Loudspeaker analysis -- Thermal effects

MagNet is capable of handling material properties that are functions of temperature, thereby, making it possible to analyze a model (e.g., loudspeaker) for different body temperatures. Given that the magnetic properties of rare earth magnets are sensitive to temperature changes, we can parameterize the temperature of the magnet in a loudspeaker and obtain, for example, the force on a voice coil as a function of the magnet temperature. This is illustrated in the example to the left.

Results

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As you can see in the material property curve shown above, the properties change with the operating temperature. These curves were entered into a MagNet material database and used with the model shown here. The difference between this model and the models in the other loudspeaker analysis gallery pages, is the addition of a voice coil in the air gap (the copper colored rectangle).

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This graph shows the resulting Force on the voice coil.