This is an example of the speaker magnetic system simulation performed with QuickField software.
The axisymmetric problem of DC magnetics.
All dimensions in millimeters.
The material of the magnet is ferrite with coercive force Hc = 500 kA/m;
Coil material - copper;
Core material - soft magnetic steel.
Calculate the magnetic flux density profile along in the air gap along the voice coil height.
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.
Flux density color map of the speaker magnetic system:
Magnetic flux density distribution in the air gap along the voice coil height: