Piezoelectric stack vibration reduction device and motor

Abstract

The present application discloses a piezoelectric stack vibration reduction device and a motor. The piezoelectric stack vibration reduction device includes an outer ring, an inner ring, a piezoelectric stack, an inner elastic support, and an outer elastic support. The inner ring is installed on the inner side of the outer ring and forms an annular space with the outer ring. The piezoelectric stack, inner elastic support, and outer elastic support are installed in the annular space. The outer side of the outer elastic support is connected to the outer ring, and the inner side of the inner elastic support is connected to the inner ring. The inner side of the outer elastic support and the outer side of the inner elastic support are radially offset. The piezoelectric stack is connected between the inner side of the outer elastic support and the outer side of the inner elastic support. The piezoelectric stack vibration reduction device has the advantages of good vibration and noise reduction effect, simple assembly, small overall size, light weight, high rigidity, and little change in the natural frequency of the motor structure after coupling with the motor.

Description

Technical Field

[0001] The present application relates to the field of vibration reduction technology, and in particular to a piezoelectric stack vibration reduction device, which can be applied to motors or other mechanisms requiring vibration reduction. Background Art

[0002] Electromagnetic noise is the primary source of motor vibration noise. Radial electromagnetic forces act radially on the stator core and radiate noise outward through the motor housing. When the electromagnetic force frequency approaches the motor's modal frequency, the motor resonates, causing severe vibration noise. Controlling and reducing motor vibration is of great practical significance.

[0003] Existing motor vibration reduction structures primarily employ rubber pads and other shock-absorbing materials placed under the motor base. However, rubber materials are significantly affected by temperature and are prone to aging. Their vibration reduction effect is limited, their functionality is limited, and they are ineffective in addressing motor noise. Furthermore, rubber materials have low stiffness, and coupling with the motor can alter the motor's natural frequency. Alternatively, the motor is placed within a vibration reduction device equipped with a spring. When the motor is impacted, the device reduces vibration by dissipating the energy of the spring during movement. However, the structural parameters of these vibration reduction devices are optimized for specific motor models and operating conditions. Once set, these parameters cannot be changed, resulting in a lack of adaptive vibration reduction capabilities and control flexibility.

[0004] Therefore, improving the motor vibration reduction structure is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the above technical problems, the present application provides a piezoelectric stack vibration reduction device, which includes an outer ring, an inner ring, a piezoelectric stack, an inner elastic support and an outer elastic support. The inner ring is installed on the inner side of the outer ring and forms an annular space with the outer ring. The piezoelectric stack, inner elastic support and outer elastic support are installed in the annular space. The outer side of the outer elastic support is connected to the outer ring, the inner side of the inner elastic support is connected to the inner ring, the inner side of the outer elastic support and the outer side of the inner elastic support are radially staggered, and the piezoelectric stack is connected between the inner side of the outer elastic support and the outer side of the inner elastic support.

[0006] In one embodiment of the piezoelectric stack vibration reduction device, there are multiple piezoelectric stacks, internal elastic supports and external elastic supports, and the piezoelectric stacks are evenly spaced along the entire circumference, and each piezoelectric stack is correspondingly arranged between an internal elastic support and an external elastic support.

[0007] In one embodiment of the piezoelectric stack vibration reduction device, a pressure plate is provided on the outer side of the inner elastic support and the inner side of the outer elastic support, the pressure plate being perpendicular to the radial direction, and the outer end surface and inner end surface of the piezoelectric stack are respectively in contact with the pressure plate of the inner elastic support and the pressure plate of the outer elastic support;

[0008] The inner elastic support and the outer elastic support are both provided with a support arm. The inner end of the support arm of the outer elastic support is connected to the pressure plate, and the outer end is connected to the outer ring. The outer end of the support arm of the inner elastic support is connected to the pressure plate, and the inner end is connected to the inner ring. Elastic deformation is achieved by changing the angle of the support arm relative to the pressure plate.

[0009] In one embodiment of the piezoelectric stack vibration reduction device, the inner elastic support and the outer elastic support are both provided with a plurality of support arms, the inner end of each support arm of the inner elastic support is inclined relative to the outer end in a direction away from the pressure plate, and the outer end of each support arm of the outer elastic support is inclined relative to the inner end in a direction away from the pressure plate.

[0010] An embodiment of a piezoelectric stack vibration reduction device, the piezoelectric stack vibration reduction device includes an inner base and an outer base, the outer side of the outer elastic support is connected to the outer base, the outer base is detachably mounted on the outer ring, the inner side of the inner elastic support is connected to the inner base, and the inner base is detachably mounted on the inner ring.

[0011] In one embodiment of the piezoelectric stack vibration reduction device, the outer elastic support and the outer base, as well as the inner elastic support and the inner base, are respectively connected through a groove and a protrusion, and a socket is formed at at least one end of the groove, so that the protrusion can be axially inserted into or pulled out of the groove through the socket.

[0012] In one embodiment of the piezoelectric stack vibration reduction device, the outer base is connected to the outer ring via a threaded fastener, and the inner base is connected to the inner ring via a threaded fastener.

[0013] In one embodiment of the piezoelectric stack vibration reduction device, an outer ring boss is provided on the inner periphery of the outer ring, an inner ring boss is provided on the outer periphery of the inner ring, the outer base is connected to the outer ring boss, and the inner base is connected to the inner ring boss.

[0014] In one embodiment of the piezoelectric stack vibration reduction device, the inner circumferential surface of the inner ring is provided with an inner ring conical surface area.

[0015] An embodiment of the piezoelectric stack vibration reduction device, the piezoelectric stack vibration reduction device also includes a support ring assembly, the support ring assembly includes a first support ring, a second support ring and a fastener, the first support ring and the second support ring are provided with connecting holes for connecting the fasteners, the first support ring and the second support ring cooperate to clamp the two ends of the outer ring under the fastening force of the fastener.

[0016] In one embodiment of the piezoelectric stack vibration reduction device, the first support ring and the second support ring are provided with axial through holes, and the plurality of axial through holes and the plurality of connecting holes are alternately staggered one by one along the circumferential direction.

[0017] In addition, the present application also provides a motor, which includes an outer shell and a piezoelectric stack vibration reduction device according to any one of claims 1 to 3, wherein the inner ring of the piezoelectric stack vibration reduction device is sleeved outside the outer shell.

[0018] In one embodiment of the motor, the outer circumferential surface of the outer shell is provided with an outer shell conical surface area, and the inner circumferential surface of the inner ring of the piezoelectric stack vibration reduction device is provided with an inner ring conical surface area. The inner ring conical surface area is sleeved outside the outer shell conical surface area and cooperates with the outer shell conical surface area to realize the positioning of the inner ring and the outer shell.

[0019] An embodiment of the motor, the piezoelectric stack vibration reduction device is the piezoelectric stack vibration reduction device described in the claim, the motor includes a long screw and a nut adapted to the long screw, the long screw is passed through the axial through hole of the support ring assembly, and the long screw is connected to the nuts at both ends of the axial through hole.

[0020] An embodiment of the motor includes a first end cover sealed at one end of the outer shell tube, a second end cover sealed at the other end of the outer shell tube, a first flange connected to the first end cover, and a second flange connected to the second end cover, wherein the two ends of the long screw are respectively passed through the connecting holes of the first flange and the connecting holes of the second flange, and nuts are connected at both ends, and the nuts at both ends are used to tighten the first flange and the second flange.

[0021] The piezoelectric stack vibration reduction device provided in this application has the advantages of good vibration and noise reduction effect, simple assembly, small overall size, light weight, high rigidity, and small change in the natural frequency of the motor structure after coupling with the motor. In addition, the resistance and inductance parameters in the piezoelectric stack external circuit can be adjusted to maximize the control of a certain order of howling noise of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of an embodiment of a motor provided in this application;

[0023] Figure 2 for Figure 1 AA sectional view;

[0024] Figure 3 for Figure 2 Magnified view of the portion within the middle circle;

[0025] Figure 4 A three-dimensional diagram of a support ring assembly of a piezoelectric stack vibration reduction device;

[0026] Figure 5 for Figure 4 A BB-section view of the first support ring;

[0027] Figure 6 for Figure 4 BB cross-sectional view of the second support ring

[0028] Figure 7 It is a three-dimensional diagram of the piezoelectric stack vibration reduction device;

[0029] Figure 8 A three-dimensional diagram of the piezoelectric stack vibration reduction device's outer ring, inner ring, outer elastic support, inner elastic support, outer base, inner base, and piezoelectric stack in assembled state;

[0030] Figure 9 A three-dimensional diagram of the inner base, inner ring, outer base, and outer ring of the piezoelectric stack vibration reduction device in assembled state;

[0031] Figure 10 A three-dimensional diagram of the outer ring of the piezoelectric stack vibration reduction device;

[0032] Figure 11 is a three-dimensional diagram of the inner ring of the piezoelectric stack vibration reduction device;

[0033] Figure 12 A three-dimensional diagram of an inner base or an outer base of a piezoelectric stack vibration reduction device;

[0034] Figure 13 This is a three-dimensional diagram of the assembled inner elastic support, outer elastic support and piezoelectric stack of the piezoelectric stack vibration reduction device.

[0035] The following are the descriptions of the reference numerals:

[0036] 100 motor, 101 outer shell, 101a outer shell conical surface area, 102 long screw, 103 nut, 104 first end cover, 105 second end cover, 106 first flange, 107 second flange;

[0037] 200 piezoelectric stack vibration reduction device, M vibration reduction assembly, 201 outer ring, 201a outer ring boss; 202 inner ring, 202a inner ring boss, 202b inner ring conical surface area, 203 piezoelectric stack, 203a outer end face, 203b inner end face, 204 inner elastic support, 205 outer elastic support, A pressure plate, B support arm, C protrusion, 206 outer base, 207 inner base, D groove, E socket, F seat hole, G threaded fastener, 208 support ring assembly, 2081 first support ring, 2082 second support ring, 2083 fastener, 2084 connecting hole, 2085 through hole. DETAILED DESCRIPTION

[0038] The present application provides a piezoelectric stack vibration reduction device that can be applied to a motor. When applied to a motor, the piezoelectric stack vibration reduction device can significantly improve the motor's vibration and noise issues. Furthermore, the present application also provides a motor that includes the piezoelectric stack vibration reduction device. To help those skilled in the art better understand the technical solutions of the present application, the piezoelectric stack vibration reduction device and motor provided by the present application are further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] like Figure 1 and Figure 2 The motor 100 includes an outer shell 101 and a piezoelectric stack vibration reduction device 200 , and the piezoelectric stack vibration reduction device 200 is sleeved outside the outer shell 101 .

[0040] In this embodiment, the motor 100 further includes a first end cap 104 and a second end cap 105, which respectively seal the ends of the outer casing 101. The motor 100 further includes a first flange 106 and a second flange 107. Both the first flange 106 and the second flange 107 are provided with threaded holes. The first flange 106 is connected to the first end cap 104 and one end of the outer casing 101 via the threaded holes and bolts passing through the threaded holes. The second flange 107 is connected to the second end cap 105 and the other end of the outer casing 101 via the threaded holes and bolts passing through the threaded holes.

[0041] In this embodiment, the motor 100 also includes a long screw 102 and a nut 103. Both the first flange 106 and the second flange 107 have connection holes. One end of the long screw 102 is inserted into the connection hole of the first flange 106, and the other end of the long screw 102 is inserted into the connection hole of the second flange 107. Furthermore, nuts 103 are connected at both ends of the long screw 102, which compress the first flange 106 and the second flange 107.

[0042] like Figure 4-Figure 6 In this embodiment, the piezoelectric stack vibration reduction device 200 is provided with a support ring assembly 208 for supporting. Of course, in some embodiments, the support ring assembly 208 may not be provided.

[0043] In this embodiment, the support ring assembly 208 includes a first support ring 2081 and a second support ring 2082. The first support ring 2081 and the second support ring 2082 are provided with a plurality of through holes 2085 and a plurality of connecting holes 2084. The through holes 2085 and the connecting holes 2084 are staggered along the circumferential direction.

[0044] like Figure 1The through holes 2085 of the first support ring 2081 and the through holes 2085 of the second support ring 2082 are axially aligned, and a long screw 102 is inserted through them. Nuts 103 are connected to the long screw 102 on either side of the first and second support rings 2081, 2082, and the nuts 103 on either side compress the first and second support rings 2081, 2082. The connecting holes 2084 of the first and second support rings 2081, 2082 are axially aligned, and fasteners 2083 are inserted through them to fasten the first and second support rings 2081, 2082 together. This connection structure uses the long screw 102 and the nut 103 to achieve axial positioning of the piezoelectric stack vibration reduction device 200. The axial position of the piezoelectric stack vibration reduction device 200 can be adjusted by loosening the nut 103. The axial position of the piezoelectric stack vibration reduction device 200 can be determined by performing vibration and noise simulation analysis on the motor 100.

[0045] like Figure 3 In this embodiment, the outer circumference of the outer shell 101 includes an outer shell conical surface region 101a. The inner circumference of the piezoelectric stack vibration damping device 200, i.e., the inner circumference of the inner ring 202, includes an inner ring conical surface region 202b. The inner ring conical surface region 202b is positioned outside the outer shell conical surface region 101a. The diameter of the inner ring conical surface region 202b and the diameter of the outer shell conical surface region 101a gradually decrease or increase in the same direction. The inner ring conical surface region 202b cooperates with the outer shell conical surface region 101a. This coordination between the outer shell conical surface region 101a and the inner ring conical surface region 202b achieves precise radial positioning of the piezoelectric stack vibration damping device 200, and further precisely positions the piezoelectric stack vibration damping device 200 in the axial direction.

[0046] like Figure 7 and Figure 8 The piezoelectric stack vibration reduction device 200 includes a vibration reduction assembly M, which comprises at least an outer ring 201, an inner ring 202, a piezoelectric stack 203, an inner elastic support 204, and an outer elastic support 205. The outer ring 201 is clamped by a first support ring 2081 and a second support ring 2082. The inner ring 202 is mounted inside the outer ring 201, forming an annular space with the outer ring 201. The piezoelectric stack 203, the inner elastic support 204, and the outer elastic support 205 are mounted within the annular space. The outer side of the outer elastic support 205 is connected to the outer ring 201, while the inner side of the inner elastic support 204 is connected to the inner ring 202. The inner side of the outer elastic support 205 is radially offset from the outer side of the inner elastic support 204. The piezoelectric stack 203 is connected between the inner side of the outer elastic support 205 and the outer side of the inner elastic support 204.

[0047] When the piezoelectric stack vibration damping device 200 is used, when the radial electromagnetic force is transmitted to the outer shell 101 of the motor 100 through the stator of the motor 100, causing the outer shell 101 to vibrate, the inner elastic support 204 and the outer elastic support 205 of the piezoelectric stack vibration damping device 200 squeeze the piezoelectric stack 203 under the action of the vibration force, causing the piezoelectric stack 203 to expand and contract radially. The piezoelectric stack 203 produces a positive piezoelectric effect, and under the action of the positive piezoelectric effect, the mechanical energy generated by the vibration is converted into electrical energy. The piezoelectric stack 203 is connected to an external circuit, and the external circuit has resistance elements and inductance elements connected in series or in parallel. The electrical energy is dissipated by the resistance elements in the external circuit, achieving effective control of vibration and noise. By adjusting the resistance parameters and inductance parameters in the external circuit, the control of a certain order of howling noise of the motor 100 can be maximized.

[0048] In this embodiment, the number of piezoelectric stacks 203, internal elastic supports 204 and external elastic supports 205 is respectively multiple, and each piezoelectric stack 203 is evenly spaced along the circumference, each internal elastic support 204 is evenly spaced along the circumference, and each external elastic support 205 is also evenly spaced along the circumference. Each piezoelectric stack 203 is correspondingly arranged between the outer side of an internal elastic support 204 and the inner side of an external elastic support 205. With this arrangement, during the vibration reduction and noise reduction process, the degree of expansion and contraction of the piezoelectric stacks 203 at different circumferential positions can be different, which can better consume the vibration forces in different radial directions. More preferably, the number of piezoelectric stacks 203 is an even number, and they are symmetrical about the circumferential center. In this way, the coupling effect of the piezoelectric stacks 203 can be fully utilized, and good vibration reduction and noise reduction effects can be achieved in different radial directions of the motor 100. Of course, in other embodiments, only one piezoelectric stack 203 , one inner elastic support 204 and one outer elastic support 205 may be provided, so that the piezoelectric stack 203 , the inner elastic support 204 and the outer elastic support 205 are distributed throughout the entire circumference.

[0049] like Figure 8 and Figure 9 In this embodiment, the piezoelectric stack vibration reduction device 200 also includes an inner base 207 and an outer base 206. The outer side of the outer elastic support 205 is connected to the outer base 206, and the outer base 206 is detachably mounted on the outer ring 201. The inner side of the inner elastic support 204 is connected to the inner base 207, and the inner base 207 is detachably mounted on the inner ring 202. Since the inner base 207 and the outer base 206 can be processed and formed independently of the inner ring 202 and the outer ring 201, it is relatively convenient to process a connecting structure for connecting the inner elastic support 204 and the outer elastic support 205 on the inner base 207 and the outer base 206. In addition, the inner base 207 and the outer base 206 can prevent the inner elastic support 204 and the outer elastic support 205 from wearing to the inner ring 202 and the outer ring 201 during the deformation process. When the inner base 207 and the outer base 206 are worn, the inner base 207 and the outer base 206 can be replaced.

[0050] Specifically, the inner elastic support 204 and the inner ring 202 as well as the outer elastic support 205 and the outer ring 201 can be detachably connected by threaded fasteners G. This connection method is stable, reliable and easy to assemble and disassemble. Of course, the detachable connection method is not limited to threaded connection, for example, it can also be a snap connection.

[0051] Specifically, such as Figure 10 and Figure 11 The outer ring 201 may be provided with an outer ring boss 201a on its inner circumference, and the inner ring 202 may be provided with an inner ring boss 202a on its outer circumference. The outer base 206 may be connected to the outer ring boss 201a, and the inner base 207 may be connected to the inner ring boss 202a. Providing the outer ring boss 201a and the inner ring boss 202a helps to enhance the structural strength of the outer ring 201 and the inner ring 202, ensures the structural strength of the connection between the outer base 206 and the outer ring 201, and the connection between the inner base 207 and the inner ring 202, and increases the overall stiffness of the piezoelectric stack vibration reduction device.

[0052] Specifically, the structures of the inner base 207 and the outer base 206 can be the same to facilitate batch processing and reduce processing costs.

[0053] Specifically, the inner base 207 and the inner elastic support 204 as well as the outer base 206 and the outer elastic support 205 can be plugged in through the groove D and the protrusion C respectively. Figure 12 and Figure 13 The groove D is provided on the inner base 207 or the outer base 206, and the protrusion C is provided on the inner elastic support 204 or the outer elastic support 205. Of course, the positions of the groove D and the protrusion C can be interchanged. Furthermore, the groove D has a socket E formed at at least one end, allowing the protrusion C to be axially inserted into or removed from the groove D through the socket E. This allows the inner elastic support 204 and the outer elastic support 205 to be assembled and disassembled without disassembling the other components of the piezoelectric stack vibration reduction device 200, making the assembly, disassembly, and maintenance of the entire piezoelectric stack vibration reduction device 200 more convenient.

[0054] Specifically, such as Figure 13 In this embodiment, pressure plates A are provided on the outer side of the inner elastic support 204 and the inner side of the outer elastic support 205. Pressure plates A are perpendicular to the radial direction. The outer end surface 203a and inner end surface 203b of the piezoelectric stack 203 mate with the pressure plates A of the inner elastic support 204 and the outer elastic support 205, respectively. The outer end surface 203a and inner end surface 203b of the piezoelectric stack 203 are perpendicular to the polarization direction of the piezoelectric stack 203. This ensures that when subjected to radial forces, the radial forces act evenly on the piezoelectric stack 203 through the pressure plates A, ensuring that the piezoelectric stack 203 is primarily subjected to radial forces and not circumferential shear forces, thus resolving the issue of the piezoelectric stack 203 being susceptible to failure due to shear forces.

[0055] Specifically, in this embodiment, both the inner elastic support 204 and the outer elastic support 205 are further provided with a support arm B. The inner end of the support arm B of the outer elastic support 205 is connected to the pressure plate A of the outer elastic support 205, and the outer end is directly connected to the outer ring 201 or indirectly connected to the outer ring 201 via the outer base 206. The outer end of the support arm B of the inner elastic support 204 is connected to the pressure plate A of the inner elastic support 204, and the inner end is directly connected to the inner ring 202 or indirectly connected to the inner ring 202 via the inner base 207. In this embodiment, the inner end of the support arm B of the inner elastic support 204 and the outer end of the support arm B of the outer elastic support 205 form a protrusion C, which plugs into the groove D on the inner base 207 and the outer base 206.

[0056] By providing a support arm B and utilizing the angle change of the support arm B relative to the pressure plate A to achieve elastic deformation of the inner elastic support 204 and the outer elastic support 205, the inner elastic support 204 and the outer elastic support 205 of this structure are more easily deformed when subjected to radial force, thereby being able to press the piezoelectric stack 203 even under the action of a smaller radial force, so that the smaller radial force can also be promptly converted into electrical energy by the piezoelectric stack 203. Preferably, the support arm B adopts a thin sheet structure, which is easier to deform. Preferably, the number of support arms B of the inner elastic support 204 and the outer elastic support 205 is multiple, and the inner end of each support arm B of the inner elastic support 204 is inclined relative to the outer end in a direction away from the pressure plate A, and the outer end of each support arm B of the outer elastic support 205 is inclined relative to the inner end in a direction away from the pressure plate A. This makes it easier to deform and easier to concentrate the force on the pressure plate A.

[0057] During assembly, the vibration reduction assembly M can be assembled first: first, the inner and outer end faces of the piezoelectric stack 203 are respectively pasted between the pressure plate A of the inner elastic support 204 and the pressure plate A of the outer elastic support 205, and then the inner base 207 and the outer base 206 are fixed to the inner ring boss 202a and the outer ring boss 201a with the threaded fastener 2083G, and then the inner elastic support 204 and the outer elastic support 205 assembled with the piezoelectric stack 203 are axially inserted into the grooves D of the inner base 207 and the outer base 206 respectively.

[0058] Then, the vibration damping assembly M is assembled outside the outer shell 101 of the motor 100 .

[0059] Then install the support ring assembly 208: first fix the first support ring 2081 and the second support ring 2082 with the threaded fastener 2083, then insert the long screw 102 into the through hole 2085 of the first support ring 2081 and the second support ring 2082, and then screw the nut 103 on the position of the long screw 102 on both sides of the first support ring 2081 and the second support ring 2082, and use the nuts 103 on both sides to tighten the first support ring 2081 and the second support ring 2082.

[0060] Then, the first flange 106 and the second flange 107 are installed, and nuts 103 are screwed onto both ends of the long screw 102 , and the nuts 103 at both ends are used to press the first flange 106 and the second flange 107 tightly.

[0061] Then, the first end cover 104 and the second end cover 105 are installed, and the first end cover 104 and the first flange 106 as well as the second end cover 105 and the second flange 107 are connected by bolts.

[0062] It should be noted that in the description of this application, the position relatively close to the circumferential center is referred to as the inner part, and the position relatively far from the circumferential center is referred to as the outer part.

[0063] In general, the piezoelectric stack vibration reduction device 200 provided in the present application has the advantages of good vibration reduction and noise reduction effect, simple assembly, small overall size, light weight, high rigidity, and small change in the natural frequency of the motor 100 structure after coupling with the motor 100. The resistance and inductance parameters in the external circuit of the piezoelectric stack 203 can be adjusted to maximize the control of a certain order of howling noise of the motor 100.

[0064] The principles and implementation methods of the present application have been described above using specific examples. The description of the above embodiments is only intended to help understand the method and core concept of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, various improvements and modifications may be made to the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A piezoelectric stack vibration reduction device, characterized in that: The piezoelectric stack vibration reduction device (200) comprises an outer ring (201), an inner ring (202), a piezoelectric stack (203), an inner elastic support (204) and an outer elastic support (205); the inner ring (202) is installed on the inner side of the outer ring (201) and forms an annular space with the outer ring (201); the piezoelectric stack (203), the inner elastic support (204) and the outer elastic support (205) are installed in the annular space; the outer side of the outer elastic support (205) is connected to the outer ring (201); the inner side of the inner elastic support (204) is connected to the inner ring (202); the inner side of the outer elastic support (205) and the outer side of the inner elastic support (204) are radially staggered; the piezoelectric stack (203) is connected between the inner side of the outer elastic support (205) and the outer side of the inner elastic support (204).

2. The piezoelectric stack vibration reduction device according to claim 1, characterized in that: The number of the piezoelectric stacks (203), the inner elastic supports (204) and the outer elastic supports (205) is respectively plural, and the piezoelectric stacks (203) are evenly spaced along the entire circumference, and each piezoelectric stack (203) is correspondingly arranged between an inner elastic support (204) and an outer elastic support (205).

3. The piezoelectric stack vibration reduction device according to claim 1, characterized in that: A pressure plate (A) is provided on the outer side of the inner elastic support (204) and the inner side of the outer elastic support (205), the pressure plate (A) being perpendicular to the radial direction, and the outer end surface (203a) and the inner end surface (203b) of the piezoelectric stack (203) are respectively fitted with the pressure plate (A) of the inner elastic support (204) and the pressure plate (A) of the outer elastic support (205); The inner elastic support (204) and the outer elastic support (205) are both provided with a support arm (B), the inner end of the support arm (B) of the outer elastic support (205) is connected to the pressure plate (A), and the outer end is connected to the outer ring (201), while the outer end of the support arm (B) of the inner elastic support (204) is connected to the pressure plate (A), and the inner end is connected to the inner ring (202), and elastic deformation is achieved by changing the angle of the support arm (B) relative to the pressure plate (A).

4. The piezoelectric stack vibration reduction device according to claim 3, characterized in that: The inner elastic support (204) and the outer elastic support (205) are both provided with a plurality of support arms (B), the inner end of each support arm (B) of the inner elastic support (204) is inclined relative to the outer end in a direction away from the pressure plate (A), and the outer end of each support arm (B) of the outer elastic support (205) is inclined relative to the inner end in a direction away from the pressure plate (A).

5. The piezoelectric stack vibration reduction device according to claim 1, characterized in that: The piezoelectric stack vibration reduction device (200) comprises an inner base (207) and an outer base (206), wherein the outer side of the outer elastic support (205) is connected to the outer base (206), and the outer base (206) is detachably mounted on the outer ring (201); the inner side of the inner elastic support (204) is connected to the inner base (207), and the inner base (207) is detachably mounted on the inner ring (202).

6. The piezoelectric stack vibration reduction device according to claim 5, characterized in that: The outer elastic support (205) and the outer base (206) as well as the inner elastic support (204) and the inner base (207) are plugged in respectively through a groove (D) and a protrusion (C); at least one end of the groove (D) forms a socket (E), so that the protrusion (C) can be inserted into or pulled out of the groove (D) along the axial direction through the socket (E).

7. The piezoelectric stack vibration reduction device according to claim 6, characterized in that: The outer base (206) is connected to the outer ring (201) via a threaded fastener (G), and the inner base (207) is connected to the inner ring (202) via a threaded fastener (G).

8. The piezoelectric stack vibration reduction device according to claim 7, characterized in that: The inner periphery of the outer ring (201) is provided with an outer ring boss (201a), the outer periphery of the inner ring (202) is provided with an inner ring boss (202a), the outer base (206) is connected to the outer ring boss (201a), and the inner base (207) is connected to the inner ring boss (202a).

9. The piezoelectric stack vibration reduction device according to claim 1, characterized in that: The inner circumference of the inner ring (202) is provided with an inner ring conical surface area (202b).

10. The piezoelectric stack vibration reduction device according to any one of claims 1 to 9, characterized in that: The piezoelectric stack vibration reduction device (200) further includes a support ring assembly (208), wherein the support ring assembly (208) includes a first support ring (2081), a second support ring (2082) and a fastener (2083), wherein the first support ring (2081) and the second support ring (2082) are provided with connection holes (2084) for connecting the fastener (2083), and the first support ring (2081) and the second support ring (2082) cooperate to clamp the two ends of the outer ring (201) under the fastening force of the fastener (2083).

11. The piezoelectric stack vibration reduction device according to claim 10, characterized in that: The first support ring (2081) and the second support ring (2082) are provided with axial through holes (2085), and the plurality of axial through holes (2085) and the plurality of connecting holes (2084) are alternately arranged one by one along the circumferential direction.

12. The motor is characterized in that The motor (100) comprises an outer shell (101) and a piezoelectric stack vibration reduction device (200) according to any one of claims 1 to 11, wherein an inner ring (202) of the piezoelectric stack vibration reduction device (200) is sleeved outside the outer shell (101).

13. The motor according to claim 12, characterized in that The outer circumference of the outer shell tube (101) is provided with an outer shell tube conical surface area (101a), and the inner circumference of the inner ring (202) of the piezoelectric stack vibration reduction device (200) is provided with an inner ring conical surface area (202b). The inner ring conical surface area (202b) is sleeved outside the outer shell tube conical surface area (101a) and cooperates with the outer shell tube conical surface area (101a) to achieve positioning of the inner ring (202) and the outer shell tube (101).

14. The motor according to claim 13, characterized in that The piezoelectric stack vibration reduction device (200) is the piezoelectric stack vibration reduction device (200) according to claim 11, the motor (100) includes a long screw rod (102) and a nut (103) adapted to the long screw rod (102), the long screw rod (102) is passed through the axial through hole (2085) of the support ring assembly (208), and the long screw rod (102) is connected to the nuts (103) at both ends of the axial through hole (2085).

15. The motor according to claim 14, characterized in that The motor (100) includes a first end cover (104) sealed at one end of the outer shell tube (101), a second end cover (105) sealed at the other end of the outer shell tube (101), a first flange (106) connected to the first end cover (104), and a second flange (107) connected to the second end cover (105). The two ends of the long screw (102) are respectively inserted into the connecting hole of the first flange (106) and the connecting hole of the second flange (107), and nuts (103) are connected at both ends. The nuts (103) at both ends are used to press the first flange (106) and the second flange (107).

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