RussellMc wrote:
> If my understanding is correct then the hardware design is super
> simplified. NO visible sine waves, DACS, ADC's PWM, filters etc.  Just
> connections to reed coils.
>
> Am I misunderstanding this?

It's hard to say.  I thought he was using the reed relays just for the coil=
s
to produce the magnetic field, which is there for some other purpose.  But
your interpretation could possibly be correct too, which of course greatly
simplifies the problem as you said.

The OP really needs to clarify, and learn to describe things better.

If the relays are used just to produce a magnetic field, it might illuminat=
e
things to explain why using such components not designed for that.  Why not
ordinary coils intended to produce a magnetic field?  This could be as
simple as magnet wire wound around nails or bolts with a drill.

You also might be able to wrap the coils around the whole thing that is
supposed to experience the rotating magnetic field.  I once had to write th=
e
firmware to drive a unmodified magnetic compass in a flight simulator to an=
y
arbitrary heading.  The compass was in a small enclosing box.  We could fit
two coils that sortof wrapped around the compass inside the box.  Of course
these couldn't be visible from outside, so they couldn't pass directly over
the compass.  They also couldn't cross at right angles as would have been
best due to physical constraints inside the box.  However, the two magnetic
vectors were different enough from each other that we got it working quite
nicely with a calibration lookup table in the firmware.  The earth's
magnetic field didn't matter since our magnetic field was many times
stronger, and what offset the earth did cause was accounted for in the
calibration along with correcting for the inconvenient geometry of the
coils.  These flight simulators were installed in fixed places and weren't
going to be moved after installation, so calibrating each unit upon
installation worked well enough.


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