PM> Re: Old box fan and 'Lectric Motors 101
PM> IIRC, I used to know a bit about Electric Motors. That
PM> was back around 1970, and my memory is poor.
PM> They must be building them to last. I haven't needed
PM> to work on one in many years.
PM> But, when it rains, it pours. Now I got 'bout 3 EM's
PM> that might need repair.
PM> One is an old K-mart box fan (a Lakewood K-223) that's
PM> gave good service for maybe 30 years. I even built a
PM> little stand for it ...
PM> So I turn it on hi yesterday and after a few seconds
PM> I got a pop and spark out of where the wries enter the
PM> motor, and it stops. Today I clean 30 years of crud
PM> from the windings etc, reassemble, and test on lo. It
PM> runs for 20 secs then does the pop/spark again (and
PM> quits). I unplug quickly.
PM> Here's the 'Lectric Motors 101 part. There's windings,
PM> brushes, and a rotor inside? Long time ago, it was
PM> practical to replace brushes as necessary for some
PM> EM's. What do you look for? What can you do/not-do?
Perhaps the problem is over the years the insulation has worn away
where the wires enter the motor? Inspect the wires at the site of the
pop/spark and anyplace else. Notice the plural: it takes two to make
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