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Predicting loudspeaker current distortion with FEA

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In this work, COMSOL Multiphysics R? is used to simulate the current distortion produced in a blocked coil loudspeaker using the sweep method. First, the normal magnetisation curve and hysteresis loops of the soft magnetic material involved are measured. Then, current distortion measurements are performed on the loudspeaker motor under test. Finally, time domain models are developed ?rst using a lossless soft magnetic material (BH curve) and then using a hysteretic model (Jiles-Atherton). The simulations are then compared to the measurements and the results discussed. The use of lossless magnetic material models strongly underestimates odd harmonics, proving that if a correct prediction of current distortion is desired it is necessary to accurately model magnetic hysteresis.

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