14 Mar
2010
14 Mar
'10
12:39 p.m.
Tony Duell wrote:
I've done a bit of that too over the years, just a few motors but more
transformers. One thing that has always troubled me is the usual poor
condition of what I believe is at least sometimes called the "fish
paper" used to provide extra insulation between the coating on the wires
and the stator/armature/core metal. Back in my younger more foolish
days I'm afraid I was sometimes guilty of using ordinary card stock as a
solution, though I've wondered if that is not a bit of a fire hazard in
spite of "Fahrenheit 451". I'd just be interested in hearing your
thoughts on this issue.
Thanks,
Charlie C.
#40 is really,
really thin (<0.08 mm, ~0.003in), only likely to be used for
winding coils.
And darn hard to find in sensible quantities...
I was rewinding a coil with #38 a couple weeks
ago, not much latitude for
indelicate slip-ups.
I rewound a couple of motors useing 38swg wire (5 thou, 0.15mm or
thereabouts) a month or two ago. It was a lot easier than I expected,
even though I got the connections to the commutator wrong the first time
and had to wind that armature again.
Actually, this was on-topic. The motors were from an HP9125A plotter,
which is used with the HP9100 calculator. The HP9125 is all discrete
transsitors (mostly bipolar, but a few JFETs), there are almost 100
transistors on each DAC board.
-tony