3DOF Ultrasonic Motor With Two Piezoelectric Rings A novel design of a multiple degrees of freedom (multiDOF) piezoelectric ultrasonic motor (USM) is presented in the paper. The main idea of the motor design is to combine the magnetic sphere type rotor and two oppositely placed ringshaped piezoelectric actuators into one mechanism. Such a structure increases impact force and allows rotation of the sphere with higher torque. The main purpose of USM development was to design a motor for attitude control systems used in small satellites. A permanent magnetic sphere with a magnetic dipole is used for orientation and positioning when the sphere is rotated to the desired position and the magnetic field synchronizes with the Earthxe2x80x99s magnetic dipole. Also, the proposed motor can be installed and used for robotic systems, laser beam manipulation, etc. The system has a minimal number of components, small weight, and high reliability. Numerical simulation and experimental studies were used to verify the operating principles of the USM. Numerical simulation of a piezoelectric actuator was used to perform modal frequency and harmonic response analysis. Experimental studies were performed to measure both mechanical and electrical characteristics of the piezoelectric motor.

Development of Micro Ultrasonic Actuator and Micro Rotor Blade for Micro Aerial Vehicle Unmanned Aerial vehicles (UAVs) are now a regular feature of modern society which are highly needed for the rescue mission and collecting information at unreachable places. But while the current generation of UAVs are undoubtedly useful, people around the world are increasingly talking of the need for smaller, more agile systems that can be easily transported and operated in narrow places. This leads to the development of Micro Aerial Vehicles (MAVs). However, miniaturizing MAVs is very challenging because various problems still remain unsolved. Among those, miniaturizing actuator and rotor blade are the most common. Hence, in this paper, we describe the development and trial production of micro ultrasonic actuator and micro rotor blade for the development of the smallest MAV in the world.