Research on The Axial Magnetic Compensation Method of Ferromagnetic Thin Shell Cylinder

Ferromagnetic materials will cause abnormal magnetic field in the surrounding space under the action of geomagnetic field. The existing magnetic field anomaly control method mostly uses compensation coil to generate reverse magnetic field. In this paper, ferromagnetic thin shell cylinder is taken as the research object, for the problem of excessive magnetization caused by excessive coil current in the existing axial magnetic field compensation method, an axial magnetic field compensation method based on internal and external coils is proposed. The magnetic field distribution model under the action of axial uniform geomagnetic field and compensation coil is established. By optimizing the current distribution of the coil, this method can greatly reduce the magnetic field intensity in the thin shell material, effectively avoid extra magnetic anomaly caused by the magnetization of the thin shell in the case of the constant space magnetic field compensation effect.