Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)
- 2008.11a
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- Pages.187-188
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- 2008
Design and performances of high torque ultrasonic motor
고토크 초음파 모터의 설계 및 특성에 관한 연구
- Oh, Jin-Heon (Chungbuk National Univ.) ;
- Lim, Jong-Nam (Chungbuk National Univ.) ;
- Park, Cheol-Hyun (Chungbuk National Univ.) ;
- Lim, Kee-Joe (Chungbuk National Univ.)
- Published : 2008.11.06
Abstract
An ultrasonic motor of high torque with a new configuration for application in automobiles is proposed. The newly designed stator is a two sided vibrator consisting of a toothed metal disk with a piezoelectric ceramic ring bonded on both faces of the disk which generates a flexural traveling wave along the circumference of disk. In this configuration, the displacement on the surface of stator may not be confined. It also produces a large vibrating force and amplitude because the vibrator is sandwiched by two piezoelectric plates. It is possible to increase the torque by improving the vibration characteristics. To compute the vibration mode of the motor of diameter 48 mm, the finite element method was used. A 6th mode was chosen as the operation mode with a resonance frequency of about 64.4 kHz. According to this design and measured its performance, a prototype was fabricated. The performance measurement of the prototype motor showed that its stall torque was about 1.8 Nm and efficiency was 37% at 60% of the maximum torque.