Design and construction of shaft-driving type piezoceramic ultrasonic motor.
A new approach in design of shaft-driving type piezoceramic ultrasonic motor is proposed. The stator of motor consisted of a commercial available buzzer disk in which a piezoceramic membrane is adhered to a metal sheet. The wave propagation on the metal sheet was generated by extended-shrunk force from piezoceramic oscillation. Driving energy came from the vibration modes by mechanical-electrical oscillation of the metal sheet in corresponding to converse piezoelectric effect using a single-phase AC voltage power. Where the relative elliptic motion was occurred between the bearing seat and rotor in order to kinematical delivery, the rotor being driven was connected directly on the bearing seat to transmit the dynamic power with frictional contact force. In analysis of dynamic features, the system transfer function of admittance and equivalent circuit was obtained. The rotating speed of the prototype motor could be reached as high as 2000 rpm on the driving condition of 72 kHz, +/-10 V(pp), and 0.2 A. The maximum torque was less than 0.003 Nm. It could be utilized in the driver of CD, or the cooling fan in the computer CPU.
Wen
Fuh-Liang
FL
Department of Mechanical Engineering, Graduate Institute of Automation and Mechatronics, St. John's & St. Mary's Institute of Technology, 499, Sec. 4, Tam King Road, Tamsui, Taipei 25135, Taiwan. ericwen@mail.sjsmit.edu.tw
Mou
Shann-Chyi
SC
Ouyang
Minsun
M