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Electromagnetics Modeling Presentation, General IntroductionElectromagnetics Modeling Presentation, General Introduction

This presentation gives an overview of the electromagnetics modeling capabilities of the COMSOL Multiphysics environment. The focus is on the products AC/DC Module and RF Module. Statics, Low-Frequency and High-Frequency applications...

Inductive Heating of a Copper CylinderInductive Heating of a Copper Cylinder

The induced currents in a copper cylinder produce heat that in turn change the electrical conductivity. This means that the field propagation has to be solved simultaneously with the heat transfer through the cylinder and surrounding...

A Tunable MEMS CapacitorA Tunable MEMS Capacitor

In an electrostatically tunable parallel plate capacitor, the distance between the two plates can be modified by a spring, as the applied voltage changes. For a given voltage difference between the plates, the distance of the two...

Inductor in an Amplifier CircuitInductor in an Amplifier Circuit

This model shows how to combine an electric circuit simulation with a finite element simulation. The finite element model is an inductor with a nonlinear magnetic core and 1000 turns, where the number of turns is modeled using a...

Eddy CurrentsEddy Currents

Induced eddy currents and associated thermal loads is of interest in many high power AC applications. This example is of general nature and illustrates some of the involved physics as well as suitable modeling techniques in the AC/DC...

Induction Currents from Circular CoilsInduction Currents from Circular Coils

A time-varying current induces a time-varying magnetic field. The magnetic field induces currents in neighboring conductors. The induced currents are called eddy currents. In this model, the phenomenon is illustrated by a time-harmonic...

Eddy Currents in a CylinderEddy Currents in a Cylinder

An AC coil surrounding a metal cylinder induces eddy currents in the cylinder. The driving current in the coil can be specified in two ways: either as an external current density or as equivalent surface currents. In the first case, the...

Magnetic LensMagnetic Lens

A scanning electron microscope samples images by scanning a target with a high-energy beam of electrons. The subsequent electron interactions produce signals such as secondary and back-scattered electrons that contain information about...

Particle Tracing in a Quadrupole Mass SpectrometerParticle Tracing in a Quadrupole Mass Spectrometer

The principle component of a quadrupole mass spectrometer is the mass filter which is used to filter ions with different charge to mass ratios. The quadrupole mass filter has been well studied over the years, Ref. 1 and the physics and...

Electric Impedance SensorElectric Impedance Sensor

Electric impedance measurements are used for imaging and detection. Applications range from nondestructive testing and geophysical imaging to medical imaging. Several alternative techniques are shown to model such a system. One of them...


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