Ultrasonic Motor And Its Control System Design And Research

An ultrasonic motor is a kind of driving machine which obtains dynamic in virtue of use friction to transfer elastic ultrasonic vibration. It is a kind of motor with a completely new driving principle to obtain turning force. The motor converts a piezoelectrically excited resonant vibration of the stator into a rotational movement of the rotor by frictional forces. As compared with conventional electromagnetic motor, the ultrasonic motor possesses the following features: compactness in size, high-torque at a low-speed range, fast response, insensitive to magnetic fields, high holding torque when power is off and so on. So it is fit for fully utilized for substitutional purposes, mainly in the areas such as actuators of devices for robots, precise positioning devices, miniaturized machines, aerostat and spacecrafts. Since the ultrasonic motor has the excellences that differ from those of the electromagnetic motors and has the wide application foreground, more and more scientists and scholars are enchanted. And it is becoming a new and advanced theme in the world.This paper studied a piezoelectric ultrasonic motor of rotary type, and an ultrasonic motor with multiple reeds. The following is the basic content.The development of the piezoelectric ultrasonic motor in foreign countries and in China is systematically reviewed. The features and class are summarized. Its scientific purport and application foreground are introduced also.The core of the piezoelectric ultrasonic motor, piezoelectric ceramic is systematically researched. Based on the piezoelectric effect, the piezoelectric equations are derived. Several parameters affecting piezoelectric were discussed. Operating mechanism and intact performance of ultrasonic motor was studied by method of equivalent circuit.Based on relative theory of studying ultrasonic motor, the author designs and develops a ultrasonic motor at the beginning of designing of the stator. The paper discussed the designing theory of ultrasonic motor, In order to design the control system of ultrasonic motor, the paper tested designed ultrasonic motor.The author has studied several factors affecting ultrasonic motor and discussed several control mode of control mode, closed-loop neural network control system was designed and tested.An ultrasonic motor with multiple reeds was studied further, and it was controlled by computer in platform of Labview.