Configuration of a Transverse Vibration Rod Type Ultrasonic Motor Using Three Longitudinal Transducers Driven in Three Different Vibration Phases

概要

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The vibration and load characteristics of an ultrasonic motor using a circular vibration disk with three longitudinal transducers have been studied. Three bolt-clamped Langevin type piezoelectric ceramic (PZT) longitudinal transducers (BLT) 20 mm in diameter were installed along the circumference of the circular disk, and complex transverse vibration rods were installed normally in the center of the circular disk. A complex transverse vibration rods are driven simultaneously using three power amplifiers with a phase difference of 120°. The transducers could also be driven using only one power amplifier in the case where the resonance frequencies were slightly different. A rotor disk installed on the free edge of the transverse vibration rod was pressed statically to a driving surface using a system for inducing static pressure. A maximum torque over 0.12 Nm was obtained using three power amplifiers under a static pressure of 1.7 MPa. A maximum rotation of 280 rpm and an efficiency of 1.13% were obtained using one power amplifier under a static pressure of 1.4 MPa.
2004-05-15