Gallery, Projects and General > How do I??

How do I find the fault

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boatmadman:
One last check before replacing the motor - are the grooves in the commutator ring clear? If they have filled with carbon from the brushes you can get these symptoms.

To clear them, just use a junior hacksaw blade to scrape out the gunk.

Ian

lordedmond:
Then do a proper drop test on the armature.

If you are not sure how to do it google is your friend .it can be a bit dodgy to do so I will not describe it here

Or use a growler to test for shorts

But sparking is a OC some were

Stuart

awemawson:
Stuart,

You gave me a funny turn then - I thought why drop the bally thing  :bang:

We used to do 'drop tests' on equipment destined for rockets and satellites. Steel frame with rails and drop the item onto aluminium honeycomb to give a controlled crush and controlled deceleration   :ddb:

OK I now realise you mean a VOLTAGE DROP test  :lol:

lordedmond:
Andrew

Its a thing when you have done winding for a number of years you just use the term of the trade

you are correct volt drop between segs with a dc voltage about 2 volts at 180 degrees  but lap and wave test different

we used to call the growler by another name that is very not PC nowaday  all I will say its very bad slang for a coloured person and leave it at that


IMHO  if the motor is in doubt get a new one its not worth the trouble for a easy procured part

I think if the OP lives were the ac volts are 110vac then the motor will be 90vdc and hear they are 180vdc

Stuart

Lykle:
 :update:

Well, I ordered a replacement motor from Arc Euro trade, gave my correct address and received it within a few days. :-)

First of all, it is not a direct replacement, mounting holes are different, the shaft is smaller and the outside diameter of the motor itself is larger than the one I had.
All issues that can be fixed easily. I will have to make a new pulley wheel as I do not want to shim a 10 mm hole to a 9 mm shaft.

Only point that is bugging me now is the following. Every time I switch the motor on, I hear a hum. I don't think I heard it before, with the old motor until after it crapped out. If I turn the POT meter to just beyond the click, the motor does not turn, it just hums. Then as I rotate to increase the revs, it starts to turn, but the hum never changes.
Is this normal? I can't remember hearing it before, but of course now I am a bit focused on the damn thing.

Thanks

Lykle

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