ELECTROMAGNETIC COIL DEVICE FOR USE OF IN-MOLD MOLTEN STEEL CAPABLE OF SERVING BOTH AS ELECTROMAGNETIC STIR AND ELECTROMAGNETIC BRAKE

摘要

PROBLEM: To specify optimal dimensions for the core of a multi-function coil. MEANS: An electromagnetic coil system for in-mold molten steel configured to selectively activate electromagnetic stirring and electromagnetic braking of molten steel 2 by applying a direct current or at least a 3-phase alternating current to an electromagnetic coil disposed around a wide side 3b of a mold. The electromagnetic coil is provided with two teeth 21a extending from a yoke 21b. An inner winding 22 is provided around teeth 21a, and an outer winding 23 is further provided around the outside the two teeth 21a provided with inner winding 22. A length L of the teeth 21a is specified to be at least twice the width W of the teeth 21a, and/or the thickness Y of the yoke 21b is specified to be at least twice the width W of teeth 21a. The electromagnetic coil is arranged so that there are n coils on each wide side 3b, where n is a natural number greater than or equal to 2, and a core 21 of a magnetic material is disposed in a range extending in a vertical direction from a position of a meniscus of molten steel and including an outlet port 1a of an immersion nozzle 1. ADVANTAGEOUS EFFECT : Sufficient stirring capacity and braking capacity can be ensured, while saving energy and reducing the weight of the core.