Patent ID: 7972556

Claim:
An electromagnetic stirring apparatus, comprising: a vessel for containing an electroconductive material in a molten state; an axially traveling magnetic field generating coil for generating magnetic line of force in an axial direction of the vessel towards the electroconductive material in a molten state contained in the vessel from an outside of the vessel; and strip-shaped magnetic plates disposed along a circumferential direction of the vessel and at spaces between the coil and the vessel a plurality of strip-shaped magnetic plates disposed between the coil and the vessel, wherein a plurality of the strip-shaped magnetic plates are disposed along the circumferential direction of the vessel with a space between each magnetic plate; and whereas said magnetic plates provide portions in the vessel in which an alternating current magnetic field tends to pass and portions in the vessel in which the alternating current magnetic field cannot pass easily are formed alternately along the circumferential direction of the vessel.