| 摘要 |
PURPOSE:To stabilize characteristic with a strong force, by using a doubly peaked resonance system for a stator generating ultrasonic wave elliptic- oscillation. CONSTITUTION:An ultrasonic wave motor using a doubly peaked resonance system is composed of a torsional coupling element 11, an aluminum disc 12, piezoelectric elements 13, 13', a washer 16, a rotor 17, a bearing 18, a coil spring 19, a shaft 21, terminal plates 22, 22', and the like. Then, through the resonance having doubly peaked characteristic obtained by slight difference from a condition for the resonance characteristic of a resonance system generat ing elliptic oscillation to show singly peaked characteristic with fundamental frequency (a condition to show singly-peaked characteristic of the three oscilla tion modes of rise/deflection/torsion on the torsional coupling element type ultrasonic wave motor), the only one factor is changed, and a resonance peak is divided into two, and by correction with the length of a fastening bolt, a stator having the doubly peaked resonance characteristic of both the peaks with the balanced scale is used. Then, a uniform, wide, and movable frequency zone with rotational frequency showing a constant value is obtained. |
