PERFORMANCE SIMULATION OF TRAVELING

WAVE ULTRASONIC MOTOR BASED ON

VISCO-ELASTIC CONTACT MODEL

SUN Fengyan  TIAN Xiu  QU Jianjun

(Department of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001 )

Abstract: Based on a contact model of traveling wave ultrasonic motor with visco-elastic contact layer on stator surface, effects of thickness of frictional material and its modulus of elasticity on characteristic of the motor are simulated using MATLAB method. The results show that, the thinner the thickness, and the higher the modulus of elasticity, the better the motor characteristics. The interface conversion efficiency is higher when thickness is smaller than 0.5 mm and load torque is greater than 36 N•mm; It has a maximum when thickness is about 0.2 mm. As a result, it is more suitable to choose 0.2 mm for the thick-ness of the material. When modulus of elasticity is higher than about 1.5 GPa, the interface conversion efficiency is higher in the greater range of load torque, so the motor has better driving capacity. These results have certain theory directive significance to the choice of the frictional material. This model is compared with the compliant slider and rigid stator model. The results show that, the motor based on this model will gain big- ger output torque.

Key words: Ultrasonic motor Visco-elastic Contact model Frictional material

CLC No: TM35

国家自然科学重点基金(50235010)和哈尔滨工业大学跨学科交叉研究基金(HIT.MD2002.08)资助项目. Received 20051027, received in revised form 20051220