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Main >> Applications >> Sample problems >> Loudspeaker

Dynamic loudspeaker inductance

QuickField simulation example

Problem Type
Axisymmetric multiphysics problem of magnetostatics coupled to AC magnetics.

Geometry
Dynamic loudspeaker Calculate the loudspeaker coil inductance with respect to core saturation. Core Magnet Coil

Given
Permanent magnet coercive force Hc = 500 kA/m
Coil current i = 0.1 A
Magnetic permeability of core - B-H curve:

Task
Calculate the loudspeaker coil inductance with respect to core saturation.

Solution
Magnetic state of the core affects the inductance value. The problem is solved in two steps. First the magnetic field of the permanent magnet is simulated and the core permeability (magnetic state) is calculated. The magnetic state is then imported in the second problem. In the second problem the magnetic field of the coil is simulated and the inductance is calculated.
magnetic state import

Result
Core saturation caused by permanent magnet. Coil inductance L = 1.5 mH.
dynamic loudspeaker inductance