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A bending vibrations hybrid type ultrasonic motor with a bonded-type structure is proposed and designed in this work. Four pieces of PZT plates are bonded on a metal beam to form the proposed motor. In this design, elliptical movements of the driving feet, the significant motion to realize the actuating of a rotor, is produced by the superimposing of two first bending vibrations orthogonal in space...
A novel longitudinal-bending (L-B) hybrid ultrasonic motor using vibration coupling is proposed. Different with the previous L-B ultrasonic motors, only longitudinal PZT plates are used; and the longitudinal-bending hybrid vibrations of the motor are excited synchronously. Fixed boundary condition is applied on one side surface of the flange, which locates at the wave node of a longitudinal transducer...
This paper presents a new idea for constructing ring-type linear ultrasonic motor. The stator of proposed motor contains two driving feet, sixteen pieces of piezoelectric ceramic plates and three rings-inner ring, middle ring and outer ring. The proposed ultrasonic motor forms elliptical movements on the driving feet by the superposition of stretching and bending vibration of the metal rings. This...
A linear ultrasonic motor using longitudinal vibration transducers with single foot was proposed, designed, fabricated and tested in a previous study. The longitudinal vibrations of two orthogonal bolt-clamped transducers are superimposed to produce elliptical movements on the driving foot. Firstly, the operating principle of the proposed motor is discussed. The longitudinal and bending vibrations...
A new linear ultrasonic motor using the 1st longitudinal and the 4th bending vibration modes of a bolt-clamped type transducer has been proposed and studied. The new motor with two feet employed only the bending PZT elements. Two groups of PZT elements are clamped between the two exponential shape horns and the flange bolt. The driving feet are located in the same side of the transducer. The working...
Ultrasonic motors (USM) are new type actuators that exhibit merits such as simple structure, high torque at low speed, compact size, quick response, quiet operation, self-locking when power off, no electromagnetic radiation and higher position accuracy. In the previous study, the authors proposed a new type USM using bending vibration mode. In that new design, elliptical trajectory vibrations are...
A cylindrical standing wave ultrasonic motor using cantilever and sandwich type transducers was proposed in this paper. There are four pairs of cantilevers outside the cylindrical stator, and four PZT ceramics are set between each pair of cantilevers. The PZT ceramics together with a pair of cantilevers compose a longitudinal transducer. The bending mode of cylindrical stator is excited by the longitudinal...
A cylindrical ultrasonic motor using bending transducer was proposed in this paper. The stator components of proposed motor contain a cylinder and four bending transducers, and the four uniform bending transducers are set on the exterior surface of cylinder. The bending of transducers is excited by the longitudinal vibration of PZT ceramics. The four transducers are excited with two different groups...
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