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Method and device for modulating electromagnetic stirring and rotating magnetic field based on permanent magnet

A technology of electromagnetic stirring and rotating magnetic field, which is applied in the direction of stirring devices, chemical instruments and methods, mixers, etc., can solve problems such as white and bright bands, influence, slab segregation, etc., and achieve intuitive changes, strong operability, and increase productivity. Effect

Inactive Publication Date: 2010-12-22
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, with the increase of stirring intensity, although it can increase the ratio of equiaxed grains and refine grains, due to the mass transfer effect of molten metal flow, serious segregation occurs in the solidified billet. problem, typically manifested by the generation of "white bands" due to the effect of liquid metal flow on solidification

Method used

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  • Method and device for modulating electromagnetic stirring and rotating magnetic field based on permanent magnet
  • Method and device for modulating electromagnetic stirring and rotating magnetic field based on permanent magnet
  • Method and device for modulating electromagnetic stirring and rotating magnetic field based on permanent magnet

Examples

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Effect test

Embodiment 1

[0017] Embodiment one: see figure 1 , this electromagnetic stirring and electromagnetic stirring rotating magnetic field modulation method based on permanent magnets can generate magnetic induction according to the equation B=B 0 Cos(2πωt+φ) changing magnetic field, where the magnetic field amplitude B 0 The three parameters , magnetic field frequency ω and magnetic field phase φ can be modulated individually or jointly. The stirrer 8 is connected with the programmable stepper motor 4, and the two always keep the same rotation mode, the amplitude B 0 , frequency ω and phase φ modulation are as follows:

[0018] ① adjust the rotational speed of the stepper motor 4 to achieve the purpose of adjusting the magnetic field frequency ω;

[0019] ② Change the direction of rotation of the stepper motor 4 to achieve the purpose of adjusting the magnetic field phase φ;

[0020] ③ By inlaying permanent magnets 6 of different materials, or changing the arrangement of permanent magnets ...

Embodiment 2

[0021] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the special features are as follows: the variation range of the magnetic field frequency ω is 0-100000 Hz; the range of the magnetic field phase φ is 0-360°; the material of the permanent magnet 6 It is one or more of oxide magnets, alloy magnets, neodymium-iron-stilbene magnets, samarium-cobalt magnets, rubber magnets, and plastic magnets. The permanent magnets 6 are arranged in such a way that S poles and N poles are symmetrically distributed on two half circles; The poles and the N poles are alternately arranged in the circumferential direction; the S poles and the N poles are evenly arranged in the axial direction of the two semicircles, one or more of these three arrangements, see image 3 , Figure 4 and Figure 5 .

Embodiment 3

[0022] Embodiment 3: An electromagnetic stirring device based on permanent magnets, using the above-mentioned modulation method to adjust the magnetic field, including an electromagnetic stirrer 8 wrapped outside the crystallizer, the structure of the stirrer 8 is: a plurality of permanent magnets 6 are embedded in a ring In the iron core 7, the annular iron core 7 is connected to the programmable stepping motor 4 through the transmission gear 5, and the annular iron core 7 is driven by the stepping motor 4 to rotate, and the magnetic field of the agitator 8 and the stepping motor 4 are always Keep the rotation the same way.

[0023] working principle

[0024] The stirrer 8 is wrapped around the outer edge of the crystallizer 2, and the generated magnetic field acts on the inner molten metal 3 through the mold 2. The magnetic field changes according to certain rules, and an induced current will be generated in the molten metal 3. Combined with the rotation of the magnetic fiel...

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Abstract

The invention relates to a method and a device for modulating an electromagnetic stirring and rotating magnetic field based on a permanent magnet. In the method, a magnetic field the magnetic induction of which changes in accordance with the following equation of B=B0cos(2*pi*omega*t+phi) can be generated, wherein the magnetic field amplitude B0, the magnetic field frequency omega and the magnetic field phase position phi can be modulated independently or jointly. The device adopts the magnetic field modulation method and structurally comprises a stirrer wrapped on the periphery of a crystallizer, and the internal structure thereof is characterized in that a permanent magnet is inlaid in a toroidal core; the toroidal core is connected with a programmable stepping motor and is driven by the stepping motor to rotate; and the magnetic field generated by the stirrer always keeps the same rotating mode with the stepping motor. The invention can modulate the amplitude, the frequency and the phase position independently or jointly, realize accurately controlling the flow of molten metal so as to further well control the solidification of the molten metal, improve the quality of casting blanks and increase productivity.

Description

technical field [0001] The invention relates to a method and device for modulating a rotating magnetic field, in particular to a permanent magnet-based electromagnetic stirring rotating magnetic field modulation method and device used in metallurgical processes, belonging to the field of electromagnetic preparation of materials. Background technique [0002] Electromagnetic stirring technology is a traditional method that can effectively improve the surface and internal quality of the slab, increase the ratio of equiaxed grains, and refine grains. In the continuous casting process, electromagnetic stirring technology can be used in all areas with liquid cores from the beginning of the crystallizer to the end of the secondary cooling section to the end of solidification to improve the surface and internal quality of the slab, increase the ratio of equiaxed grains, and refine grains the goal of. During the application of this technology, the applied magnetic field is a magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/08B22D11/115F27D27/00
Inventor 雷作胜王冠高齐任忠鸣邓康
Owner SHANGHAI UNIV
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