Human‐Scale Rotating Magnetic Field Delivery With Permanent Magnets Under Anatomic and Robotic Constraints

Rotating magnetic fields (RMFs) are widely used to actuate untethered microrobots, yet delivering clinically relevant RMFs at human scale remains challenging. Here, we create a quantitative framework for human‐scale RMF delivery using robot‐arm‐mounted permanent magnets. It links anatomical separation, surface‐clearance constraints, magnet geometry, rotational inertia, and robot‐arm limitations to define a feasible RMF operating envelope. Magnet geometry is most important when target separation is comparable to magnet size; in this regime, diametrically magnetized cylinders provide the most efficient field delivery at constant magnet volume. At larger separations, field delivery converges toward dipole‐like scaling and becomes primarily governed by total magnet volume. Across the dominant microrobot operating envelope (5–30 mT, 1–30 Hz), required magnet mass ranges from sub‐kilogram values for limb and intracranial targets to more than 30 kg for deep thoracic access. As magnet size increases, rotational inertia rapidly emerges as the dominant mechanical constraint, with limb and intracranial targets remaining feasible whereas some thoracic scenarios exceed practical mechanical limits. We demonstrate a representative actuator designed within the proposed framework tested on a human‐scale vascular phantom under flow. This work provides a foundation for codesigning translational microrobots and their magnetic drive platforms tailored for relevant anatomical targets.