# 변위확대기구를 이용한 선형 초음파 전동기의 효율 개선

• 이명훈 (한국교원대학교 기술교육과) ;
• 우상호 (한국교원대학교 기술교육과) ;
• 김진수 (한국교원대학교 기술교육과)
• Published : 2000.11.01

#### Abstract

In this paper, we studied efficiency improvement of linear ultrasonic motor using projection. The principle of ultrasonic motor is to use an elliptic motion generated at the side of the vibrator, and the elliptic motion of the ultrasonic motor was obtained by complex oscillation of L$_1$-B$_4$ mode. As the experimental results, the efficiency of linear ultrasonic motor without projection was 1.52[%] when applied voltage was 56[V] in resonance frequency 58.4[kHz]. The efficiency of linear ultrasonic motor using projection was 3.36[%] when applied voltage was 56[V] in resonance frequency 58.4[kHz]. The efficiency was improved by projection.