Voice coil of a speaker

QuickField simulation example

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

Problem Type
The axisymmetric problem of DC magnetics.

Geometry

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

Task
Calculate the magnetic flux density profile 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:

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

• Video: Voice coil of a speaker. Watch on YouTube.
  
• Download simulation files (files may be viewed using any QuickField Edition).