Design And Realization Of Multi-coil Electromagnetic Induction Heating Control System

The electromagnetic heating method with distributed multi-coil structure has attracted attention and research because of its good temperature controllability.However,due to the coherence of the multi-coil electromagnetic parameters,the previous control models and algorithms cannot be used.This article will focus on this The problem of research work has made the control model and algorithm under the multi-coil structure improved in terms of control accuracy and adaptability.This paper studies the model and controllability of the multi-coil electromagnetic heating system.The 2*2 multi-coil will be used as the research object.First,based on the understanding of the multi-coil electromagnetic field,the proximity effect and eddy current effect in the multi-coil electromagnetic induction heating process will be analyzed on the heating system;by introducing Cartesian coordinates Analyze and calculate the induced electromotive force model of the total vector of the multi-coil by the method of combining the system and the cylindrical coordinate system.In addition,calculate the temperature field model based on the eddy current and power loss;further analyze and establish the multi-coil electromagnetic heating model,and the series resonance circuit model is connected in parallel The advantages and disadvantages of the resonant circuit model are analyzed,and the series resonant circuit model is finally selected as the main circuit model of the multi-coil electromagnetic heating.Secondly,the main parameters of the driving power supply are analyzed in the Multisim simulation software,the SPWM technology is used as the driving signal and the driving circuit is isolated for reliability analysis,and the signal acquisition circuit,temperature acquisition module and protection circuit are designed;in terms of control strategy Introduce the self-tuning algorithm combining BP neural network and PID,and conduct simulation experiments in Matlab,compare the new control method with the traditional PID algorithm,and obtain the robustness,accuracy and overshoot of the BP-PID control algorithm,Reliability and power consumption are superior to the traditional PID algorithm.Finally,build a multi-coil electromagnetic induction heating experiment platform and conduct comparative experiments.The analysis of the experimental results shows that the distributed multi-coil electromagnetic induction heating is significantly better than the single coil in terms of accuracy,temperature controllability and robustness,which improves the uniformity of the surface temperature of the plate.This also provides a certain reference value for multi-coil electromagnetic induction heating.