Abstract
A novel design of a multiple degrees of freedom (multi-DOF) 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 ring-shaped 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 Earth’s 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.
Highlights
Piezoelectric actuators and devices are widely used for various applications
It is possible to find them in photo cameras, laser beam control mechanisms, optical systems, robotics, etc
Requirements for equipment that will be used for space applications are very strict—it includes space, mass and volume, complexity and many other parameters for the assets, which will be used for the missions
Summary
Piezoelectric actuators and devices are widely used for various applications. It is possible to find them in photo cameras, laser beam control mechanisms, optical systems, robotics, etc. One of the possible areas, where the piezoelectric actuator could be used for specific tasks is the space industry. Piezoelectric actuators are small and reliable and can be adapted for specific necessary applications. Requirements for equipment that will be used for space applications are very strict—it includes space, mass and volume, complexity and many other parameters for the assets, which will be used for the missions. Piezoelectric actuators are superior for such kind of applications as high precision positioning systems for the adjustment and control of optical systems, telescopes and other fine instruments [2]
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