Piezoelectric driving structure and rotating electric machine

Through the combination of the annular piezoelectric vibrator and the pre-pressing spring, the problems of high cost and long-term manufacturing in the prior art are solved, and the low-cost mass production of piezoelectric driving structures and rotary motors are realized.

CN223261460UActive Publication Date: 2025-08-22LIAONING ZHONGGUANG ELECTRIC TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202422329307.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-24
Publication Date
2025-08-22
Estimated Expiration
2034-09-24

AI Technical Summary

Technical Problem

In the existing piezoelectric drive structure, the structure with the lower part as the base and the upper part as the teeth can only be machined and manufactured, resulting in high costs and long production time, which is not conducive to the mass production of consumer electronic products.

Method used

A circular piezoelectric vibrator is designed to cooperate with a pre-pressing spring, and the elastic body extends from the friction head along one side. The pre-pressing spring is driven to rotate by friction, driving the rotating motor rotor to rotate, and a low-cost processing technology is adopted.

Benefits of technology

It reduces manufacturing time and cost, which is conducive to the mass production of piezoelectric drive structures and rotary motors.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223261460U_ABST
    Figure CN223261460U_ABST
Patent Text Reader

Abstract

The utility model provides a piezoelectric driving structure and a rotating motor, and relates to the technical field of optical element driving. The piezoelectric driving structure comprises a piezoelectric vibrator and a pre-pressing spring, and the pre-pressing spring is connected with the piezoelectric vibrator in an abutting mode. The piezoelectric vibrator comprises a piezoelectric element and an elastic body, the piezoelectric element is fixedly connected with the elastic body, a plurality of friction heads distributed at equal intervals extend out of one side face of the elastic body, and the friction heads make contact with the pre-pressing spring; wherein the piezoelectric vibrator is of an annular structure. According to the technical scheme, the technical problems that in the prior art, an elastomer in a piezoelectric driving structure is of a structure with the lower portion being a base body and the upper portion being teeth, only can be manufactured in a machining mode, cost is high, manufacturing time is long, and production and cost control of large-scale consumer electronic products are not facilitated can be solved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The present application relates to the field of optical element driving technology, and in particular to a piezoelectric driving structure and a rotating motor. Background Art

[0002] With technological advancements, mobile phone optical lenses are increasingly using micro-structured rotary ultrasonic motors for applications such as VA, AF, and image stabilization. Piezoelectric drives are gaining widespread adoption due to their advantages, such as high thrust and lack of magnetic interference. Existing piezoelectric ultrasonic motors on the market typically employ a base structure with teeth at the top and an elastic body at the bottom. This structure can only be manufactured through machining, which is costly and time-consuming, making it unsuitable for high-volume production and cost control of consumer electronics. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a piezoelectric drive structure and a rotary motor to solve the problems in the prior art that the elastomer in the piezoelectric drive structure adopts a structure with a lower part as a base and an upper part as teeth, which can only be manufactured by machining, has high costs and a long production time, and is not conducive to the production and cost control of large-scale consumer electronic products.

[0004] To solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0005] In a first aspect, the present application provides a piezoelectric drive structure, comprising: a piezoelectric vibrator and a preload spring, the preload spring abutting against the piezoelectric vibrator; the piezoelectric vibrator comprising a piezoelectric element and an elastic body, the piezoelectric element being fixedly connected to the elastic body, the elastic body extending along a side surface thereof with a plurality of friction heads distributed at equal intervals, the plurality of friction heads being arranged in contact with the preload spring;

[0006] Wherein, the piezoelectric vibrator is in a circular ring structure.

[0007] In some modified embodiments of the first aspect of the present application, a plurality of openings are provided on the pre-compression spring.

[0008] In some modified embodiments of the first aspect of the present application, the piezoelectric element is provided as one piece and is bonded to the upper surface or the lower surface of the elastic body.

[0009] In some modified embodiments of the first aspect of the present application, the piezoelectric element is provided in two pieces, which are bonded to both sides of the elastic body.

[0010] In some modified embodiments of the first aspect of the present application, the piezoelectric element is arranged to have four polarization regions in a circularly symmetrical manner, namely, a first polarization region, a second polarization region, a third polarization region, and a fourth polarization region. A driving voltage with the same frequency and a phase difference of 90° is applied to the four polarization regions. The first polarization region of the piezoelectric element expands when energized, and the third polarization region of the piezoelectric element contracts when energized, so that the piezoelectric vibrator is excited to produce a first mode; the second polarization region of the piezoelectric element expands when energized, and the fourth polarization region of the piezoelectric element contracts when energized, so that the piezoelectric vibrator is excited to produce a second mode; the first mode and the second mode are combined to produce a circular rotation, so that the friction head produces an elliptical motion.

[0011] The second aspect of the present application provides a rotating motor, including the piezoelectric drive structure, base, guide member, mover and upper cover as described above, the piezoelectric drive structure is embedded in the base, a guide member is provided between the piezoelectric drive structure and the base, the mover is fixedly connected to the piezoelectric drive structure, and the upper cover is buckled on the base and fixedly connected to the base.

[0012] In some modified implementations of the second aspect of the present application, the pre-stressed spring includes a pressure portion and a mounting portion, one side of the mounting portion is fixedly connected to the mover, and the other side of the mounting portion is provided with the guide member.

[0013] In some modified embodiments of the second aspect of the present application, a mounting hole is provided on one side of the mounting portion, and a mover fixing column is provided on the side of the mover close to the pre-compression spring, and the mover fixing column is passed through the mounting hole, so that the mover is fixedly connected to the pre-compression spring.

[0014] In some modified implementations of the second aspect of the present application, a circular hole is provided on the other side of the mounting portion, the guide member is provided in the circular hole, a slide rail is provided in the base, and the guide member slides in the slide rail.

[0015] In some modified embodiments of the second aspect of the present application, the elastic body extends several fixing parts along one side for fixedly connecting the piezoelectric device, a fixing groove is provided on the inner side of the base, and the fixing part is provided in the fixing groove, so that the piezoelectric drive structure is fixedly connected to the base.

[0016] Compared with the existing technology, the piezoelectric drive structure provided in this application is designed to cooperate with a circular piezoelectric vibrator and a pre-stressed spring, wherein the elastomer extends a friction head along one side to drive the contacting pre-stressed spring to rotate, thereby driving the rotor in the rotating motor to rotate. This elastomer can be realized using a low-cost processing technology, reducing manufacturing time and cost, and is conducive to mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 Schematically shows an exploded view of the piezoelectric drive structure in the second embodiment;

[0019] Figure 2 Schematically shows a structural diagram of the piezoelectric drive structure in the second embodiment from a first viewing angle;

[0020] Figure 3 Schematically shows a structural diagram of the piezoelectric drive structure in the second embodiment from a second viewing angle;

[0021] Figure 4 The schematic diagram of the structure of the pre-compression spring in the second embodiment is shown schematically;

[0022] Figure 5 The structure diagram of the piezoelectric vibrator in the second embodiment is schematically shown;

[0023] Figure 6 The schematic diagram of the structure of the polarization partition of the piezoelectric element in the second embodiment is shown schematically;

[0024] Figure 7 Schematically shows a schematic diagram of the first modal structure of the piezoelectric vibrator excited in the second embodiment;

[0025] Figure 8 The structure diagram of the second mode excited by the piezoelectric vibrator in the second embodiment is schematically shown;

[0026] Figure 9 Schematically shows an exploded view of the rotating electrical machine in the fourth embodiment;

[0027] Figure 10 The structure diagram of the rotating motor in the fourth embodiment is schematically shown without the upper cover;

[0028] Figure 11 The structure diagram of the guide member and the base in the fourth embodiment is schematically shown;

[0029] Figure 12 The exploded structure diagram of the connection between the mover and the piezoelectric drive structure in the fourth embodiment is schematically shown;

[0030] Figure 13The exploded structure diagram of the piezoelectric drive structure and the guide member in the fourth embodiment is schematically shown.

[0031] Description of Figure Numbers:

[0032] 1. Piezoelectric drive structure; 11. Piezoelectric vibrator; 111. Piezoelectric element; 1111. First polarization region; 1112. Second polarization region; 1113. Third polarization region; 1114. Fourth polarization region; 112. Elastomer; 1121. Friction head; 1122. Fixing portion; 12. Preload spring; 121. Pressure portion; 1211. Opening; 122. Mounting portion; 1221. Mounting hole; 1222. Circular hole; 2. Base; 21. Slide rail; 22. Fixing groove; 3. Guide member; 4. Mover; 41. Mover fixing column; 5. Upper cover. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this application belongs. Example 1

[0035] like Figures 1 to 5 As shown, the first embodiment provides a piezoelectric drive structure, wherein the piezoelectric drive structure 1 includes a piezoelectric vibrator 11 and a preload spring 12, wherein the preload spring 12 abuts against the piezoelectric vibrator 11; the piezoelectric vibrator 11 includes a piezoelectric element 111 and an elastic body 112, wherein the piezoelectric element 111 is fixedly connected to the elastic body 112, and the piezoelectric element 111 is provided as a single piece, wherein one side is in contact with the upper surface or the lower surface of the elastic body 112, and the elastic body 112 extends along one side thereof with a plurality of friction heads 1121 distributed at equal intervals, which may extend inwardly or outwardly, and are used to drive the preload spring 12 to rotate around the optical axis, thereby driving the entire structure to rotate around the optical axis, and the plurality of friction heads 1121 are in pressure contact with the preload spring 12, thereby providing preload for the friction heads 1121;

[0036] Among them, the piezoelectric vibrator 11 has a circular ring structure, the piezoelectric element 111 has a circular ring structure, and has a through hole in the center for light to pass through, that is, the piezoelectric element 111 is a ring-shaped piezoelectric ceramic piece, the elastomer 112 has a circular ring structure, the elastomer 112 is metal, and the size of the piezoelectric element 111 is adapted to the size of the elastomer 112.

[0037] like Figure 4 As shown, in a specific implementation, the pre-compression spring 12 is provided with a plurality of openings 1211 for easy assembly.

[0038] Example 2

[0039] like Figures 1 to 5 As shown, the second embodiment provides a piezoelectric driving structure. The difference between this embodiment and the first embodiment is that the piezoelectric element 111 is provided in two pieces, which are respectively attached to the two sides of the elastic body 112.

[0040] To sum up, the piezoelectric element 111 can be provided as one piece or two pieces, and can be adhered to one surface of the elastomer 112 alone, or to both surfaces of the elastomer 112 respectively, so that the structural design is more flexible. This can solve the problem in the prior art that the piezoelectric ceramic sheet used for excitation can only be adhered to the lower part of the elastomer, making the structural design compatible with the entire machine not flexible enough. Example 3

[0041] like Figures 1 to 13 As shown, the third embodiment provides a rotating motor, including the piezoelectric driving structure 1, base 2, guide member 3, mover 4 and upper cover 5 as in the first embodiment, the piezoelectric driving structure 1 is embedded in the base 2, a guide member 3 is provided between the piezoelectric driving structure 1 and the base 2, the mover 4 is fixedly connected to the piezoelectric driving structure 1, and the upper cover 5 is buckled on the base 2 and fixedly connected to the base 2.

[0042] The friction head 1121 of the elastic body 112 in the piezoelectric drive structure 1 is in pressure contact with the preload spring 12, and the preload spring 12 is driven to rotate around the optical axis by the guide member 3, thereby driving the mover 4 to rotate around the optical axis.

[0043] like Figure 4 、 Figure 9 As shown, in a specific implementation, the pre-stressed spring 12 includes a pressure portion 121 and a mounting portion 122, and an opening 1211 is provided between adjacent pressure portions 121 for easy installation; one side of the mounting portion 122 is fixedly connected to the mover 4, and the other side of the mounting portion 122 is provided with a guide member 3; wherein, the number of the mounting portions 122 is preferably three to make the structure more stable.

[0044] Specifically, a mounting hole 1221 is provided on one side of the mounting portion 122 , and a mover fixing column 41 is provided on the side of the mover 4 close to the preload spring 12 . The mover fixing column 41 is passed through the mounting hole 1221 , so that the mover 4 is fixedly connected to the preload spring 12 .

[0045] A circular hole 1222 is defined on the other side of the mounting portion 122 . The guide member 3 is disposed in the circular hole 1222 . A slide rail 21 is defined in the base 2 . The guide member 3 slides in the slide rail 21 .

[0046] like Figure 9As shown, in a specific implementation, the elastic body 112 extends a plurality of fixing portions 1122 along one side, and the number of the fixing portions 1122 is preferably four, which are used to fix the piezoelectric device. A fixing groove 22 is provided on the inner side of the base 2, and the fixing portion 1122 is provided in the fixing groove 22, so that the piezoelectric driving structure 1 is fixedly connected to the base 2. Example 4

[0047] like Figures 1 to 13 As shown, the fourth embodiment provides a rotating motor. The difference between the fourth embodiment and the third embodiment is that the piezoelectric element 111 is provided in two pieces, which are respectively attached to the two sides of the elastic body 112.

[0048] Working principle:

[0049] The piezoelectric element 111 is symmetrically arranged into four polarization regions, namely a first polarization region 1111, a second polarization region 1112, a third polarization region 1113 and a fourth polarization region 1114. Figure 6 As shown, driving voltages with the same frequency and phase differences of 90° are applied to the four polarization regions. The first polarization region 1111 of the piezoelectric element 111 expands when energized, and the third polarization region 1113 of the piezoelectric element 111 contracts when energized, so that the piezoelectric vibrator 11 is excited to produce the first mode, as shown in FIG. Figure 7 The second polarization region 1112 of the piezoelectric element 111 is energized to expand, and the fourth polarization region 1114 of the piezoelectric element 111 is energized to contract, so that the piezoelectric vibrator 11 is excited to produce a second mode, as shown in FIG. Figure 8 As shown, the first mode and the second mode are combined to produce circular rotation, causing the friction head to produce elliptical motion.

[0050] The elliptical motion trajectory generated by the piezoelectric vibrator 11 is closely fitted between the friction head 1121 of the piezoelectric vibrator 11 and the preload spring 12 , thereby driving the preload spring 12 to drive the mover 4 to rotate around the optical axis.

[0051] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A piezoelectric drive structure, characterized in that: include: a piezoelectric vibrator and a preload spring, wherein the preload spring abuts against the piezoelectric vibrator; The piezoelectric vibrator includes a piezoelectric element and an elastic body, wherein the piezoelectric element is fixedly connected to the elastic body, and a plurality of friction heads are extended from one side of the elastic body and are distributed at equal intervals, and the plurality of friction heads are arranged in contact with the preload spring; Wherein, the piezoelectric vibrator is in a circular ring structure.

2. The piezoelectric drive structure according to claim 1, wherein: The pre-compression spring is provided with a plurality of openings.

3. The piezoelectric drive structure according to claim 1, wherein: The piezoelectric element is provided as one piece and is attached to the upper surface or the lower surface of the elastic body.

4. The piezoelectric drive structure according to claim 1, wherein: The piezoelectric element is provided in two pieces, which are respectively attached to two sides of the elastic body.

5. The piezoelectric driving structure according to claim 1, wherein: The piezoelectric element is arranged to have four polarization regions in a circularly symmetrical manner, namely a first polarization region, a second polarization region, a third polarization region and a fourth polarization region. A driving voltage with the same frequency and a phase difference of 90° is applied to the four polarization regions. The first polarization region of the piezoelectric element expands when energized, and the third polarization region of the piezoelectric element contracts when energized, so that the piezoelectric vibrator is excited to produce a first mode; the second polarization region of the piezoelectric element expands when energized, and the fourth polarization region of the piezoelectric element contracts when energized, so that the piezoelectric vibrator is excited to produce a second mode; the first mode and the second mode are combined to produce a circular rotation, so that the friction head produces an elliptical motion.

6. A rotating electrical machine, characterized in that: It includes the piezoelectric drive structure, base, guide, mover and upper cover according to any one of claims 1 to 5, the piezoelectric drive structure is embedded in the base, a guide is provided between the piezoelectric drive structure and the base, the mover is fixedly connected to the piezoelectric drive structure, and the upper cover is buckled on the base and fixedly connected to the base.

7. The rotating electrical machine according to claim 6, wherein: The pre-compression spring includes a pressure portion and a mounting portion. One side of the mounting portion is fixedly connected to the mover, and the other side of the mounting portion is provided with the guide member.

8. The rotating electrical machine according to claim 7, wherein: A mounting hole is provided on one side of the mounting portion, and a mover fixing column is provided on a side of the mover close to the pre-compression spring. The mover fixing column is passed through the mounting hole, so that the mover is fixedly connected to the pre-compression spring.

9. The rotating electrical machine according to claim 7, wherein: A circular hole is provided on the other side of the mounting portion, the guide member is arranged in the circular hole, a slide rail is provided in the base, and the guide member slides in the slide rail.

10. The rotating electrical machine according to claim 6, wherein The elastic body extends from a side surface to form a plurality of fixing parts for fixing and connecting the piezoelectric device. A fixing groove is provided on the inner side of the base, and the fixing parts are arranged in the fixing groove, so that the piezoelectric driving structure is fixedly connected to the base.