Numerical Simulation of Electromagnetic Field in Round Bloom Continuous Casting with Final Electromagnetic Stirring

A 3D mathematical model was developed to simulate the electromagnetic field in Φ600 mm round bloom continuous casting with final electromagnetic stirring (F-EMS), and the model was verified using measured data for the magnetic flux density in the stirrer centre. The distribution of electromagnetic force and the influence of current intensity and frequency were investigated. The results show that the Joule heat generated by F-EMS is very small and its influence on secondary cooling heat transfer in the stirring zone can be ignored. With an increase in current frequency, the electromagnetic force density at R/2 and R/3 of the Φ600 mm round bloom first increases and then decreases, reaching a maximum at 10 Hz.

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The Simulation and Optimization of an Electromagnetic Field in a Vertical Continuous Casting Mold for a Large Bloom

Metals ◽

10.3390/met10040516 ◽

2020 ◽

Vol 10 (4) ◽

pp. 516

Author(s):

Lianwang Zhang ◽

Changjun Xu ◽

Jiazheng Zhang ◽

Tao Wang ◽

Jing Li ◽

...

Keyword(s):

Magnetic Field ◽

Continuous Casting ◽

Electromagnetic Force ◽

Three Dimensional ◽

Electromagnetic Stirring ◽

Current Intensity ◽

Continuous Casting Mold ◽

Current Frequency ◽

Simulation And Optimization ◽

Electromagnetic Model

The electromagnetic model of a large-bloom continuous casting was established to simulate the magnetic field. The model 3600 digital, high-precision, three-dimensional Gaussian meter was used to measure the internal magnetic field of mold electromagnetic stirring (M-EMS). The distribution of simulated magnetic field was basically consistent with that of the measured magnetic field; the accuracy of electromagnetic stirring model was verified. With the increase of current frequency, the electromagnetic force first increases and then decreases; when the current frequency is 9 Hz, the electromagnetic force reaches its maximum value. A bipolar electromagnetic stirring model is proposed; the influence of current intensity and distance were investigated. With the increase of current intensity of lower mold electromagnetic stirring (M-EMSB), the internal magnetic intensity of upper mold electromagnetic stirring (M-EMSA) gradually increases, and the middle region is gradually filled by magnetic field. With the increase of the distance, the range of the low-intensity magnetic field expands. When the current intensity of the M-EMSB is 320 A, and the distance is 400 mm, an 8 mT uniform magnetic field in the range of 1.2 m is formed. Compared with the traditional continuous casting electromagnetic agitator, the center equiaxial crystal of bipolar electromagnetic agitator increases from 30.3% to 49.5%.

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Coordinated Optimal Control of Secondary Cooling and Final Electromagnetic Stirring for Continuous Casting Billets

Journal of Control Science and Engineering ◽

10.1155/2020/6502028 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9

Author(s):

Dongsheng Wu ◽

Zhenping Ji ◽

Jian Yang ◽

Hongwei Gao ◽

Jiahui Yu ◽

...

Keyword(s):

Optimal Control ◽

Particle Swarm Optimization ◽

Continuous Casting ◽

Particle Swarm ◽

Electromagnetic Stirring ◽

Internal Quality ◽

Secondary Cooling ◽

Swarm Optimization ◽

Multiobjective Particle Swarm Optimization ◽

Final Electromagnetic Stirring

Secondary cooling and final electromagnetic stirring (F-EMS) are both key technologies for continuous casting. These parameters are usually optimized and controlled separately which caused internal quality fluctuations in unsteady conditions. In this paper, a coordinated optimal control strategy based on a multiobjective particle swarm optimization (MOPSO) algorithm is proposed for the parameter optimization of secondary cooling and F-EMS, which is solved based on multiobjective particle swarm optimization (MOPSO) algorithm. The solidification and heat transfer model are developed for the computation of billet temperature and the solidification, and the adaptive grid method is used to improve the diversity and robustness of optimal solutions. The secondary cooling water and F-EMS’ stirring current are dynamically controlled based on the optimization results. The results of field trials showed that the maximum carbon segregation and other quality indexes of billets can be improved significantly.

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Numerical Simulation of Distribution Characteristics of Electromagnetic Field for Round Billet with Mold Electromagnetic Stirring

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1095.927 ◽

2015 ◽

Vol 1095 ◽

pp. 927-933

Author(s):

Xing Li ◽

Zhou Hua Jiang

Keyword(s):

Electromagnetic Field ◽

Magnetic Flux ◽

Flux Density ◽

Three Dimensional ◽

Electromagnetic Stirring ◽

Magnetic Flux Density ◽

Ansys Software ◽

Current Frequency ◽

Round Billet ◽

Circle Center

A three-dimensional mathematical model of mold electromagnetic stirring (M-EMS) for round billet was established. Based on Maxwell’s equations, the distribution of electromagnetic field was solved by ANSYS software. Different process parameters’ influence on magnetic flux density and electromagnetic force (EMF) was studied. The results show that the magnetic flux density reaches the maximum at the stirrer center in the axis direction and increases with the increasing distance from the circle center on the cross section of the stirrer center. The tangential EMF is symmetric about the circle center and reaches the maximum at the edge of round billet. Both the magnetic flux density and the tangential EMF increase with the increasing current intensity. With the increasing current frequency, the magnetic flux density decreases, while the tangential EMF increases in the applied range of current frequency for M-EMS.

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Analysis of Vibration Caused by Electromagnetic Force on Stator End-Winding of Large Dry Submersible Motor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.416-417.428 ◽

2013 ◽

Vol 416-417 ◽

pp. 428-432

Author(s):

Li Shan ◽

Xiao Wei Cheng ◽

Yong Fang ◽

Xiao Hua Bao

Keyword(s):

Electromagnetic Field ◽

Steady State ◽

Transition State ◽

Electromagnetic Force ◽

Radial Displacement ◽

Radial Direction ◽

Axial Direction ◽

Axial Displacement ◽

Force Density ◽

Submersible Motor

This paper investigates the vibration which caused by electromagnetic on the stator end-winding of the large dry submersible motor. Firstly, the electromagnetic field which included transition state and steady state is researched by 3-D FEM. Secondly, the electromagnetic force which lead to vibrations of end-winding is calculated by numerical method, it can be obtained that where endured the largest force density along the slant part of end-winding. Finally, the radial displacement and the axial displacement of the slant part which caused by vibrations is studied, the analysis results show that the axial displacement is larger than the amplitude of radial displacement. It indicates that the slant part of end-winding will be more easily damaged at axial direction than radial direction.

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