1A1-B06 Speed Control of Micro Ultrasonic Motor with Magnetic Encoder

Abstract

Recently, there are increasing needs for high power micro actuators in order to downsize the mechatronics devices. The purpose of this paper is to design a new type of micro ultrasonic motor which has a micro encoder. This motor is a rectangular prism with side-lengths 2.6mm, 2.6mm and 9.8mm. The micro encoder mounted on the ultrasonic motor is a magnetic type. This micro encoder was united with a motor shaft and a magnetic drum has 10 poles by 0.43mm pitch. This encoder outputs 20 pulses every revolution. To evaluate this encoder, the revolution speed of the electromagnetic motor was controlled.