The Contact Problem in Ultrasonic Traveling-Wave Motors

Sattel, Thomas; Hagedorn, Peter; Schmidt, Joachim P.

doi:10.1115/1.4000380

Cited by 24 publications

(15 citation statements)

References 11 publications

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“…Indeed, modeling of contact mechanics and control of piezoelectric motors to clarify the nature of the operating principal and to optimize performance has always been an important study area in the field of piezoelectric motors [78][79][80][81][82][83][84][85][86][87].…”

Section: Discussionmentioning

confidence: 99%

Piezoelectric Motors, an Overview

2016

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Piezoelectric motors are used in many industrial and commercial applications. Various piezoelectric motors are available in the market. All of the piezoelectric motors use the inverse piezoelectric effect, where microscopically small oscillatory motions are converted into continuous or stepping rotary or linear motions. Methods of obtaining long moving distance have various drive and functional principles that make these motors categorized into three groups: resonance-drive (piezoelectric ultrasonic motors), inertia-drive, and piezo-walk-drive. In this review, a comprehensive summary of piezoelectric motors, with their classification from initial idea to recent progress, is presented. This review also includes some of the industrial and commercial applications of piezoelectric motors that are presently available in the market as actuators.

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Section: Discussionmentioning

confidence: 99%

Piezoelectric Motors, an Overview

2016

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“…Because the friction forces depend mainly on factors such as the coefficient of static/dynamic friction, and considering the forces and stresses at the interface between the stator and the rotor, the normal contact pressure and the relative motion of interfaces, two different types of “friction” should be distinguished [8,13]. …”

Section: Kinematics Modelling Of the Piezoelectric Dynamic Balance Rementioning

confidence: 99%

“…The energy conversion efficiency of the second stage is discussed in detail in this paper. Because the intermittent contact between the stator and the rotor is cyclical, it is possible to choose a contact cycle to analyse the energy conversion characteristics [13]. The power transferred to the rotor is:

P_{out} = \int_{T}^{t + T} M_{L} ω_{R} dt

…”

Section: Kinematics Modelling Of the Piezoelectric Dynamic Balance Rementioning

confidence: 99%

Modelling and Analysis of a New Piezoelectric Dynamic Balance Regulator

Mei

2012

Sensors

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In this paper, a new piezoelectric dynamic balance regulator, which can be used in motorised spindle systems, is presented. The dynamic balancing adjustment mechanism is driven by an in-plane bending vibration from an annular piezoelectric stator excited by a high-frequency sinusoidal input voltage. This device has different construction, characteristics and operating principles than a conventional balance regulator. In this work, a dynamic model of the regulator is first developed using a detailed analytical method. Thereafter, MATLAB is employed to numerically simulate the relations between the dominant parameters and the characteristics of the regulator based on thedynamic model. Finally, experimental measurements are used to certify the validity of the dynamic model. Consequently, the mathematical model presented and analysed in this paper can be used as a tool for optimising the design of a piezoelectric dynamic balance regulator during steady state operation.

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“…The wear of FM result in the variations of preload, the coefficients of KelvinVoigt model (equivalent stiffness k n and k t , equivalent damping c n and c t ) and the topography of friction surfaces. Sattel et al 12 proposed a planar contact model for the stator-rotor interaction and the results show that preload has influence on the resonance frequency of the operational eigenmode. Endo et al 13 researched the propulsion force and velocity of ultrasonic motor under different preload.…”

Section: Introductionmentioning

confidence: 98%

Mechanical and electrical characteristics of traveling wave ultrasonic motors during the whole life of friction material

Zhang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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It is difficult to evaluate the characteristics of traveling wave ultrasonic motors (TWUSMs) during the whole life of friction material (FM) because the wear of FM is quite slow. To solve this problem, an accelerated life test method was proposed and the mechanical and electrical characteristics of TWUSMs in the whole life of FM were analyzed systematically. The results show that the mechanical characteristics including speed and efficiency have a decline trend after an ascent with the increase of FM thickness, especially when the load torque is great. When the load torque is greater than 0.4 Nm, the optimum range of FM thickness is 0.10-0.20 mm. When the residual FM thickness is less than 0.17 mm, holding torque is greater than stall torque. Electrical characteristics of TWUSM show monotonicity in the whole life of FM. Therefore, the variations of electrical characteristics could be the wear indicator of FM. Based on experiment analysis, mechanism of interactions and couplings in the energy transfer process of the TWUSM system was explored. The energy transfer process of TWUSM was divided into four subprocesses. The wear of FM is in the intermediate subprocess, which has influence on both output performance and drive circuit of TWUSM. The four subprocesses interact and couple with each other closely. Consequently, the mechanical part and electrical part of TWUSM should be not isolated, and not only the forward action, but also the backward action in energy transfer process should be considered for a more realistic theoretical model of TWUSM.

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The Contact Problem in Ultrasonic Traveling-Wave Motors

Cited by 24 publications

References 11 publications

Piezoelectric Motors, an Overview

Piezoelectric Motors, an Overview

Modelling and Analysis of a New Piezoelectric Dynamic Balance Regulator

Mechanical and electrical characteristics of traveling wave ultrasonic motors during the whole life of friction material

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