| 摘要 |
PURPOSE:To make the speed and starting torque of an apparatus higher by fixedly arranging a non-resonating, expansible and contractible laminated ceramic actuator on the central principal plane of a vibrator functioning in a longitudinal vibration secondary mode. CONSTITUTION:An ultrasonic motor is composed of a stainless steel rectangular flat plate 31, a piezoelectric actuator 32, a copper roller 33, a spring 34, and piezoelectric ceramic plates 35, 37-39. The polarized arrangement of said piezoelectric ceramic plates is such that ceramic plates 38-39 contract when ceramic plates 35, 37 extend, and the resonance frequency of a longer direction longitudinal vibration secondary mode and the tension of said spring 34 in said vibrator are adjusted to 25kHz and 10kgf, respectively. Thus, when the AC electric field of 25kHz is applied to ceramic plates 35, 37-39 and that with the same frequency and a phase advancing by 20 deg.-30 deg., to said actuator 32, said roller 33 rotates in the direction of the arrow 301. |
