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1930s Gilbert cub fan?  Rate Topic 
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 Posted: Fri Dec 22nd, 2017 01:11 pm
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Felix Cook
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Hi Im putting together this fan and cant remember how the whether the live wire connects first to the field coil or the brushes. Its a series universal motor. Is this obvious? Would this make a big difference? I have a feeling it went to the armature. Guessing this would be a simple 50/50 answer.  Any

help very much appreciated. 

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 Posted: Sat Dec 23rd, 2017 09:07 am
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John McComas
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An easy way to determine wiring is to look for the internal connection going from the field winding to one of the brushes.  Then connect power to the other side of the field winding and the other brush holder.  See picture.

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 Posted: Sat Dec 23rd, 2017 09:44 am
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Felix Cook
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hi thanks for looking. I would do that but its all being completely disconnected a while back, all i have is 2 wires coming out of the armature and 2 sticking out of the windings, some diagrams like the one below have the brushes connected first in series before the winding, does it make any kind of difference which is connected first in line to the positive wire, as in which part gets powered a split-second before the other.

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 Posted: Mon Dec 25th, 2017 06:37 am
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Jim Kovar
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Sometimes the supply wires

connect directly to the field
coils and the other ends of
the coils to the brushes.


Last edited on Mon Dec 25th, 2017 06:37 am by Jim Kovar

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 Posted: Mon Dec 25th, 2017 04:32 pm
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John McComas
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It doesn't matter which gets connected to the power first.

Just make sure it is connected in series.

Since all four wires have been disconnected, you have a 50/50 chance of the rotor turning in the right direction.

Before you make connections permanent, I would temporary the connections to make sure rotor is turning in the
right direction. If not swap the two coil connections, or swap the two brush connections.
Happy Fanning!

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 Posted: Wed Dec 27th, 2017 04:27 am
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Jim Kovar
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And make sure you have one

each, North and South poles.






Last edited on Wed Dec 27th, 2017 04:28 am by Jim Kovar

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 Posted: Mon Jan 1st, 2018 02:10 am
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Felix Cook
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thanks everyone interesting thoughts on this,feel better for the fan knowing what im doing cant wait to hear this commutator one blowing again

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