A Study of 3-D Magnetic Field Regulation Method With Dynamically Variable Multichannel Orthogonal Array Coils

To solve the problems of the traditional magnetic shielding cylinders compensation coil system, such as complex structure, large volume, and insufficient flexibility of magnetic field (MF) adjustment, this study proposes a design method of d single-layer dynamically variable multi-channel orthogonal array coils (DVM-OAC) in a spindle-shaped magnetic shielding cylinders (sMSC). It uses an array of orthogonal crossed wires on a single-layer curved grid (R and A direction). Through multi-channel independent control and dynamic current regulation, the DVM-OAC achieves precise generation and real-time compensation of three-axis (x,y, andz) uniform MF. Compared with the traditional structure of three independent Helmholtz coils stacked on top of each other, the DVM-OAC integrates the three-axis function in a single physical space, which reduces the volume by about 21.46%. The percentage of the space where the uniformity of the DVM-OAC is less than 3% reaches 3.98%, which is much larger than that of the three-axis Helmholtz coils, which is 0.82%. Experiments indicate that DVM-OAC can ensure high triaxial MF uniformity in the center region of sMSC, which is consistent with the theoretical results. This technology provides a new idea for high-precision magnetic environment regulation, which is especially suitable for wearable devices, implantable medical devices and other scenarios with stringent requirements for lightweighting and flexibility.