Investigation on piezoelectric ceramics with high d/sub 33/, d/sub 31/ for a new type of rotational stepper motor

Abstract

A quarternary system ceramic with high piezoelectric constants, particularly a high d/sub 31/ and high d/sub 33/, was studied. The composition of the materials is PMN-PNN-PZT doped with oxides of Sr, Bi, Sn and La etc. The properties of the materials are as follow: d/sub 33/=(600-750)10/sup -12/C/N, d/sub 31/=(-300-398)/spl times/10/sup -12/C/N, Kp=0.68-0.75. By using this material, a new type of rotational stepper motor, a piezoelectric electro-rheological motor had been made. This kind of motor has unique advantages: no vibration noise, zero wear, low consumed power, large travel range and high resolution etc.