When choosing the right formulation to be implemented in FEA special mathematical handling is required in order to avoid unphysical solutions and to provide numerical stability and computational effi ciency. There are various variational electromagnetic fi eld formulations using FEA to numerically solve Maxwells equations. Only scalar potential is employed Numerical stability because no gauging is required to obtain Model a source component and induced eddy current Computationally effi cient because in the nonconducting region, There are several advantages of this formulation: Avoid unphysical solution due to utilization of edge elements to Numerical solution of such equations is based on T- formulation in which is nodal-based magnetic scalar potential, defi ned in the entire solution domain, and T is edge-based electrical vector potential, defi ned only in the conducting eddy-current region (Figure 1).
Obviously, these equations are considered together with the constitutive material equations for both electric fi elds as E=f (J) and magnetic fi eld as B=f (H). In which E is the electric fi eld strength, B is the magnetic fl ux density, H is the magnetic fi eld strength, and J is the electric current density. ANSYS Maxwell magnetic fi eld formulation is founded on Maxwells equations starting with the basic fi eld equations:
