Three-dimensional Coupled Analysis Of Transverse Flux Induction Heating For Moving Strips

Transverse flux induction heating(TFIH)for continuously moving strip,which has been a hot problem for Eletrical Engineering,Materials Science and Engineering and Metallurgical cross-discipline research worldwide,is involving three-dimensional non-liner coupled problem of eddy current field and temperature field.Mathematical model,which is simplified reasonably,is offerd for solving the coupled problem for TFIH.Eddy current field calculates with A-? formulation,then the basic equations of eddy current field is deduced and boundary conditions are accurately analyzed.For the moving strip,transient temperature equations and boundary conditions are derived.For the coupled problem for TFIH,the large-scale commercial software ANSYS is used to analysize.Firstly,when the strip is static,the Magnetic field distribution,resulted eddy current,and temperature distribution are deduced by analysis of the the coupled problem for TFIH.For the continuously moving strip,static method is applied instead of the moving trip,then the magnetic field distribution,resulted eddy current,and temperature distribution are deduced.For the transverse TFIH with continuously moving strip,it is studied that how them influence the temperature distribution of the trip that which are the air gap between the inductor and the strip,the size of the current and frequency,the inductor structure parameters including the relative width between the inductior and strip and the distance of magnets guide to coil,etc.Finally,to adress the temperature non-uniformity issue in the width direction of the trip at the exit of TFIH,the antuor proposes using multiple sets of inductors with different Magnets guide lengths to compensate the temperature of each other and inductors coils of different shapes.The author adopts the method of orthogonal design to study how different magnets guide lengths of two groups of inductors influence each other and the strip temperature distribution.It finds that adjust the length of the magnet guide groups can improve temperature uniformity of the strip at the exit,and two groups of inductors is better than a single set on the temperature uniformity of the strip.Designing different shapes of coil inductor design,the author bases on under "coil projection laws" to designe a diamond coil b,but it is worse than a rectangular coil on the strip center temperature.So the author designs a polygon coil and proposes "three-stage temperature control law".With a variety of plans designed with the orthogonal method,the antuhor analizes them with ANSYS and gets the optimal parameters of the polygon coil.It shows that the polygon coil is significantly better than rectangular coil for the the temperature distribution in the width direction of the trip at the exit of the TFIH.