View single post by Noah Britt
 Posted: Tue Sep 15th, 2020 02:13 pm
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Noah Britt

Joined: Sun May 26th, 2019
Location: South Carolina USA
William Dunlap wrote: Here's what I would do. I would lubricate the bearings with some heavy weight motor oil as a diagnostic tool. If it runs much quieter, then you likely have worn bearings. Perhaps you've already hung the fan upside down to see if it is quieter. That is very helpful.
It sounds to me like it's also out of balance...very likely the rotor, and running like a bat out of heck. I would tame that beast somehow. I've wound speed coils from nichrome wire to slow them down before.
Possibly the rotor shaft could be bent.
Have you installed a bridge rectifier in it? When you do this, they often run faster, but usually smoother, too.
If you have a rectifier, you may want to slow the motor down as they can be hard on the commutator then.

Thank you! I have hung the fan upside down; didn't help. I don't have a rectifier, and would rather get it running without problems before making it run slower. I have brushes on the way, and when they get here, I will try the heavy motor oil thing. Thanks for that suggestion! 

If the rotor shaft is bent, that wouldn't be fixable would it?