For this reason, AlNiCo is sometimes used in permanent magnet (PM) motors where temperatures may be too high for NdBFe magnets. AlNiCo magnets have an advantage over NdBFe magnets at elevated operating temperatures since the Curie temperature for AlNiCo magnets is in the range 700–860☌ as opposed to 310–400☌ for NdBFe magnets. Two important permanent magnet materials are AlNiCo (soft magnet) and NdBFe (hard magnet). A generic example material Demagnetizable Nonlinear Permanent Magnet with the approximate properties of AlNiCo 5 has been added to the AC/DC material database to serve as a template for user-defined materials supporting the new material model. Material Model for Soft Permanent MagnetsĪ new material model for modeling soft permanent magnets has been added to the Magnetic Fields Magnetic Fields, No Currents and Rotating Machinery, Magnetic interfaces. Among other benefits, this makes it much easier to combine electromagnetics with fluid flow in rotating machinery. This facilitates multiphysics modeling in moving domains with greater ease as compared to previous versions. The moving mesh settings are now shared between physics interfaces, avoiding duplication of settings. The Rotating Machinery, Magnetic interface in the AC/DC Module now uses an updated version of the moving mesh functionality.

In this model, the boundary element method is used to model the open space outside the box, whereas the finite element method is used to model the submarine and its immediate vicinity. The box and submarine have been magnified by a factor of 20 in the plot. Additionally, postprocessing and visualization of boundary-element-based fields has been improved with automatic smoothing near boundaries.Ī submarine with its magnetic signature 1 km below it. Introduced with COMSOL Multiphysics ® version 5.3, the Electrostatics, Boundary Elements interface has been enhanced with support for electrostatic force calculations and new postprocessing variables on boundaries.

For example, hybrid FEM-BEM models can be used to model nonlinear anisotropic magnetic materials based on an FEM formulation with a surrounding domain that utilizes the new Magnetic Fields, No Currents, Boundary Elements interface. The interface also provides multiphysics coupling features for combining finite element method (FEM) and BEM modeling of more complex scenarios when used together with the finite-element-based Magnetic Fields, No Currents and Magnetic Fields interfaces. It solves for the scalar magnetic potential and can be used as a standalone interface to model permanent magnets with linear, constant, and homogeneous properties. New and Updated Boundary Element InterfacesĪ new physics interface has been developed based on the boundary element method (BEM): the Magnetic Fields, No Currents, Boundary Elements interface. Check out all of the AC/DC Module updates in more detail below.

For users of the AC/DC Module, COMSOL Multiphysics ® version 5.3a offers a new physics interface called Magnetic Fields, No Currents, Boundary Elements, postprocessing updates to the previously released Electrostatics, Boundary Elements interface, a new material model for modeling soft permanent magnets, and a new Surface Magnetic Current Density boundary condition.

Comsol 5.3 new