High Power Travelling-Wave Type Ultrasonic Motor

Abstract

We have performed an experiment aimed at developing a high power ultrasonic motor based on a thin, lightweight, travelling-wave type design. This paper presents a detailed analysis of experimental results. Three prototype motors of the improved type were fabricated, having outer diameters of 50, 70 and 90 mm. Compared to a motor employing a piezoelectric element of the same outer diameter and the same resistive resin material as conventional types of motors, approximately twice as high maximum torque and four times as high maximum output power have been obtained with the prototype motors. It has also been confirmed that these motors have sufficient durability to withstand high-loads.

Survey of a contact model and characteristic analysis method for a travelling wave ultrasonic motor

“…The smallest error among the iterated K values at each iteration step of L, where the error is the difference between the applied normal force and the normal force calculated by Eq. (29). In this case the applied normal force FN is 27(N).…”

Design and Experiment of a Large-Aperture Hollow Traveling Wave Ultrasonic Motor with Low Speed and High Torque

“…In addition, we compared the 70HB with the same size motor in Ref. [11]. It can be seen that as the driving frequency decreases, the output speed and torque of both motors increase and peak near the resonance point.…”

“…Glenn et al developed a ∅ 80 mm two-sided piezoelectric rotary ultrasonic motor with a maximum speed and stall torque of 40 rpm and 1.7 N•m, respectively [10]. Kawai et al developed a ∅ 70 mm double-piezoelectric-ceramic motor with a maximum speed and stall torque of 200 rpm and 2.1 N•m, respectively [11]. Li et al developed a ∅60 mm double-piezoelectric-actuator motor with a maximum stall torque reaching 1.2 N•m [12].…”

Potential ability of ultrasonic motors: A discussion focused on the friction control mechanism

“…The absolute values in this case are lower, since the fatigue limit of vibrators with bonded piezoelectric elements is lower than for those with boltclamped ones. A high output traveling motor has been reported with a bonded stator [35]. In another paper, a large torque of 3 Nm was achieved with a motor 30 mm in diameter by developing a bolt-clamped vibrator for a traveling wave motor [36].…”