The article presents resarches for designing and manufacturing of the ultrasonic motors that uses piezoceramic materials. There are presented specific vibrations modes for the studied piezoceramic plates, vibrations that are used to excite the motor activated element (mobile element). Using the finite element method it is really posssible to predict the usefull vibrations that can makes easier ...

− This paper presents a set of results regarding the torque of travelling wave ultrasonic motor. It is known the fact that at this type of motor there are a set of phenomena which requires some advanced investigations. The analysis of torque characteristics requires precision measure methods, torquemeters or dinamometers. The torque dependence and influence of specifical parameters are presente...

A piezoelectric ultrasonic resonant micro-motor is developed with a stator diameter of 241 μm and an overall diameter of 400 μm. The motor is shown to produce a start-up torque of 1.2 nN m and a peak output power of 0.25 μW as designed, with a preload of 46.6 μN. An increase in preload to 2264 μN improved the performance to a start-up torque of 29 nN m and a peak output power of 9.1 μW. The mot...

In response to rising demand for high performance actuators to serve nano-technology, a linear ultrasonic motor was designed and constructed to verify its potential as a viable nano-actuator. After establishing the analytical model that elucidates the physics of the ultrasonic motor operation, experimental performance tests were conducted in a fully digital controlled real-time control environm...

This project is concerned with the design of the control system for the accurate positioning of the spherical rotor of an ultrasonic motor equipped with piezoelectric actuators. The motor is intended to be used for trajectory following of flying objects as well as to support human articulations (shoulder, knee) of handicapped. The ultrasonic motor has 3 stators with piezoelectric actuators in a...

1. Introduction Ultrasonic motor (USM) which has many useful features, such as high torque at low speed, precise position, quick response, and no electromagnetic interference, has been widely used in the fields of robotics, medicine and optics

Speed, position and load characteristics of the ultrasonic motor is considerably influenced from the input characteristics such as driving frequency, magnitude and phase difference of phase voltages. Input and output characteristics of a traveling-wave ultrasonic motor have been investigated from the experimental point of view in the present study. For this aim, a half-bridge serialresonance in...