| In an induction melting furnace,magnetizers are placed outside the coil region regularly,which prevents leakage of magnetic flux,therefore,increases the induction melting efficiency of the furnace.In this paper,based on the numerical simulation of induction heating,study the superposition structure magnetizer resistivity method,analyzes the material permeability linearization of nonlinear set problem solving,induction heating is established the three dimensional harmonic analysis of the magnetizer of magnetic field / temperature field optimization method,reveals the geometric parameters of magnetizer and structure layout of regional magnetic field induction melting furnace workpiece and the influence law of temperature field.The main research contents of this paper are as follows:(1)According to the material characteristics of the magneticzer and the skin effect principle of the electromagnetic field,the processing method of the superposition characteristics of the magneticzer and the determination method of the resistivity of magneticzer in the simulation study of harmonic magnetic field are established.It is found that a certain multiple amplification of the silicon steel sheet resistivity of magneticzer can not only reflect the eddy current suppression effect of the stacked guidance magnet,but also reflect the skin effect of magneticzer,and at the same time.This method solves the accuracy requirement of magnetic field simulation using integral magnetizer instead of multi-layer insulated superposition magnetizer.(2)Due to the solving characteristics of different types of ANSYS elements,and with the help of the nonlinear solving unit of two-dimensional harmonic magnetic field,the appropriate relative permeability of the magnetizer was determined,and the solving method of linear analysis of the nonlinear material magnetizer in the three-dimensional harmonic magnetic field was proposed.(3)Through the simulation characteristics of 2D harmonic magnetic field/ temperature field,the influence rules of height,thickness and structure layout of the magneticzer on the magnetic flux intensity in the charging air field are revealed,and the temperature distribution characteristics of the workpiece after the optimization of the parameters of the magneticzer are studied.The results indicate that magnetizer height has the strongest influence on the magnetic field distribution formed at the induction coil end.A skin effect and a vector vortex due to magnetic induction were formed at the left and the right sides of the magnetizers,respectively,while a non-magnetized zone was formed in the middle part of the coil.Changing the structure layout of the end of the magneticzer can effectively weaken the magnetic field dissipation at the end of coil and greatly improve the magnetic flux intensity at the end of furnace burden.Optimize the structure of the magnetizer,reduce the height of the magnetizer to the coil,and appropriately reduce the thickness of the magnetizer,without affecting the temperature distribution and heating effect of the cylindrical workpiece in the furnace.(4)Through 3D harmonic simulation analysis,the magnetic field distribution characteristics of the air in the furnace burden field between adjacent magneticzers are studied,and the effect law of the circumferential distribution of magneticzers on the magnetic flux intensity in the charging area is analyzed,and the temperature distribution characteristics of annular workpiece under 3D magneto-thermal coupling are discussed.It is found that increased ratio along the circumferential direction of magnetizer improved the magnetic flux intensity in the material field located in the magnetizer gaps,while at the same ratio,increasing the number of magnetizers helped significantly in terms of improving magnetic flux intensity.According to the relevant optimization scheme,the actual production is verified,and good results are achieved.The results show that the numerical simulation of magnetic field / temperature field in induction smelting furnace with magneticzer structure is solved by the resistivity processing method of stacked structure magneticzer and the solution setting of linearization of nonlinear material magnetic permeability.The effect of the geometrical parameters and structure layout of the magneticzer outside the induction furnace on the magnetic field / temperature field has important theoretical guiding significance for the design and manufacture of induction furnace. |
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