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A RADIAL-TORSIONAL VIBRATION HYBRID TYPE ULTRASONIC MOTOR

Guo Ji-feng

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Abstract

A longitudinal-torsional hybrid type ultrasonic motor offers bigger torque and lower revolution speed with respect to other kinds of ultrasonic motors , but it is difficult to adjust longitudinal and torsional phase at a particular frequency . A newly radial-torsional vibration hybrid type ultrasonic motor with hollow structure is put forward , which has one longitudinal piezoelectric ceramic element and one torsional piezoelectric ceramic element. It’s easy to make frequencies of two phases the same and take use of vibration power . The former model is improved and a Φ 60 mm prototype is fabricated . The obtained experimental results verify the basic principle of the motor. The no-load velocity and maximum torque for a typical motor are 40 r/min and 3.2N·m . This kind of motor is smaller and lighter than the former ones.

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What this paper is about

A longitudinal-torsional hybrid type ultrasonic motor offers bigger torque and lower revolution speed with respect to other kinds of ultrasonic motors , but it is difficult to adjust longitudinal and torsional phase at a particular frequency . A newly radial-torsional vibration hybrid type ultrasonic motor with hollow structure is put forward , which has one longitudinal piezoelectric ceramic element and one torsional piezoelectric ceramic element. It’s easy to make frequencies of two phases the same and take use of vibration power . The former model is improved and a Φ 60 mm prototype is fabricated . The obtained experimental results verify the basic principle of the motor. The no-load velocity and maximum torque for a typical motor are 40 r/min and 3.2N·m . This kind of motor is smaller and lighter than the former ones.

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Available abstract

A longitudinal-torsional hybrid type ultrasonic motor offers bigger torque and lower revolution speed with respect to other kinds of ultrasonic motors , but it is difficult to adjust longitudinal and torsional phase at a particular frequency . A newly radial-torsional vibration hybrid type ultrasonic motor with hollow structure is put forward , which has one longitudinal piezoelectric ceramic element and one torsional piezoelectric ceramic element. It’s easy to make frequencies of two phases the same and take use of vibration power . The former model is improved and a Φ 60 mm prototype is fabricated . The obtained experimental results verify the basic principle of the motor. The no-load velocity and maximum torque for a typical motor are 40 r/min and 3.2N·m . This kind of motor is smaller and lighter than the former ones.

Key concepts: Ultrasonic motor, Torsional vibration, Vibration, Torque, Piezoelectricity, Acoustics, Ultrasonic sensor, Piezoelectric motor

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