Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : June 01, 2022 - June 04, 2022
Previously, an underwater ultrasonic motor with suspended rotor has been reported. The rotor (also called opposing block) has tilted surfaces that imitate impeller. On the other hand, rotation of rotor without the tilted surfaces was observed. The rotor has through holes. In this study, effect of hole shape on rotational characteristics was experimentally investigated. As a result, it was confirmed that inverting the rotor induced inverse of rotation direction. It was also confirmed that rotational characteristics varied depending on length and position of holes. To clarity rotation principle, water flow around the rotor was observed. A hypothesis of rotation principle was derived from observed water flow and rotational characteristics of some rotors. Contrarily, rotors with rotational characteristics incompatible with the hypothesis were found in the experiments. Therefore, further investigation of factors that act on the rotational phenomenon will be required.
