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COMSOL Multiphysics 案例库模型来自广泛的应用领域,包括电气、机械、流体和化工等行业。您可以下载现成即可使用的模型,以及详细的建模步骤说明,作为您建模工作的起点。请使用“快速搜索”查找与您的专业领域相关的模型,并登录或创建一个与有效的 COMSOL 许可证相关联的 COMSOL Access 帐户,下载模型文件。

永磁铁

本案例为一个静磁问题,研究了如何模拟马蹄形永磁铁。一种方法就是认为整个磁体为铁磁材料,两端定义为已磁化的两个相反的磁极。另一种方法就是设置已磁化部分的表面电流。本教学案例中,两种方法都进行了模拟。

赫姆霍兹线圈磁场分析

亥姆霍兹线圈是由一对相同大小的圆形线圈所构成,其中有同向流动的大小相同的电流,这种绕组在两个绕圈之间产生了均匀磁场。 亥姆霍兹线圈可以用来抵消地球磁场。亥姆霍兹场的产生可以根据应用的不同选择时变交流或者直流。

E-Core Transformer

This is the transient model of a single phase E-core transformer using a Multi-Turn Coil Domain. The model includes the effect of a nonlinear B-H curve in the core and shows how to connect the transformer model to the external circuits using Electric Circuit interface. The simulation is performed for two different cases; the first one with a unity turn ratio and second one with a turn ratio of ...

Voltage Induced in a Coil by a Moving Magnet

A magnet moving axially through the center of a coil will induce a voltage across the coil terminals. One practical application of this is in shaker flashlights, where the flashlight is vigorously shaken back and forth, causing a magnet to move through a multi-turn coil, which provides charge to the battery. In this model, the motion of a magnet through a coil is modeled, and the induced voltages ...

Computing Capacitance

A capacitor, in its simplest form, is a two terminal electrical device that stores electric energy when a voltage difference is applied across the terminals. The stored electric energy is proportional to the applied voltage squared and is quantified by the capacitance of the device. This model introduces a model of a simple capacitor, the electric field and device capacitance are solved for under ...

Modeling of a 3D Inductor

Inductors are used in many applications for low pass filtering or for impedance matching of predominantly capacitive loads. They are used in a wide frequency range from near static up to several MHz. An inductor usually has a magnetic core to increase the inductance, while keeping its size small. The magnetic core also reduces the electromagnetic interference with other devices as the magnetic ...

Generator in 2D

In this model, a rotor with permanent magnets and a nonlinear magnetic material rotates within a stator of the same magnetic material. The generated voltage in windings around the stator is calculated as a function of time. COMSOL Multiphysics models the rotation with assemblies and identity pairs. The nonlinearity of the magnetic material is also taken into account using an interpolation ...

Magnetic Brake

A magnetic brake consists of a permanent magnet, which induces currents in a rotating copper disk. The resulting eddy currents interact with the magnetic flux to produce Lorentz forces and subsequently a braking torque. This 3D problem is solved using a stationary formulation for the electromagnetic field coupled to an ordinary differential equation for the rotational rigid body dynamics. ...

Integrated Square-Shaped Spiral Inductor

This model considers a square inductor that is used for LC bandpass filters in MEMS systems. The simulation calculates the self-inductance. The first step in the modeling is to compute the currents in the inductor. These currents are the source for the magnetic flux computations, carried out in a second step.

Eddy 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 skin effect can be studied by giving the coil a non-zero conductivity.

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