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.

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.

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 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 OF MICRO-INJECTOR WITH INNER BLOCK FOR DROP ON DEMAND APPLICATIONS

2010 ◽  
Vol 24 (13) ◽  
pp. 1373-1376
Author(s):  
MUH-RONG WANG ◽  
TZONG-SHYNG LEU ◽  
YI-JUN SHEN ◽  
WEI-LUNG WENG
Keyword(s):  
Piezoelectric Actuator ◽  
Driving Voltage ◽  
Driving Frequency ◽  
On Demand ◽  
Micro Nozzle ◽  
Drop On Demand ◽  
Flow Through ◽  
The One ◽  
Instability Energy ◽  
Better Than

This paper investigates the characteristics of a piezoelectric micro-injector for drop-on-demand (DOD) applications. The micro-injector is designed with an inner block inside the chamber to enhance the instability energy for the production of mono-size droplet. The micro-nozzle was fabricated by MEMS processes. The upper chip is a silicon chip with two holes as the inlet and outlet of the liquid matter. A diaphragm is mounted on the center of the upper chip. The lower chip has an orifice of 50µm in diameter. The flow through the chamber is used to promote the refilling mechanism for droplet generation. A piezoelectric actuator operated in push mode (D33) was mounted on the upper chip to drive the liquid through the nozzle. An inner block is designed on the inner side of the upper chip. Results show that the micro-injector with inner block could generate mono-size droplet under the driving voltage ranging from 62.5 to 150 volt at frequency of 3.2 kHz. The droplets size was 60µm with velocity ranging from 3.3 to 4.7 m/s which is higher than the case without inner block. As a comparison, the injection of the micro-injector without inner block needs a much higher driving voltage of 112.5 volt at driving frequency of 9.7kHz. It is concluded that the micro-injector with the inner block performs better than the one without the inner block.

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