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New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
A Study on Lumped Elements Model and Thermal Effects of Eddy Currents in Loudspeakers
A frequency-divided thermal model is developed to study the heat arising from the eddy currents in electro-dynamic loudspeakers. Using pure tone as test signal, the steady state temperature of the voice coil is measured point by point in high frequency range. The results illuminate on the contrast of all the existed lumped electrical-models of eddy currents and show distinctly which is better. Also, a set of innovative thermal expressions considering different circumstances are deduced from the frequency-divided thermal model. With these expressions and the measurement data, all the thermal elements’ value in the model can be obtained. And then arbitrary temperature rising course can be predicted easily if several necessary parameters are given.
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