Research Progresses in Piezoelectric Materials for Ultrasonic Motor Applications

The performance of piezoelectric materials affects and restricts the development of ultrasonic motors to a great degree.In this paper the application and research progress of piezoelectric materials for ultrasonic motors are discussed from several aspects.The demand of the performance of piezoelectric materials for ultrasonic motors and the present status of the applications of these materials are reviewed.Some potential improving methods are proposed from the aspects of composition,process and quality.The progresses in research on piezoelectric materials for ultrasonic mo- tors in extreme environment,especially relaxor ferroelectric single crystal and high Curie temperature piezoelectric ma- terial are discussed.Suggestions for future research on piezoelectric materials applied to ultrasonic motors are given.