| 摘要 |
PURPOSE:To reduce aging and provide the title motor with stable brake torque performance, by a method wherein both surfaces of a vibrating body and a moving body are provided with friction members so that both surfaces contact through the friction members. CONSTITUTION:An ultrasonic motor is constituted of a piezoelectric body 1, a metallic vibrating body 2 on the surface of the piezoelectric body and a metallic moving body 3. In this case, a friction member 4a, consisting of the principal constituent of plastics, is fixed to the surface of said vibrating body 2 while the friction member 4b, consisting of the principal constituents of plastics, is fixed to the surface of the moving body 3 also. Both of the friction members 4a, 4b are pressed by a clamping force to contact them. According to this method, the traveling wave of ultrasonic oscillation is generated in the vibrating body 2 and the friction member 4a of the side of the vibrating body when the high-frequency electric field is inputted into the piezoelectric body 1 whereby the friction member 4b of the side of the moving body is driven integrally with the moving body 3 by a friction force. When the electric power is not inputted, a brake torque, equivalent to the product of a pressing force, exerted between both friction members 4a, 4b, and a friction coefficient, is generated. |
