In article , Robert Galloway says...

Ever heard of a motor-generator where both functions were incorporated
onto one armature? Such things exist.

Ah, the classic "dynamotor" of ww2 fame. My first radio had the
B+ supplied by one of those - with the 'primary' run off a
train transformer!

I wasn't sure if it was actually going to work, it seemed like
a whacky idea with this little thing screaming away at speed.
Then I touched the output terminals and got one heck of a
shock. Yep, it works!

Jim


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