Analyzing a loudspeaker’s voice coil response to a signalLoudspeakers with MagNet
In this example, we have analyzed the voice coil response to a signal by using MagNet's 2D Transient with motion solver. The solver includes coupling to the mechanical equations of motion, so that the movement of a component of a device (for example, the movement of the voice coil) is accurately simulated. The mechanical effects can include friction, inertia, mass, springs, gravitation, etc.
NOTE The initial transients are evident for the first 2 cycles in all of the graphs listed below. Also, the nonlinearity in the response of the voice coil due to the nonlinearity in the gap field is very evident.
METHODS and RESULTS
COMPLIANCE of the SPEAKER CONE
We define how the voice coil is suspended by defining a spring with a coefficient corresponding to the compliance of the speaker cone. In the illustration to the left, we show the spring coefficients used in the analysis.
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