Effect of differing stator and rotor radii on a three-class rotation-transmission nanobearing driven by a gigahertz rotary nanomotor

Abstract

Particularly critical for a transmission system is a control system that adjusts the output drive speed. Toward this end, we introduce herein a three-class rotation-transmission system. To obtain an effective down-converted rotation-transmission system, the coaxial rotary components are fabricated from carbon nanotubes (CNTs). At 300 K, a gigahertz nanomotor drives nanobearings and thereby changes the output rotation frequency. Considering the chirality of CNTs and the differing radii between stator and the rotor, 12 transmission models are established and tested by molecular dynamics simulations. The rotational-transmission ratio curves for the rotors give the dynamic response of the transmission systems. A down-converting transmission system is obtained when the radii of the stators and rotors differ by 0.3–0.4 nm. The dynamic response given by the rotational-transmission ratio curves for various models leads to useful conclusions about the design of such nanosystems.