Traveling Wave Ultrasonic Motor Using a Flexural Composite Transducer

Abstract

This paper presents a new design for a traveling wave ultrasonic motor with a bolt-clamped Langevin transducer. A flexural composite transducer was attached to a ring around its circumference to excite two degenerate flexural vibration modes spatially and temporally orthogonal to each other in the ring for flexural traveling wave excitation. The prototype motor, composed of a 30-mm-diameter composite transducer attached along the outer edge of a 130-mm-diameter ring, was designed and tested. A maximum torque of 1.28 NÁm with a maximum efficiency of 3.8% was achieved when driven at an applied voltage of approximately 200 V rms and a preload of 172 N.

Stator optimization and evaluation method in a surface acoustic wave motor

“…7,8) Through frictional force, the driven slider can achieve linear motion. [9][10][11][12][13] The SAW motor, as a type of traveling-wave ultrasonic motor, [14][15][16][17] has been studied for twenty years. Merits of the SAW motor are the small size, high speed, high power, and high precision.…”