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The Application of FEM to the Analysis of Loudspeaker Motor Thermal Behaviour

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A simple 2D Finite element method (FEM) may be applied within the thermal domain to analyse the behaviour of systems where fluid flow is not a significant factor. FEM's ability to analyze problems with arbitrary geometric form makes it a powerful alternative to the lumped element approach for modeling loudspeakers. Applying suitable boundary conditions, and using modified material properties, it is possible to model the thermal behavior of a loudspeaker motor with FEM. This approach minimizes errors due to fluid flow and includes heat radiation to the environment. The FEM technique is applied to a new driver topology with external frame and magnet. Static thermal FEM results are compared to those obtained from the driver by measurement. The material properties for air were derived from experimental results. A separate model, including the full mechanical structure of the coil, is used to derive its bulk thermal properties thus allowing a more efficient solution.

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