Electromagnetic-Thermal Analysis of Wireless Charging

Efficiency and temperature rise of wireless power transfer coils. Resonant type / Non-resonant type.

We use spatial discretization by the Finite Element Method (FEM). We assemble the element stiffness matrices and construct the global stiffness equation.

We perform transformation to the weak form (variational form) and use formulation by the Galerkin method using test functions and shape functions. The choice of element type (low-order elements vs. high-order elements, full integration vs. reduced integration) directly affects the trade-off between solution accuracy and computational cost.

We solve the simultaneous equations using direct methods (LU decomposition, Cholesky decomposition) or iterative methods (CG method, GMRES method). For large-scale problems, preconditioned iterative methods are effective.

Developed by Japan's JSOL Corporation. An electromagnetic field analysis tool specialized for electrical equipment design.

Ansoft Maxwell. Low-frequency electromagnetic field analysis. Integrated into Ansys in 2008.

Founded in Sweden in 1986. Started as FEMLAB with MATLAB integration, later renamed to COMSOL. Strong in multiphysics.

When converting models between different solvers, attention must be paid to the correspondence of element types, compatibility of material models, and differences in the representation of loads/boundary conditions. Especially high-order elements and special elements (cohesive elements, user-defined elements, etc.) often cannot be directly converted between solvers.

Verifying mesh convergence, validating the appropriateness of boundary conditions, and performing sensitivity analysis of material parameters are extremely important.

Yeah, you're doing great! Actually trying things out for yourself is the best way to learn. If you don't understand something, feel free to ask anytime.