关键词: 近场声悬浮, 球转子, 非接触, 耦合

Abstract:

Based on near-field acoustic levitation mechanism a novel piezoelectric actuator with spherical rotor was proposed. Special piezoelectric actuators were designed to produce the axial and radial near-field ultrasonic radiation, respectively, so that a spherical rotor can achieve controllable and stable levitation,and rotation with high speed. The proposed
noncontact actuator can be applied to high speed motor,ball bearing transmission and attitude sensor in the field of aerospace. The flexible control of suspended rotated rotor can be realized by different combination applications of two actuators radiating the axial and radial acoustic field. First the configurations and working principles of the axial/radial coupling noncontact piezoelectric actuator were  introduced.Then the acoustic field distribution resulting from the presented actuators was simulated numerically,and levitation and drive mechanism of spherical rotor was deeply investigated. Finally a prototype was manufactured, and the characteristics measurement system was built. By means of the laser displacement sensor the levitation characteristics of the proposed actuator was experimentally obtained, and the rotary speed of 691.5r/min is achieved.

Key words: near-field acoustic levitation, spherical rotor, noncontact, coupling