定在波型超音波アクチュエータの低速駆動法

概要

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Ultrasonic actuators have applicability in various fields such as mechanical engineering and medical engineering owing to their advantage such as high torque, soundless motion and so on. However, these actuators have a dead-zone property, that is, they cannot be driven if it must be applied a signal having a driving frequency near the resonance frequency or a high voltage above a certain voltage. Therefore, it is difficult to drive ultrasonic actuators at low-speed. In this note, we propose a method for low-speed driving of a standing-wave-type ultrasonic actuator which can drive using one phase signal. In this method, an intermittent signal generated using a standard PC is supplied to the actuator instead of a continuous signal. Experimental results show that the property of a low-speed drive of less than 5 rpm was achieved with the proposed method.