Whitepaper

9
DALI A/S www.dali-speakers.com
LINEAR DRIVE MAGNET SYSTEM
For years designing magnet systems
has been a DALI specialty.
For the EPICON series we decided to
challenge the highest market standards
and to take magnet system design
further than ever before in order to
reduce distortion generated from less
than perfect magnet systems.
New materials, new processes - and
hundreds of hours of engineering
were needed.
And we are proud of the result!
The Linear Drive magnet system design
The Tools
First of all we needed to understand
the physics of the magnet systems in
loudspeakers even better than before.
The DALI R&D engineers did not
settle for using standard simulation
programs and commercially available
measurements systems.
Although well known Finite Element
Programs like COMSOL are used
for magnet system design, we have
developed and added our own software
for a better understanding of both DC
and transient physics in the motor
system (voice coil plus magnet).
Likewise, a custom built measurement
setup has been designed to give a
direct and precise reading of the profile
of flux density in the magnet gap, the
force factor versus excursion, and the
voice coil inductance as a function of
the position.
These tools have enabled us to
design and verify the motor system
performance to perfection.