| Title |
Design of Roll-Screen System Using Ultrasonic Motor |
| Authors |
Jeong-Do Kim ; Woo-Suk Jung ; Yu-Kyung Ham ; Dong-Jin Kim ; Chul-Ho Hong |
| Keywords |
Roll-Screen ; Piezoelectric ultrasonic motor |
| Abstract |
For silent operation, Roll-Screen has been designed by using piezolelectric ultrasonic motor. To drive the ultrasonic motor, a digitally controlled drive system has been designed by using PLD. And, to measure the position and velocity of Roll-Screen, encoder with 36 pulse/revolution is used. This paper proposed a new method for a precise velocity control of ultrasonic motor, in spite of using low-level encoder. The proposed method use a non-fixed sampling time and compensate the initial nonlinear characteristics of ultrasonic motors. |