JPH0890169A - Fluidization controller for molten metal - Google Patents

Abstract

PURPOSE: To efficiently raise the magnetic fields acting on molten metal and to suppress an increase in the outside diameter of a device by respectively specifying the widths in the y direction of the first iron core and second iron core of iron cores. CONSTITUTION: Since the width y1 in the y direction of the first iron core is Ys <Y1 <Yc , respective electric coils CL can be inserted into one of slits by moving these coils in the x direction in the form of passing the iron core L1 into their inside spaces and moving the coils in the x direction. The gap ya above the slit depth ys , then, exists between the rear surface of the iron core L1 opposite to its slotted surface and the side of the electric coils CL opposite to the side to be inserted into the slots. The second iron core L6 of which the width y6 in the y direction is yc -y1 <y6 <yc -(y1 -ys ) is inserted into the gap ya after the electric coils are mounted to the iron core L1 in such a manner, by which the gap in the remaining y direction is made into ya -y6 and the gap is decreased by as much as y6 . The sectional area of the iron core enclosed by the electric coils is correspondingly increased, by which the saturation magnetic flux quantity is increased and the powerful magnetic fields are applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for applying an alternating magnetic field and / or a direct magnetic field to a molten metal in order to drive and / or brake the molten metal.

[0002]

2. Description of the Related Art For example, the above-mentioned flow control device has a groove extending in the x direction and facing the upper surface of the molten metal or along a mold side surrounding the molten metal, and is concave in the y direction orthogonal to the x direction. It has an iron core having a plurality of slots distributed at a predetermined pitch in the x direction, and a plurality of electric coils through which the iron core penetrates, one side of which is fitted in each slot (for example, JP-A 1-228645, JP-A-3-258442).

By applying a voltage having a phase shift, for example, each phase voltage of a polyphase alternating current, to each of the electric coils, a moving magnetic field in the x direction is generated on the surface in which the slots are carved (the surface facing the mold), When this acts on the molten metal, a driving force acts on the molten metal in the same direction as the moving direction of the magnetic field. If the direction of the moving magnetic field is the same as the flowing direction of the molten metal, the flow control device accelerates the flowing of the molten metal. If the direction of the moving magnetic field is opposite to the flow direction of the molten metal, the flow of the molten metal is damped. When a DC voltage is applied to the electric coil and a static magnetic field is applied to the molten metal, a braking force for restraining the moving direction is applied to the molten metal.

[0004]

Since this type of flow control device requires a relatively large electromagnetic force, the shape of the iron core and each electric coil mounted in each slot thereof is relatively large, and therefore, Each electric coil is shaped in advance in a rectangular shape, and each electric coil is inserted in its inner space (air core portion) in the x direction by passing a substantially rectangular parallelepiped iron core with a plurality of slots cut in one end surface. Move and then move in the y direction to insert into one of the slots. Therefore, the outer diameter of the iron core is
Air core part (internal space) of the electric coil to be installed, even if large
Limited in size.

Therefore, assuming that the width of the iron core in the y direction is the depth of the slot in the y direction and the width of the inner space of the electric coil through which the iron core penetrates in the y direction, y1 <yc. Yes, after inserting the electric coil into the slot of the iron core, the slot depth should be between the back surface facing the slotted surface of the iron core and the side facing the slot of the electric coil. There is a void of ys or more. Also, the electric coil to be mounted is rectangular (b-shaped), but the corners cannot be right angles and draw a curved curve. That is, the corner has a considerably large arm, where the width of the inner space of the electric coil in the y direction is shorter than yc, so that the height of the iron core ( When the length (in the z direction) is increased, the width y1 in the y direction of the iron core must be further shortened, which causes the void to be further increased (wider in the y direction).

In order to efficiently increase the magnetic field acting on the molten metal, 1. Increase core slot depth ys,
2. A large current is passed through the coil. However, if the slot depth of the iron core is increased by ys, the gap becomes large for the above-mentioned reason, that is,
The cross section (effective cross section) that the electric coil goes around becomes small,
Since it is easy for magnetic saturation to occur, the current flowing in the coil must be reduced. Further, in a place where the work space is limited, the outer diameter of the apparatus becomes larger as the depth of the iron core slot becomes deeper, which naturally limits the depth of the iron core slot. The first object of the present invention is to efficiently increase the magnetic field acting on the molten metal, and the second object is to suppress the increase of the outer diameter of the apparatus and increase the magnetic field acting on the molten metal.

[0007]

The first invention of the present application is as follows:
An iron core having a plurality of slots extending along the molten metal in the x direction and concave in the y direction orthogonal to the x direction and distributed at a predetermined pitch in the x direction; and a plurality of iron cores through which the iron core penetrates,
In a molten metal flow control device having an electric coil with one side fitted in each slot, the depth of the slot in the y direction is defined as ys, and the depth of the electric coil in the y direction of an inner space of the iron core that penetrates Assuming that the width is yc, the iron core has the slot, and a first iron core (L1) in which the width y1 in the y direction is ys <y1 <yc and a slot of the first iron core (L1) are carved. It has a second iron core (L6) which is in contact with the back surface facing the surface and extends in the x direction and has a width y6 in the y direction of yc-y1 <y6 <yc- (y1-ys).

The second invention of the present application is that the x extending along the molten metal in the x direction and concave in the y direction orthogonal to the x direction is used.
In a molten metal flow control device having an iron core having a plurality of slots distributed in a predetermined pitch in a direction and a plurality of electric coils through which the iron core penetrates, one side being fitted in each slot. Let y be the depth in the y direction,
When the width in the y direction, the height in the z direction, and the width in the diagonal direction of the inner space of the electric coil are yc, zc, and yzc, respectively, the iron core has the slot and the width y in the y direction.
1 is ys <y1 <yc, and the height z1 in the z direction is z1 <zc
The first iron core (L1) and the rear surface facing the slotted surface of the first iron core (L1) are extended in the x direction and have a width y6 in the y direction of yc-y1 <y6 <yc- (Y1-ys), z
The second iron core (L6) whose height in the direction is z1 is brought into contact with the upper surface or the lower surface of the first iron core (L1) in the z direction and z1 + z2 + z3 <zc
A third slot having a height z2 + z3 which is aligned with the slot of the first iron core (L1) and in which the electric coil is fitted, and whose width (y1 + y6) in the y direction is larger than yc and smaller than yzc
And an iron core (L2, L3).

In the second preferred embodiment of the invention,
The third iron core (L2, L3) is joined to the upper surface of the first iron core (L1) in the z direction, and the lower iron core (L2) of height z2 is joined to the lower surface of the first iron core (L1) in the z direction. It consists of a joined iron core (L3) of height z3.

The preferred embodiments of the first and second inventions are in contact with the upper surface and the lower surface of the iron core, and the front end surface is substantially the same as the slotted surface of the iron core. A plurality of fourth coils inserted between the sides orthogonal to the sides fitted in the slots of the electric coils adjacent to each other in the x direction.
An iron core (L4, L5) is further provided.

In order to facilitate understanding, the corresponding elements or corresponding symbols of the embodiments to be described later with reference to the drawings are added in parentheses for reference.

[0012]

According to the first invention, the first iron core (L1)
Since the width y1 in the y direction is ys <y1 <yc, each electric coil has an iron core in its inner space as in the conventional iron core.
It can be moved through the (L1) in the x direction and then in the y direction to be inserted into one of the slots. Therefore, after inserting the electric coil into the slot of the iron core (L1),
There is a gap (ya) having a slot depth ys or more between the back surface facing the slotted surface of 1) and the side facing the slotted side of the electric coil. Like this iron core (L1)
After the electric coil is attached to the second coil, the second iron core (L6) having a width y6 in the y direction of yc-y1 <y6 <yc- (y1-ys) is inserted into the gap (ya), and the remaining The air gap in the y direction becomes ya-y6, and the air gap decreases by y6, the iron core cross-sectional area (effective cross-sectional area) around which the electric coil circulates increases, and the saturation magnetic flux amount there increases. Even if a higher level current is applied than before, magnetic saturation does not occur and a stronger magnetic field can be applied to the molten metal. The outer diameter of the device does not increase because the second iron core (L6) passes through the inner space of the electric coil.

A second aspect of the invention is that in addition to the second iron core (L6), the first iron core (L1) is brought into contact with the upper surface or the lower surface in the z direction of z1.
Iron core having a height z2 + z3 such that + z2 + z3 <zc
It has a slot which is aligned with the slot (L1) and in which the electric coil is fitted, and the width (y1 + y6) in the y direction is larger than yc
and a third iron core (L2, L3) smaller than zc. Since the y-direction air gap length of the corner portion of the electric coil is shorter than yc, after inserting the first iron core (L1) into the electric coil, the length of the first iron core (L1) is longer than the y-direction length. 3 Iron core (L2, L3) cannot be inserted into the inner space of the electric coil. Therefore, in this case, the third iron core (L2, L3) is first inserted into the electric coil at an angle so that both ends (front and back) face the diagonal corners of the electric coil. . The width (y1 + y6) of the third iron core (L2, L3) in the y direction is the diagonal length yz of the inner space of the electric coil.
Such insertion is possible as long as it is less than c. Then, insert one side of the electric coil into the slot of the third iron core (L2, L3), press the third iron core (L2, L3) to the other side orthogonal to this one side, and in the empty space, as described above. The first iron core (L1) may be inserted into the slot, one side of the electric coil may be inserted into the slot, and the second iron core (L6) may be further attached as described above.

According to the second aspect of the invention, since the voids (ya, z2, z3) of the electric coil are filled with the second iron core (L6) and the third iron core (L2, L3), the electric coil is correspondingly filled. The iron core cross-sectional area (effective cross-sectional area) that circulates increases, the saturation magnetic flux amount increases, and even if a higher level current is applied to the electric coil, magnetic saturation does not occur and a stronger magnetic field is melted. Can be given to metal. The outer diameter of the device does not increase because the second iron core (L6) passes through the inner space of the electric coil.

In the preferred embodiment of the second aspect of the invention, the third aspect
The iron cores (L2, L3) are joined to the upper surface of the first iron core (L1) in the z direction and the iron core (L2) of height z2, and to the lower surface of the first iron core (L1) in the z direction. It consists of an iron core (L3) with a height of z3, and each of them fills the upper void and the lower void of the first iron core (L1) in the z direction, so the effective cross-sectional area of the entire electric core that the electric coil circulates. And a stronger magnetic field can be applied to the molten metal. If the third iron core is arranged only on the lower side (or the upper side) of the first iron core (L1), a void remains on the upper side (lower side).

In the preferred embodiments of the first and second inventions, the fourth iron cores (L4, L5) are provided between the sides of the adjacent electric coils which are continuous and orthogonal to the sides fitted in the slots. Inserting. The fourth iron core (L4, L5) expands the height of the entire iron core in the z direction to the outer width of the electric coil in the z direction. That is, the height of the magnetic poles in the z direction becomes equal to the height of the coil, whereby leakage magnetic flux (magnetic flux that does not face the molten metal) is reduced, and a stronger magnetic field can be applied to the molten metal. Since the 1st to 3rd iron cores (L1, L2, L3, L6) pass through the inner space of the electric coil, and the 4th (L4, L5) is between adjacent coil sides, the outer diameter of the device increases substantially. do not do.

Other objects and features of each invention of the present application will be apparent from the following description of embodiments with reference to the drawings.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the appearance of an embodiment common to each invention of the present application. In the space surrounded by the inner wall 1 of the continuous casting mold,
Molten steel MM is injected through a pouring nozzle (not shown),
The meniscus (surface) of the molten steel MM is covered with the powder PW. The mold is cooled by the cooling water flowing in the water box 2, and molten steel MM
Is gradually solidified from the surface in contact with the mold and the slab SB is continuously drawn out. However, since molten steel is poured into the mold, there is always molten steel MM in the mold. Two linear motors 3F and 3L, which are one embodiment of the present invention, are provided at the position of the meniscus level (height direction z) of the molten steel MM, and these are portions immediately below the meniscus of the molten steel MM (surface layer area). Give electromagnetic force to.

In FIG. 2, the inner wall 1 shown in FIG.
The cross section (enlarged cross section along line 2a-2a) horizontally broken at the iron cores 4F and 4L of the rotor 3F and 3L is shown in FIG.
The a-3a line enlarged cross section is shown. Further, FIG. 4 shows the linear motor 3L shown in FIG. 3 in which the dimensions (in mm) of each part are entered, and in FIG. 5, the cross section taken along the dashed line 5a-5a of the linear motor 3L shown in FIG. (Unit: mm).

Referring to FIGS. 1 and 2, the inner wall 1 of the mold is composed of opposing long sides 5F and 5L and opposing short sides 6R and 6L, and each side is a copper plate 7F, 7L.
8R, 8L, non-magnetic stainless steel plate 9F, 9L, 10
It is a backing of R and 10L. In this example,
The iron cores 4F, 4L of the linear motors 3F, 3L are slightly longer than the effective lengths of the mold long sides 5F, 5L (the lengths in the x direction in contact with the molten steel MM), and the depths (the lengths in the y direction) are added to their entire lengths. 36 of the same slot are cut at a predetermined pitch.
Electric coils CF1 to CF36 are attached to the respective slots of the iron core 4F of the linear motor 3F. Similarly, electric coils CL1 to CL36 are attached to the respective slots of the iron core 4L of the linear motor 3L.
F and 3L are intended to give thrust in the x direction to the molten steel MM along the long sides 5F and 5L with which the molten steel MM contacts.

FIG. 6 shows an exploded perspective view of the linear motor 3. Referring to FIG. 4 and FIG. 6, 36 slotted first iron cores L1 and third iron cores L2, L3 are substantially rectangular parallelepiped laminated iron cores, and second iron core L6 is a slotless rectangular parallelepiped. It is a laminated iron core. A process of assembling the elements shown in FIG. 6 into the shape shown in FIG. 4 will be described. First, the width in the y direction is y1
+ Y6, y1 + y6 <yzc, and the third iron cores L2 and L3 whose heights in the z direction are z2 and z3 are passed through 36 electric coils (CL30). At this time, if one side of the electric coil is horizontal, the third iron cores L2 and L3 are inclined by 45 ° and are parallel to the diagonal line of the electric coil. Then, each electric coil is inserted into each slot, and the third iron cores L2, L3 are made horizontal (actually, the third iron cores L2, L3 are placed horizontally and fixed, and the electric coils are moved one by one. The third iron core L2, L
3). Next, the upper third iron core L2 is connected to the lower L
3 is upwardly spaced from each other, and a space slightly larger than z1 is opened in the z direction between the two and fixedly supported, and in the space, the width in the y direction is y1, ys <y1 <yc, and the height in the z direction is z1. One side of the electric coil (vertical side) is inserted into the slot of the first iron core L1 by driving through the first iron core L1 (x direction) and in the y direction.
Inset. Next, in the gap between the back surface of the first iron core L1 (the surface facing the front surface having the slot) and the rear side (vertical side) of the electric coil, the widths in the y direction are y6, yc-y1 <y6 <y.
The second iron core L6 of c- (y1-ys) is passed through (x direction). Then, the first iron core L1, the second iron core L6, and the third iron cores L2, L3 are integrated with each other by a fastener (not shown) (FIG. 4). Then, the interposing material is press-fitted into the space between the iron core and the electric coil to accurately position and fix each electric coil with respect to the iron core.

Next, the width in the x direction is equal to the magnetic pole end width between the slots (x direction), the width in the y direction is y1 + y6, and the height in the z direction is from the upper and lower surfaces of the third iron cores L2, L3. Ferrite rectangular parallelepiped fourth iron cores L4 1 to ₃₈ and L5 1 to ₃₈ , each having a coil protrusion height in the z direction, are inserted between adjacent coils, and a tip end surface thereof is formed of a second iron core L6 and a third iron core L3. Iron core L
In accordance with the slot side tip surfaces of L2 and L3, the third iron core L2,
Join to L3. As described above, the linear motor 3L shown in FIGS. 1 to 5 is assembled. The same applies to the linear motor 3R.

An iron core L2 is fixed to the upper surface of the first iron core L1, an iron core L3 is fixed to the lower surface, and a second iron core L2 is fixed to the rear surface. Height z2 of the iron cores L2 and L3 in the z direction
, And z3 are smaller than the inner diameters in the z direction of the coils CL1 to CL36 mounted on the first iron core L1. By the way, 36 slots are cut in the y-direction tip surfaces (left end surfaces) of the iron cores L2 and L3, like the first iron core L1. The slot pitch of each slot cut into the iron cores L2 and L3, that is, the interval between the slots in the x direction and the width of the slot in the x direction are the same as those of the first iron core L1.
However, the depth of each slot cut in the iron cores L2 and L3, that is, the length in the y direction, is close to the first iron core L1 when the first iron core L1 is fixed to the first iron core L1. Although it is the same as that of No. 1, it becomes longer (deeper) as it moves away from the first iron core L1. That is, the bottom surface of each slot cut into the iron cores L2 and L3 has electric coils CL1 to CL3.
The depth corresponds to the corner of 6 corners.
The third iron cores L2 and L3 are those in which the iron core stacking thickness is increased to the vicinity of the coil angle, which has been impossible in the past due to the corners of the coil corners, and the coil internal space is effectively used. Is.

On the back surface, that is, the right end surface of the first iron core L1, a rectangular parallelepiped iron core L6 is fixed so that the front-rear direction x and the vertical direction z have the same dimensions as the iron core 1L. The iron core L6 is
The first iron core L1 and the iron cores L2 and L3 are laminated iron cores, and the lengths in the front-rear direction x and the vertical direction z are the same as the first iron core L1, but the lengths in the left-right direction y are the first. It is determined in correspondence with the y-direction inner space width yc of the coil mounted on the iron core L1. Here, the length of the iron core L6 in the left-right direction is y
6, the length of the first iron core L1 in the left-right direction y is y1, the length (depth) of the slot cut in the first iron core L1 in the left-right direction y is ys, and is attached to the first iron core L1 Coils CL1 to C
The width of the inner space of L36 in the left-right direction y is yc. From the inner space width yc of each coil, the length y of the first iron core L1 in the left-right direction y
Subtract 1 and let the remaining length be ya (ya = yc-y
1), the length y6 of the iron core L6 in the left-right direction y is smaller than the sum of ya plus the slot depth ys (ya> y6).
This is because when the linear motors 3F and 3L mount the rectangular coils CL1 to CL36 on the first iron core L1,
This is because the first iron core L1 is passed through the air-core portions of the coils CL1 to CL36 and then inserted into each slot, and the inner diameter of the air-core portions of the coils CL1 to CL36 is equal to that of the first iron core L1. At the time of passing through the inner space,
At least the vertical direction z-z and the horizontal direction y of the first iron core L1
Must be larger than the diameter of -y, which
After the coil is completely inserted into each slot of the first iron core L1, in FIG. 6, at least the first iron core L1 is located between the right direction y of the first iron core L1 and the inner side of the left direction y of each coil. This is because the useless air-core part corresponding to the slot depth is left, and the iron core L6 is used for the purpose of effectively filling the useless space with the conductor. That is, the coils CL1 to CL36 are provided in the slots of the first iron core L1.
After mounting the coils, the coils CL1 to CL36 and the first iron core L
By inserting the iron core L6 into the space between the first and the second iron core L1 and fixing the iron core L1 to the uncut right y-side surface of the first iron core L1, the cross-sectional area of the conductor through which the magnetic flux passes increases, and more current flows. It becomes possible to flow. That is, it is possible to obtain a linear motor having a higher output than the conventional one while using an iron core whose outer dimensions are similar to those of the conventional one.

The length of the above-mentioned iron cores L2 and L3 in the left-right direction is the same as the length y1 of the first iron core L1 in the left-right direction and the iron core L6.
The length y6 in the left-right direction y is added. If the iron core L6 is not fixed to the first iron core L1, the lengths of the iron cores L2 and L3 in the left-right direction y are the same as the first iron core L1.

Further, after the coils CL1 to CL36 are already mounted and the first iron core L1, the iron cores L2 and L3 and the iron core L6 are integrally fixed, the upper surface of the iron core L2 and the lower surface of the iron core L3 are The rectangular parallelepiped iron cores L4 1 to ₃₈ and L5 1 to ₃₈ made of ferrite are fixed to each other. Iron core L4
_{1 to 38} and L5 1 to ₃₈ have the same dimensions, the length in the left-right direction y is the same as the iron cores L2 and L3, and the length in the front-rear direction x is
Magnetic pole width between slots cut in L2 and L3 (x direction)
In the present embodiment, the length in the vertical direction z is 80 mm. The iron cores L4 1 to ₃₈ and L5 1 to ₃₈ are located between the adjacent electric coils, and the coils CL1 to CL36 project from the upper and lower surfaces of L2 and L3 in the z direction.
The magnetic flux generated around the is guided to the end face on the slot side.
As a result, the magnetic field applied to the molten metal by the iron core 4L becomes strong.

FIG. 7 shows the phase division of the electric coil shown in FIG. 2, and FIG. 8 shows the connection of all the electric coils shown in FIG. This connection has two poles (N = 2), and three-phase alternating current (M = 3) is applied to the electric coil. For example, the electric coils CF1 to CF36 of the linear motor 3F are w, w, w, w, w, w, V, V, V, V, V, V in this order in FIG.
V, V, u, u, u, u, u, u, W, W, W, W,
W, W, v, v, v, v, v, v, U, U, U, U,
It is represented by U and U. "U" represents the U-phase positive phase energization of the three-phase alternating current (the energization as it is), and "u" represents the U-phase reverse phase energization (the phase shift energization of 180 degrees from the U phase). Means that the U-phase is applied to the winding start end of the winding, whereas the U-phase is applied to the winding end of the electric coil "u". Similarly, "V" is the positive phase energization of the V phase of the three-phase AC, "v" is the negative phase energization of the V phase, and "W".
Represents the positive phase energization of the W phase of three-phase alternating current, and "w" represents the reverse phase energization of the W phase. The terminals U1, V1 and W1 shown in FIG.
Power supply connection terminals for the electric coils CF1 to CF36 of the linear motor 3F, and terminals U2, V2 and W2 are power supply connection terminals for the electric coils CL1 to CL36 of the linear motor 3L.

FIG. 9 shows a power supply circuit V for supplying a three-phase alternating current to the electric coils CF16 to CF36 of the linear motor 3F and the electric coils CL16 to CL36 of the linear motor 3L.
C is shown. A thyristor bridge 12 for DC rectification is connected to the three-phase AC power supply (three-phase power line) 11, and its output (pulsating current) is smoothed by an inductor 13 and a capacitor 14. The smoothed DC voltage is applied to the power transistor bridge 15 for forming the three-phase AC, and the U-phase of the three-phase AC output from the power-transistor bridge 15 is the power supply connection terminal U1 shown in FIG.
1 and U12 have V-phase power supply connection terminals V11 and V
12, and the W phase is applied to the power supply connection terminals W11 and W12.

Each electric coil CF16 of the linear motor 3F
~ CF36 and each electric coil C of linear motor 3L
A predetermined coil voltage command value Vc given to L16 to CL36 is given to the phase angle α calculator 16, and the phase angle α calculator 16 calculates the conduction phase angle α (thyristor trigger-phase angle) corresponding to the command value Vc. Calculate and get the signal that represents this
To the driver 17. The gate driver 17 starts phase counting of the thyristor of each phase from the zero-cross point of each phase, and triggers conduction at the phase angle α. This allows
A direct current voltage indicated by the command value Vc is applied to the transistor bridge 15.

On the other hand, the three-phase signal generator 18 uses the frequency designated by the frequency command value fc (1.8 Hz in this embodiment).
, A constant voltage three-phase AC signal is generated and supplied to the comparator 19. The triangular wave generator 21 also supplies a constant voltage triangular wave having a frequency of 3 kHz to the comparator 19. When the level of the U-phase signal is positive, the comparator 19 outputs the triangular wave generator 18
High level H (transistor on) when the level is higher than the triangular wave level given by, and low level L when the level is lower than the triangular wave level.
The signal of (transistor off) is sent to the positive section of the U phase (0 to 1
80 degrees) (to the U-phase positive voltage output transistor) is output to the gate driver 20, and when the level of the U-phase signal is negative, it is high level when it is below the level of the triangular wave given by the triangular wave generator 21. At H, when the level of the triangular wave is exceeded, the signal of low level L is changed to the negative section of the U phase (180 to 36
The signal is output to the gate driver 20 (to the 0 degree) (to the U-phase negative voltage output transistor). The same applies to the V-phase signal and the W-phase signal. The gate driver 20 turns on and off each transistor of the transistor bridge 15 in response to the signals addressed to these phases, positive and negative sections.

As a result, the U-phase voltage of three-phase AC is output to the power supply connection terminal U1, the V-phase voltage of three-phase AC is output to the power supply connection terminal V1, and the W-phase of three-phase AC is output to the power supply connection terminal W1. Phase voltages are output, the levels of these voltages are determined by the coil voltage command value Vc, and the frequency of the three-phase voltage is 1.8 Hz according to the frequency command value fc in this embodiment. That is, the 1.8 Hz three-phase AC voltage having the voltage value designated by the coil voltage command value Vc is applied to the electric coils CF1 of the linear motors 3F and 3L shown in FIGS.
6 to CF36 and CL16 to CL36.

As described above, in this embodiment, a three-phase alternating current of 20 Hz is applied to the linear motors 3F and 3L having a two-pole structure, and the linear motors 3F and 3L cause the molten steel MM in the inner wall 1 of the mold to be melted. , Thrust in the direction along the inner wall 1 of the mold is applied.

The above-described embodiment is a linear motor, and by adjusting its thrust force to the flow direction of the molten metal itself, the molten metal is accelerated and the thrust force is made opposite to the flow direction of the molten metal itself. The molten metal is decelerated or driven in the reverse direction. When simply applying the braking force, it is sufficient to apply a DC voltage to the electric coils, by selectively applying a DC voltage to one or more of the 36 electric coils in the x direction, or by applying a DC current to each coil. By adjusting the level, a required braking force distribution (x direction) can be obtained.

[0034]

According to the flow control device of the present invention, since the effective cross-sectional area of the iron core is increased, the saturation magnetic flux amount of the iron core is increased, and a larger amount of current can be passed through the electric coil. . Since the outer shape of the device is substantially the same, a strong magnetic field can be applied to the molten metal while maintaining the same outer shape as the conventional device.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of one embodiment of the present invention and a central longitudinal section.

FIG. 2 is an enlarged cross-sectional view of the iron cores 4F and 4L shown in FIG. 1 which is horizontally broken along line 2a-2a.

FIG. 3 is an enlarged sectional view taken along line 3a-3a of FIG.

FIG. 4 is an enlarged cross-sectional view showing the dimensions of each part of the linear motor 3L shown in FIG.

5 is an alternate long and short dash line 5a of the linear motor 3L shown in FIG.
FIG. 5 is a cross-sectional view showing dimensions of a cross section taken along line -5a.

FIG. 6 is an exploded perspective view of the linear motor 3L.

7 is a cross-sectional view corresponding to FIG. 2 showing phase divisions of the electric coil shown in FIG.

FIG. 8 is an electric circuit diagram showing connection of the electric coil shown in FIG.

FIG. 9 is a schematic view showing an electric coil of each linear motor shown in FIG.
It is an electric circuit diagram which shows the structure of the power supply circuit VC which applies a phase alternating voltage.

[Explanation of Codes] 1: Inner wall of mold 2: Water box 3F, 3L: Linear motor PW: Powder MM: Molten steel SB: Cast slab 4F, 4L: Iron core L1, L2, L3, L4, L5, L6: Iron core 5F, 5L: long side 6R, 6L: short side 7F, 7L: copper plate 8R, 8L: copper plate 9F, 9L: non-magnetic stainless plate 10R, 10L: non-magnetic stainless plate CF1-CF36, CL1-CL36: electric coil U1, V1, W1: Power supply connection terminal for iron core 4F U2, V2, W2: Power supply connection terminal for iron core 4L VC: Power supply circuit 22: Pouring nozzle outlet

Claims (5)

[Claims] 1. An iron core having a plurality of slots extending along the molten metal in the x direction and concave in the y direction orthogonal to the x direction and distributed at a predetermined pitch in the x direction, and the iron core penetrates the iron core. In a molten metal flow control device having a plurality of electric coils each side of which is fitted in each slot, the depth of the slots in the y direction is defined as ys, and the iron core of the electric coil penetrates. When the width of the space in the y direction is yc, the iron core has the slot and the width y1 in the y direction is ys.
<Y1 <yc and the first iron core (L1) and the back surface facing the slotted surface of the first iron core (L1) are brought into contact with the back surface and extend in the x direction so that the width y6 in the y direction is yc-y1 < y6 <yc- (y1
-Ys) having a second iron core (L6),
Molten metal flow control device. 2. An iron core having a plurality of slots extending along the molten metal in the x direction and concave in the y direction orthogonal to the x direction and distributed at a predetermined pitch in the x direction, and the iron core penetrates through the iron core. In a molten metal flow control device having a plurality of electric coils, one side of which is fitted in each slot, the depth of the slots in the y direction is defined as ys, and the width of the inner space of the electric coil in the y direction, Assuming that the height in the z direction and the width in the diagonal direction are yc, zc, and yzc, respectively, the iron core has the slot and the width y1 in the y direction is ys.
<Y1 <yc, the height z1 in the z direction is z1 <zc
The iron core (L1) and the back surface facing the slotted surface of the first iron core (L1) are contacted with each other and extend in the x direction so that the width y6 in the y direction is yc-y1 <y6 <yc- (y1- ys), a second iron core (L6) whose height in the z direction is z1, and a height z2 + z3 which abuts on the upper surface or the lower surface of the first iron core (L1) in the z direction and z1 + z2 + z3 <zc. It has a slot aligned with the slot of the core (L1) and fitted with the electric coil, and has a width (y
1 + y6) is larger than yc and smaller than yzc Third iron core (L
2, L3), and a molten metal flow control device. 3. The third iron core (L2, L3) is first in the z direction.
An iron core (L2) of height z2 joined to the upper surface of the iron core (L1) and an iron core of height z3 (L3) joined to the lower surface of the first iron core (L1) in the z direction.
The molten metal flow control device according to claim 2, comprising: 4. The upper surface and the lower surface of the iron core are contacted, and the front end surface is substantially the same surface as the slotted surface of the iron core,
The plurality of fourth iron cores (L4, L5) interposed between the sides orthogonal to the sides fitted in the slots of the electric coils adjacent to each other in the x direction, respectively. Alternatively, the molten metal flow control device according to claim 3. 5. The molten metal flow control device according to claim 1 or 2, wherein the second iron core (L6) is formed by laminating steel plates in an xy plane in the z direction.