Design, simulation, and motion characteristics of a novel impact piezoelectric actuator using double stators

The conventional asymmetric inertial impact motors are driven by using the difference in inertial impact forces in the forward and reverse directions, implemented by using asymmetric drive signals, clamping blocks of different sizes or different materials, etc. An adjustable magnetic force type resonant inertia impact motor has been designed, assembled, and tested. The novel motor features a simple and compact structure, allowing for the attainment of different output performance by adjusting the magnetic force to meet various working requirements, and the reverse motion can be easily achieved by simply altering the orientation of the magnet located at the end of the piezoelectric vibrator, without requiring any additional structure The part of the motor’s structure was simulated and optimized using the finite element analysis software COMSOL6.0, with the first and second order vibration modes selected as the working mode. The experimental platform has been established to verify the working performance of the motor. Experimental results demonstrate that, under excitation voltage of 120 VP-P and frequency of 163 Hz, the maximum speed achieved by the motor prototype is 36.55 mm/s, with maximum load capacity of 320 g, and under excitation voltage of 40 VP-P and frequency of 928 Hz, the minimum step of the prototype reaching up to 134 nm. The motor proposed in this paper features an innovative asymmetric strong magnetic design, enabling high speed and load through the large amplitude of the piezoelectric vibrator in first-order vibration mode. As the amplitude gradually decreases in second and higher order modes, this motor achieves higher displacement resolution, making it has potential applications in high precision positioning and medical fields.

Section: Introductionmentioning

confidence: 99%

An adjustable magnetic type resonant multimodal inertial impact motor

He,

Qian,

et al. 2024

“…Piezoelectric driving technology is to utilize the inverse piezoelectric effect of piezoelectric ceramic material, by controlling its mechanical deformation so as to produce rotary or linear drive. This technology is characterized by simple structure [1], excellent driving performance [2], etc. It is commonly used in piezoelectric actuators, piezoelectric drive micro fixtures * Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

An umbrella-shaped flexible mechanism piezoelectric actuator with driving foot trajectory control

Pang,

She,

Xing

et al. 2024

Traditional stick-slip piezoelectric actuators generally have problems such as large backward motion and small load capacity, which affect the driving effect. In this study, the effect of no backward motion and large load capacity is realized by controlling two sawtooth wave-driven piezoelectric stacks on the basis of umbrella-shaped flexible mechanism. The trajectory of the driving foot is simulated by transient simulation and verified by experiment. A prototype of actuator is made, and the effects of voltage, symmetry of sawtooth wave, and the phase difference of the two waves on the driving effect are investigated through experiments, and the optimal driving waveform is found. Experiments have shown that no displacement regression and stable driving is achieved when driving with two sets of sawtooth waves with 100V, 100% symmetry and 20V, 70% symmetry. With this drive waveform at 1Hz, the maximum horizontal and vertical loads are 150g and 1400g, respectively. And the maximum driving speed is 13935μm/s when the driving frequency is 7000Hz. Experimentally, it is proved that the actuator is able to realize smooth driving and large load capacity without backward motion, and has the same forward and reverse working performance, which has greater research value and market application scenarios.

“…Piezoelectric motors have a variety of structures, but the mainstream of the academic circle divides them into inchworm piezoelectric motors [10][11][12], ultrasonic piezoelectric motors [13,14], and inertial impact piezoelectric motors [15][16][17][18][19]. The inertia impact piezoelectric motor uses the inertia impact of the stator vibration to generate micro displacement to realize the linear motion or rotation of the mover [20,21].…”

Section: Introductionmentioning

confidence: 99%

Research on variable stiffness asymmetrical resonant linear piezoelectric actuator based on multi-modal drive

He,

Yue,

Dou

et al. 2023

In this paper, a linear piezoelectric motor with variable stiffness and asymmetric resonance is proposed, which is driven by a single harmonic signal. Working in the resonant state improve the output performance of the motor. Motor control is relatively simple and can realize reverse movement under the driving of second-order single harmonic signal. At the same time, the new motor can obtain different operating speed and step distance by changing the clamping position in front and back to meet the requirements of different loads and different working conditions and has strong applicability. By experiment, the first-order optimal operating frequency of the motor prototype at three different stiffness adjustment positions is 88 Hz, 90 Hz and 92 Hz respectively. Under the excitation of 240 Vp–p first-order resonance signal, the corresponding output speed of the motor prototype is 16.116 mm s−1, 20.457 mm s−1 and 25.015 mm s−1 respectively, and the corresponding displacement resolution is 0.18 mm, 0.22 mm and 0.27 mm respectively. When the stiffness adjustment positions is 2 mm, the maximum load of the motor prototype reaches 450 g. The second-order optimal operating frequency at the stiffness adjustment positions 1 mm is 601 Hz. Under the excitation of a 240 Vp–p second-order resonant signal, the reverse output speed of the motor prototype is 13.126 mm s−1, and the corresponding displacement resolution is 0.02 mm.