On 8/19/2012 1:52 AM, N_Cook wrote:
wrote in message ...
On 8/19/2012 12:37 AM, N_Cook wrote:
Is there an online calculator anywhere ? or failing that what sort of
"packing factor" for 0.08mm (+/- .005mm ) winding on a relay coil.
I have a good idea of the weight , subtracting an estimate of the
plastic
former and this would give the length from the density of copper but
number
ot turns ?.
Impregnated coil so cannot count-off turns
Rectangular section to coil , on the inside anyway, 14x 16.4mm , 16.8mm
width, outer layer is curved at "corners" and bulging (from the winding
not
abuse) so more scatterwound than precise regular lay-up .
Outer dimensions of 21.4mm bulge / 20.3mm , or so, at outer edges one
way
and 23.4/22.2mm , the other, a bit of geometry would give a good idea of
the
volume of this space but what ratio of that volume would be copper and
what
air+varnish, then what sort of weight would be contributed by the
varnish?


Wind more turns. As many as you can fit in your attention span.
2 is a lot better than 1.
Measure the inductance of each winding.
Or apply volts and measure the ratio.
Accuracy of the result is proportional to the number of
turns you add and the precision of your measurements.
Most anything electrical you do will give more accuracy than weighing
stuff.

Curiosity killed the cat...but I gotta ask, "why do you care?"
Sometimes people ask complicated questions when the solution
to their problem is very much simpler.

I forgot to say this coil has a burnt/sputtered patch


Yet you still refuse to disclose why you care.
Is the number of turns really the defining parameter for this winding?

Cut the winding off the core.
Take a high res picture of the face of the cut.
Calculate the area. Count the turns in a smaller area, multiply.