An ultrasonic motor using an injection-molded plastic rotor and its application to motor-driven potentiometers

摘要

Ultrasonic motors, used as compact servomotors for precision positioning, have many advantages over electro- magnetic motors. However, they have a complicated struc- ture and require a complicated drive circuit, which makes them costly. This study has realized a low-cost ultrasonic motor for application to low-cost products. The first appli- cation target was as the motor of a high-voltage focus adjustment potentiometer in a CRT monitor. A motor was fabricated and operated successfully.