Piezoelectric rotating electrical machine

Abstract

The utility model discloses a piezoelectric rotating motor, which comprises a piezoelectric driving mechanism and a rotor driven by the piezoelectric driving mechanism to rotate. The rotor sleeves the positioning table of the base and can rotate around the positioning table; the rotor is provided with an elastic clamping part used for clamping the push rod of the piezoelectric driving mechanism, so that when the push rod stretches out and draws back, the elastic clamping part can slide on the push rod. The utility model has the advantages of simple and compact structure and small occupied space, and can further realize miniaturization on the premise of ensuring basic functions.

Description

Technical Field

[0001] The utility model relates to a rotating motor driven by piezoelectricity. Background Art

[0002] The most common power output devices are electromagnetically driven motors. Compared with motors, piezoelectric motors have the advantages of being immune to electromagnetic interference, high output efficiency, simple structure, low power consumption, and high displacement resolution. Under the same output effect conditions, they can have a smaller volume, higher control accuracy, and less energy consumption, thus making them more widely used.

[0003] The applicant's prior application CN117318528A discloses a piezoelectric driven rotary motor, comprising a piezoelectric body, a friction head coaxially arranged therewith fixed at the front end of the piezoelectric body; a turntable, the piezoelectric body and the friction head are located on the central axis of the turntable, so that when the piezoelectric body is excited, the friction head acts on the circumference of the turntable to drive the turntable to rotate; a base is also included, the turntable and the piezoelectric body are both mounted on the base; a plurality of elastic support bodies are symmetrically arranged on both sides of the piezoelectric body on the base, and the force application direction of the elastic support bodies is on the same plane as the movement direction of the piezoelectric body when it is excited.

[0004] In the above scheme, after the piezoelectric body is excited, it performs elliptical motion in the plane where it is located, so that the friction head is used to rub the turntable to drive the turntable to rotate. In order to prevent the piezoelectric body from moving, it is necessary to set elastic support bodies on both sides of the piezoelectric body to prevent the piezoelectric body from moving. Although the installation of elastic support bodies can improve the overall performance, it is not conducive to miniaturization. For some use environments that do not require high rotation stroke, the above scheme will have the defect of being large in overall volume and not compact enough. Utility Model Content

[0005] In view of this, the utility model provides a piezoelectric rotary motor with small volume and simple and compact structure.

[0006] In order to solve the above technical problems, the technical solution of the utility model is to adopt a piezoelectric rotating motor, including a piezoelectric driving mechanism and a rotor driven to rotate by the piezoelectric driving mechanism; the rotor is mounted on a positioning platform of the base and can rotate around the positioning platform; an elastic clamping component for clamping the push rod of the piezoelectric driving mechanism is provided on the rotor, so that when the push rod is extended or retracted, the elastic clamping component can slide on the push rod.

[0007] As an improvement, the rotor comprises an annular rotor body, and the elastic clamping component is connected to the edge of the rotor body; the elastic clamping component is formed by bending a metal spring.

[0008] As a further improvement, the elastic clamping component includes two or more clamping pieces arranged in the up-down direction.

[0009] As another further improvement, the spring sheet is connected to the edge of the rotor body and extends radially outward to form an extension arm, and the front end of the extension arm is bent axially downward by 90° and then bent radially inward by 90° to form a clip I; the front end of the clip I is bent axially downward by 90°, radially outward by 90°, axially upward by 90°, and radially inward by 90° in sequence to form a clip II.

[0010] As an improvement, the width of the clip is greater than the width of the spring.

[0011] As an improvement, the positioning platform is provided with a positioning column; and further comprises a cover for axially limiting the rotor; the cover is provided with a positioning hole, and the positioning column passes through the positioning hole.

[0012] As an improvement, a positioning groove having the same shape as the positioning platform is formed on the sealing cover.

[0013] As an improvement, an annular glue dispensing groove is provided on the positioning platform at the positioning column, and the cover is fixed to the positioning platform by glue dispensing at the glue dispensing groove.

[0014] As an improvement, the piezoelectric drive mechanism includes a piezoelectric body, and the push rod is arranged at one end of the piezoelectric body.

[0015] As an improvement, a counterweight is provided on the end of the piezoelectric body opposite to the push rod.

[0016] The utility model is beneficial in that:

[0017] In the piezoelectric rotary motor with the above structure, when a driving signal is input, the piezoelectric body will be deformed due to the inverse piezoelectric effect, driving the push rod to extend or shorten along the axial direction. Since the rotor is clamped on the push rod by the elastic clamping part, when the speed of the push rod extending is fast enough, the two will produce relative displacement, and the push rod will produce friction force on the elastic clamping part. Under the action of the friction force, the elastic clamping part drives the rotor to move, realizing the function of rotor actuation. The utility model has a simple and compact structure, occupies a small space, and can further achieve miniaturization while ensuring basic functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded view of the utility model.

[0019] Figure 2 This is a schematic diagram of the rotor structure.

[0020] Figure 3 Schematic diagram of the structure of the piezoelectric drive mechanism.

[0021] Figure 4 A schematic diagram of the structure of the base.

[0022] Figure 5 A schematic diagram of the cover structure.

[0023] Figure 6 Schematic diagram of the rotor rotation.

[0024] Markings in the figure:

[0025] 1-cover; 2-rotor; 3-piezoelectric drive mechanism; 4-base;

[0026] 11-positioning hole, 12-positioning groove;

[0027] 21- rotor body; 22- clip I; 23- clip II;

[0028] 31- push rod; 32- piezoelectric body; 33- counterweight; 34- PI N foot;

[0029] 41-bearing structure; 42-glue dispensing slot I; 43-glue dispensing slot II; 44-positioning column; 45-glue dispensing slot III; 46-PI N slot; 47-positioning table. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0031] like Figure 1 As shown, the utility model is a piezoelectric rotary motor, comprising a piezoelectric drive mechanism 3 and a rotor 2 driven to rotate by the piezoelectric drive mechanism 3; the rotor 2 is sleeved on a positioning platform 47 of a base 4 and can rotate around the positioning platform 47; an elastic clamping component for clamping a push rod 31 of the piezoelectric drive mechanism 3 is provided on the rotor 2, so that when the push rod 31 is extended or retracted, the elastic clamping component can slide on the push rod 31.

[0032] The principle of the utility model is that when the driving signal is input, the piezoelectric body 32 will be deformed due to the inverse piezoelectric effect and drive the push rod 31 fixed thereto to extend or shorten along the axial direction. Since the rotor is clamped on the push rod 31 by the elastic clamping part, when the speed of the push rod 31 extending is fast enough, the two will produce relative displacement, and the push rod 31 will generate friction force on the elastic clamping part 2. Under the action of the friction force, the elastic clamping part drives the rotor 2 to move, realizing the function of the rotor 2 actuating. Of course, due to the limitations of the push rod 31 and the elastic clamping part, the rotor 2 can only rotate a certain angle and cannot rotate a full circle, which can be used to drive some devices that need to swing back and forth. Figure 6 The movement of the rotor 2 in the present invention is shown, including three states where the rotor is on the left, in the middle, and on the right.

[0033] like Figure 2As shown, the rotor 2 in the present invention comprises an annular rotor body 21, and an elastic clamping component is connected to the edge of the rotor body 21; the elastic clamping component is formed by bending a metal spring sheet.

[0034] More specifically, the elastic clamping component includes two clips (of course, there can be more) arranged in the upper and lower directions, namely, clip I22 and clip I23, which clamp the push rod 31 from the upper and lower directions. Specifically, the spring is connected to the edge of the rotor body 1 and extends radially outward to form an extension arm, and the front end of the extension arm is axially bent 90° downward and then radially bent inward to form the clip I22; the front end of the clip I22 is axially bent 90° downward, radially bent 90° outward, axially bent 90° upward, and radially bent 90° inward in sequence to form the clip I23. The rotor body 21 and the elastic clamping part are integrally formed, which simplifies the process and reduces the manufacturing cost. The width of the clip I22 and the clip I23I is greater than the width of the spring, which increases the contact area with the push rod 31 to avoid slipping.

[0035] like Figure 4 , Figure 5 As shown, in addition, a positioning column 44 is provided on the positioning platform 47; a cover 1 for axially limiting the rotor 2 is also included; a positioning hole 11 is provided on the cover 1, and the positioning column 44 is inserted into the positioning hole 11. The cover 1 is pressed on the rotor 2 (without pressing it tightly), which can effectively prevent the rotor 2 from axial movement. More specifically, a positioning groove 12 with the same shape as the positioning platform 47 is provided on the cover 1, so that the cover 1 can be buckled on the positioning platform 47. An annular glue dispensing groove II I45 is provided on the positioning platform 47 at the location of the positioning column 44, and the cover 1 is fixed to the positioning platform 47 by dispensing glue at the glue dispensing groove II I45.

[0036] like Figure 3 As shown, the piezoelectric drive mechanism 3 in the present invention comprises a piezoelectric body 32, and the push rod 31 is arranged at one end of the piezoelectric body 32. A counterweight block 33 is arranged on the end of the piezoelectric body 32 opposite to the push rod 31.

[0037] The assembly process of the utility model is as follows: first, the push rod 31 of the piezoelectric drive mechanism 3 is clamped by the elastic clamping part on the rotor 2. Then, after applying glue in the glue dispensing groove I41 and the glue dispensing groove II42 of the base 4, the piezoelectric drive mechanism 3 and the rotor 2 are placed in the base 4, so that the rotor sleeve and the positioning platform 47 and the piezoelectric drive mechanism are placed on the bearing structure 41 of the base 4, and the PIN foot 34 on the piezoelectric body is placed in the PIN groove 46 of the base. The positioning hole 11 on the cover 1 matches the positioning column 44 on the base 4, and is fixed by applying glue in the glue dispensing groove II45 on the base 4.

[0038] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A piezoelectric rotating motor, characterized in that: It includes a piezoelectric drive mechanism and a rotor driven to rotate by the piezoelectric drive mechanism; the rotor is sleeved on a positioning platform of a base and can rotate around the positioning platform; an elastic clamping component for clamping a push rod of the piezoelectric drive mechanism is provided on the rotor, so that when the push rod is extended or retracted, the elastic clamping component can slide on the push rod.

2. A piezoelectric rotating motor according to claim 1, characterized in that: The rotor comprises an annular rotor body, and the elastic clamping component is connected to the edge of the rotor body; the elastic clamping component is made of bent metal spring sheets.

3. A piezoelectric rotating motor according to claim 2, characterized in that: The elastic clamping component includes two or more clamping pieces arranged in the up-down direction.

4. A piezoelectric rotating motor according to claim 3, characterized in that: The spring sheet is connected to the edge of the rotor body and radially extends outward to form an extension arm, and the front end of the extension arm is axially bent downward by 90° and then radially bent inward to form a clip I; The front end of the clip I is successively bent 90° axially downward, 90° radially outward, 90° axially upward, and 90° radially inward to form a clip II.

5. A piezoelectric rotating motor according to claim 3, characterized in that: The width of the clip is greater than the width of the spring.

6. The piezoelectric rotating motor according to claim 1, characterized in that: The positioning platform is provided with a positioning column; it also includes a cover for axially limiting the rotor; the cover is provided with a positioning hole, and the positioning column passes through the positioning hole.

7. A piezoelectric rotating motor according to claim 6, characterized in that: The sealing cover is provided with a positioning groove which is in the same shape as the positioning platform.

8. The piezoelectric rotating motor according to claim 6, characterized in that: The positioning platform is provided with an annular glue dispensing groove at the positioning column, and the sealing cover is fixed to the positioning platform by glue dispensing at the glue dispensing groove.

9. The piezoelectric rotating motor according to claim 1, characterized in that: The piezoelectric driving mechanism comprises a piezoelectric body, and the push rod is arranged at one end of the piezoelectric body.

10. A piezoelectric rotating motor according to claim 9, characterized in that: A counterweight block is arranged on one end of the piezoelectric body opposite to the push rod.

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