Eddy current braking device suitable for underground torsional vibration reduction and braking method of eddy current braking device

The invention relates to an eddy current braking device suitable for underground torsional vibration reduction and a braking method thereof, and belongs to the technical field of drill string vibration reduction. The eddy current braking device comprises a magnet mechanism and a mounting assembly, and the magnet mechanism comprises a plurality of permanent magnets distributed circumferentially and a supporting circular ring fixedly connected to the outer sides of the permanent magnets; the permanent magnets are circumferentially arranged according to the magnetizing direction of the Halbach magnetic array, and a plurality of groups of mounting holes are formed in the supporting ring at intervals in the circumferential direction; the mounting assembly comprises two end covers and a plurality of connecting rods connected between the two end covers, the connecting rods penetrate through the mounting holes, and the end covers are annular and are connected with the drill rod through bearings. According to the eddy