Ultrasonic motors: theory and applications
This book provides a completely up-to-date survey of the many different types of ultrasonic motors currently in use. These motors, which use ultrasonic vibrations to produce a frictional driving force, have many attractive features, including simple structures which can easily be miniaturized, large power to weight ratios, high torque at low speed, high precision due to low inertia and easy electronic control, and no associated magnetic field. With such advantages, they are increasingly displacing conventional electromagnetic motors in robot actuators, camera autofocus mechanisms, and aerospace devices, to name a few examples. Written by leading experts on the subject, the book introduces the reader to the design and manufacture of the motor as well as to techniques for evaluating motor performance. It will be an invaluable guide to electrical engineering researchers, designers, and manufacturers.
GENERAL OUTLINE OF ULTRASONIC MOTORS
PRINCIPLES OF OPERATION AND CLASSIFICATION
DISK OR RINGTYPE
10 other sections not shown
Acoustical Society annular plate bending bolt contact duration contact surface degenerate modes diameter dimensions direction disk vibrator double-mode driving frequency driving voltage duralumin electrodes elliptical displacement motion elliptical motion equivalent circuit example excitation flexural vibrator frictional material hybrid transducer-type ultrasonic impedance Japan linear motor longitudinal mode longitudinal vibration maximum torque measured mechanical load method mode rotation motor characteristics motor construction motor in Fig motor is shown multilayered piezoelectric actuators nodal nodal lines obtained output phase difference piezo piezoelectric ceramic piezoelectric vibrator plate motor power input pre-load progressive wave prototype motor PZT elements ratio resonance frequency resonance modes ring roller rotary encoder rotor shown in Fig Society of Japan speed of rotation stator vibrator Takano thickness thrust Tohoku University Tomikawa torque TORQUE mN torsional vibrator transducer transmission bar two-phase drive type of motor Ueha ultrasonic motor vibration amplitude vibration mode vibration velocity voltage voltage applied