I have about 20 salvaged from various bits of agricultural equipment.
I got as far as stacking them on a couple of pallets with a view to
making my fortune from the scrap copper bandwagon. They are still here!
I can claim to have re-used 3. ..... 2x bench drills and one to power a
For the inventive minds, one is a geared single phase drive for stirring
the milk in a farm bulk tank...
Yeess, often these things are so bespoke it is really pointless trying to re
I heard a good one the other day, apparently thedisc rotaion motors of cd
and DVD drives are being used by aero modellers for driving the props round
after suitable moods and a new driver circuit.
Good luck and I hope they don't fly apart on them lithium batteries they
seem to use nowadays.
From the Sofa of Brian Gaff Reply address is active
"Roger Mills" < email@example.com> wrote in message
We've been using CD motors on aircraft for the last decade or so, they were
the first cheap way to get a brushless motor in the hobby,
Nowadays you can buy ready made very powerfull brushless motors for peanuts
it's hardly worth the bother, tho they do get sold with kits where you
re-wind the motor to get a rev range and power suitable for a larger prop.
The li-po batteries going up in a ball of flames is a good special effect
for war birds, that's if you are re-creating being shot down and crashing :)
I've been using li-po batteries for about 10 years now, treat them with
respect and they are fine, and they are the biggest advance in model flight
for a long time, so much power in such a light weight package... to think
when i first got an electric model plane, it could hardly get off the ground
due to the weight of the ni-cads, flew 4 minutes then the batteries were
Nowadays i fly for half an hour on a li-po pack, and have to use lead
weights to adjust the COG, as the pack isn't heavy enough like the old
ni-cad packs were.
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.
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