A novel ring type ultrasonic motor with multiple wavenumbers: design, fabrication and characterization

Abstract

A novel ring type traveling wave ultrasonic motor (USM) with multiple wavenumbers has been designed, fabricated and characterized. This multiple wavenumber operation is realized by means of a new electrode configuration of the piezoelectric element. The experimental and numerical performance results for the multiple wavenumbers show that USM with multiple wavenumbers significantly outperform the single wavenumber motor as regards the range of speed and torque output. This novel implementation of the traveling wave motor also offers extra control for stable operation of USM. The performances of the control variables, the wavenumber and the amplitude, are compared to show their advantages and disadvantages. The speed control range for the wavenumber is larger than that for amplitude control; wavenumber control has better stability at low speed while amplitude control can work continuously with less wear. Hybrid control using both methods may result in better performance of USM.

Excitation and distortion of elastic vibration of cylindrical ultrasonic stator

“…For simplicity, this work assumes that the stator has a smooth ring shape instead of a straight line. Since ring models are widely used in the existing literature (Duan et al., 2009; Wang and Sinha, 2013; Huang and Soedel, 1987; Zhao and Wang, 2015; Xie et al., 2015), this section only briefly presents the main derivation. Given the complexities of the electromechanical coupling and geometric topology, the scope is limited to the in-plane deflection under bending moment from the piezoelectric patch on a smooth thin-cylindrical stator.…”

“…The existing driving rule was proposed based on the classical vibration theory (Tomikawa et al., 1987; Sashid and Kenjo, 1993; Uchion, 1998; Zhao, 2010; Zhou et al., 2009; Duan et al., 2009). According to this rule, traveling or standing wave is aroused by the orthogonal flexural or extensional vibration modes of a ring- or disk-shaped vibrator.…”

“…(2009) dealt with this issue by employing close-shaped vibrators. Apart from the topology, most of the studies employed π/2 time-spatial phases to excite traveling wave but some used other phases (Tomikawa et al., 1987; Zhou et al., 2009; Duan et al., 2009). A general driving rule which incorporates more feasible phases needs to be proposed based on the close-shaped vibrators.…”

Tribological properties of textured stator and PTFE-based material in travelling wave ultrasonic motors

“…The ultrasonic motor (USM) is a type of piezoelectric actuator that drives a rotor by the frictional force at the interface between the rotor and stator [1][2][3]. When compared with an electromagnetic motor, the USM has the advantages of compact structure, low speed, high torque, quick response, and high-power density.…”

Design and analysis of a disc-type of traveling wave ultrasonic motor with fixing inner side

“…At present, it was widely used to investigate dynamic contact behavior between stator and rotor, the effect of adhesive and stator teeth on stator vibration, the effect of PZT thickness and traveling wave number on motor driving characteristics, etc. [3][4][5].…”