超音波振動子と対向子を用いた水中回転機構

―第2報 貫通孔を備えた対向子の回転特性―

抄録

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.