Abstract

Abstract — In this work, we develop methods for controlling multiple untethered magnetic micro-robots (called Mag-µBots), with all dimensions under 1 mm, without the need for a specialized surface. We investigate sets of Mag-µBots that are geometrically and magnetically designed to respond uniquely to the same magnetic fields. The responses of geometrically dissimilar Mag-µBots with similar magnetization and a group of identically-fabricated Mag-µBots are investigated. By controlling the magnetic field waveforms, individual and subgroups of Mag-µBots are able to locomote in a parallel but dissimilar fashion. Specifically, the pulsing frequency of the imposed driving magnetic fields is used as a selection method among the Mag-µBots. This method for accomplishing motion discrimination is discussed, modeled, and tested. Independent global positioning of two and three robots is demonstrated in two-dimensional space. While individual Mag-µBot velocities can be as high as 7 mm/s, the effective velocities during multirobot control are found to be up to 2 mm/s. As this control method is accomplished without the use of a specialized surface, it has potential applications in areas such as micro-fluidic systems and bio-manipulation. I.

Citations