Modeling, FEM analysis and dynamic simulation of a moving coil loudspeaker

This paper investigates on the use of a Finite Elements Method analysis software to simulate the behavior of a moving coil loudspeaker and in particular its magnet motor. After the implementation of a geometrical model and its analysis through the FEM software, a mechanical model of the motor has been created thanks to the Matlab simulation tool Simulink. The results of the first analysis are the inputs for the mechanical simulation. With the created model it is possible to simulate every kind of loudspeaker. It can be also used to improve existing speakers or to design new ones. This work shows the wide possibilities that these kind of software can offer to the engineer.

The paper investigates on the use of a Finite Elements Method analysis to simulate the behavior of a moving coil loudspeaker and its magnet motor. A geometrical model is prepared, suitable for FEM analysis; an electrical model is prepared and linked to the mechanical equations. The system as a whole is simulated by means of the Matlab tool Simulink. The model is completely general, and it can simulate every kind of moving coil loudspeaker. Parametric application of the software allows designing new speakers as well as it can lead to improving existing devices.