CN-117706355-B - Miniature piezoelectric ring motor testing device and use method

CN117706355BCN 117706355 BCN117706355 BCN 117706355BCN-117706355-B

Abstract

A miniature piezoelectric ring motor testing device belongs to the field of miniature piezoelectric actuators and comprises a ring motor driving module, a ring motor stator adjusting module, a rotor pre-pressure and load adjusting module and a ring motor rotating speed measuring module. The high-frequency voltage signal generated by the driving module is input to the annular motor stator, the stator generates driving traveling wave through inverse piezoelectric effect to drive the rotor attached to the stator to rotate, the central shaft of the stator is enabled to coincide with the central shaft of the rotor through the adjusting module, the pre-pressure of the stator is accurately adjusted and the load is applied to the stator through the pre-pressure and load adjusting module, and the performance parameters of the rotor are accurately acquired in real time through the rotating speed measuring module and are analyzed and monitored in the upper computer in real time. The device avoids the test deviation generated by the eccentricity of the stator and the rotor of the annular motor and the test deviation generated by the uncomfortableness of the precompression in the test process, improves the test accuracy, and simultaneously, the related test variables (load, precompression, rotor material and the like) involved in the test process are easy to adjust, so that the test efficiency is greatly improved.

Inventors

WANG DAZHI
LI ZEFEI
DUAN YU
Yang Mingluo
KONG LINGJIE
LIANG SHIWEN
YU CHENGZHI

Assignees

大连理工大学
大连理工大学宁波研究院

Dates

Publication Date: 20260512
Application Date: 20231128

Claims (6)

1. The miniature piezoelectric ring motor testing device is characterized by comprising a ring motor driving module, a ring motor stator adjusting module, a ring motor precompression and load adjusting module and a ring motor rotating speed measuring module, wherein the ring motor stator adjusting module and the ring motor precompression and load adjusting module are connected to a substrate; The stator is driven by the driving traveling wave to rotate by the rotor, the central shaft of the stator is overlapped with the central shaft of the rotor by the annular motor stator adjusting module, the problem of eccentricity of the stator and the rotor is solved, the pre-pressure of the stator is accurately adjusted by the pre-pressure and load adjusting module, and the load is applied to the pre-pressure; The annular motor stator adjusting module comprises a stator adjusting double-shaft displacement table (3), a stator fixing clamp (4) and an annular motor stator (5), wherein the stator adjusting double-shaft displacement table (3) comprises a T-shaped connecting block and two groups of displacement tables, the T-shaped connecting block comprises a horizontal plane and a vertical plane, the first group of displacement tables are fixed below the horizontal plane and positioned on the surface of a base plate (16) and can be used for adjusting the position in the horizontal direction, the second group of displacement tables are fixed on the vertical plane and can be used for adjusting the position in the vertical direction, the stator fixing clamp (4) is connected with the displacement tables on the vertical plane of the T-shaped connecting block, and the annular motor stator (5) is connected and fixed on the stator fixing clamp (4); The annular motor pre-pressure and load adjusting module comprises a pre-pressure adjusting displacement (6), a T-shaped supporting table (7), a supporting block (8), a force application spring (9), a central shaft (10), a supporting shaft (11), a rotor (12), a bearing (13), a flexible rope (14) and a load frame (15), wherein the pre-pressure adjusting displacement (6) is fixed on a base plate (16), the T-shaped supporting table (7) is fixed on a moving plane of the pre-pressure adjusting displacement (6), a through hole is formed in the top end of the T-shaped supporting table (7), the supporting shaft (11) comprises four supporting shafts, one ends of the four supporting shafts are fixed in the supporting block (8), the other ends of the four supporting shafts penetrate through the through holes in the top end of the T-shaped supporting table (7) and are respectively sleeved with the force application spring (9) on the four supporting shafts (11), the central shaft (10) penetrates through the T-shaped supporting table (7) and the supporting block (8) and is fixedly connected with the supporting block (8), the central shaft (10) is arranged in the middle of the four supporting shafts (11), the rotor (12) is sleeved at the front end of the central shaft (10) and is reserved and a gap, the gap is reserved, the inner groove structure is reserved, the central shaft (10) is used for enabling the annular motor (5) to be in contact with the stator (5), the central shaft of the two is ensured to be kept on a straight line, the outer ring of the bearing (13) is sleeved in a groove of the rotor (12), the inner ring of the bearing (13) is sleeved on the central shaft (10) and is in interference fit, the load frame (15) is fixed on the outer side wall of the rotor (12) through a flexible rope (14) to provide gravity load, and the compression amount of the force application spring (9) is changed by adjusting the pre-compression force adjusting displacement (6), so that the pre-compression force applied on the annular motor stator (5) by the rotor (12) is changed.
2. The testing device of claim 1, wherein the testing device has the following specific structure: The annular motor driving module comprises a driving voltage generator (1) and a driving voltage amplifier (2), wherein the driving voltage generator (1) is connected with an annular motor stator (5) through the driving voltage amplifier (2); The annular motor rotating speed measuring module comprises a sensor magnetic stripe (17), a rotating speed sensor (18), a fixing clamp (19) and a PC upper computer (21), wherein the sensor magnetic stripe (17) is fixed on the outer side wall of a rotor (12), the rotating speed sensor (18) is fixed on a substrate (16) through the fixing clamp (19), the axis of the rotating speed sensor (18) is perpendicular to the rotating center of the rotor (12) and keeps a proper distance, and the rotating speed sensor (18) is connected with the PC upper computer (21).
3. The miniature piezoelectric ring motor testing device according to claim 2, wherein the probe of the rotation speed sensor (18) is positioned at a distance of 3-8 mm from the sensor magnetic strip (17).
4. The miniature piezoelectric ring motor testing device according to claim 2, wherein the stroke of the stator adjusting double-shaft displacement table (3) is more than 10mm, the sensitivity is less than or equal to 2 μm, the motion parallelism is less than or equal to 10 μm, the straightness is less than or equal to 3 μm, the stroke of the precompression adjusting displacement table (6) is more than 10mm, the sensitivity is less than or equal to 2 μm, the motion parallelism is less than or equal to 10 μm, and the straightness is less than or equal to 3 μm.
5. The miniature piezoelectric ring motor testing device according to claim 2, wherein the switching frequency of the rotation speed sensor (18) is 2Hz-10KHz, and the detection distance is 0.3-2mm.
6. A method of using the micro-piezoelectric ring motor testing device of any one of claims 1-5, comprising the steps of: 1) Annular motor stator pre-compression and load adjustment: The method comprises the steps that an annular motor stator (5) to be tested is fixedly arranged on a stator fixing clamp (4), the position of the stator fixing clamp (4) is changed by adjusting a stator adjusting double-shaft displacement table (3), and then the position of the annular motor stator (5) is changed, so that the center of the annular motor stator (5) is overlapped with the center of a rotor (12); The method comprises the steps of installing a rotor (12) at the front end of a central shaft (10), adding a load required to be used into a load frame (15), adjusting a pre-pressure adjusting displacement (6) to move the rotor (12) towards an annular motor stator (5) to enable the front end of the rotor (12) to be just contacted with the annular motor stator (5), calculating the compression amount of a force application spring (9) on a supporting shaft (11), adjusting the pre-pressure adjusting displacement (6) to enable a T-shaped supporting table (7) to continue to move, compressing the force application spring (9) between the T-shaped supporting table (7) and a supporting block (8), and applying pre-pressure to the annular motor stator (5) through the rotor (12); 2) Generation and output of ring motor excitation voltage signals: The driving voltage generator (1) adjusts the frequency to a preset frequency, outputs driving voltage to the driving voltage amplifier (2), adjusts the amplification factor of the driving voltage amplifier (2), and outputs a driving control signal to the annular motor stator (5); 3) Ring motor performance data acquisition and data analysis: The sensor magnetic stripe (17) is stuck on the outer side wall of the rotor (12), the probe position of the rotating speed sensor (18) is adjusted to a proper position with the distance between the sensor magnetic stripe (17), data sensed by the rotating speed sensor (18) is transmitted to the PC upper computer (21) through the communication interface, and the PC upper computer (21) calculates and displays the motion data.

Description

Miniature piezoelectric ring motor testing device and use method Technical Field The invention belongs to the field of miniature piezoelectric actuators, and particularly relates to a miniature piezoelectric annular motor testing device and a using method thereof. Background The piezoelectric micro-actuator is a device for converting electric energy into mechanical energy by adopting the inverse piezoelectric effect of piezoelectric materials, excites ultrasonic vibration of a stator in a specific frequency band, forms elliptical motion at a driving foot, and finally converts the vibration into driving force of a rotor through contact friction. The piezoelectric ring motor is a typical and very representative piezoelectric actuator, has the advantages of low-speed high-torque driving, high response speed, low requirements on working environment and the like, and has been successfully applied to the fields of consumer electronics, medical equipment, micro-nano positioning driving and the like. The accurate measurement of the performance output of the piezoelectric ring motor has great effect on evaluating and optimizing the performance of the piezoelectric ring motor, wherein the factors such as the pre-pressure of the ring motor, the position of the central shaft of the stator and the rotor and the like have great influence on the performance output of the ring motor. At present, the piezoelectric ring motor is tested by adopting a method of taking the gravity of the rotor as the pre-pressure, and the aim of adjusting the pre-pressure is achieved by manufacturing and replacing the rotors with different weights. In addition, the stator and rotor centers often have the problem of misalignment during the test. The above problems all affect the accurate measurement of the output performance of the ring motor. Disclosure of Invention The invention provides a miniature piezoelectric ring motor testing device, which aims to solve the problems that the adjustment of the precompression is inconvenient and the centers of a stator and a rotor are not coincident in the testing process. The stator position is adjusted by using the stator adjusting displacement table, so that the center of the stator is overlapped with the center of the rotor, and the problem of center eccentricity of the stator and the rotor in the testing process is solved. The spring is utilized to apply the precompression, so that the precompression is convenient to calculate and adjust, and the optimal precompression is obtained by changing the precompression value for a plurality of times in the test process. Through changing the load of different weights for stator output torque is easy to adjust in the test process, and annular motor rotor need not to dismantle in the test process simultaneously, avoids the device damage that numerous dismantlements brought. And the high-precision speed sensor is matched with the acquisition module to acquire data such as rotating speed and the like in the rotor testing process, and the data are transmitted to the upper computer in real time for data analysis. The miniature piezoelectric ring motor testing device has high measurement precision, and the testing variables (load, pre-pressure, rotor material and the like) are convenient to adjust, so that the testing efficiency is improved, and meanwhile, the damage to the piezoelectric motor device caused by repeated disassembly is avoided. In order to achieve the above purpose, the technical scheme of the invention is as follows: A testing device of a miniature piezoelectric ring motor comprises four parts, namely a ring motor driving module, a ring motor stator adjusting module, a ring motor precompression and load adjusting module and a ring motor rotating speed measuring module. The annular motor stator adjusting module and the annular motor pre-pressure and load adjusting module are reliably connected to the base plate through screws. The annular motor driving module comprises a driving voltage generator 1 and a driving voltage amplifier 2. The driving voltage generator 1 is used for controlling the frequency, waveform and phase of a driving control signal required by the annular motor stator 5, and the driving voltage amplifier 2 is used for amplifying the high-frequency alternating current driving control signal generated by the driving voltage generator 1 and finally outputting the amplified driving control signal to the annular motor stator 5. The annular motor stator adjusting module comprises a stator adjusting double-shaft displacement table 3, a stator fixing clamp 4 and an annular motor stator 5. The stator adjusting double-shaft displacement table 3 comprises a T-shaped connecting block and two groups of displacement tables, wherein the T-shaped connecting block is inversely placed and comprises a horizontal plane and a middle vertical plane, one group of displacement tables are fixed below the horizontal plane of the connecting block and are positio