A kind of piezoceramic shaft-driving type ultrasonic motor is a
piezoelectric disc device as the driving stator of the motor in which the
A.C power is supplied to form extend-contract motion of piezoceramic based
on converse piezoelectric effect. The flexural wave of back plate is
generated by push-pull force of piezoceramic oscillation. By utilizing the
pin head above the stator as the dynamic shaft bearing wherein the rotor
being drive is connected directly on the bearing to transmit the power
with friction contact force. The rotating speed of the prototype motor
could be reached as high as 3000 rpm on the driving condition of 74 kHz,
voltage +/-10Vpp, and 0.2 A current, wherein the torque is about 0.003
N.multidot.m. It could be utilized in the driver of CD, the actuator in
the biomedical engineering, or the cooling fan in the computer CPU.
