Modified transducer for multimode ultrasonic motor

Abstract

This report provides modified design of an ultrasonic motor stator transducer, whose top can vibrate along the figure-of-eight locus. The design employs two Langevin type ultrasonic transducers. Operating frequency of one transducer is just doubled as that of the other. Therefore this type of ultrasonic motor has been referred as multimode ultrasonic motor in this research. The modified design employs 2nd order vibration mode to keep mechanical Q factor. Fabrication of the new transducer and motor driving characteristics in the three driving modes, which are figure-of-eight driving, impact driving and DC driving, are reported.

A Study on the Linear Piezoelectric Motor of Mode Shape

“…Their maximum thrust or loading are 142N, 103N and 100N respectively. If it focuses on energy efficiency, they are a linear piezoelectric motor driven by a single-phase signal [12], a multimode ultrasonic motor [10] and an ultrasonic linear motor using traveling surface acoustic wave [6]. Their minimum driving voltages are 16 V p−p , 30 V p−p and 80 V p−p respectively.…”