Ultrasonic Motors Theory And Applications Pdf

ultrasonic motors theory and applications pdf

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In the last decades piezoelectrically driven ultrasonic motors have become alternative actuators to the conventional electromagnetic motors especially for precise and accurate servo positioning applications. Different types of ultrasonic motors have been constructed and manufactured. Several drive systems have been designed, implemented and proposed for these motors.

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Ultrasonic motors: Their models, drives, controls and applications

Abstract Ultrasonic motors have the merits of high ratio of torque to volume, high positioning precision, intrinsic holding torque, etc. There have been several potential applications for this type of motor in aerospace exploration, but bearings and bonding mechanism of the piezoelectric ring in the motors limit the performance of them in the space operation conditions. It is known that the Langevin type transducer has excellent energy efficiency and reliability. Hence using the Langevin type transducer in ultrasonic motors may improve the reliability of piezoelectric motors for space applications. In this study, a novel in-plane mode rotary ultrasonic motor is designed, fabricated, and characterized. The proposed motor operates in in-plane vibration mode which is excited by four Langevin-type bending vibrators separately placed around a ring-shaped stator.

Ultrasonic Motors

An ultrasonic motor is a type of electric motor powered by the ultrasonic vibration of a component, the stator , placed against another component, the rotor or slider depending on the scheme of operation rotation or linear translation. Ultrasonic motors differ from piezoelectric actuators in several ways, though both typically use some form of piezoelectric material, most often lead zirconate titanate and occasionally lithium niobate or other single-crystal materials. The most obvious difference is the use of resonance to amplify the vibration of the stator in contact with the rotor in ultrasonic motors. Ultrasonic motors also offer arbitrarily large rotation or sliding distances, while piezoelectric actuators are limited by the static strain that may be induced in the piezoelectric element. One common application of ultrasonic motors is in camera lenses where they are used to move lens elements as part of the auto-focus system.

The ultrasonic sensor or transducer works on the same principles as a radar system. An ultrasonic sensor can convert electrical energy into acoustic waves and vice versa. The acoustic wave signal is an ultrasonic wave traveling at a frequency above 18kHz. Typically, a microcontroller is used for communication with an ultrasonic sensor. To begin measuring the distance, the microcontroller sends a trigger signal to the ultrasonic sensor.

Ultrasonic motors were invented in by V. V Lavrinko. In general we are aware of the fact that the motive force is given by the electromagnetic field in the conventional motors. But, here to provide a motive force, these motors utilize the piezoelectric effect in the ultrasonic frequency range, which is from 20 kHz to 10 MHz and is not audible to normal human beings. Hence, it is termed as piezoelectric USM technology. Ultrasonic technology is used by the USMs which utilize the ultrasonic vibration power from a component for their operation. Before discussing in detail about this technology we need to know about the information regarding the ultrasonic sensors , piezoelectric sensors and piezoelectric actuators.


The stator of an ultrasonic motor that is excited by piezoelectric [1] S. Ueha and Y. Tomikawa, Ultrasonic Motors: Theory and Applications.


Ultrasonic motor

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Ultrasonic motors Abstract: An ultrasonic motor is proposed which uses two piezoelectric elements in the stator.

Ultrasonic Motors

The working principle, applications and limitations of ultrasonic sensors

Ultrasonic actuators, their working principles, basic structures, and typical characteristics are described in this article, in which we focus on ultrasonic motors based on friction driving and piezoelectric transducers. The expected performance of each hybrid-vibration type method is discussed using an electrical equivalent circuit model. This article also illustrates several practical configurations for both rotary and linear motions as well as a recent attempt to improve the efficiency and lifetime. Already have an account? Login in here. Journal home Journal issue About the journal. Proposed by US.

As the expanding applications of linear ultrasonic motor, the demand for high-thrust linear ultrasonic motor in the aerospace and industrial robots is growing. The results show that the inherent frequency of vibration for the motor stator increases with the order, and corresponds with the vibration mode, by which was realized to work for the linear ultrasonic motor. Request Permissions. Micromotors, , 43 9 :

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References

Either your web browser doesn't support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. Free to read. Traveling wave ultrasonic micromotors fabricated from a single layer of homogeneous bulk piezoelectric lead zirconate titanate PZT are described. The miniature motors are capable of bi-directional rotary motion with controllable speeds. By taking advantage of transverse interdigitated electrodes to excite traveling waves in a patterned bulk PZT substrate, the monolithic micromotor stators are patterned using a simple and low cost fabrication technique based on micropowder blasting. Performance of the ultrasonic micromotors is explored using devices with integrated glass rotors, using defined preload forces applied between the microfabricated stator and rotor elements.

Design and Simulation of a Piezoelectric Ultrasonic Micro Motor

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