Magnetostatic speaker - QuickField simulation example
Magnetostatic speaker consists of a set of permanent magnets and a planar diaphragm. Aluminum strips carrying current are attached to the diaphragm.
How to find magnetostatic speaker magnetic field?
Answer Typical applications Geometry
Given
Task
Solution
Results
Reference: Wikipedia: Magnetostatic loudspeaker
Engineering question
Set up a plane-parallel QuickField DC Magnetics problem for a magnetostatic speaker and evaluate magnetic field distribution from computed field results.
planar magnetostatic speakers, flat-panel loudspeakers, permanent magnet audio drivers
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Simulation problem
Problem Type
Plane-parallel problem of DC magnetics.
Permanent magnet coercive force HC = 500 kA/m;
Current I = 0.1 A
Lz = 1 m
Calculate force acting on a diaphragm.
In real device the AC current flows in the strip. Peak force value depends only on the current magnitude, and does not depend on frequency. This allows us to simulate DC problem instead of AC to calculate peak force value.
Due to model symmetry we can reduce simulation domain.
Magnetic force acting on a strip of the diaphragm is 0.033N per 1m of strip z-length.
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