In article ,
"Brian Gaff" writes:
Yeess, often these things are so bespoke it is really pointless trying to re
utilise them.

For an older machine, they are just universal mains motors with
separate field and armature connections for reversing, and someones
an extra field winding for the extra power on top spin speed. Some
have a tachometer to feed back the speed if the machine is controlled
by a microcontroller.

*However*, these are always run with speed or power controllers, and
a load attached. If you try and spin one up without any speed control
and without a load, some will spin fast enough for the armature to
fly into pieces (rather explosively), so you should never do that.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]