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Main >> Applications >> Sample problems >> Voice coil of a speaker

Voice coil of a speaker

This is an example of the speaker magnetic system simulation performed with QuickField software.

Problem type:
The axisymmetric problem of DC magnetics.

Geometry:
Voice coil of a speaker Calculate the magnetic flux density profile along in the air gap along the voice coil height Ø25 mm Ø60 mm 6 mm Voice coil Core Ferrite

Given:
The material of the magnet is ferrite with coercive force Hc = 500 kA/m;
Coil material - copper;
Core material - soft magnetic steel:

Task:
Calculate the magnetic flux density profile along in the air gap along the voice coil height.

Solution:
We create an axisymmetrical QuickField DC Magnetic problem with specified geometry and data, and make a plot of flux density versus coordinate B(z) in the air gap.

Results:
Flux density color map of the speaker magnetic system:

Voice coil motor magnetic field

Magnetic flux density distribution in the air gap along the voice coil height:

voice coil motor magnetic flux density

  • Download simulation files (files may be viewed using any QuickField Edition).

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