The Operation Mechanism Of The Ultrasonic Motor Drive Power

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.The main content studied in this paper is summed up : 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.