Finite element method (FEM) is becoming an increasingly powerful tool in transducer design process. However, the design of a high quality loudspeaker is not an easy task and requires to take into account many different factors. A trial and error approach is not an appropriate method for time and cost reasons. In this work, 2D axisymmetric FEM models are presented, suitable for design, optimization and analysis of moving-coil loudspeaker motors. The main aim is to give an in-depth look at: • non linear distortion causes related to the electro-mechanical transduction and electro-magnetic features • influence of the magnetic circuit mechanical tolerances on the loudspeaker performances COMSOL?R Multiphysics was used to set up FEM numerical models, successively processed in MATLAB R?. Simulations have been then validated with the aid of both commercial and in-house measurement setups. In some cases, models have room for improvement in order to find a better agreement with measurements, i.e. the THD prediction of the blocked voice coil. A better hysteresis model for the polar plates steel or a 3D approach should be taken, but this would further increase computational times making the model not suitable for quick evaluations during the pre-design phase.
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