Design and performance evaluation of a novel mechanism with screw jet motion for a hybrid microrobot driven by rotational magnetic field

摘要

Wireless microrobots are endowed with promising future for medical tasks. In this paper, a novel mechanism with screw jet motion for a hybrid microrobot. The microrobot has a compact structure. It consists of an outer shell, a screw structure and an o-ring magnet as an actuator, which is fitted inside the microrobot. It is driven by a rotational magnetic field which is generated by three-axis Helmholtz coils. While the microrobot is in the magnetic field, the actuator is conversion of synchronous rotation with a rotating field using a “screw jet motion” to pull fluid through the centre of the microrobot. The experimental results indicated the microrobot can realize the flexible motion with good performance.