[Milsurplus] vintage motor winding question

[J. Forster]

I assume this is an AC motor? Is the winding basically a solenoid on a "C"
shaped, laminated iron, core, with the motor armature in the gap of the
"C"?

Actually, it doesn't matter that much what the structure is. If a winding
is burnt, it's finished.

What happens is a few turns touch, the insulation fails, and you get
shorted turns.

The shorted turns act like a shorted transformer secondary and heat up.
This promotes more failures and pretty soon the whole thing is toast.

Aside: I've seen shorted turns causing a winding to glow dull red.

Strip it all off and start new, IMO.

-John

===============




>  Hope this is not too far off topic.
>
> While working on a Link Trainer restoration, the winding on a simple small
> shaded-pole motor went up in smoke. It's 1940-ish vintage and resembles
> the traditional record-player motor or small desk fan motor. However, it
> is not easily replaced by a modern motor due to parts of a gear train
> being mounted on it. I'm peeling off turns hoping the damage is in top
> layers and a partial rewind may repair it.
>
> My question is, when I think I've gotten past the burnt turns, and have DC
> continuity through the winding again, is there a way to detect whether
> there may be any shorted turns in the remaining part of the winding? All I
> can think of right now is to see if it overheats rapidly. Is there
> anything else to look for?
>
> TNX & 73,
>
> Wayne
> WB4OGM
>
>
>
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