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AC/DC Module

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Helmholtz CoilHelmholtz Coil

A Helmholtz coil is a parallel pair of identical circular coils spaced one radius apart and wound so that the current flows through both coils in the same direction. This winding results in a uniform magnetic field between the coils with...

Joule Heating in High-current Battery Clamps in a CircuitJoule Heating in High-current Battery Clamps in a Circuit

This model analyzes a car battery-charger circuit where the cables and clamps are modeled using the finite element method. They experience high current that results in Joule heating that in turn affects the conductivity of their...

The Electromagnetic Fields from a RailgunThe Electromagnetic Fields from a Railgun

A Railgun is a type of magnetic accelerator gun that utilizes an electromagnetic force to propel an electrically-conductive projectile. Current flowing through the rails sets up magnetic fields perpendicular to each other, forcing the...

A Tunable MEMS CapacitorA Tunable MEMS Capacitor

In an electrostatically tunable parallel plate capacitor, the distance between the two plates can be modified, as the applied voltage changes. The distance between the plates are tuned via a spring, to which one of the plates is attached....

Inductance of a Power InductorInductance of a Power Inductor

Power inductors are a central part of many low-frequency power applications. They are, for example, used in the switched power supply for the motherboard and all other components in a computer. There are only crude analytical formulas...

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...

Piezoresistive Elevator ButtonPiezoresistive Elevator Button

This example shows a model of a piezoresistive in-wall elevator button. It was designed with the following requirements in mind: durability with respect to high temperatures capability of producing signals that can be easily used in...

Simulating a Generator in 2D using Periodic Boundary ConditionsSimulating a Generator in 2D using Periodic Boundary Conditions

This model of a generator includes an ordinary differential equation (ODE) for the mechanical dynamics and computation of the torque resulting from the magnetic forces. In addition, it exploits symmetry to reduce the model size to 1/8...

3D Quadrupole Lens3D Quadrupole Lens

Just like optical lenses focus light, electric and magnetic lenses can focus beams of charged particles. Systems of magnetic quadrupole lenses find a common use in focusing both ion and particle beams in accelerators at nuclear and...

A 3D Simulation of a Magnetic Brake in ActionA 3D Simulation of a Magnetic Brake in Action

A magnetic brake consists of a permanent magnet, which induces current in the conductive material of a rotating disk. The resulting eddy currents interact with the magnetic flux to produces Lorentz forces and subsequently a braking...


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