COMSOL vs Ansys Maxwell for WPT coils.

Ansys Maxwell, part of Synopsys since the July 2025 acquisition of Ansys, is a dedicated low-frequency electromagnetics solver. It solves magnetostatic, eddy-current and transient problems in 2D, axisymmetric and 3D, and its signature feature is automatic adaptive meshing: it refines the mesh pass by pass until inductance and energy converge.

COMSOL Multiphysics is a general finite element platform. For coils you add the AC/DC Module, which brings magnetic field interfaces, homogenised multi-turn coil features and inductance matrix extraction. Its strength is that any physics can share one model: one geometry can carry heat transfer, structural mechanics or your own equations. You get more control, and more responsibility for meshing choices.

For a production charger, both model ferrite tiles with nonlinear B-H curves, aluminium shield plates, eddy-current loss and coil resistance at frequency. The difference is how far beyond electromagnetics you go. If the question is how hot the receiver pad runs, or how a shield deforms, COMSOL keeps it in one model. Maxwell hands those studies to other Ansys tools.

Circuits split the same way. Maxwell users typically pair it with Twin Builder (formerly Simplorer), coupling the field model or a reduced-order model to the inverter and compensation network to check switching behaviour and efficiency. COMSOL embeds its Electrical Circuit interface in the field model, which keeps a series-series resonant tank inside one file; Twin Builder offers the fuller system-simulation environment for switching converters.

Maxwell automation now runs through PyAEDT, an open-source Python library for Ansys Electronics Desktop, alongside the long-standing built-in IronPython scripting. COMSOL offers the COMSOL API for Java, LiveLink for MATLAB, and the Application Builder for turning a model into a simple app colleagues can run with set inputs.

Both added AI assistants. Ansys Engineering Copilot arrived in Maxwell with 2025 R2. COMSOL introduced a Chatbot window in version 6.3 that generates and debugs API code; it runs on Windows and needs your own API key for a supported language model.

Both are commercial, quote-based licences. Ansys Electronics Desktop Student, which includes Maxwell, is a free download for educational use with mesh limits; COMSOL has no equivalent free student edition. For each tool in depth, see our COMSOL alternative and Ansys Maxwell alternative pages.

Every new turn count or radius in a FEM model means remeshing. AirInduct Sim does the step before that. It computes the field with closed-form Biot–Savart and coupling with the Neumann integral, so an air-core coil pair solves in seconds from one of eight topology presets, with L, M and k on every run.

Use it to sweep gap and misalignment, run the genetic optimizer, and export the winner as DXF for import into COMSOL or Maxwell, where you add ferrite and shielding. It does not model those materials, so it does not replace either suite for sign-off. It is free to start: the free plan covers the Helmholtz topology with 3 simulations a month, and AirInduct Pro unlocks every topology, the AI Copilot and unlimited runs (see pricing). Check the validation cases first, or compare all eight tools in the best WPT simulation software.