digital zoom and a plurality of lenses, the digital zoom is established on the basis of sacrificing the picture quality, so that most mobile phone lenses are not fully represented during zooming, and the miniature ultrasonic motor can be used as a platform for carrying the lenses to realize optical zoom on the mobile phone lenses, so that the imaging capability of the mobile phone lenses is greatly improved.

SUMMERY OF THE UTILITY MODEL

To the above technical problem, the utility model aims at providing a bending vibration type inertia ultrasonic motor can satisfy miniature zoom system's requirement to have each item advantage of general ultrasonic motor concurrently, like the response is fast, the noise is low, no electromagnetic interference etc..

In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:

the embodiment of the utility model provides a bending vibration type ultrasonic motor, include: the stator comprises a stator 1, piezoelectric ceramics 2, a carbon fiber tube 3, a rod piece 4, a sliding block 5 and a shell 6, wherein the stator 1 is fixed on a boss on the inner side of the shell 6 through a fixing structure uniformly distributed at the edge of the stator; the piezoelectric ceramics 2 are flat circular ring pieces, the upper piece and the lower piece are respectively stuck on the annular surface of the stator 1, and the polarization directions of the piezoelectric ceramics 2 are the same and are both upward or downward; the carbon fiber tubes 3 are fixed on the upper surface of the upper piezoelectric ceramic 2, the fixed positions are on a pitch circle of a bending vibration mode excited by the stator, and the two carbon fiber tubes 2 are symmetrically distributed on one diameter of a circular ring of the piezoelectric ceramic 2; the friction pair 7 has proper pre-pressure, and can be realized by matching the carbon fiber pipes 3 and the rod pieces 4 with different sizes, or by other methods; the two ends of the sliding block 5 are provided with fixing structures with holes and are connected with one section of the rod piece 4, and the bending vibration of the stator 1 can be converted into the unidirectional movement of the sliding block 5 by the friction pair 7 by utilizing the inertia principle and the slow-forward and fast-return principle.

As an embodiment, the outer ring of the stator 1 has a plurality of fixing structures 8 uniformly distributed on the outer ring of the stator 1.

In one embodiment, the stator 1 is made of a material with low density and high strength, such as aluminum alloy.

In one embodiment, the inner diameter of the piezoelectric ceramic 2 is the same as the inner diameter of the stator 1, and the outer diameter of the stator is required to be equal to or larger than the outer diameter of the piezoelectric ceramic.

As an embodiment, the friction pair 7 needs to have a proper pre-pressure, which can be realized by matching carbon fiber tubes 3 and rod members 4 with different sizes, or by other methods.

In one embodiment, the slider 5 is made of a lightweight material.

As an implementation mode, when the ultrasonic motor is in a working state, the polarization directions of the upper and lower piezoelectric ceramics are the same, and the same square wave or sawtooth wave signal is applied to the upper and lower surfaces of the upper and lower piezoelectric ceramics 2 through the electrodes to excite the stator 1 to generate out-of-plane bending vibration.

The embodiment of the utility model provides a pair of bending vibration type inertia ultrasonic motor when guaranteeing that the structure is small, can provide sufficient output torque and output speed, kept the advantage that ultrasonic motor is consistent moreover, like compact structure, response fast, low noise, do not receive electromagnetic interference etc.. The method can be applied to a micro zoom system, an optical zoom lens of a mobile phone and the like. The embodiment of the utility model discloses a there is wide application prospect in fields such as optical instrument, micromachine, aerospace.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a bending vibration type inertial ultrasonic motor according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a stator of a bending vibration type inertial ultrasonic motor according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a friction pair of a bending vibration type inertia ultrasonic motor according to an embodiment of the present invention;

fig. 4 is a schematic working diagram of a bending vibration type inertial ultrasonic motor according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an excitation signal of a bending vibration type inertial ultrasonic motor according to an embodiment of the present invention;

in the figure, 1-stator, 2-piezoelectric ceramic, 3-carbon fiber tube, 4-rod, 5-slide block, 6-shell, 7-friction pair, 8-fixed structure and 9-upper and lower surfaces of stator.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

It will be understood by those within the art that, unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

An embodiment of the utility model provides a bending vibration type inertia supersound motor can promote the motor performance when the assurance structure is little, and has the commonality advantage of supersound motor concurrently, if compact structure, response are fast, the low noise, do not receive electromagnetic interference etc..

the utility model discloses an implementation case provides a bending vibration type inertia supersound motor, as shown in fig. 1, include: stator 1, piezoceramics 2, carbon fiber tube 3, member 4, slider 5, shell 6, its characterized in that: the stator 1 is uniformly distributed on a boss at the inner side of the shell 6 through a fixing structure uniformly distributed at the edge of the stator; the piezoelectric ceramics 2 are flat circular ring pieces, the upper piece and the lower piece are respectively stuck on the annular surface of the stator 1, and the polarization directions of the piezoelectric ceramics 2 are the same and are both upward or downward; the carbon fiber tubes 3 are fixed on the upper surface of the upper piezoelectric ceramic 2, the fixed positions are on a pitch circle of a bending vibration mode excited by the stator, and the two carbon fiber tubes 2 are symmetrically distributed on one diameter of a circular ring of the piezoelectric ceramic 2; the friction pair 7 has proper pre-pressure, and can be realized by matching the carbon fiber pipes 3 and the rod pieces 4 with different sizes, or by other methods; the two ends of the sliding block 5 are provided with fixing structures with holes and are connected with one end of the rod piece 4, the rod piece 4 is enabled to move in one direction along with the accumulation of vibration times by the aid of the friction pair 7 and the inertia principle, so that the bending vibration of the stator 1 can be converted into the one-way movement of the sliding block 5, and the bending vibration of the stator 1 can be converted into the one-way movement of the sliding block 5 by the aid of the inertia principle and the slow-forward and fast-return principle.

As an embodiment, the position where the carbon fiber tube 3 is fixed on the side of the piezoelectric ceramic 2 needs to be determined by referring to the pitch circle of the working mode of the stator 1. For example, the working mode is out-of-plane second-order bending vibration, so that the carbon fiber tube 3 is fixed on a symmetrical line of the annular edge fixing structure of the stator 1.

In one embodiment, the friction pair 7 is formed by matching the carbon fiber tube 3 and the rod 4, and a proper pre-pressure should be applied between the carbon fiber tube 3 and the rod 4. For example, carbon fiber tubes 3 with different specifications are selected to be matched with the rod piece 4, so that the aim of adjusting the pre-pressure is fulfilled. Finally, the rod 4 with the outer diameter of 0.3mm and the carbon fiber tube 3 with the inner diameter of 0.3mm are selected, so that a relatively ideal working state can be obtained.

In one embodiment, the pre-pressure of the friction pair 7 may be applied in another manner, such as cutting the side surface of the carbon fiber tube 3, binding the elastic constraint on the outer side of the carbon fiber tube 3, and adjusting the stiffness of the elastic constraint to adjust the pre-pressure of the friction pair 7

In one embodiment, the inner diameter of the piezoelectric ceramic 2 is the same as the inner diameter of the stator 1, while the outer diameter of the stator 1 is equal to or greater than the outer diameter of the piezoelectric ceramic 2, and both the upper and lower sheets of piezoelectric ceramic are polarized in the thickness direction and the polarization directions are the same.

The embodiment of the utility model provides an in, two upper and lower piezoceramics polarization directions are the same, and same square wave signal or sawtooth wave signal are applyed respectively for upper and lower piezoceramics 2 through the electrode, and excitation stator 1 produces the outer bending vibration of face, is the outer second order bending vibration of off-plate in this example, and the transmission of bending vibration is slider 5's removal through friction pair 7 again.

In the embodiment of the present invention, when the motor is in operation, the working process is as shown in fig. 4. The working principle is as follows: under the action of the excitation voltage shown in fig. 5, when the stator 1 is excited out of the surface to perform second-order bending vibration, the carbon fiber tube 3 at the pitch circle position is driven to vibrate up and down, so that the sliding block 5 is driven to move up and down. When the excitation voltage is changed slowly from a to b, the rod 4 is moved up smoothly together with the carbon fiber tube 3 by the static friction force; when the excitation voltage suddenly and rapidly drops from b to c, the carbon fiber tube 3 rapidly moves downward, and the lever 4 moves upward by one step because the inertial force of the lever overcomes the sliding friction force without following the downward movement of the carbon fiber tube 3. When the excitation voltage is changed to d from slow, the rod piece 4 moves upwards along with the carbon fiber tube 3; when the voltage drops suddenly from d to e, the carbon fiber tube 3 moves down rapidly, and the rod member 4 does not move down together with the carbon fiber tube 3 due to the action of the inertia force of the rod member 4, so that the rod member 4 moves up by one step. And repeating the steps, and accumulating step by step, so that the rod piece 4 continuously moves upwards along the carbon fiber tube 3 in a stepping manner, and the sliding block 5 is driven to move in the same direction. Similarly, when the opposite-phase excitation signal is applied, the rod member 4 can realize continuous movement downward along the carbon fiber tube 3.

In the embodiment of the utility model provides an in, slider 5 is cavity ring structure, 6 bottoms of shell also have circular hole, and light can conveniently pass through the motor. The structure of the sliding block 5 can also be changed according to the actual requirement.

In the embodiment of the present invention, the stator 1 outer ring has 4 fixing structures 8, which are evenly distributed on the stator 1 outer ring, as shown in fig. 2.

The embodiment of the utility model provides an in, stator 1 adopts aluminum alloy 6061 preparation, and upper and lower surface 9 is through grinding treatment, and stator 1's preparation material also can be changed into other matter light material certainly.

In the embodiment of the utility model provides an in, slider 5 adopts aluminum alloy 6061 preparation, also can adopt the preparation of other matter light material.

In order to increase the bending vibration amplitude of the stator 1 in the example of the present invention, the second-order bending vibration mode shown in fig. 5 is selected.

The embodiment of the utility model provides a pair of bending vibration type inertia supersound motor, satisfying the structure when small, all have better performance at output torque end and output speed end, have general supersound motor ground advantage moreover concurrently, if compact structure, response are fast, the low noise, do not receive electromagnetic interference etc.. The method can be applied to a micro zoom system, an optical zoom lens of a mobile phone and the like. The embodiment of the utility model discloses a there is wide application prospect in fields such as optical instrument, micromachine, aerospace.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A bending vibration type inertia ultrasonic motor is characterized in that: comprises a stator (1), piezoelectric ceramics (2), a carbon fiber tube (3), a rod piece (4), a sliding block (5) and a shell (6); wherein,

the stator (1) is a circular ring sheet and is fixed on a boss on the inner side of the shell (6), and annular piezoelectric ceramics (2) are fixed on two sides of the stator (1); on one side of the stator (1), the carbon fiber tube (3) is fixed on the piezoelectric ceramic (2); the rod piece (4) and the carbon fiber pipe (3) form a friction pair, displacement generated by bending vibration of the stator (1) is transmitted through the friction pair, so that the sliding block (5) is pushed to move, and the other end of the rod piece (4) is fixed on two sides of the sliding block (5).

2. The ultrasonic bending-vibration inertial motor according to claim 1, wherein: the stator (1) is of a circular ring sheet structure, and fixing structures which are uniformly distributed are arranged on the outer edge of the circumference of the stator.

3. The ultrasonic bending-vibration inertial motor according to claim 1, wherein: the piezoelectric ceramic (2) is provided with an annular structure matched with the stator, and the ultrasonic motor is provided with two piezoelectric ceramic (2) with the same specification, wherein the upper and lower sheets are fixed on the upper and lower surfaces of the stator respectively.

4. The ultrasonic bending-vibration inertial motor according to claim 1, wherein: one end of the carbon fiber tube (3) is fixed on one side surface of the piezoelectric ceramic (2), and the fixed position is determined by a pitch circle generated by the working mode of the selected piezoelectric ceramic.

5. The ultrasonic bending-vibration inertial motor according to claim 4, wherein: the carbon fiber tube (3) and the rod piece (4) form a group of friction pairs (7), and the friction pairs (7) convert bending vibration of the stator (1) into unidirectional motion of the sliding block (5) through inertia effect and slow-forward and fast-backward working principle.

6. The ultrasonic bending-vibration inertial motor according to claim 5, wherein: the carbon fiber tube (3) and the rod piece (4) in the friction pair (7) have pre-pressure, and the pre-pressure capable of driving the motor to operate is adjusted by matching the carbon fiber tubes (3) with different inner diameters and the rod pieces (4) with different outer diameters.