Development of a Piezo-electric Cycloid Motor.

The paper proposes a piezoelectric cycloid motor, in which the cycloid gear mechanism is used to convert the expansion and contraction of the piezoelectric actuators into the rotational motion of the motor. Making a prototype of the output characteristics of a prototype were investigated experimentally. The results obtained are as follows. (1) The proposed rotational principle was effective. (2) The measured rotational speed compared well with the values calculated. (3) The maximum output torque was 0.014 Nm for all the rotational speeds; it was 78 percent of the calculated value. The motor rotated steadily and kept its rotational speed for all the rotational speeds even when the load was increased up to its maximum value. (4) The efficiency increased as the rotational speed and the output torque increased, and reached the highest value, 25.5 percent, at 16 r.p.m. within the measuring range of driving frequency. >