scholarly journals Design of a Low-Frequency Harmonic Rotary Piezoelectric Actuator

Actuators ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 4
Author(s):  
Kang Liang ◽  
Chong Li ◽  
Yujian Tong ◽  
Jiwen Fang ◽  
Wei Zhong
Keyword(s):  
Piezoelectric Actuator ◽  
Harmonic Wave ◽  
Low Frequency ◽  
Experimental System ◽  
Piezoelectric Actuators ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Output Characteristics ◽  
Driving Signal ◽  
Harmonic Displacement

Piezoelectric actuators usually operate under a high frequency driving signal. Here we report a harmonic rotating piezoelectric actuator by coupling a harmonic wave generator and a friction rotor, in which the actuator can be actuated by a low-frequency sinusoidal signal with positive bias. The harmonic wave is generated by a two-stage magnifying mechanism consisting of a displacement amplifier and a harmonic rod. Applying piezoelectricity theory, the actuator’s output characteristic equations are deduced. What is more, the output characteristics of piezoelectric actuators are tested with the established experimental system. Results show that the generated harmonic displacements can drive the actuator to work normally at a driving voltage of larger than 90 V and the maximum total harmonic displacement of the piezoelectric actuator comes up to 427.6 μm under the driving voltage of 150 V. Meanwhile, the error between the measured and calculated values of the harmonic displacement is less than 7%. Furthermore, the rotational speed of the piezoelectric actuator reaches 5.45 rpm/min at 150 V voltage and 5 Hz driving frequency.

scholarly journals Simulation of Motion Interactions of a 2-DOF Linear Piezoelectric Impact Drive Mechanism with a Single Friction Interface

2018 ◽  
Vol 8 (8) ◽  
pp. 1400 ◽  
Author(s):  
Haojie Xia ◽  
Liling Han ◽  
Chengliang Pan ◽  
Huakun Jia ◽  
Liandong Yu
Keyword(s):  
High Frequency ◽  
Degrees Of Freedom ◽  
Low Frequency ◽  
Piezoelectric Actuators ◽  
Friction Model ◽  
Duty Ratio ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Coupled Motion ◽  
Drive Mechanism

A two-degrees-of-freedom (2-DOF) linear piezoelectric impact drive mechanism (PIDM) is actuated by two independent piezoelectric actuators (PAs). The coupled motion interactions of a two orthogonal DOF linear PIDM with a single friction interface are introduced and analyzed. A complete dynamic model of the 2-DOF PIDM is established with the Karnopp friction model considering the distribution of friction in the x-axis and y-axis. The output displacements of the 2-DOF PIDM and two corresponding independent 1-DOF PIDMs are investigated numerically. When the two input exciting signals of a 2-DOF PIDM have the same driving voltage of 100 V with a duty ratio of 98% at 10 Hz and two 1-DOF PIDMs are driving under the same conditions, the step displacements in the two axes of 2-DOF PIDM are improved compared to the corresponding 1-DOF PIDM. When the two input exciting signals of a 2-DOF PIDM have the same driving voltages of 100 V with a duty ratio of 98% but the driving frequency is 10 Hz in the x-axis and 20 Hz in the y-axis, the results show that the displacement of high frequency achieves a slight decrease and displacement of low frequency shows a large increase compared to the two corresponding 1-DOF PIDMs.

scholarly journals A Novel Rotation-Structure Based Stick-Slip Piezoelectric Actuator with High Consistency in Forward and Reverse Motions

Actuators ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 189
Author(s):  
Jizhou Tang ◽  
Jingsong Wei ◽  
Yuming Wang ◽  
Zhi Xu ◽  
Hu Huang
Keyword(s):  
Piezoelectric Actuator ◽  
Piezoelectric Actuators ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Maximum Displacement ◽  
Stick Slip ◽  
Reverse Motion ◽  
Symmetric Structure ◽  
Deviation Rate ◽  
High Consistency

Under the same driving voltage and frequency, the forward and reverse motion inconsistency of stick-slip piezoelectric actuators would bring difficulty for subsequent control. To solve this problem, a rotation-structure based piezoelectric actuator with completely symmetric structure and two driving feet was initially proposed. By testing its output performances under various driving voltages and frequencies, it was confirmed that, although similar speeds could be achieved for forward and reverse motions, the maximum displacement and backward displacement in each step were still quite different. By analyzing the reasons leading to this difference, this actuator was further improved by using only one driving foot. The experimental results showed that the forward and reverse motion consistency of the improved actuator had been significantly improved. The deviation rate was only 1.6%, corresponding to a travel distance of 118.7 μm, obtained under the driving voltage of 100 V and driving frequency of 10 Hz. The comparison with some previously reported actuators further confirmed the advancement of this improved actuator.

Performance Evaluation of Numerical Finite Element Coupled Algorithms for Structure–Electric Interaction Analysis of MEMS Piezoelectric Actuator

2019 ◽  
Vol 16 (07) ◽  
pp. 1850106 ◽  
Author(s):  
Prakasha Chigahalli Ramegowda ◽  
Daisuke Ishihara ◽  
Tomoya Niho ◽  
Tomoyoshi Horie
Keyword(s):  
Finite Element ◽  
Piezoelectric Actuator ◽  
3D Structure ◽  
Time Integration ◽  
Low Frequency ◽  
Piezoelectric Actuators ◽  
Piezoelectric Bimorph ◽  
Iterative Coupling ◽  
Electric Interaction ◽  
Numerical Finite Element

This work presents multiphysics numerical analysis of piezoelectric actuators realized using the finite element method (FEM) and their performances to analyze the structure-electric interaction in three-dimensional (3D) piezoelectric continua. Here, we choose the piezoelectric bimorph actuator without the metal shim and with the metal shim as low-frequency problems and a surface acoustic wave device as a high-frequency problem. More attention is given to low-frequency problems because in our application micro air vehicle’s wings are actuated by piezoelectric bimorph actuators at low frequency. We employed the Newmark’s time integration and the central difference time integration to study the dynamic response of piezoelectric actuators. Monolithic coupling, noniterative partitioned coupling and partitioned iterative coupling schemes are presented. In partitioned iterative coupling schemes, the block Jacobi and the block Gauss–Seidel methods are employed. Resonance characteristics are very important in micro-electro-mechanical system (MEMS) applications. Therefore, using our proposed coupled algorithms, the resonance characteristics of bimorph actuator is analyzed. Comparison of the accuracy and computational efficiency of the proposed numerical finite element coupled algorithms have been carried out for 3D structure–electric interaction problems of a piezoelectric actuator. The numerical results obtained by the proposed algorithms are in good agreement with the theoretical solutions.

scholarly journals A Novel Stick-Slip Type Rotary Piezoelectric Actuator

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Yuan Wang ◽  
Minglong Xu ◽  
Shubao Shao ◽  
Siyang Song ◽  
Yan Shao
Keyword(s):  
Piezoelectric Actuator ◽  
Experimental System ◽  
Driving Voltage ◽  
Stick Slip ◽  
Piezoelectric Stacks ◽  
Long Stroke ◽  
Fine Resolution ◽  
Stick Slip Motion ◽  
Slip Motion ◽  
Sawtooth Waveform

A novel stick-slip rotary piezoelectric actuator is designed for optical use. The actuator is proposed, fabricated, and tested with the aim of realizing both fine resolution and a long stroke. The dynamic model of the actuator is established, and simulations are performed to discover how the input driving voltage affects the stick-slip motion of the actuator. An experimental system is built to evaluate the performance of the actuator at different frequencies, voltages, and numbers of driving piezoelectric stacks. Experimental results show that the minimal output stepping angle is 3.5 μrad (0.2 millidegrees) under a sawtooth waveform having a voltage of 13 V and frequency of 3000 Hz and that the velocity reaches 0.44 rad/s (25°/s) under a sawtooth waveform having a voltage of 93 V and frequency of 3000 Hz, while the stroke is infinite. The proposed actuator provides stable and accurate rotary motion and realizes a high velocity.

scholarly journals A Novel Impact Rotary–Linear Motor Based on Decomposed Screw-Type Motion of Piezoelectric Actuator

2018 ◽  
Vol 8 (12) ◽  
pp. 2492
Author(s):  
Liling Han ◽  
Liandong Yu ◽  
Chengliang Pan ◽  
Huining Zhao ◽  
Yizhou Jiang
Keyword(s):  
Piezoelectric Actuator ◽  
Degree Of Freedom ◽  
Rotary Motion ◽  
Maximum Diameter ◽  
Torsional Angle ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Linear Motion ◽  
Longitudinal Displacement ◽  
Two Degree Of Freedom

A novel impact two-degree-of-freedom (2-DOF) motor based on the decomposed screw-type motion of a piezoelectric actuator (PA) has been proposed. The fabricated prototype motor has a maximum diameter of 15 mm and a length of 100 mm which can produce a maximum torsional angle of about 1000 μrad and a maximum longitudinal displacement of about 1.03 μm under a saw-shaped driving voltage with 720 Vp-p (peak-to-peak driving voltage). When the axial prepressure generated by the spring is about 1N and the radial prepressure generated by the snap ring is about 14 N, the fabricated motor realizes rotary motion with the driving frequency from 200 Hz to 4 kHz. When the axial prepressure generated by the spring is about 11.7 N and the radial prepressure generated by the snap ring is about 21.1 N, the fabricated motor realizes linear motion with the driving frequency from 2 kHz to 11 kHz. In the experiments, the prototype motor can achieve 9.9 × 105 μrad/s rotary velocity at 2 kHz and it can achieve 2.4 mm/s linear velocity at 11 kHz under the driving voltage of 720 Vp-p.

scholarly journals A Microfluidic Rotational Motor Driven by Circular Vibrations

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 809 ◽  
Author(s):  
Suzana Uran ◽  
Božidar Bratina ◽  
Riko Šafarič
Keyword(s):  
Theoretical Model ◽  
Piezoelectric Actuator ◽  
Rotational Speed ◽  
Water Droplet ◽  
Low Frequency ◽  
Piezoelectric Actuators ◽  
Frequency Region ◽  
Practical Application ◽  
3D Printed ◽  
Electro Wetting

Constructing micro-sized machines always involves the problem of how to bring the energy (electric, magnetic, light, electro wetting, vibrational, etc.) source to the device to produce mechanical movements. The paper presents a rotational micro-sized motor (the diameter of the rotor is 350 µm) driven by low frequency (200–700 Hz) circular vibrations, made by two piezoelectric actuators, through the medium of a water droplet with diameter of 1 mm (volume 3.6 µL). The theoretical model presents how to produce the circular streaming (rotation) of the liquid around an infinitely long pillar with micro-sized diameter. The practical application has been focused to make a time-stable circular stream of the medium around the finite long vibrated pillar with diameter of 80 µm in the presence of disturbances produced by the vibrated plate where the pillar is placed. Only the time-stable circular stream in the water droplet around the pillar produces enough energy to rotate the micro-sized rotor. The rotational speed of the rotor is controlled in both directions from −20 rad/s to +26 rad/s. 3D printed mechanical amplifiers of vibrations, driven by piezoelectric actuators, amplify the amplitude of the piezoelectric actuator up to 20 µm in the frequency region of 200 to 700 Hz.

Novel design, analytical and experimental studies of a piezoelectric ultrasonic linear actuator based on binate feet driving

2017 ◽  
Vol 29 (5) ◽  
pp. 787-799 ◽  
Author(s):  
Shupeng Wang ◽  
Weibin Rong ◽  
Lefeng Wang ◽  
Zhichao Pei ◽  
Lining Sun
Keyword(s):  
Experimental Studies ◽  
Experimental System ◽  
Step Length ◽  
Linear Actuator ◽  
Driving Mechanism ◽  
Driving Voltage ◽  
Loading Capacity ◽  
Driving Frequency ◽  
Element Analysis ◽  
Novel Design

This article presents the piezoelectric ultrasonic linear actuator based on binate feet driving. The actuator is equipped with a rhombus binate feet mechanism to generate two synchronous rectangle driving trajectories. With the help of the two synchronous trajectories, the proposed actuator can deliver stable long-range motion (the designed maximum stroke is 19 mm) accompanying with large loading capacity and high driving resolution. The configuration and operational principle are described in detail and the driving trajectory of the binate feet is analyzed. Finite element analysis is conducted to investigate the static deformation and stress status of the driving mechanism at every step. The experimental system is established to test the performance of the actuator prototype and the results indicate that the prototype can be operated stably step by step and all steps have high reproducibility. The driving resolution (minimum step length) of the actuator prototype is 25.9 nm. The maximum loading capacity and the maximum thrust are 37.2 and 3.2 N, respectively. The experimental results also confirm that the designed actuator can achieve various motion velocities by changing the driving voltage and driving frequency.

Energy Analysis of Piezoelectric-Actuated Structures Driven by Linear Amplifiers

1999 ◽  
Author(s):  
Donald J. Leo
Keyword(s):  
Energy Dissipation ◽  
Piezoelectric Actuator ◽  
Supply Voltage ◽  
Mechanical Load ◽  
Minimum Energy ◽  
Electromechanical System ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Additional Energy ◽  
Energy Dissipated

Abstract Energy expressions for a piezoelectric actuator coupled to a resonant mechanical load are analyzed for the purpose of determining the energy requirements of controlled structures. The analysis illustrates that the energy dissipated within the linear amplifier is a function of four parameters: the driving frequency, the piezoelectric coupling coefficient, the relative stiffness of the actuator and load, and the amplifier supply voltage. The piezoelectric actuator and the mechanical load are assumed to be lossless to highlight the relationship between energy dissipated within the amplifier and the energy stored in the actuator. For a specific frequency, the minimum energy dissipation within the amplifier is equal to twice the stored electrical energy in the piezoelectric when the amplifier voltage is equal to the driving voltage of the actuator. Additional energy is dissipated within the amplifier when the supply voltage is greater than the driving voltage. In the case when the actuator displacement is constant as a function of frequency, the energy dissipation in the amplifier decreases near the resonance of the coupled electromechanical system and reaches a minimum when the piezoelectric charge due to the applied voltage is equal and opposite to the charge induced by the load. The steady-state amplitude of the charge, and hence the actuator current, is equal to zero at this frequency. The results illustrate that energy dissipation is minimized when the actuator is operated at near the resonance or antiresonance of the coupled electromechanical system.

Hysteresis Modeling and Parameter Identification of an Encapsulated Piezoelectric Actuator

2015 ◽  
Author(s):  
Yang Zhang ◽  
Zhaobo Chen ◽  
Yinghou Jiao ◽  
Yuan Wei
Keyword(s):  
Parameter Identification ◽  
Piezoelectric Actuator ◽  
Experimental System ◽  
Response Speed ◽  
Driving Voltage ◽  
Modeling And Control ◽  
Output Displacement ◽  
Identification Method ◽  
Rate Dependent ◽  
Hysteretic Characteristics

The hysteresis of the piezoelectric actuator possesses the rate-dependent characteristics, which significantly affects the precision and response speed of the piezoelectric actuators. That challenges to the traditional modeling and control techniques in micro-/nano-manipulation. The static and dynamic experiments are performed to validate the rates-dependent characteristics of our proposed encapsulated piezoelectric actuator, including the preload-dependent, frequency-dependent and amplitude-dependent characteristics. In order to accurately predict the EPA output hysteresis displacement with respect to the driving voltage, the Bouc-Wen model is proposed. The corresponding parameter identification method is established to identify the parameters of the proposed Bouc-wen model. To evaluate the effectiveness of the proposed model and parameter identification method, the experimental system is implemented. The results indicate that the output displacement predicted by proposed Bouc-Wen mathematics model can match the measured data very well. The maximal absolute, relative and normalization total errors of the proposed Bouc-wen model are 0.548um, 4.26% and 0.0583 respectively, which shows the proposed Bouc-Wen model can well describe the hysteretic characteristics of the piezoelectric actuator.

scholarly journals A Novel Low-Frequency Piezoelectric Motor Modulated by an Electromagnetic Field

Actuators ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 85 ◽  
Author(s):  
Jichun Xing ◽  
Yong Qin
Keyword(s):  
Magnetic Field ◽  
Natural Frequencies ◽  
Low Frequency ◽  
Dynamic Equations ◽  
Driving Frequency ◽  
Piezoelectric Motor ◽  
Driving System ◽  
Driving Mode ◽  
Driving Signal ◽  
The Ideal

For expanding the driving mode of the piezoelectric motor, a novel piezoelectric motor modulated by a magnetic field is proposed. This driving system combines piezoelectric driving and magnetic modulation together and can transform the reciprocating swing of the stator into step running of the rotor via the intermittent magnetic clamping between the rotor and stator. For investigating the inherent character of dynamics, the dynamic equations of key parts of the driving system are established. The natural frequencies and mode functions of the driving system are solved. A prototype was fabricated to prove the dynamic analysis and measure the output characteristic. The results show that the nature of the frequency measured from the test is coincident with theoretical analysis. In addition, by applying the driving frequency of 3 Hz, the voltage of the modulating signal of 4.5 V, the phase difference α between driving signal and modulating signal of 30°, the ideal outputs are 0.1046 rad/min for velocity and 0.405 Nmm for torque.

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