アルミナ/チタン酸ジルコン酸鉛による振動子を用いた圧電モータを開発した Wu (OB) の論文が IEEE Transactions on Industrial Electronics に掲載されました。最新の Impact Factor は 7.5 以上です。

J. Wu, Y. Mizuno, and K. Nakamura, “Piezoelectric motor utilizing an alumina/PZT transducer,” IEEE Trans. Ind. Electron., vol. 67, no. 8, pp. 6762-6772 (2020).

To enhance the torque and output power of rod-shaped piezoelectric rotary motors, in this study, we employ alumina to substitute the metal parts of transducers considering that the high Young’s modulus of alumina may avoid preload-induced vibration reduction and enable the transducers to generate high driving force. Besides, alumina exhibits a relatively low density compared to most of the materials commonly used as vibrating bodies (except aluminum alloy); this probably enhances the power densities of piezoelectric motors. To assess the validity of our proposal, we constructed a Langevin-type alumina/lead-zirconate-titanate (PZT) motor and investigated its load characteristics. The transducer, 35 mm in outer diameter, operated in orthogonal bending (B2) modes and drove the rotor with its end surface. The alumina/PZT motor yields the maximal torque and maximal output power of 1.56 N·m and 26.0 W, respectively, both of which exceed those of the metal/PZT motors having identical structure and working in B2 modes. In addition, its power density reaches 56.3 W/kg, relatively high among rod-shaped rotary motors though some of which work in more powerful modes. This study validates the effectiveness of our proposal and provides a new approach to improve the performance of rod-shaped piezoelectric rotary motors.