The Theoretic Analysis, Design And Facture Of Rotary Piezoelectric Ultrasonic Motor

An ultrasonic motor 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 household electrical appliances, 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, the ultrasonic motor had been paid more and more attentions and has been studied as a main issue by the scientists in many countries.The research object of the thesis is two types rotary piezoelectric ultrasonic motor that had been widely used in actual application of ultrasonic motors. The thesis emphasize particularly on the facture of two types rotary piezoelectric ultrasonic motor and the performance experiment. The thesis mainly studies the research on the ultrasonic motor, the research on the piezoelectric ceramic, the movement mechanisms of the ultrasonic motor, the design methods of two types ultrasonic motor, the structure design and the experiment of the ultrasonic motor.The development of the piezoelectric ultrasonic motor in foreign countries and in China is systematically reviewed. The features and class and applications of piezoelectric ultrasonic motor are summarized.The core of the piezoelectric ultrasonic motor, piezoelectric ceramic is systematically researched. Based on the piezoelectric effect, the piezoelectric equations are derived. From the piezoelectric equations, the important parameter of the piezoelectric ceramic's physical performance and the system equations of the vibrator are derived.The movement mechanisms of the ultrasonic motor are deeply investigated. The movement inbeing of the ultrasonic motors, two type form method of elliptical movement are deeply investigated.Based on the theory above, two type prototype rotary piezoelectric ultrasonic motor are developed. Based on two motors, the experiment had been done and get some useful data and conclusion that be helpful to the research later.