STRUCTURE STUDY AND THEORETICAL ANALYSIS

ON NEW TYPE TRAVELING WAVE

PIEZOELECTRIC MOTOR

ZHANG Donghua  CHEN Zaili  LI Youguang

(School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001)

Abstract: Traveling wave ring-type or disc-type piezoelectric motor tends to lose the characteristic of large torque with low speed as its diameter is small. Plus its structural restriction, the dynamic point contact between the stator and the rotor leads to many disadvantages such as rough running, serious abrasion, low driving torque, etc. To make up for these shortages a new type traveling wave piezoelectric motor with cylinder stator is presented, which features the cylindrical stator and the line contact instead of the traditional ring or disc type and the point contact. The operation mechanism of the new type traveling wave piezoelectric motor and the principle of its driving system are also explained. The theoretical analysis of the stator proves that the motor with this new structure can well meet the demands for driving and operating. Using the finite element software ANSYS for the analysis of the vibration mode of the stator, a theoretical principle in selecting the vibration mode of the stator is offered. Finally a cylinder-driving piezoelectric motor with a diameter 20 mm is manufactured, and the test on its output characteristics is carried out. Result of the test shows that the ratio of output torque/mass is 0.426.

Key words: Cylinder-driving Large torque Traveling wave Piezoelectric motor Finite element method

CLC No: TM35

国家自然科学基金资助项目(50175018). Received 20051027, received in revised form 20051230