Numerical and experimental investigations on the influence factors of diamagnetic levitated electrostatic motor

The friction issue induced by scale reduction has been a challenge for the development of conventional micromotor. With the inherent merits of friction-free and self-passive stabilization, diamagnetic levitation emerges as a promising approach to tackle this friction issue. In this paper, a micromotor based on diamagnetic levitation and electrostatic drive technologies is developed. The driven model of micromotor is established, and a systematical investigation is performed to analyze the effects of influencing parameters on the motor from both theoretical and experimental perspectives. To improve the performance of micromotor, the structural parameters are also optimized in stable operating condition. With the optimized structural parameters, the motor can reach a speed lower than 300 rpm and the required excitation voltage was reduced from 700 to 400 V. This work is a first step in a research program aiming at the optimization of diamagnetic levitated rotor by increasing the performances and reducing its energy consumption. The proposed model reveals that the influence laws of factors can also be extended to study other high-performance micromotors, though it also identifies certain limitations that should be addressed in future research.