| 摘要 |
PURPOSE:To stabilize the operation of an ultrasonic motor while increasing the speed and thrust thereof by driving the motor through an ultrasonic elliptical oscillation where a vector in the direction for approaching a driven body and a speed vector having a component only in the drive direction of the driven body make an acute angle. CONSTITUTION:A body driven by a driver 15 is driven through an ultrasonic elliptical oscillation where a vector in the longitudinal direction of an ultrasonic elliptical oscillation excited in the vicinity of the driver 15 for a resilient body 11 and directed in the direction approaching the driven body makes an acute angle with a speed vector in the tangential direction of the ultrasonic elliptical oscillation having a component only in the drive diving direction of the driven body. The ultrasonic elliptical oscillation 15 generated by combining two oscillations and the phase difference deltatheta between the oscillations of first and second oscillation modes is set as follows; 0<deltatheta<+pi/2 or +pi<deltatheta<+3pi/2. |
