I normally remove the insulation from magnet wire by
dunking the wire end in a solder pot. The molten solder melts the insulation and
tins the wire within a few seconds. An alternative to the solder pot is a normal
soldering iron and a "blob" of solder on the end. Run the molten blob up and
down the magnet wire and the insulation will melt and the wire tinned.
Alternatives include removing the insulation with
sandpaper or scraping it off with a knife or hobby knife. It's also possible to
use heavy duty paint remover to chemically remove most magnet wire insulation.
(At one time, small bottles of such chemicals were sold as "magnet wire
stripper" solution, but it's been many years since I've seen that product sold.)
Of course, not all magnet wire insulation is removable by
molten solder. The 200°C rated insulation, for example, can placed in a pot of
molten solder for hours on end and it comes out with as much insulation as it
went in with.
But there are times when I don't want to wait for the
solder pot to warm up.
I recently purchased a special purpose magnet wire
stripper tool manufactured by Knipex, a well known German tool company.