Non-metal high-power ultrasonic motors utilizing Langevin-type alumina/PZT transducers operated in orthogonal bending modes

摘要

To apply ultrasonic motors to the chemical industry, in this study, alumina is employed as vibrating bodies of transducers as it offers not only high chemical resistance but also a possibility to generate high output torque and power of motors due to the high Young's modulus. First, a Langevin-type transducer was constructed by clamping several annular lead-zirconate-titanate disks between two rod-shaped alumina vibrating bodies, and a traveling wave was excited to drive the rotor by a superposition of two orthogonal standing waves in bending modes. Subsequently, the performance of the alumina/PZT motor was assessed. At the applied voltage of 150 V, the maximal output torque and power reached 1.5 Nm and 8 W, respectively.