"mrcheerful ." wrote in message
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"Andrew Gabriel" wrote in message
...
Whilst visiting parents, I got called upon to investigate vacuum cleaner.
Apparently, whilst being used, the motor started slowing down and giving
off a burning smell. I was expecting a motor brush to have worn out, but
on investigating, the brushes were fine. The commutator was a bit dirty,
which I cleaned up with some fine sand paper, but there was nothing else
obviously wrong with the motor. When I had the brushes out, the armature
spun very freely in its bearings. Having reassembled it, I ran it for a
few minutes without the brush bar belt, and the drive shaft had got hot
enough to burn me, although the motor didn't slow down, so I'm not sure
if I changed things by cleaning the commutator. Connected back the brush
bar and used it for a few minutes -- smell of hot electrics, although it
seemed to be working. I had also cleaned the internal filters, but they
weren't heavily clogged, and the bag was only a 1/3rd full.

Any suggestions what might be wrong with it?
If it's a gonner, would be good to get a new one while the sales are on.

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Andrew Gabriel

from your description, the motor has a dodgy armature. Check how many
amps it is pulling, 5 for a 1000w is correct.

mrcheerful

I had an Electrolux upright (bagless) - it had an air cooled bearing! A tube
connected to the bearing area to create a low pressure area so that cooling
air would be drawn to the bearing area.

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Regards

John