Study on improving the resolution of an H-shaped piezoelectric ultrasonic actuator by stick-slip principle

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.

Section: Introductionmentioning

confidence: 99%

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

Pang,

She,

Xing

et al. 2024

“…Ultrasonic motors (USMs) utilise the inverse piezoelectric effect of piezoelectric materials to excite the micro-amplitude vibration of metallic elastomers in the ultrasonic frequency band and achieve the transformation of electrical energy to mechanical energy through the frictional interaction between stator and mover [1][2][3][4]. Owing to their advantages of high response speed, compact structure, immunity to electromagnetic interference, and precise positioning [5][6][7][8][9], the USMs are widely used in microrobots, aerospace devices, high accuracy positioning, biomedical technology, and semiconductor processing [10][11][12]. Based on the number of vibration modes, * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Development of a novel single-mode miniature standing wave ultrasonic motor

Pan,

Wang,

Wan

et al. 2023

A novel single-mode miniature standing wave ultrasonic motor (SUSM) is proposed. The SUSM uses the first extension vibration mode and second extension vibration mode of the stator to generate different diagonal vibration trajectories and drive the rotor to rotate in different directions through a single-phase signal. The bidirectional motion of the SUSM can be realised by switching the two vibration modes and excitation methods. The motor is designed and the operating principle is analysed. The resonant frequencies of the two vibration modes are determined by the finite element simulated analysis, and the transient analysis is adopted to obtain the diagonal trajectories of the driving part. Finally, a prototype of the single-mode SUSM is developed and the mechanical performance of the prototype is measured and evaluated. According to the experimental results, the motor has a no-load speed of 265.37 rpm (B1 mode) and 320.20 rpm (B2 mode) in each direction under 200 Vp-p and 100 Vp-p voltage excitation, and the maximum load is 60 mN and 70 mN, respectively.

“…Piezoelectric actuators can be classified in many ways. From the perspective of excitation, piezoelectric actuators can be divided into single-phase excitation, dual-phase excitation and multi-phase excitation [7][8][9][10]. The conventional singlephase excitation type actuators usually utilize the combination of only one vibration mode and some special structures to achieve driving purposes.…”

Section: Introductionmentioning

confidence: 99%

A novel compact bolted-type piezoelectric actuator excited by two excitation methods: design, simulation, and experimental investigation

Liu¹,

Fu²,

Wang³

et al. 2023

A novel bolted-type piezoelectric actuator excited by two excitation methods was proposed and investigated in this paper using both simulations and experiments. Different from most existing piezoelectric actuators, the proposed actuator can be excited by two different excitation methods, namely single-phase excitation method and dual-phase excitation method. The structure of the actuator was depicted and its geometric dimensions were presented. Furthermore, the working principles of the proposed actuator under these methods were illustrated in detail, and the vibration characteristics of the driving foot were analyzed using the finite element method. In addition, a prototype was fabricated and an experimental system was set up to evaluate the output performance of the prototype. The experimental results indicated that the actuator achieved a maximum velocity of 483.7 mm s-1 and a maximum thrust of 3.4 kg with dual-phase excitation, and a maximum velocity of 284.6 mm s-1 and a maximum thrust of 2.2 kg with single-phase excitation.