| 摘要 |
PURPOSE:To make the efficiency and torque of a wave motor higher by employing a ring member material having the product of density and sound velocity not less than 18.71kg/m<2>.sec. and not more than 34.75kg/m<2>.sec. in an ultrasonic motor using a longitudinal and torsional coupling oscillator as stator thereby matching the resonance frequencies of longitudinal and torsional oscillations to each other. CONSTITUTION:Intermediate cylinders 16a and 16b being ring members with a support 17 between are arranged between longitudinal oscillation driving and torsional oscillation driving piezoelectric elements 10 and 11. These members are held between a head mass 12a and rear mass 13 and firmly fastened by a nut 14. A rotor 18 is pressure-welded to the stator of said constitution by a spring in the manner of rotating around a shaft. In this case, the ring members are made of a material having the product of density and sound velocity between 18.7kg/m<2>.sec. and 34.75kg/m<2>.sec. |
