The Research Of Electromagnetic Stirring Technique System

Steel remains to be the irreplaceable material used in the development of human society, due to its excellent performance and reclaimable property. In the past20years, Chinese steel industry has made great progress.Continuous casting technology obtains remarkable progresses. But in the solidification process of continuous casting strand, columnar crystal is developed due to fast cooling rate,likely to cause the phenomenon of bridging,resulting in the defects such as porosity,segregation,looseness, inclusion conglomeration in the slab. To resolve the above problems, electromagnetic stirring technique (EMS) was invented accordingly. The application of EMS device is not only favorable for improving the solidification structure of the casting strand,but is also an effective measure to improve the strand surface quality.The paper first introduces the history and trend of EMS,and analyzes the development direction. Then detailes analysis and description all the important part of electromagnetic stirring system,including EMS, low voltage frequency converter, cooling water systema and so on. The paper shows the main circuit,control board and driver board of low voltage frequency converter,and detailes description of the main functions of hardware circuit.followed by paper analyzes the main flow chart and software flow chart of each function,and analysis how to achieve PWM algorithm basic on the rule sampling method.For a complete system, the communication is very important.In this design,the Profibus-DP communication was used, this paper gives the Profibus-DP communication protocol, and realizes such communication used TMS320F2812chip.Based on the application, in the thesis,the actual waveforms of low voltage frequency converter and renderings of EMS was given. Obviously, it has a significant effect in weakening the defects such as porosity, segregation, looseness, inclusion conglomeration in the slab.