A micro motor vibration control and friction reduction structure based on piezoelectric stack driving

Abstract

The present application relates to the technical field of micro motor, particularly relates to a kind of micro motor vibration control and antifriction structure based on piezoelectric stack drive, including stator frame, piezoelectric stack, fixed unit, drive unit and damping unit;The present application can solve the following problems existing in the current micro motor: the driving mode of expansion arm and rotor intermittent contact friction is prone to exert periodic impact friction on rotor, influence the running stability and positioning accuracy of micro motor, and can aggravate the wear of contact surface, shorten the service life of micro motor;Micro motor vibration impact cannot be inhibited, further reduce the running reliability and service life of micro motor;The present application can reduce the wear of parts by rolling abutment drive instead of contact friction, also can avoid the vibration caused by impact on rotor, and can absorb the vibration impact of the four peripheral sidewalls and end face of piezoelectric stack, can realize the vibration inhibition of piezoelectric stack in multiple directions, guarantee the running stability and service life of micro motor.

Description

Technical Field

[0001] This invention relates to the field of micro-motor technology, and in particular to a micro-motor vibration control and friction reduction structure based on piezoelectric stack drive. Background Technology

[0002] Piezoelectric drive technology realizes the direct conversion of electrical energy into mechanical energy based on the inverse piezoelectric effect of piezoelectric materials. Rotary micromotors driven by piezoelectric stacks have become the mainstream product form in the piezoelectric drive field due to their characteristics such as large output torque, simple structure, convenient assembly, and easy modular design, and are widely used in many fields.

[0003] In the prior art, those skilled in the art have also provided corresponding piezoelectric micromotors and driving methods. For example, Chinese Patent No. CN113014139A discloses a piezoelectric micromotor based on multi-stage flexible amplification and its driving method. The internal structure of the piezoelectric micromotor mainly consists of a rotor, a piezoelectric stack, an expansion arm, and a flexible hinge. When the micromotor is running, the piezoelectric stack elongates and deforms, driving the expansion arm to deflect. This causes the expansion arm to rotate at a certain angle along the flexible hinge, driving the rotor to rotate. Subsequently, the piezoelectric stack returns to its original length, the expansion arm resets, and separates from the rotor. This is one cycle. Through the continuous elongation and shortening deformation of the piezoelectric stack, the expansion arm can apply intermittent periodic drive to the rotor, realizing the continuous operation of the micromotor.

[0004] However, the micromotors provided by the above-mentioned prior art have the following shortcomings: 1. The above-mentioned prior art adopts a driving method of intermittent contact friction between the expansion arm and the rotor. The drive arm is prone to applying periodic impact friction force to the rotor, so it is impossible to achieve continuous and stable drive of the rotor. This results in the rotor generating high-frequency impact vibration during rotation. At the same time, the repeated friction contact between the drive arm and the rotor will aggravate the wear of the contact surface, shorten the service life of the micro motor, and affect the operating stability and positioning accuracy of the micro motor.

[0005] 2. During operation, micro motors are prone to vibration due to the combined effects of rotor contact friction and high-frequency expansion and contraction of piezoelectric stacks. The existing technologies mentioned above cannot suppress the vibration and impact of micro motors. As a result, the overall vibration amplitude of micro motors is large and the noise is high during operation, which further reduces the reliability and service life of micro motors and makes them unsuitable for precision electronic equipment.

[0006] Therefore, this invention proposes a structure for vibration control and friction reduction of micro motors to solve the problems of vibration and wear that are prone to occur in micro motors. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a micromotor vibration control and friction reduction structure based on piezoelectric stack drive. The structure includes a stator frame fitted around the rotor, with two mounting seats symmetrically arranged along the rotor center on the inner wall of the stator frame. A piezoelectric stack is housed within each mounting seat. The upper and lower ends of the stator frame are detachably covered with an encapsulation shell. A fixing unit, also symmetrically arranged along the rotor center on the inner wall of the stator frame, comprises multiple columns mounted on the inner wall of a positioning frame, with support plates at both ends of each column. A drive unit, mounted on the support plate near the piezoelectric stack, transmits the driving effect of the piezoelectric stack to the rotor in a doubly amplified manner. It uses a rolling contact drive instead of the traditional contact friction drive to control the rotor's high-speed rotation, effectively reducing friction-induced wear and preventing vibration caused by frictional contact. A vibration damping unit, located on the outer wall of the piezoelectric stack, reduces the vibration generated during the piezoelectric stack's operation. The synergistic effect of the drive unit and the vibration damping unit effectively suppresses the vibration of the micromotor.

[0008] Preferably, the drive unit includes a plurality of rotating shafts rotatably mounted between two support plates, a belt is sleeved between the plurality of rotating shafts, a wheel is fixedly sleeved on the outer wall of the rotating shaft, the axis of the wheel is parallel to that of the rotor, an anti-slip rubber sleeve is fixedly sleeved on the outer wall of the wheel and rolls against the outer wall of the rotor, and a linkage mechanism for driving the rotating shaft to rotate is installed on the side of the support plate near the piezoelectric stack.

[0009] Preferably, the linkage mechanism includes a mounting block disposed on the side of the two support plates near the piezoelectric stack. The mounting block has a circular groove inside, and a turntable is rotatably disposed inside the circular groove. A linkage shaft is rotatably disposed between the two support plates and connected to any one of the rotating shafts for belt drive. A transmission belt is respectively fitted between the turntable on the upper and lower sides and the linkage shaft. The radius of the turntable is larger than the radius of the linkage shaft. Two tensioning shafts for tensioning the transmission belt are also rotatably disposed between the two support plates.

[0010] Preferably, the linkage mechanism further includes a top plate installed at the drive end of the piezoelectric stack. A drive plate is provided at the end of the top plate away from the piezoelectric stack. Both ends of the drive plate are rotatably sleeved with swing rods through first bearings. Push-pull rods are rotatably installed at the ends of the two swing rods near the support plate through second bearings. Force blocks for driving the turntable to rotate are installed on the outer wall of the push-pull rods. A fulcrum is provided between the rocker arm and the packaged housing. The rocker arm consists of a drive section and a swing section, which are connected by the fulcrum. The fulcrum is located on the side of the rocker arm closer to the drive plate.

[0011] Preferably, a control shaft is fixedly disposed between the two turntables. The control shaft is rotatably mounted inside the mounting block via a third bearing. A through hole is provided inside the mounting block, passing through the axis of the turntable. A force-applying block is slidably engaged in the through hole on the outer wall of the push-pull rod. A control component for driving the turntable to rotate in one direction is disposed between the force-applying block and the control shaft.

[0012] Preferably, the fulcrum component includes a bracket installed on the inner wall of the encapsulation shell, two positioning pins are provided on the bracket, a third bearing is fixedly sleeved on the outer wall of the positioning pins, the driving section and swing section of the rocker arm are connected to the outer ring of the third bearing, a hard damping pad capable of producing a small deformation is provided in the middle of the driving section of the rocker arm, and multiple hard damping pads are provided on the swing section of the rocker arm.

[0013] Preferably, the control component includes a through hole opened on the force-applying block, a rotating shaft located inside the through hole, and a plurality of connecting plates evenly arranged circumferentially on the outer wall of the control shaft, with the side of the connecting plate away from the axis of the control shaft inclined in a clockwise direction; Multiple fixing plates are installed at equal intervals on both sides of the inner wall of the through hole that are parallel to its moving direction. A lever plate is rotatably mounted on the side of the fixing plate near the control shaft via a flexible pivot bearing. The fixing plate and the lever plate are inclined and arranged in the opposite direction of inclination to the connecting plate. The fixing plates and lever plates on both sides of the through hole are symmetrically arranged along the center of the control shaft. Multiple baffles are installed at equal intervals on the side of the fixing plate away from its inclination direction. The baffles abut against the outer wall of the lever plate.

[0014] Preferably, the outer wall of the dial plate is fixedly provided with a wear-resistant layer, the side of the dial plate away from the fixed plate is a longitudinally arranged arc-shaped convex surface, and the side of the connecting plate away from the control shaft is provided with a roller through a fourth bearing, and the roller makes rolling contact with the arc-shaped convex surface of the dial plate.

[0015] Preferably, the vibration damping unit includes an amplitude transfer plate disposed on the outer wall of the mounting base, the amplitude transfer plate surrounds the mounting base, a support cylinder is disposed on the inner wall of the stator frame, the piezoelectric stack is disposed inside the support cylinder, and an energy-absorbing damping pad that abuts against the amplitude transfer plate is installed on the inner wall of the support cylinder.

[0016] Preferably, the vibration damping unit further includes a fixing sleeve installed on the inner wall of the stator frame. The fixing sleeve covers the side of the piezoelectric stack near the top plate. Damping blocks are installed on the opposite sides of the fixing sleeve and the top plate. Multiple guide posts that slide through the fixing sleeve are installed on the top plate. Multiple grooves parallel to their axes are evenly opened on the guide posts. Multiple miniature balls that roll and abut against the grooves are rotatably arranged inside the fixing sleeve.

[0017] In summary, this application includes the following beneficial technical effects: I. This invention uses a drive section and a swing section whose lengths are multiples of each other to amplify the micron-level reciprocating stroke of the piezoelectric stack to the millimeter-level reciprocating stroke of the force-applying block. The force-applying block drives the turntable to rotate through a control component, and the rotation speed is amplified by the turntable and the rotating shaft whose radii are multiples of each other, so that the rotating shaft drives the rotating wheel to rotate at high speed. In this way, the micron-level reciprocating stretching and deformation of the piezoelectric stack can be amplified and converted into the high-speed rotation of the rotating wheel through the dual amplification drive of the swing arm's stroke amplification and the turntable's rotation speed amplification, thereby driving the rotor to rotate at high speed.

[0018] Second, the present invention replaces the existing drive arm and rotor contact friction by using the rolling contact drive between the wheel and the rotor. This can reduce the wear of components and ensure that both sides of the rotor always bear a balanced contact force, avoiding the impact and vibration caused by the contact between the drive arm and the rotor, thereby improving the stability of the rotor's initial rotation and high-speed rotation.

[0019] Third, the present invention uses the reciprocating force-applying block and the inclined plates on both sides inside to cooperate with the rollers arranged clockwise on the outer wall of the control shaft, which can drive the control shaft to rotate continuously in one direction, and then drive the rotor to rotate stably at high speed through the turntable and the wheel.

[0020] Fourth, this invention absorbs the vibration and impact of the piezoelectric stack's four sides and end faces through energy-absorbing damping pads and damping blocks, which can achieve multi-directional vibration suppression of the piezoelectric stack, significantly reducing the operating noise and vibration of the micromotor, which is beneficial to improving the operating stability and service life of the micromotor. Moreover, while suppressing vibration and impact, it will not have an adverse effect on the reciprocating deformation and output force of the piezoelectric stack, ensuring the normal drive output and operating accuracy of the micromotor. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the internal structure of the fixing unit of the present invention.

[0024] Figure 3 This is the present invention. Figure 2 A magnified view of part A.

[0025] Figure 4 This is the present invention. Figure 2 A magnified view of section B.

[0026] Figure 5 This is a structural diagram of the force-applying block and the control component of the present invention.

[0027] Figure 6 This is the present invention. Figure 5A magnified view of a portion of point C.

[0028] Figure 7 This is a schematic diagram of the vibration reduction unit of the present invention.

[0029] Figure 8 This is the present invention. Figure 7 A magnified view of a portion of point D.

[0030] In the diagram, 1. Stator frame; 2. Rotor; 3. Mounting base; 4. Piezoelectric stack; 5. Encapsulation shell; 6. Fixing unit; 61. Column; 62. Support plate; 7. Drive unit; 71. Rotary shaft; 72. Belt; 73. Pulley; 74. Anti-slip rubber sleeve; 75. Linkage mechanism; 751. Turntable; 752. Linkage shaft; 753. Transmission belt; 754. Clamping shaft; 755. Top plate; 756. Drive plate; 757. First bearing; 758. Swing rod; 759. Second bearing; 760. Push-pull rod; 761. Pivot component; 762. Control shaft; 763. Force application block; 764. Control component; 771. Bracket; 772. Positioning pin; 773. Third bearing; 774. Hard damping pad; 781. Through hole; 782. Connecting plate; 783. Fixing plate; 784. Flexible pivot bearing; 785. Paddle plate; 786. Baffle plate; 787. Roller; 8. Vibration damping unit; 81. Amplitude transfer plate; 82. Support cylinder; 83. Energy-absorbing damping pad; 84. Fixing sleeve; 85. Damping block; 86. Guide post; 87. Groove; 88. Miniature ball bearing. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-8 The embodiments of the present invention will be described in detail below.

[0032] This application discloses a vibration control and friction reduction structure for a micromotor based on piezoelectric stack drive. It should be noted that this application is mainly used to suppress vibration and friction during the expansion and contraction deformation of the piezoelectric stack 4. Technically, it can replace the existing drive arm's contact friction with the rotor 2 through the rolling contact drive between the wheel 73 and the rotor 2, reducing component wear. Specifically, when driving the rotor 2 to rotate, the micron-level reciprocating expansion and contraction deformation of the piezoelectric stack 4 is amplified and converted into high-speed rotation of the wheel 73 through a dual amplification drive, thereby driving the rotor 2 to rotate at high speed. Furthermore, this application can also absorb the vibration impact of the piezoelectric stack 4's surrounding sidewalls and end faces through a damping structure, achieving multi-directional vibration suppression of the piezoelectric stack 4, significantly reducing the operating noise and vibration of the micromotor, and improving the micromotor's operating stability and service life.

[0033] Reference Figure 1 and Figure 2As shown, a micro-motor vibration control and friction reduction structure based on piezoelectric stack drive includes a stator frame 1, sleeved on the outside of a rotor 2. Two mounting seats 3 are symmetrically arranged on the inner wall of the stator frame 1 along the center of the rotor 2. A piezoelectric stack 4 is disposed within each mounting seat 3. The upper and lower ends of the stator frame 1 are detachably covered with an encapsulation shell 5. A fixing unit 6 is also included, with two fixing units 6 symmetrically arranged on the inner wall of the stator frame 1 along the center of the rotor 2. Each fixing unit 6 includes multiple columns 61 mounted on the inner wall of the positioning frame 1, with support plates 62 at both the upper and lower ends of each column 61. A drive mechanism is also included. Unit 7 is installed on the side of the support plate 62 near the piezoelectric stack (4) to transmit the driving effect of the piezoelectric stack 4 to the rotor 2 in a doubly amplified manner, and to control the rotor 2 to rotate at high speed by rolling contact drive instead of traditional contact friction drive, effectively reducing wear caused by friction and avoiding vibration caused by impact generated by friction contact on the rotor 2; Vibration damping unit 8 is set on the outer wall of the piezoelectric stack 4 to reduce the vibration effect generated by the piezoelectric stack 4 during operation. The vibration of the micro motor is effectively suppressed by the synergistic effect of the drive unit 7 and the vibration damping unit 8.

[0034] In the specific implementation process, when the piezoelectric stack 4 undergoes elongation and contraction deformation under the drive signal, the reciprocating motion of the drive end of the piezoelectric stack 4 is converted into rotational motion by the drive unit 7, and the rotational motion is transmitted to the rotor 2, so that the rotor 2 is subjected to force and rotates at high speed. During this period, the vibration damping unit 8 can absorb the vibration impact generated by the high-frequency expansion and contraction of the piezoelectric stack 4, which can reduce the vibration amplitude of the micro motor from the source and ensure the stability of the micro motor during operation.

[0035] Reference Figure 2 , Figure 3 and Figure 4 As shown, in order to avoid impact on the rotor 2 when it is driven to rotate, a corresponding drive unit 7 is provided in this embodiment. Specifically, the drive unit 7 includes a plurality of rotating shafts 71 rotatably mounted between two support plates 62. A belt 72 is sleeved between the plurality of rotating shafts 71. A wheel 73 is fixedly sleeved on the outer wall of the rotating shaft 71. The axis of the wheel 73 is parallel to that of the rotor 2. An anti-slip rubber sleeve 74 is fixedly sleeved on the outer wall of the wheel 73 and rolls against the outer wall of the rotor 2. The anti-slip rubber sleeve 74 and the rotor 2 are interference-fitted to ensure that the rolling transmission is free from slippage. A linkage mechanism 75 for driving the rotating shafts 71 to rotate is installed on the side of the support plate 62 near the piezoelectric stack 4.

[0036] Furthermore, in this embodiment, the linkage mechanism 75 includes a mounting block disposed on the side of the two support plates 62 near the piezoelectric stack 4. A circular groove is opened inside the mounting block, and a turntable 751 is rotatably disposed inside the circular groove. A linkage shaft 752, which is rotatably connected to any one of the rotating shafts 71 for belt drive, is rotatably disposed between the two support plates 62. A transmission belt 753 is respectively fitted between the turntable 751 and the linkage shaft 752 on the upper and lower sides. It should be noted that the radius of the turntable 751 is larger than the radius of the linkage shaft 752. Preferably, the radius of the turntable 751 is 4-6 times larger than the radius of the linkage shaft 752. Two tensioning shafts 754 for tensioning the transmission belt 753 are also rotatably disposed between the two support plates 62. In addition, in order to extend the service life of the present invention, the belt 72 and the transmission belt 753 are preferably wear-resistant belts 72. The wear-resistant belt 72 adopts the prior art, which enhances the surface anti-friction ability through special materials and processes, which can effectively extend the service life and ensure transmission efficiency.

[0037] Furthermore, in this embodiment, the linkage mechanism 75 also includes a top plate 755 installed at the drive end of the piezoelectric stack 4. A drive plate 756 is provided at the end of the top plate 755 away from the piezoelectric stack 4. Both the upper and lower ends of the drive plate 756 are rotatably fitted with swing rods 758 via first bearings 757. Push-pull rods 760 are rotatably installed at the ends of the two swing rods 758 near the support plate 62 via second bearings 759. The outer wall of the push-pull rods 760 is fitted with a mechanism for driving the turntable 751 to rotate. A force-applying block 763; a fulcrum 761 is provided between the swing arm 758 and the encapsulation shell 5. The swing arm 758 consists of a driving section and a swinging section, which are connected by the fulcrum 761. The fulcrum 761 is located on the side of the swing arm 758 closer to the driving plate 756. That is, with the fulcrum 761 as the dividing line, the length of the force-bearing section of the swing arm 758 is less than the length of its force-applying section. Furthermore, the length of the force-applying section of the swing arm 758 is preferably 8-10 times that of the force-bearing section of the swing arm 758.

[0038] Furthermore, in this embodiment, a control shaft 762 is fixedly arranged between the two turntables 751. The control shaft 762 is rotatably mounted inside the mounting block via a third bearing 773. A through hole is opened inside the mounting block, passing through the axis of the turntables 751. A force-applying block 763 is slidably engaged in the through hole on the outer wall of the push-pull rod 760. A control component 764 for driving the turntables 751 to rotate in one direction is arranged between the force-applying block 763 and the control shaft 762.

[0039] In this embodiment, since the first bearing 757, the second bearing 759 and the third bearing 773 all need to operate at high speed for a long time, high-speed bearings suitable for high precision and high-speed rotation are preferred to ensure the stability of rotation.

[0040] In the specific implementation process, when the piezoelectric stack 4 undergoes elongation and contraction deformation under the driving signal, the top plate 755 drives the driving plate 756 to move back and forth at high frequency. The driving plate 756 applies a pushing and pulling force to the driving section of the swing rod 758. The driving section of the swing rod 758 drives the swing section to swing back and forth at high frequency through the fulcrum 761, so that the swing section drives the force application block 763 to move back and forth in the through hole through the push-pull rod 760. Since the length of the driving section of the swing rod 758 is less than the length of the swing section, the swing section can amplify the swing amplitude of the driving section, thereby amplifying the micron-level reciprocating stroke of the piezoelectric stack 4 to the force application block 763. 3. This increases the reciprocating stroke of the force-applying block 763 to the millimeter level. To reduce wear on the force-applying block 763, in this embodiment, a DLC coating is preferably applied to the outer wall of the force-applying block 763. The DLC coating has high hardness, low friction, and wear resistance, which can be used for the high-frequency reciprocating sliding of the force-applying block 763, extending the service life and stability of the force-applying block 763. During the reciprocating movement of the force-applying block 763, the control shaft 762 and the turntable 751 are driven to rotate in one direction at high frequency by the control component 764, and the force-applying block 763 with increased reciprocating stroke can provide sufficient driving force to the turntable 751.

[0041] The turntable 751 drives the rotating shaft 71 to rotate via the transmission belt 753. The rotating shaft 71 drives several rotating wheels 73 to rotate synchronously via the belt 72. The rotating wheels 73 on both sides of the rotor 2 rotate in the same direction. In addition, the radius of the turntable 751 is larger than the radius of the rotating shaft 71, which can amplify its rotational speed, so that the rotating shaft 71 drives the rotating wheels 73 to rotate at high speed. In this way, the micron-level reciprocating expansion and contraction deformation of the piezoelectric stack 4 can be amplified to the millimeter-level reciprocating motion of the force application block 763 through the dual amplification drive provided by the turntable 751 and the swing arm 758. Furthermore, the rotational speed of the turntable 751 is further amplified to the high-speed rotation of the rotating wheels 73, thereby driving the rotor 2 to rotate at high speed. In addition, the rolling contact drive between the rotating wheels 73 and the rotor 2 replaces the contact friction between the drive arm and the rotor 2 in the prior art, which can reduce the wear of the components and ensure that the rotor 2 always bears a balanced contact force, avoiding the impact and vibration caused by the contact between the drive arm and the rotor 2, thereby improving the stability of the rotor 2 in initial rotation and high-speed rotation.

[0042] It should be noted that the two piezoelectric stacks 4 use sinusoidal drive signals of the same phase with a phase difference of ≤1° to ensure that the two rotating wheels 73 drive the rotor 2 synchronously and in the same direction, thus avoiding uneven force on the rotor 2 and causing swaying.

[0043] Continue to refer to Figure 4As shown, since the rocker arm 758 needs to oscillate back and forth at high frequency, using a conventional fulcrum mechanism will easily lead to increased wear under high-frequency oscillation. Based on this, a fulcrum component 761 is provided in this embodiment. Specifically, the fulcrum component 761 includes a bracket 771 installed on the inner wall of the encapsulation housing 5. Two positioning pins 772 are provided on the bracket 771. A third bearing 773 is fixedly sleeved on the outer wall of the positioning pins 772. The driving section and the swing section of the rocker arm 758 are connected to the outer ring of the third bearing 773. The third bearing 773 is also a high-speed bearing. Since the driving section of the rocker arm 758 is relatively short, when the rocker arm 758 oscillates back and forth along the third bearing 773, the driving section... The swing segment has a smaller amplitude and requires a smaller amount of deformation. Therefore, a hard damping pad 774 capable of producing a small amount of deformation is provided in the middle of the drive segment of the swing arm 758. The swing segment of the swing arm 758 has a larger amplitude and requires a larger amount of deformation. Therefore, multiple hard damping pads 774 are provided on the swing segment of the swing arm 758. That is, the swing arm 758 integrates hard damping pads 774, which can elongate or compress when the drive segment and the swing segment at the end away from the third bearing 773 are restricted by the drive plate 756 and the force block 763 respectively and cannot perform arc-shaped movement, thus avoiding jamming. It also eliminates the need for the drive segment and the swing segment of the swing arm 758 to be designed as telescopic structures that are prone to aggravating wear.

[0044] Reference Figure 5 and Figure 6 As shown, in order to ensure the high-frequency stable rotation of rotor 2, it is necessary to ensure that the turntable 751, rotating shaft 71 and rotating wheel 73 rotate in one direction in this embodiment. Based on this, this embodiment provides a control component 764 that converts the reciprocating movement of the force-applying block 763 into driving the rotation of the turntable 751. Specifically, the control component 764 includes a through hole 781 opened on the force-applying block 763, the rotating shaft 71 is located inside the through hole 781, and a plurality of connecting plates 782 are evenly arranged circumferentially on the outer wall of the control shaft 762. The side of the connecting plate 782 away from the axis of the control shaft 762 Inclined in a clockwise direction; multiple fixing plates 783 are installed at equal intervals on both sides of the inner wall of the through hole 781 that are parallel to its moving direction. A lever 785 is rotatably mounted on the side of the fixing plate 783 near the control shaft 762 via a flexible pivot bearing 784. The fixing plate 783 and the lever 785 are inclined and arranged in the opposite direction to the inclination of the connecting plate 782. The fixing plates 783 and the lever 785 on both sides of the through hole 781 are symmetrically arranged along the center of the control shaft 762. Multiple baffles 786 are equally spaced on the side of the fixing plate 783 away from its inclination direction.

[0045] It should be noted that the flexible pivot bearing 784 used in this embodiment is prior art. It works by the torsional elastic deformation of two sets of orthogonal flat cross spring plates installed inside. After the external force is removed, the spring plates reset themselves. The flexible pivot bearing 784 drives the lever plate 785 to rotate away from its tilt direction. Therefore, in the initial state, the baffle plate 786 abuts against the outer wall of the lever plate 785, making the lever plate 785 flush with the side wall of the fixed plate 783.

[0046] Furthermore, in this embodiment, a wear-resistant layer is fixedly provided on the outer wall of the dial plate 785, preferably a coated DLC coating, which can reduce wear and extend service life. The side of the dial plate 785 away from the fixed plate 783 is a longitudinally arranged arc-shaped convex surface. The side of the connecting plate 782 away from the control shaft 762 is provided with a roller 787 rotatably arranged through a fourth bearing. The roller 787 rolls in contact with the arc-shaped convex surface of the dial plate 785. The fourth bearing is also a high-speed bearing.

[0047] In the specific implementation process, when the force-applying block 763 reciprocates, it drives the fixed plate 783 and the lever plate 785 to move synchronously. During the unidirectional movement of the force-applying block 763 in any direction, the lever plate 785 on one side of the force-applying block 763 comes into contact with the roller 787 in the counterclockwise direction. At this time, the lever plate 785 cannot swing to make way under the action of the baffle. Therefore, the lever plate 785 drives the control shaft 762 to rotate through the roller 787. The control shaft 762 drives the turntable 751, the rotating shaft 71, the rotating wheel 73 and the rotor 2 to rotate counterclockwise. The lever plate 785 on the other side of the force-applying block 763 comes into contact with the roller 787 in the clockwise direction. Since the control shaft 762 is rotating counterclockwise at this time, and the clockwise direction of the lever plate 785 is not rigidly limited, the lever plate 785 is squeezed by the roller 787 and swings back in the clockwise direction (in Figure 6 (As shown in the image).

[0048] When the force-applying block 763 moves in the opposite direction, the lever 785, which is in contact with the roller 787, comes into contact with the roller 787 in the clockwise direction and is squeezed back. Meanwhile, the lever 785 on the other side, under the action of the baffle 786, comes into contact with the roller 787 in the counterclockwise direction, thereby continuing to drive the control shaft 762 to rotate counterclockwise. Thus, through the reciprocating movement of the force-applying block 763, in conjunction with the lever 785 and the roller 787, the control shaft 762, turntable 751, wheel 73 and rotor 2 can be driven to rotate continuously in one direction, thereby ensuring the stable high-speed rotation of rotor 2. When the force-applying block 763 drives the fixed plate 783 and the lever 785 to reciprocate, the fixed plate 783 will not come into contact with the roller 787, thus avoiding jamming.

[0049] Reference Figure 7 and Figure 8As shown, since the piezoelectric stack 4 is prone to vibration during high-frequency expansion and contraction deformation, a vibration damping unit 8 is provided in this embodiment. Specifically, the vibration damping unit 8 includes an amplitude transfer plate 81 disposed on the outer wall of the mounting base 3. The amplitude transfer plate 81 surrounds the mounting base 3. A support cylinder 82 is disposed on the inner wall of the stator frame 1. The piezoelectric stack 4 is disposed inside the support cylinder 82. An energy-absorbing damping pad 83 that abuts against the amplitude transfer plate 81 is installed on the inner wall of the support cylinder 82.

[0050] Furthermore, in this embodiment, the vibration damping unit 8 also includes a fixing sleeve 84 installed on the inner wall of the stator frame 1. The fixing sleeve 84 covers the side of the piezoelectric stack 4 near the top plate 755. Damping blocks 85 are installed on the opposite sides of the fixing sleeve 84 and the top plate 755. Multiple guide posts 86 that slide through the fixing sleeve 84 are installed on the top plate 755. In order to reduce the sliding friction between the guide posts 86 and the top plate 755, multiple grooves 87 parallel to their axes are evenly opened on the guide posts 86 in this embodiment. Multiple miniature balls 88 that roll and abut against the grooves 87 are rotatably arranged inside the fixing sleeve 84.

[0051] In the specific implementation process, when the piezoelectric stack 4 undergoes elongation and contraction deformation, the energy-absorbing damping pad 83 can absorb the vibration impact generated by the axial reciprocating deformation of the four sides of the piezoelectric stack 4, effectively blocking the transmission path of the vibration impact to the stator frame 1, and significantly reducing the vibration of the micro motor. The energy-absorbing damping pad 83 only has a damping and suppression effect on the vibration impact of the piezoelectric stack 4, and will not have an adverse effect on the reciprocating deformation and output force of the piezoelectric stack 4, thus ensuring the normal drive output and operating accuracy of the micro motor.

[0052] Furthermore, the fixed sleeve 84 and the damping blocks 85 on its sidewalls do not move. Therefore, when the piezoelectric stack 4 drives the top plate 755 to reciprocate, it drives the damping blocks 85 on its sidewalls to reciprocate synchronously, causing the two damping blocks 85 to repeatedly abut against each other. It should be noted that the initial gap between the two damping blocks 85 is equal to 95%-98% of the rated elongation of the piezoelectric stack 4. The adjustment of the initial gap of the damping blocks 85 can refer to the fine-tooth micro-adjustment screw method in the prior art, that is, using the small lead of the ultra-fine tooth precision screw, the rotational motion of the screw is converted into the axial micro-displacement of the damping block 85, and the gap adjustment at the sub-micron level is achieved by controlling the rotation angle. When the piezoelectric stack 4 shrinks to near its shortest length, the two damping blocks 85 abut against each other and absorb the impact vibration generated by the axial shrinkage of the end face of the piezoelectric stack 4. Therefore, the damping blocks 85 can only absorb the vibration impact generated when the piezoelectric stack 4 shrinks, and will not hinder the elongation deformation and output force of the piezoelectric stack 4.

[0053] In summary, by absorbing the vibration and impact of the piezoelectric stack 4 on its four sides and end face through the energy-absorbing damping pad 83 and the damping block 85, the vibration of the piezoelectric stack 4 can be suppressed in multiple directions, which can significantly reduce the operating noise and vibration of the micro motor and help improve the operating stability and service life of the micro motor.

[0054] During operation: When the piezoelectric stack 4 undergoes elongation and contraction deformation under the drive signal, the top plate 755 drives the drive plate 756 to move back and forth at high frequency. The drive plate 756 drives the swing section to swing back and forth at high frequency through the drive section of the swing rod 758. The swing section can amplify the swing amplitude of the drive section, thereby amplifying the micron-level reciprocating stroke of the piezoelectric stack 4 to the force application block 763, making the force application block 763 increase to the millimeter-level reciprocating stroke. The force application block 763 drives the control shaft 762 and the turntable 751 to rotate unidirectionally at high frequency through the control component 764.

[0055] The turntable 751 drives the rotating shaft 71 to rotate via the transmission belt 753, and the turntable 751 amplifies the rotational speed of the rotating shaft 71, causing the rotating shaft 71 to drive the rotating wheel 73 to rotate at high speed, thereby driving the rotor 2 to rotate at high speed. The rolling contact drive between the rotating wheel 73 and the rotor 2 replaces the contact friction between the drive arm and the rotor 2 in the prior art, which can reduce the wear of the components and ensure that the rotor 2 always bears a balanced contact force on both sides, thereby improving the stability of the rotor 2 during initial rotation and high-speed rotation.

[0056] When the piezoelectric stack 4 undergoes elongation and contraction deformation, the energy-absorbing damping pad 83 can absorb the vibration and impact generated by the axial reciprocating deformation of the piezoelectric stack 4's surrounding sidewalls. When the piezoelectric stack 4 contracts to near its shortest length, the two damping blocks 85 abut against each other and absorb the impact vibration generated by the axial contraction of the piezoelectric stack 4's end face. This effectively suppresses the vibration and impact generated by the surrounding sidewalls and end face of the piezoelectric stack 4, significantly reducing the operating noise and vibration of the micromotor, which is beneficial to improving the operating stability and service life of the micromotor, and will not have an adverse effect on the reciprocating deformation and output force of the piezoelectric stack 4, ensuring the normal drive output and operating accuracy of the micromotor.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A micro-motor vibration control and friction reduction structure based on piezoelectric stack drive, characterized in that, include: The stator frame (1) is fitted on the outside of the rotor (2). Two mounting seats (3) are symmetrically arranged on the inner wall of the stator frame (1) along the center of the rotor (2). Piezoelectric stacks (4) are arranged in the mounting seats (3). The upper and lower ends of the stator frame (1) are covered with encapsulation shells (5) in a detachable manner. The fixing unit (6) is symmetrically arranged on the inner wall of the stator frame (1) along the center of the rotor (2). The fixing unit (6) includes multiple columns (61) installed on the inner wall of the positioning frame (1). Support plates (62) are provided at both the upper and lower ends of the columns (61). The drive unit (7) is installed on the side of the support plate (62) near the piezoelectric stack (4). It is used to transmit the driving effect of the piezoelectric stack (4) to the rotor (2) in a doubly amplified manner, and replace the traditional contact friction drive with a rolling contact drive to control the rotor (2) to rotate at high speed, effectively reducing wear caused by friction and avoiding vibration caused by the impact of friction contact on the rotor. The vibration damping unit (8) is set on the outer wall of the piezoelectric stack (4) to reduce the vibration effect generated during the operation of the piezoelectric stack (4). The vibration of the micro motor is effectively suppressed by the synergistic effect of the drive unit (7) and the vibration damping unit (8).

2. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 1, characterized in that: The drive unit (7) includes several rotating shafts (71) rotatably mounted between two support plates (62), belts (72) are sleeved between the several rotating shafts (71), and a rotating wheel (73) is fixedly sleeved on the outer wall of the rotating shaft (71). The axis of the rotating wheel (73) is parallel to that of the rotor (2). The outer wall of the rotating wheel (73) is fixedly sleeved with an anti-slip rubber sleeve (74) that rolls against the outer wall of the rotor (2). A linkage mechanism (75) for driving the rotating shaft (71) to rotate is installed on the side of the support plate (62) near the piezoelectric stack (4).

3. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 2, characterized in that: The linkage mechanism (75) includes a mounting block disposed on the side of the two support plates (62) near the piezoelectric stack (4). The mounting block has symmetrically arranged circular grooves on the upper and lower sides. A turntable (751) is rotatably disposed inside the circular groove. A linkage shaft (752) is rotatably disposed between the two support plates (62) and connected to any one of the rotating shafts (71) for belt drive. A transmission belt (753) is respectively sleeved between the turntable (751) and the linkage shaft (752) on the upper and lower sides. The radius of the turntable (751) is larger than the radius of the linkage shaft (752). Two tensioning shafts (754) for tensioning the transmission belt (753) are also rotatably disposed between the two support plates (62).

4. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 2, characterized in that: The linkage mechanism (75) also includes a top plate (755) installed at the drive end of the piezoelectric stack (4). A drive plate (756) is provided at the end of the top plate (755) away from the piezoelectric stack (4). Both the upper and lower ends of the drive plate (756) are rotatably sleeved with swing rods (758) through the first bearing (757). Push-pull rods (760) are rotatably installed at the ends of the two swing rods (758) near the support plate (62) through the second bearing (759). Force blocks (763) for driving the turntable (751) to rotate are installed on the outer wall of the push-pull rods (760). A fulcrum (761) is provided between the rocker arm (758) and the encapsulation shell (5). The rocker arm (758) consists of a drive section and a swing section. The drive section and the swing section are connected by the fulcrum (761). The fulcrum (761) is located on the side of the rocker arm (758) close to the drive plate (756).

5. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 4, characterized in that: A control shaft (762) is fixedly arranged between the two turntables (751). The control shaft (762) is rotatably mounted inside the mounting block via a third bearing (773). A through hole is provided inside the mounting block, passing through the axis of the turntable (751). A force-applying block (763) is installed on the outer wall of the push-pull rod (760) and slidably docked in the through hole. A control component (764) for driving the turntable (751) to rotate in one direction is provided between the force-applying block (763) and the control shaft (762).

6. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 4, characterized in that: The fulcrum component (761) includes a bracket (771) installed on the inner wall of the encapsulation shell (5). Two positioning pins (772) are provided on the bracket (771). A third bearing (773) is fixedly sleeved on the outer wall of the positioning pins (772). The driving section and swing section of the rocker arm (758) are connected to the outer ring of the third bearing (773). A hard damping pad (774) capable of producing a small deformation is provided in the middle of the driving section of the rocker arm (758). Multiple hard damping pads (774) are provided on the swing section of the rocker arm (758).

7. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 5, characterized in that: The control component (764) includes a through hole (781) opened on the force application block (763), the rotating shaft (71) is located inside the through hole (781), and a plurality of connecting plates (782) are evenly arranged on the outer wall of the control shaft (762). The side of the connecting plate (782) away from the axis of the control shaft (762) is inclined in a clockwise direction. Multiple fixing plates (783) are installed at equal intervals on both sides of the inner wall of the through hole (781) parallel to its moving direction. A lever plate (785) is rotatably mounted on the side of the fixing plate (783) near the control shaft (762) via a flexible pivot bearing (784). The fixing plate (783) and the lever plate (785) are inclined and arranged in the opposite direction to the inclination of the connecting plate (782). The fixing plates (783) and the lever plate (785) on both sides of the through hole (781) are symmetrically arranged along the center of the control shaft (762). Multiple baffles (786) are equally spaced on the side of the fixing plate (783) away from its inclination direction. The baffles (786) abut against the outer wall of the lever plate (785).

8. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 7, characterized in that: The outer wall of the dial plate (785) is fixedly provided with a wear-resistant layer. The side of the dial plate (785) away from the fixed plate (783) is a longitudinally arranged arc-shaped convex surface. The side of the connecting plate (782) away from the control shaft (762) is provided with a roller (787) through a fourth bearing. The roller (787) makes rolling contact with the arc-shaped convex surface of the dial plate (785).

9. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 1, characterized in that: The vibration damping unit (8) includes an amplitude transfer plate (81) disposed on the outer wall of the mounting base (3). The amplitude transfer plate (81) surrounds the mounting base (3). A support cylinder (82) is disposed on the inner wall of the stator frame (1). The piezoelectric stack (4) is disposed inside the support cylinder (82). An energy-absorbing damping pad (83) that abuts against the amplitude transfer plate (81) is installed on the inner wall of the support cylinder (82).

10. The micro-motor vibration control and friction reduction structure based on piezoelectric stack drive according to claim 4, characterized in that: The vibration damping unit (8) also includes a fixing sleeve (84) installed on the inner wall of the stator frame (1). The fixing sleeve (84) covers the piezoelectric stack (4) on the side near the top plate (755). Damping blocks (85) are installed on the opposite sides of the fixing sleeve (84) and the top plate (755). Multiple guide posts (86) that slide through the fixing sleeve (84) are installed on the top plate (755). Multiple grooves (87) parallel to their axes are evenly opened on the guide posts (86). Multiple miniature balls (88) that roll against the grooves (87) are rotatably arranged inside the fixing sleeve (84).

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