Development of the translational and rotational piezoelectric actuator using a single stator (2st report) -Characteristics of the TR motor

We have developed the piezoelectric actuator having a single stator with translational and rotational motions (TR Motor). The stator has been fabricated as a rectangular metallic solid with a through-hole. The inner surface of the hole generates vibration modes, transferring the energy to a shaft, when voltages at each resonant frequency are applied. In this paper, the performances of the TR motor are clarified toward the practical use. The performance was measured after optimal preload was determined. As the result, the maximum torque and rotational speed were approximately 2.5 mNm and about 120 min^-1, and the thrust force and translational speed were approximately 0.33 N and about 85 mm/s. In addition, the motor characteristics by the amplitude, frequency, and phase difference of the applied voltages were measured.