| 摘要 |
PURPOSE:To suppress spurious vibration by securing one side and of an elastic plate in which a piezoelectric element is mounted on its main face, and mounting a piezoelectric actuator on the main face of the other end thereof. CONSTITUTION:An ultrasonic motor is composed of a stainless steel elastic plate 21, a piezoelectric ceramic plate 22, electrodes 23, and a piezoelectric actuator 24, and the plate 21 is clamped with bolts 27 at stainless steel jigs 25, 26. When an AC electric field of 24kHz is applied to the plate 22, an AC electric field in which its phase is advanced at 90 deg. is applied to the actuator 24, and a stainless steel roller 28 is brought into pressure contact with the top of the actuator 24, the roller 28 is rotated in a direction of an arrow 29. Thus, when the volume of the piezoelectric ceramics is equal as compared with the ultrasonic motor using a longitudinal bending multiplex mode vibrator, a maximum speed approx. 1.5 times as high and a starting driving force twice as large are obtained. |
