铝电磁铸轧原理及其复合磁场电源控制系统

Principle of aluminum electromagnetic roll-casting and its complex magnetic field power control system

针对目前铝电磁铸轧过程中存在的电磁场控制不稳定、铸轧带坯产品晶粒粗大等问题，分析铝电磁铸轧的工作原理和电磁力主要参数对铝板质量的影响；基于电磁力的特性主要取决于控制系统电流的特性，采用模糊自适应PID算法和在线查表的方法，设计一个适用于控制对象的特殊波形发生器，构建复合磁场电源控制系统，以便对智能变频器的电流进行控制。研究结果表明：此磁场电源控制系统能很好地控制电磁力的主要参数，使电流频率的作用范围为10～15Hz，电流为10～24A，换相周期数为1～5，谐波分量可以按实际要求进行调整；生产出的铝板组织均匀，品粒度达到1级水平，系统运行稳定，控制精度高，动态性能好。

To solve the problems such as unsteadiness of the electro-magnetic field control system and grain coarse in roll-casting sheet, the working principle of aluminum electromagnetic roll-casting was analyzed. Based on the fact that product quality of the electromagnetic parameters was designed by the control system＇s current, a specific waveform generator for the control object was designed on the foundation of fuzzy adaptive PID algorithm, and a complex magnetic field power supply control system was also built to control the current of variable frequency power. The results show that the main electromagnetic parameters can be controlled perfectly by this magnetic field power control system, make the action sphere of the frequency in 10-15 Hz, current in 10-24 A, the number of commutation cycle in 1-5, and harmonic component can be adjusted according to the reality needs. The aluminum plate has homogeneous microstructure and grain size reaches the first-class level. The system is stable with high control precision and good dynamic performance.