Showing result: 1 - 10 of 16
Electro- & Magnetostatics
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Thermo-Mechanical Analysis of a Surface Mounted Resistor
The drive for miniaturizing electronic devices has resulted in today’s extensive use of surface-mount electronic components.
An important aspect in electronics design and the choice of materials is a product’s durability and lifetime.
For surface-mounted resistors and other components prod...
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Simulating a Generator in 3D
The generator analyzed in this model consists of a rotor with permanent magnets and a nonlinear magnetic material inside a stator of the same magnetic material.
The model calculates the static magnetic fields inside and around the generator.
The nonlinearity of the magnetic material is modele...
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A 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. For a given voltage difference between the plates, the distan...
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Magnetic Brake
This example studies a magnetic brake that slows down a copper disk rotating in the magnet’s air gap. The rotation induces currents, and forces along the current lines impede the disk’s motion.
COMSOL Multiphysics models the static problem of computing the induced currents, Simulink computes...
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Inductance 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 or empirical formulas available for calculating impedances, so...
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Model of an RFID System
An RFID system consists of two main parts:
A tag or transponder with a printed circuit-board (PCB) antenna
A reader unit with a larger RF antennaThe reader antenna generates an electromagnetic field that energizes a chip (IC-circuit) inside the tag. The electromagnetic field is modulated by the ta...
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Including an Explicit Model of an Inductor in the Simulation of an Amplifier Circuit
When an engineer is designing a new electronic component, like a capacitor or an inductor, the SPICE parameters for that device are not known. They are either extracted from finite element tools, such as COMSOL Multiphysics, or from measurements on a prototype. To speed up the design process it can...
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Joule 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 materials.
Use of the new SPICE Import interface in COMSOL Multiphy...
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Linear Electric Motor of Moving Coil Type
Linear electric motors (LEMs) are electromechanical devices which produce motion in a straight line directly, without the use of a mechanism to convert rotary motion to linear motion. The benefit over conventional rotary-to-linear counterparts is the absence of mechanical gears and transmission syst...
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Permanent Magnet
As an example of a magnetostatic problem, consider how to model a horseshoe-shaped permanent magnet. The entire magnet consists of a ferromagnetic material, but the two end sections, are pre-magnetized in different, opposite directions. The pattern of the magnetic field around such a permanent magne...
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