CN109909467B - Layered coil crystallizer electromagnetic stirrer - Google Patents
Layered coil crystallizer electromagnetic stirrer Download PDFInfo
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Abstract
The application provides a layered coil crystallizer electromagnetic stirrer, includes: the magnetic field generating device comprises an annular yoke iron, M inner layer rotating magnetic field generating devices and M outer layer rotating magnetic field generating devices; the annular yoke iron annularly surrounds the outer wall of the crystallizer, and M inner-layer rotating magnetic field generating devices and M outer-layer rotating magnetic field generating devices are arranged between the inner wall of the annular yoke iron and the outer wall of the crystallizer; 3M rotating magnetic field iron cores are arranged between the inner wall of the annular yoke and the outer wall of the crystallizer, and are jointly used by an inner rotating magnetic field generating device and an outer rotating magnetic field generating device, each inner rotating magnetic field generating device comprises an inner rotating magnetic field coil and a group of inner rotating magnetic field iron cores, and each outer rotating magnetic field generating device comprises an outer rotating magnetic field coil and a group of outer rotating magnetic field iron cores. The invention strengthens the internal flow of the crystallizer, ensures that the components of the molten steel are more uniformly distributed in the crystallizer, reduces the content of inclusions in the casting blank and improves the quality of the casting blank.
Description
Technical Field
The invention belongs to the technical field of steel continuous casting equipment, and particularly relates to a layered coil crystallizer electromagnetic stirrer.
Background
With the rapid development of modern industry, the quality requirements of various industries on steel products are higher and higher, so that the electromagnetic stirring technology is widely applied to continuous casting production, and the electromagnetic stirrer becomes an essential link for efficient continuous casting to obtain high-quality casting blanks at present.
The essence of electromagnetic stirring is that the movement of molten steel in the liquid cavity is strengthened by means of electromagnetic force induced in the liquid cavity of the casting blank, so that the convection, heat transfer and mass transfer processes of the molten steel are strengthened, thermodynamic and kinetic conditions for inhibiting the development of columnar crystals, promoting the uniformity of components, floating and refining impurities and uniform distribution are generated, and the quality of the casting blank is improved.
Many design studies on continuous casting production of casting blanks exist, but the design studies have the following side points: a movable coil is arranged to realize multi-region stirring; a liquid stabilizer is arranged for stabilizing meniscus fluctuation and the like. In the continuous casting production process of a bloom, a flow dead zone exists at the corner of the bloom, defects are easily generated, the outflow velocity of a submerged nozzle is too high, the initial solidified shell of a casting blank is impacted, floating of inclusions is hindered, and the quality of the casting blank is seriously influenced.
At present, most of crystallizer electromagnetic stirrers in industrial continuous casting production are conventional electromagnetic stirrers, and a rotating magnetic field generated by the conventional electromagnetic stirrers transversely stirs molten steel, so that the temperature distribution of the molten steel in a crystallizer is more uniform, the equiaxial crystal rate is increased, and segregation is reduced.
Disclosure of Invention
The layered coil crystallizer electromagnetic stirrer is adopted, the number of coil layers is at least two, so that an ideal stirring effect is achieved, a magnetic field generated by the two layers of coils interacts with steel to generate rotating electromagnetic force, molten steel in the crystallizer is stirred together, the content of inclusions in a casting blank is improved on the premise of ensuring the casting blank segregation standard, and the cleanliness of the molten steel is improved.
In order to guarantee that the isometric crystal rate of casting blank and the defect of lighter segregation degree improvement square billet bight simultaneously, obtain high-quality steel billet, better outstanding crystallizer electromagnetic agitator's effect, this application has provided a layered coil crystallizer electromagnetic agitator, utilizes the better stirring molten steel of superimposed rotating magnetic field, obtains high-quality steel billet, and its concrete structure includes: the magnetic field generating device comprises an annular yoke, M inner-layer rotating magnetic field generating devices and M outer-layer rotating magnetic field generating devices, wherein M is a positive integer multiple of 3, and the specific value of M can be selected according to actual production needs; the annular yoke iron is positioned outside the crystallizer, a spacing distance is reserved between the annular yoke iron and the outer wall of the crystallizer, and M inner-layer rotating magnetic field generating devices and M outer-layer rotating magnetic field generating devices are circumferentially arranged between the inner wall of the annular yoke iron and the outer wall of the crystallizer; 3M rotating magnetic field iron cores are arranged between the inner wall of the annular yoke and the outer wall of the crystallizer and are uniformly distributed between the inner wall of the annular yoke and the outer wall of the crystallizer, each rotating magnetic field iron core is of a cuboid structure, the rotating magnetic field iron cores and the annular yoke are equal in height, the front surface of each rotating magnetic field iron core faces the crystallizer, a gap exists between the front surface of each rotating magnetic field iron core and the outer wall of the crystallizer, and the back surface of each rotating magnetic field iron core is installed on the inner wall of the annular yoke; the 3M rotating magnetic field iron cores are jointly used by the inner rotating magnetic field generating device and the outer rotating magnetic field generating device, the 3M rotating magnetic field iron cores are defined into two layers according to the length direction, every three adjacent rotating magnetic field iron core parts of the 3M rotating magnetic field iron cores close to the inner wall of the annular yoke are divided into one group, and the three groups are called as inner rotating magnetic field iron cores; every three adjacent 3M rotating magnetic field iron core parts close to the outer wall of the crystallizer are divided into three groups called outer rotating magnetic field iron cores, and each group of inner rotating magnetic field iron cores and outer rotating magnetic field iron cores cannot be completely the same; each inner-layer rotating magnetic field generating device comprises an inner-layer rotating magnetic field coil and a group of inner-layer rotating magnetic field iron cores, wherein the inner-layer rotating magnetic field coil is wound on the side surfaces, the tops and the bottoms of the three rotating magnetic field iron cores in the inner-layer rotating magnetic field iron cores in a mode of crossing in a direction parallel to the flowing direction of molten steel in the continuous casting crystallizer; each outer layer rotating magnetic field generating device comprises an outer layer rotating magnetic field coil and a group of outer layer rotating magnetic field iron cores, and the outer layer rotating magnetic field coil is wound on the side surfaces, the top and the bottom of the three rotating magnetic field iron cores in the outer layer rotating magnetic field iron cores in a mode of crossing in a direction parallel to the flowing direction of molten steel outside the continuous casting crystallizer.
Preferably, a gap is provided between the inner rotating magnetic field coil and an inner wall of the annular yoke, and a gap is also provided between the inner rotating magnetic field coil and the outer rotating magnetic field coil.
Preferably, each rotating magnetic field iron core is a silicon steel magnetic core and is formed by laminating silicon steel sheets.
Preferably, M is equal to 3, three-phase alternating current is introduced into both the inner layer rotating magnetic field generating device and the outer layer rotating magnetic field generating device, and a magnetic field region from an N pole to an S pole is formed in the crystallizer region.
Preferably, the current intensity and the frequency of the introduced three-phase alternating current are variable.
Preferably, the three-phase alternating currents introduced into the inner rotating magnetic field coils and the outer rotating magnetic field coils are the same, the phase difference of each phase introduced into the three-phase alternating currents by the three groups of inner rotating magnetic field coils is 120 °, the phase difference of each phase introduced into the three groups of outer rotating magnetic field coils is 120 °, and the phases of the currents in the inner coils and the outer coils of the two common rotating magnetic field cores are correspondingly the same.
The application has the advantages that:
1. the invention adopts a layered coil electromagnetic stirring system, both two layers of coils generate rotating magnetic fields, the superposition of the magnetic fields strengthens the flow in the square billet, and the molten steel in the crystallizer is stirred more fully, so that the components in the molten steel are distributed more uniformly in the crystallizer, the possibility of the defects of segregation and the like is reduced, and the columnar crystal branches formed firstly are broken continuously under the action of electromagnetic force, and the equiaxial crystal rate is increased.
2. The current with different frequencies and intensities can be selected according to the requirements of different steel grades, the number of layers of the rotating magnetic field coil is increased or decreased, and the electrifying time is changed so as to adapt to different requirements of various steels on the stirring intensity.
Drawings
FIG. 1 is a cross-sectional front view of the present invention;
FIG. 2 is a cross-sectional left side view of the present invention;
FIG. 3 is a cross-sectional top view of the present invention;
FIG. 4 is a front elevational view of a layered coil crystallizer electromagnetic stirrer without a crystallizer and molten steel;
FIG. 5 is a front elevational view of a layered coil mold electromagnetic stirrer containing a mold and molten steel;
FIG. 6 is a top view of a layered coil crystallizer electromagnetic stirrer;
FIG. 7 is a schematic diagram showing the position of the magnetic field generation region of the layered coil mold electromagnetic stirrer;
FIG. 8 is a top view of a conventional crystallizer electromagnetic stirrer;
FIG. 9A illustrates the magnetic field at the center cross-section of a conventional electromagnetic stirrer;
FIG. 9B center cross-sectional magnetic field of a layered coil electromagnetic stirrer;
FIG. 10A shows the magnetic field at the outlet cross-section of a conventional electromagnetic stirrer;
FIG. 10B illustrates the magnetic field at the exit cross-section of a layered coil electromagnetic stirrer;
FIG. 11A illustrates a central cross-sectional electromagnetic force of a conventional electromagnetic stirrer;
FIG. 11B center cross-section electromagnetic force of a layered coil electromagnetic stirrer;
FIG. 12A illustrates the outlet cross section electromagnetic force of a conventional electromagnetic stirrer; and
FIG. 12B layered coil electromagnetic stirrer exit cross section electromagnetic force;
description of reference numerals:
1 annular yoke 2 inner layer rotating magnetic field generating device 3 outer layer rotating magnetic field generating device
4 inner layer rotating magnetic field coil 5 outer layer rotating magnetic field coil
8 continuous casting crystallizer 9 molten steel
10 rotating magnetic field generating region 11 rotating magnetic field iron core
Detailed Description
At present, a rotating magnetic field is generated by a crystallizer electromagnetic stirrer generally adopted in the industry, and the essence of electromagnetic stirring is that the movement of molten steel in a liquid cavity is strengthened by means of electromagnetic force induced by an electromagnetic field in the liquid cavity of a casting blank, so that the convection, heat transfer and mass transfer processes of the molten steel are strengthened, thermodynamic and kinetic conditions for inhibiting the development of columnar crystals, promoting the uniformity of components, floating and refining inclusions and uniform distribution are generated, the solidification structure of the casting blank is further controlled, and the quality of the casting blank is improved. But the electromagnetic force that conventional rotating field produced still can not be fine stirs square billet bight, and the present application adopts layered coil crystallizer electromagnetic stirrer, utilizes superimposed magnetic field to play the stirring effect to the molten steel in the crystallizer, improves square billet bight problem, provides the guarantee for producing high quality steel billet.
The layered coil crystallizer electromagnetic stirrer comprises an annular yoke 1, M inner layer rotating magnetic field generating devices 2 and M outer layer rotating magnetic field generating devices 3, wherein M is equal to a positive integer multiple of 3, namely M is a positive integer and is a multiple of 3. In the present embodiment, M is equal to 3, i.e., there are 3 inner-layer rotating magnetic field generating devices 2 and 3 outer-layer rotating magnetic field generating devices 3, as shown in fig. 1 to 6.
The annular yoke iron 1 is positioned outside the crystallizer, a certain distance is arranged between the annular yoke iron 1 and the outer wall of the crystallizer in an annular mode, and an inner layer rotating magnetic field generating device 2 and an outer layer rotating magnetic field generating device 3 are circumferentially arranged between the inner wall of the annular yoke iron 1 and the outer wall of the crystallizer.
In this embodiment, there are nine rotating field cores 11 between annular yoke 1 inner wall and crystallizer outer wall, evenly distributed is between annular yoke 1 inner wall and crystallizer outer wall, every rotating field core 11 all is the cuboid structure, it forms to fold by the silicon steel sheet, it is parallel with annular yoke 1 inner wall to fold the system direction, silicon steel has the highest saturation magnetic induction intensity (more than 2.0T) among the commonly used soft magnetic material, it has better magnetic permeability to adopt the silicon steel sheet as rotating field core 11, can reduce the hysteresis loss, and because the resistivity of stator can be strengthened in the joining of silicon element, reduce the eddy current loss of winding stator, greatly reduced because the heat that the loss produced, be favorable to the heat dissipation of crystallizer electromagnetic agitator. The rotating magnetic field iron core 11 and the annular yoke 1 are equal in height, the front surface of the rotating magnetic field iron core 11 faces the crystallizer and is not in contact with the crystallizer, namely, the front surface of the rotating magnetic field iron core 11 has a certain distance from the crystallizer, and the back surface of the rotating magnetic field iron core 11 is installed on the inner wall of the annular yoke 1.
The nine rotating magnetic field cores 11 are shared by the inner rotating magnetic field generating device 2 and the outer rotating magnetic field generating device 3, so for the convenience of distinguishing and describing, the nine rotating magnetic field cores 11 are divided into two layers according to the length direction, but are still integrated in the structure, and the nine rotating magnetic field cores 11 close to the inner wall of the annular yoke 1 are divided into a group of every three adjacent magnetic field cores, and the three groups are called as inner rotating magnetic field cores; nine rotating magnetic field iron cores 11 close to the outer wall of the crystallizer are divided into three groups, namely an outer layer rotating magnetic field iron core. The inner rotating magnetic field iron core and the outer rotating magnetic field iron core of each group are required to be not identical, and during specific implementation, one rotating magnetic field iron core can be dislocated between each inner rotating magnetic field iron core and each outer rotating magnetic field iron core of each group. A certain distance is arranged between the inner rotating magnetic field coil 4 and the inner wall of the annular yoke 1, a certain distance is also arranged between the inner rotating magnetic field coil 4 and the outer rotating magnetic field coil 5, and the outer rotating magnetic field coil 5 is flush with the end part of the outer rotating magnetic field core or is shorter than the length of the outer rotating magnetic field core. In this embodiment, only two layers of rotating magnetic field coils are included, and the length of the outer layer rotating magnetic field coil 5 is smaller than that of the outer layer rotating magnetic field core.
Each inner rotating magnetic field generating device 2 comprises an inner rotating magnetic field coil 4 and an inner rotating magnetic field core, the inner rotating magnetic field coil 4 is wound on the side, the top and the bottom of three rotating magnetic field cores included in the inner rotating magnetic field core in a direction parallel to the flowing direction of molten steel 9 in the continuous casting crystallizer 8, the opening of the inner coil in fig. 4 and 5 is only used for illustrating an interface for connecting three-phase alternating current, and actually, the inner rotating magnetic field coil 4 is in a closed annular structure. Three-phase alternating current is introduced into the three groups of inner layer rotating magnetic field coils 4, the phase difference of each phase is 120 degrees, alternating current in the coils generates a rotating magnetic field, and the moving molten steel 9 generates induced electromagnetic force under the action of the induced magnetic field, so that the flowing of the molten steel 9 is strengthened, and the temperature distribution of the molten steel 9 is promoted to be uniform.
The outer rotating magnetic field generating device 3 comprises an outer rotating magnetic field coil 5 and an outer rotating magnetic field iron core, the outer rotating magnetic field coil 5 is wound on the side, the top and the bottom of three rotating magnetic field iron cores included in the outer rotating magnetic field iron core in a direction parallel to the flowing direction of molten steel 9 outside the continuous casting crystallizer 8, the opening of the outer coil in fig. 4 and 5 is only an interface for connecting three-phase alternating current, and actually, the outer rotating magnetic field coil 5 is of a closed annular structure. Three-phase alternating current is introduced into the three groups of outer-layer rotating magnetic field coils 5, the phase difference of each phase is 120 degrees, alternating current in the coils generates a rotating magnetic field, and the moving molten steel 9 generates induction electromagnetic force under the action of the induction magnetic field and acts on the volume unit of the molten steel 9 to fully stir the molten steel 9. The calculation method of the three-phase alternating current is as follows:
ia＝I·n·[sin(wt)+icos(wt)]
ib＝I·n·[sin(wt-2π/3)+icos(wt-2π/3)]
ic＝I·n·[sin(wt+2π/3)+icos(wt+2π/3)]
wherein ia、ib、icFor each phase current, I is the current intensity, n is the number of coil turns, t is the time, and w is the angular frequency.
The inner rotating magnetic field coil 4 and the outer rotating magnetic field coil 5 can be selectively supplied with the same three-phase alternating current, the time for supplying the alternating current to each layer of coil can be changed, the frequency and the intensity of the supplied three-phase alternating current can be changed, and meanwhile, the phases of the currents in the inner rotating magnetic field coil 4 and the outer rotating magnetic field coil 5 which share the two rotating magnetic field cores do not need to be correspondingly the same. In the embodiment, alternating current with the same intensity and frequency is introduced into the inner and outer coils, but the time for introducing three-phase alternating current into each layer is changed, simultaneously, the phases of the alternating current in the inner coil and the outer coil of the two common rotating magnetic field iron cores are correspondingly the same, and M is equal to 3, three-phase alternating current is introduced into the three inner layer rotating magnetic field generating devices and the three outer layer magnetic field generating devices, a magnetic field area from an N pole to an S pole is formed in the crystallizer area, after three-phase alternating current is introduced, each group of rotating magnetic field generating devices interact to generate a rotating magnetic field area, the rotating direction of the magnetic field is clockwise or anticlockwise determined by the application position of the three-phase alternating current of each group of rotating magnetic field generating devices, moving molten steel generates rotating induction electromagnetic force under the action of the induction rotating magnetic field to strengthen the flowing of the molten steel, increase the isometric crystal rate and reduce segregation, and the position of the magnetic field generating area of the electromagnetic stirrer relative to the molten steel is shown in figure 7.
To clearly, clearly and completely illustrate the objects, embodiments and advantages of the present invention, a specific example will be given below in conjunction with the accompanying patent drawings, which are a part of the examples of the present invention and do not represent all the examples.
In the embodiment, the size of a steel billet is 325mm × 280mm, the center of the end face of the bottom of a continuous casting crystallizer is taken as the origin of coordinates, the direction of the narrow surface of a casting blank is taken as the x direction, the wide surface of the casting blank is taken as the y direction, the height direction of the continuous casting crystallizer is taken as the z direction, the height of the continuous casting crystallizer is 850mm, the height of molten steel is 800mm, the molten steel is reversely extended by 500mm, the total length is 1300mm, the bottom of a layered coil crystallizer electromagnetic stirrer is flush with the bottom of the continuous casting crystallizer and has the height of 379mm, the widths of an inner rotating magnetic field coil 4 and an outer rotating magnetic field coil 5 are both 40mm, the inner rotating magnetic field core and the outer rotating magnetic field core are both as high as an annular yoke 1.
When the electromagnetic stirrer works, the inner layer rotating magnetic field generating device 2 and the outer layer rotating magnetic field generating device 3 of the layered coil crystallizer electromagnetic stirrer are introduced with the same current intensity and current frequency as those of the traditional crystallizer electromagnetic stirrer, namely three-phase alternating current of 500A and 5Hz is introduced. At the time when t is 0, three-phase alternating current is introduced into the inner coil, the current intensity is 500A, the turns of each coil are 100 turns, the current phase difference is 120 degrees, the frequency is 5Hz, and the outer coil is not electrified; at the moment t is 1, three-phase alternating current is introduced into the outer-layer coil, the current intensity is 500A, the number of turns of each coil is 100, the current phase difference is 120 degrees, and the frequency is 5 Hz. Meanwhile, in this embodiment, the phases of the currents in the inner coil and the outer coil of the two common rotating magnetic field cores are correspondingly the same, that is, the coil with the current of 0 ° in the inner rotating magnetic field generating device 2 corresponds to the coil with the current of 0 ° in the outer rotating magnetic field generating device 3, the two coils share the two rotating magnetic field cores 11, and the rest two phases are analogized. The magnetic field intensity and electromagnetic force distribution of the central cross section and the outlet cross section of the obtained crystallizer are shown in FIGS. 9A, 9B, 10A, 10B, 11A, 11B, 12A and 12B.
As can be seen from fig. 9A, 9B, 10A, 10B, the magnetic field distribution generated by the two stirrers is similar, the magnetic field penetrates into the crystallizer from the side and mainly exits in the diagonal direction, wherein the magnetic field strength of the central cross section of the conventional electromagnetic stirrer is 0.00569-0.06015T, and the magnetic field strength of the outlet cross section is 0.01007-0.07408T; the magnetic field intensity of the central cross section of the layered coil electromagnetic stirrer is 0.01-0.1759T, the magnetic field intensity of the outlet cross section is 0.09-0.25T, and compared with the conventional electromagnetic stirrer, the minimum value of the magnetic field intensity of the central cross section of the embodiment of the application is improved by 0.00431T; as can be seen from FIGS. 11A, 11B, 12A and 12B, the electromagnetic force generated by the two stirrers is similarly distributed and is of a rotary type, wherein the electromagnetic force of the center cross section of the conventional electromagnetic stirrer is 34.9-59748N/m3The electromagnetic force of the cross section of the outlet is 522.55-63748.7N/m3(ii) a The electromagnetic force of the central cross section of the layered coil electromagnetic stirrer is 381.32-4019.82N/m3The electromagnetic force of the cross section of the outlet is 8367.88-107871N/m3The minimum electromagnetic force on the center cross section of the embodiments of the present application is improved by 346.4N/m3. It can be seen from a combination of contour plots, although the present application is directed toThe biggest electromagnetic force that the center cross section produced in the embodiment is less than conventional electromagnetic agitator, but the distribution is more even, and the electromagnetic force that conventional electromagnetic agitator played the main effect still is the minimum, therefore, this application embodiment can produce stronger horizontal stirring effect to the molten steel outside the crystallizer, strengthen the flow of the molten steel outside the crystallizer, promote the dissipation of equiaxial crystal nucleus and overheated, make the thickness of the initial solidification shell more even, simultaneously, because the effect of rotatory electromagnetic force, also make each composition distribution in the molten steel more even, reduced the formation of defects such as segregation and shrinkage cavity, the surface and the subcutaneous quality of casting blank have been improved.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A layered coil crystallizer electromagnetic stirrer is characterized in that: it includes: the magnetic field generating device comprises an annular yoke iron, M inner layer rotating magnetic field generating devices and M outer layer rotating magnetic field generating devices, wherein M is a positive integer multiple of 3;
the annular yoke iron is positioned outside the crystallizer, a spacing distance exists between the annular yoke iron and the outer wall of the crystallizer in an annular mode, and M inner-layer rotating magnetic field generating devices and M outer-layer rotating magnetic field generating devices are circumferentially installed between the inner wall of the annular yoke iron and the outer wall of the crystallizer;
3M rotating magnetic field iron cores are arranged between the inner wall of the annular yoke and the outer wall of the crystallizer and are uniformly distributed between the inner wall of the annular yoke and the outer wall of the crystallizer, each rotating magnetic field iron core is of a cuboid structure, the rotating magnetic field iron cores and the annular yoke are equal in height, the front faces of the rotating magnetic field iron cores face the crystallizer, a gap exists between the front faces of the rotating magnetic field iron cores and the outer wall of the crystallizer, and the back faces of the rotating magnetic field iron cores are installed on the inner wall of the annular yoke;
the 3M rotating magnetic field iron cores are jointly used by the inner rotating magnetic field generating device and the outer rotating magnetic field generating device, the 3M rotating magnetic field iron cores are defined into two layers according to the length direction, every three adjacent rotating magnetic field iron core parts of the 3M rotating magnetic field iron cores close to the inner wall of the annular yoke are divided into one group, and the three groups are called as inner rotating magnetic field iron cores; every three adjacent 3M rotating magnetic field iron core parts close to the outer wall of the crystallizer are divided into three groups called outer rotating magnetic field iron cores, and each group of inner rotating magnetic field iron cores and outer rotating magnetic field iron cores are not completely the same but still structurally form a whole;
each inner-layer rotating magnetic field generating device comprises an inner-layer rotating magnetic field coil and a group of inner-layer rotating magnetic field iron cores, wherein the inner-layer rotating magnetic field coil is wound on the side surfaces, the tops and the bottoms of the three rotating magnetic field iron cores in the inner-layer rotating magnetic field iron cores in a mode of crossing in a direction parallel to the flowing direction of molten steel in the continuous casting crystallizer;
each outer layer rotating magnetic field generating device comprises an outer layer rotating magnetic field coil and a group of outer layer rotating magnetic field iron cores, and the outer layer rotating magnetic field coil is wound on the side surfaces, the top and the bottom of the three rotating magnetic field iron cores in the outer layer rotating magnetic field iron cores in a mode of crossing in a direction parallel to the flowing direction of molten steel outside the continuous casting crystallizer.
2. The layered coil crystallizer electromagnetic stirrer of claim 1, wherein:
and an interval is formed between the inner rotating magnetic field coil and the inner wall of the annular yoke, and an interval is also formed between the inner rotating magnetic field coil and the outer rotating magnetic field coil.
3. The layered coil crystallizer electromagnetic stirrer of claim 1, wherein:
each rotating magnetic field iron core is a silicon steel magnetic core and is formed by laminating silicon steel sheets.
4. The layered coil crystallizer electromagnetic stirrer of claim 1, wherein:
m is equal to 3, three-phase alternating current is introduced into the inner layer rotating magnetic field generating device and the outer layer rotating magnetic field generating device, and a magnetic field area from an N pole to an S pole is formed in the crystallizer area.
5. The layered coil crystallizer electromagnetic stirrer of claim 4, wherein:
the current intensity and the frequency of the introduced three-phase alternating current are variable.
6. The layered coil crystallizer electromagnetic stirrer of claim 4, wherein:
the three-phase alternating current introduced into the inner rotating magnetic field coils and the three-phase alternating current introduced into the outer rotating magnetic field coils are the same, the phase difference of each phase of the three-phase alternating current introduced into the three groups of inner rotating magnetic field coils is 120 degrees, the phase difference of each phase of the three-phase alternating current introduced into the three groups of outer rotating magnetic field coils is 120 degrees, and the phases of currents in the inner coils and the outer coils of the two common rotating magnetic field cores are correspondingly the same.
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|---|---|---|---|---|
| US4321958A (en) * | 1979-01-30 | 1982-03-30 | Cem Compagnie Electro-Mecanique | Electromagnetic inductor for generating a helical field |
| JPH10230349A (en) * | 1997-02-20 | 1998-09-02 | Yaskawa Electric Corp | Electromagnetic stirring device |
| JP3452709B2 (en) * | 1995-11-02 | 2003-09-29 | 新日本製鐵株式会社 | Moving magnetic field generator |
| CN103182495A (en) * | 2011-12-29 | 2013-07-03 | 宝山钢铁股份有限公司 | Multifunctional electromagnetic stirrer |
| CN104759597A (en) * | 2015-04-08 | 2015-07-08 | 东北大学 | Electromagnetic stirrer for continuous casting solidification end and dynamic control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321958A (en) * | 1979-01-30 | 1982-03-30 | Cem Compagnie Electro-Mecanique | Electromagnetic inductor for generating a helical field |
| JP3452709B2 (en) * | 1995-11-02 | 2003-09-29 | 新日本製鐵株式会社 | Moving magnetic field generator |
| JPH10230349A (en) * | 1997-02-20 | 1998-09-02 | Yaskawa Electric Corp | Electromagnetic stirring device |
| CN103182495A (en) * | 2011-12-29 | 2013-07-03 | 宝山钢铁股份有限公司 | Multifunctional electromagnetic stirrer |
| CN104759597A (en) * | 2015-04-08 | 2015-07-08 | 东北大学 | Electromagnetic stirrer for continuous casting solidification end and dynamic control method thereof |
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