Hundreds of piezoelectric ultrasonic motors (PUSMs) have been proposed for scientific
researches and developed for commercial applications in the past decade. They are …

Multimodal biometric systems are often used in a wide variety of applications where high
security is required. Such systems show several merits in terms of universality and …

A traveling wave ultrasonic motor utilizing a radial bending mode of a thick ring is proposed.
Twenty PZT stacks and 20 block springs are nested alternately into 40 slots cut in the ring's …

Current traveling wave ultrasonic motor (TWUSM) utilizes comb-teeth structure as deflection
amplifier. The position of the stator neutral axis to the stator contact surface is one of the …

Piezoelectric transducers are conventionally driven at their resonance frequency, where
they show resistive characteristics. However, the resonance frequency does not take …

To make full use of the vibrational energy of a longitudinal transducer, a rectangle-type
linear ultrasonic motor with four driving feet is proposed in this paper. This new motor …

Existing rotary ultrasonic motors operating in extreme environments cannot meet the
requirements of good environmental adaptability and compact structure at same time, and …

Three-dimensional coupled vibration of the composite cylindrical piezoelectric transducer is
analyzed. The composite cylindrical piezoelectric transducer consists of an inner axially …

In this letter, a millimeter scale thick film rotating traveling wave ultrasonic motor based on
chemical mechanical thinning and polishing process was proposed. The 30 thick …

Ultrasonic motors have the merits of high ratio of torque to volume, high positioning
precision, intrinsic holding torque, etc., compared to the conventional electromagnetic …