Modeling, analysis and suppression of current harmonics of Langevin-type ultrasonic motors under high voltage

Li, Xiaoniu; Yao, Zhiyuan; Mi, Yi; Lin, Xiaogang; Liang, Chenguang; Wu, Dawei

doi:10.1016/j.precisioneng.2020.04.009

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…The structure schematic of the LUM is illustrated in figure 2, comprising a stator, flexure clamp, preloading springs, and a slider [30,31]. As the LUM operates based on friction, it involves the vibration of the stator and the contact-separation between the stator and the slider.…”

Section: Structural and Mechanical Drift Mechanism Assumptions Of Lummentioning

confidence: 99%

Dynamic modeling and optimization of mechanical drift for compliant parallel micromanipulation driven by V-shape linear ultrasonic motors

Li,

Yao,

et al. 2024

Smart Mater. Struct.

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Designing micro-mechanisms that satisfy large strokes, high precision, and multiple degrees of freedom has consistently been a research focus and challenge in the field of micromanipulation systems. Linear ultrasonic motors (LUMs), with advantages such as millimeter-level travel, nanometer level motion resolution, and power- -off self-locking, significantly contribute to the advancement in the mechanism design of micromanipulation systems. However, the challenge of mechanical drift lacks a comprehensive theoretical analysis to explain its cause and limits its application. This paper presents a mechanical drift modeling method for a compliant parallel micromanipulation (CPM) driven by a linear ultrasonic motor (LUM). The model primarily focuses on the creep characteristics of the flexure clamp element in the LUM. Based on the stiffness matrix analysis method of the compliant parallel mechanism kinematics, the mechanical drift dynamics model of the CPM is established. The influence of the main structural parameters on the CPM mechanical drift is investigated. The research indicates that the creep of flexure clamps in the CPM is the main factor leading to the mechanical drift. Optimization of mechanical drift is achieved by choosing flexure clamps with higher tangential stiffness for LUM and flexure hinge joints with greater flexibility for CPM. Finally, experimental studies reveal that under equivalent conditions, the mechanical drift of the optimized CPM was significantly reduced than before, proving the rationality of the theoretical model and optimization method.

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Section: Structural and Mechanical Drift Mechanism Assumptions Of Lummentioning

confidence: 99%

Dynamic modeling and optimization of mechanical drift for compliant parallel micromanipulation driven by V-shape linear ultrasonic motors

Li,

Yao,

et al. 2024

Smart Mater. Struct.

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“…17 X. Li et al reported that the driving current of an ultrasonic motor with high excitation voltage was prone to harmonic distortion. 18 The nonlinear behavior of piezoelectric ceramics was well described by M. Maeda by adding nonlinear capacitance terms to the fundamental piezoelectric equations. 19 W. Zhang et al investigated the vibration characteristics of piezoelectric laminated composite plates under different environments and conditions, and made in-depth modeling of their nonlinear dynamics, which is of important guiding significance for understanding nonlinear vibration.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the nonlinear phenomena of a Langevin ultrasonic transducer caused by high applied voltage

Zhang

Yang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the field of power ultrasound, Langevin ultrasonic transducers (LUTs) usually operate at a large displacements output power by applying high voltages. However, empirically, a LUT exhibits nonlinearities such as amplitude jumping and peak hysteresis for high voltages in actual operations. The nonlinearities would reduce the efficiency and output accuracy of an LUT. In this research, the burst-mode method was used to measure the longitudinal vibration velocity of the LUT, which gradually decreased with time after the excitation voltage was turned off. The equivalent mechanical losses and equivalent spring constants were determined using the velocity attenuation rate and resonant frequency and they were found to be the linear functions of velocity, helping to develop a novel nonlinear model. This model contained two quadratic nonlinear terms based on the linear model. Furthermore, the developed nonlinear model was analyzed using the Lagrangian method as well as the multiscale method, which confirmed that the model was effective in describing the nonlinear behavior. It was also found that the frequency-amplitude curve bent when the nonlinear term was taken into account, which resembled the nonlinear phenomenon tested experimentally. From a physical point of view, this bending was meaningful because it led to the formation of multi-valued response regions with jumping phenomena. Additionally, according to the obtained results, the maximum value of the system response was independent of the degree of nonlinearity of the system.

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“…It is known that vibration modes have fundamental effect on thrust force density and power density [16,17]. To date, linear motors mainly operate in bending/bending (B 2 ), longitudinal/longitudinal (L 2 ), and bending/longitudinal (B/L) modes [6][7][8][9][10][11][12][13][18][19][20][21]. First, B 2 modes have been heavily exploited in conventional USMs.…”

Section: Introductionmentioning

confidence: 99%

A Traveling-Wave Linear Ultrasonic Motor Driven by Two Torsional Vibrations: Design, Fabrication, and Performance Evaluation

Niu

Cao

et al. 2020

IEEE Access

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In this study, we design and fabricate a tank-track-shaped stator working in two torsional modes to form a traveling-wave (TW) linear ultrasonic motor (USM). The stator comprises two torsional transducers and two kidney-shaped vibrating bodies. When voltages with a certain phase are applied to the transducers, two in-phase TWs are excited on the vibrating bodies to frictionally drive the slider. Here, the torsional vibration guarantees strong electromechanical coupling, and meanwhile, the tank-track shape ensures plural driving points and low weight; these features may facilitate realizing high thrust force density and high power density of linear motors. To examine the feasibility, first, we constructed a stator prototype 116 mm in length, 91 mm in width, and 32 mm in thickness and explored its vibration properties. The minimal standing wave (SW) ratio reaches 1.21 and the small SW components are desirable for TW motors. Then, we measured the load characteristics and found that, at the working frequency of 54.34 kHz and the phase shift of −110°, the maximal thrust force and maximal output power were 96.1 N and 27.8 W, respectively. Moreover, the thrust force density and power density reached respectively 234.1 N/kg and 67.8 W/kg, relatively high compared to the values of most conventional linear motors. This study verifies the feasibility of our proposal and paves a new way of designing powerful linear USMs. INDEX TERMS Linear ultrasonic motor, torsional vibration, traveling wave, thrust force density, power density.

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Modeling, analysis and suppression of current harmonics of Langevin-type ultrasonic motors under high voltage

Cited by 8 publications

References 34 publications

Dynamic modeling and optimization of mechanical drift for compliant parallel micromanipulation driven by V-shape linear ultrasonic motors

Dynamic modeling and optimization of mechanical drift for compliant parallel micromanipulation driven by V-shape linear ultrasonic motors

Investigation of the nonlinear phenomena of a Langevin ultrasonic transducer caused by high applied voltage

A Traveling-Wave Linear Ultrasonic Motor Driven by Two Torsional Vibrations: Design, Fabrication, and Performance Evaluation

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