Abstract:This paper presents a theoretical modeling method on radial levitation force for ultrasonic bearings actuated by piezoelectric transducers with the aim of predicting their load-carrying capacity. The finite difference method is adapted to calculate the model, which is represented by a high-order multidimensional partial differential equation. The static levitation force testing experiments validate that the established mechanical model can interpret the experimental data well. This model also reveals that the … Show more
This work presents a novel conical rotor non-contact piezoelectric actuator based on the principle of near-field acoustic levitation. The conical rotor is levitated and driven by a single stator, while generating two orthogonal standing waves and superimposing a travelling wave vibration on the stator. A frequency sensitivity analysis is conducted for the stator structural parameters, based on a dynamics calculation. An acoustic field simulation is conducted and the sound pressure distribution is obtained. The acoustic radiation force is calculated at different voltages and frequencies. A prototype is fabricated, and the vibration characteristics are experimentally obtained. A test system is built for the actuator, and the conical rotor successfully achieves levitation and rotation. The levitation height and rotation speed of the 3.37[Formula: see text]g rotor are 0.4[Formula: see text]mm and 2300[Formula: see text]r/min, respectively. The acoustic simulations are validated experimentally and show reasonable agreement.
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