Non-Contact Manipulation of Induced Magnetic Dipoles

TL;DR

This paper demonstrates closed-loop 3D position control of conductive, non-magnetic objects using oscillating magnetic fields, advancing magnetic manipulation techniques for applications like space debris recycling.

Contribution

It introduces closed-loop control methods for induced magnetic dipoles, enabling precise 3-DOF positioning of conductive objects, a significant step beyond previous open-loop approaches.

Findings

Successful closed-loop control of a semi-buoyant aluminum sphere.

Evaluation of different force inversion methods.

Potential applications in space debris recycling.

Abstract

Extending the field of magnetic manipulation to conductive, non-magnetic objects opens the door for a wide array of applications previously limited to hard or soft magnetic materials. Of particular interest is the recycling of space debris through the use of oscillating magnetic fields, which represent a cache of raw materials in an environment particularly suited to the low forces generated from inductive magnetic manipulation. Building upon previous work that demonstrated 3D open-loop position control by leveraging the opposing dipole moment created from induced eddy currents, this work demonstrates closed-loop position control of a semi-buoyant aluminum sphere in lab tests, and the efficacy of varying methods for force inversion is explored. The closed-loop methods represent a critical first step towards wider applications for 3-DOF position control of induced magnetic dipoles.