Electromagnetic device and method for eliminating bending deformation of cylindrical mandrel with large length-diameter ratio

The invention discloses an electromagnetic device and method for eliminating bending deformation of a cylindrical mandrel with a large length-diameter ratio, and belongs to the technical field of mandrel manufacturing. The device comprises a mandrel main body, an in-mold electromagnet, a tension electromagnet, a buoyancy electromagnet and a straightness sensor, wherein the in-mold electromagnet isarranged inside the mandrel main body, the outer wall of the middle of the mandrel main body becomes a magnetic pole, and under the action of the attraction force of the tension electromagnet over the mandrel main body and the repulsion force of the buoyancy electromagnet under the mandrel main body, under assistance of the electromagnet, magnetic field force is adjusted in real time under the guidance of a detection signal of the straightness sensor so as to adaptively correct the bending deformation of the cylindrical mandrel with the large length-diameter ratio, no excessive deformation isgenerated even if winding