New and Updated Models, Apps, and Add-ins in Version 6.4
Thermal Analysis of a High-Power IGBT Module
This industrial-scale proof-of-concept model demonstrates how to perform an electric–thermal analysis of a high-power insulated-gate bipolar transistor (IGBT) module. The module has a rated voltage of 1200 V and a nominal current of 1800 A. The generated heat is dissipated through a heat sink, and the currents and the temperature profile are evaluated in the semiconductors, the metallization layers, and the bond wires. The model uses the Joule Heating multiphysics interface that combines Electric Currents and Heat Transfer in Solids, together with the Electromagnetic Heating multiphysics coupling.
Cell Membrane Electroporation
Electroporation is a technique where a localized electric field is used to generate nanometric pores in cell membranes, improving the cell permeability for ions and pharmaceuticals. This model shows the electroporation of a spherical cell by means of a nanosecond electric pulse. The model uses the Electric Current interface, Boundary ODEs and DAEs interface, and multiple Debye dispersive material data in the time domain and in the frequency domain.
Induction Heating of a Moving Ferromagnetic Mechanical Part
Induction heating is used for various metallurgical processes such as hardening. In this model, the 3D induction heating of a mechanical joint passing through an induction heating coil is simulated. Curie point effects and temperature-dependent resistivity in the iron are taken into account.
Thin Conductive Layer Using the Transition Boundary Condition
In electromagnetic simulations of, for example, transformers and converter stations, one often needs to include geometrically thin conductive layers. Explicitly meshing these thin layers can be computationally expensive and numerically challenging. In COMSOL®, you can approximate conductive layers by using the Transition Boundary Condition (TBC) or Impedance Boundary Condition (IBC) boundary feature. This model demonstrates that the TBC can produce accurate results in both time-domain and frequency-domain simulations.
Nonlinear Ferromagnetic Diaphragm
A magnetic diaphragm is a flexible, thin structure that interacts with magnetic fields to perform mechanical or sensing functions. When subjected to an external magnetic field, the diaphragm deforms due to magnetomechanical interactions, converting magnetic energy into mechanical displacement or, conversely, mechanical deformation into changes in the magnetic field distribution. This model studies the magnetomechanics of a magnetic diaphragm using the Magnetomechanics, Shell multiphysics interface.
Static Field Modeling of a Halbach Rotor (Model Update)
This example presents the static-field modeling of a flux-focusing magnetic rotor using permanent magnets, a magnetic rotor also known as a Halbach rotor. The use of permanent magnets in rotatory devices such as motors, generators, and magnetic gears is increasing due to their no-contact, frictionless operation. This model illustrates how to calculate and change the magnetic field of a Halbach rotor in 3D by changing the number of permanent magnet segments and the number of pole pairs.
B–H Curve Checker (App Update)
The B-H Curve Checker app has been updated to improve output curve quality both around the zero point and for the saturation region. The app now allows for removing nonmonotonic behavior of the differential permeability around the zero point. In addition to this, it provides better extrapolation options for the fully saturated region.