[GreenKeys] motor problems

[Jeffrey D Angus]

On 11/4/2016 7:21 PM, Brad via GreenKeys wrote:
> There is definitely a difference.  Whereas the new one spins freely (and
> keeps spinning a while when you manually spin it from the shaft), the
> other one, even with all the load off, still is sticky and requires more
> force to turn.
And example of how some motors have odd "not intuitively obvious"
problems.
When I worked at Junior's Tools, one of the things I had to fix were the
small "oil less" compressors. They apparently, all had the same motors
from Italy regardless of who's name was on the label.
Typically, they had the main body, and two ends held together with
long bolts. Occasionally we would get one with the starting capacitor
bad. But almost always what was wrong was the ends were shifted in
position. (The feet were no long flat.) The quick test was to un-bolt the
motor. If it rocked on the work bench, loosen the ends and realign them.
That solved 99% of the "It blows the breaker" complaints.
<http://static.ibsrv.net/car-repair/air-compressor.jpg>
Now the weird part about it was, there wasn't the slightest bit of
binding or stiffness to the motor when it was out of alignment, but it
it was, the motor would lock the rotor and blow the breaker.


-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com