Load Characteristics and Vibration Loci at the Driving Surfaces of Ultrasonic Rotary Motor using a Longitudinal-Torsional Vibration Converter

概要

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Characteristics of ultrasonic rotary motors using a longitudinal-torsional vibration converter, 15 to 50 mm in diameter, are studied. To obtain a large torque, ultrasonic motors using one-dimensional longitudinal-torsional converters with diagonal slits are proposed. The converters have simple and tough structures and are driven using only a longitudinal vibration transducer. The vibration converters are fabricated from metal materials and have diagonal slits cut along the converter circumference, adjacent to a nodal position of longitudinal vibration. The ultrasonic motors consist of a vibration converter having a driving part at its free edge, and a rotor part statically pressed to the driving surface using comed disk springs. The vibration characteristics and vibration loci at the driving surfaces of these converters and motors are measured under loaded and nonloaded conditions and at forward and reverse rotating conditions, using two laser Doppler vibrometers. Vibration locus shapes are changed according to the load conditions and frequencies. Maximum torques of over 0.2 N・m are obtained by the converters, 15 to 20 mm in diameter, and at frequencies of 56 to 65 kHz. The maximum revolution speed obtained is over 550 r.p.m. using a 15-mm-diameter motor of 56 kHz.
社団法人応用物理学会の論文
1998-05-30