Electromagnetic coil device for use of in-mold molten steel capable of serving both as electromagnetic stir and electromagnetic brake

Abstract

To optimize a relation between inner winding and outer winding of a dual-purpose coil device. An electromagnetic coil device is provided, which continuously casts steel for supplying AC current or DC current of three phases or more to an electromagnetic coil to cause an electromagnetic stir or an electromagnetic brake to selectively act on molten steel. The electromagnetic coil is equipped with two teeth (1aa) from a yoke (1ab). The outer winding (1c) is put on the further outside of the two teeth (1aa) having the inner winding (1b) applied. When the number coils of the inner winding (1b) canbe fully wound, the number of coils of the outer winding (1c) is made to be equal to that of the inner winding (1b). If the number of coils of the inner winding (1b) is insufficient, it is made to belarger than that of the inner winding (1b) and equal to or smaller than 2.5 times. On each longer side (1a), n electromagnetic coils (where n is a natural number of 2 or larger) are provided, and a core (1a) is placed in a range of a vertical direction including a discharge hole of a soak nozzle (4) from a meniscus position of the molten steel. Sufficient stirring performance and braking performance can be assured when the required number of coils of the inner winding cannot be wound.

Description

technical field [0001] The invention relates to an electromagnetic coil device for molten steel in a casting mold which can be used as both electromagnetic stirring and electromagnetic braking, which is suitable for controlling the flow of molten steel in the casting mold and continuously casting steel. Background technique [0002] In the case of continuous casting of steel, it is very important to control the flow of molten steel in the mold in terms of operation and quality control of cast slabs. Methods of controlling the flow state of the molten steel in the mold include a method of designing the shape of the dipping nozzle, a method of applying electromagnetic force to the molten steel in the mold, and the like. Among them, the latter method of applying electromagnetic force to molten steel is widely used, and is broadly classified into electromagnetic stirring, which uses electromagnetic force to stir molten steel, and electromagnetic braking, which applies a braking ...

AI Technical Summary

Problems solved by technology

[0012] However, in the case of a dual-purpose coil device, double winding of the inner exciting coil and the outer exciting coil is required, so a large space is required for installing the windings

In particular, the inner excitation coil needs to be installed in the limited space between the two teeth, and the number of turns is limited. Therefore, there is a problem that the electromagnetic stirring ability and the electromagnetic braking ability are limited.

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