How is the electromagnetic stirring of the induction melting furnace formed?

The molten iron in the induction melting furnace is forced to act in the magnetic field as follows:

1. The molten iron in the crucible generates electromotive force in the magnetic field generated by the induction coil. Due to the skin effect, the eddy current generated by the molten iron and the current passing through the induction coil are in the opposite direction, resulting in mutual repulsion;

2. The repulsive force received by the molten iron always points to the axis of the crucible, and the molten iron is also pushed to the center of the crucible;

3. Since the induction coil is a short coil, there is a short part effect at both ends, so the corresponding electric power at the two ends of the induction coil becomes smaller, and the electric power distribution is small at the upper and lower ends and large in the middle.

Under the action of this force, the molten iron first moves from the center to the axis of the crucible, and then flows upward and downward respectively after reaching the center. This phenomenon continues to circulate, forming a violent movement of the molten iron. In actual smelting, the phenomenon that the molten iron swells up and up and down in the center of the crucible can be cleared. This is electromagnetic stirring.