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Analyzing a loudspeaker design

Loudspeaker with MagNet

A basic analysis of a loudspeaker design consists of analyzing the magnetostatic properties of a 2D axisymmetric design. In certain cases, 2D analysis is insufficient because of symmetry breaking features, for example, segmented magnets. In this case, a 3D model is needed. The same analyses can be performed in 3D as with the 2D analysis package.

The following diagrams show a typical 2D loudspeaker design in MagNet and the resulting contoured and shaded flux density fields, some 3D views, and the results of parameterization to the geometry of the model.

2D view with components description

METHODS and RESULTS

CONTOUR PLOT of the LOUDSPEAKER

A contour plot of the flux density in the initial design of the loudspeaker.

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SHADED PLOT of the FLUX DENSITY

A shaded flux density plot for identification of magnetically saturated regions.

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SEGMENTED MAGNET LOUDSPEAKER

3D representation of the segmented magnet loudspeaker is shown here. For simplicity, only a quarter of the full loudspeaker is represented.

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INITIAL 3D MESH of the LOUDSPEAKER

This illustration displays the same 3D model of the loudspeaker however the top place has been made invisible to show the gap in the magnet, as well as the 3D mesh created by MagNet.

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PARAMETERIZATION of the GEOMETRY

In this example, the original speaker dimensions were parameterized to allow the user to modify the speaker dimensions, without completely rebuilding the speaker model.

The Magnet OR (magnet outer radius) parameter is changed.

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GEOMETRICAL MODIFICATIONS to the LOUDSPEAKER

Shown here is the resulting change to the geometry, when the magnet outer radius parameter is increased to 45mm.

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