As the copper is annealed ( softened) by the fire, its better to cut the end off the loops before burning them.
Alternators, Inner. (armiture)
I have tried a bunch of methods, burning, unwinding, chisel & cut- then pull the wires out.
Each suits varying alternators, some you can unwind the wire from the armiture, even if you have to stand there for 1/2 a hour wiggling it each time it goes thru the wiggley slots.
Burning them removes the insulation, so theres more room in there to remove the wire.
Unfortunatly it also softens the wire & it snaps easy like...
I have used a chisle to cut thru the wire spool, then pulled the windings out with a pair of pliers.
Do the cutting before burning the armiture, as when you burn it, it loosens the wire spool, then when you cut the wire, it can & will shift around the shaft, stuffing things up.....
Sometimes you can burn it, then hammer the shaft off one end of the spool & get easy acess to the wire (this hardly ever works like that though...) Even when I cut 1/2 way thru everything with a grinder with cut off disc, the spools still grip the shaft..
Don't forget that the metal plate thats got the diodes on it (1/2 moon shape with small 12mm dia discs on it) is mostly made from copper too.