Tim said I should post this here also:
I have an old split phase induction motor that runs quite well.
Especially considering the fact that it is at least 60 years old. But
it makes a funny sound when running but the sound disappears
immediately whe power is removed. It sounds like something is a little
loose. Sorta like if the shaft was oscillating back and forth between
the thrust bearings. But it is not that. My son suggested that maybe
one of the windings is loose and rattles a little back and forth when
the polarity of the AC voltage changes. Anybody got a clue?
Thanks,
Eric

fired this volley in
:

. Anybody got a clue?

Some laminations are probably loose. They make a buzz at 60Hz, if so.

If it's RPM-related, it actually could be a bearing. Motors do not usually
put exactly uniform torque on one end or the other, and can skew the shaft
enough to make a bad bearing sing.


LLoyd

Eric - I've a similar sound that started recently - tinny vibration as
though the sheet metal in the start switching mechanism is loose? If you
find an answer, do post it.

Hul

wrote:
Tim said I should post this here also:
I have an old split phase induction motor that runs quite well.
Especially considering the fact that it is at least 60 years old. But
it makes a funny sound when running but the sound disappears
immediately whe power is removed. It sounds like something is a little
loose. Sorta like if the shaft was oscillating back and forth between
the thrust bearings. But it is not that. My son suggested that maybe
one of the windings is loose and rattles a little back and forth when
the polarity of the AC voltage changes. Anybody got a clue?
Thanks,
Eric

On Tue, 7 Oct 2014 21:32:29 +0000 (UTC), Hul Tytus
wrote:

Eric - I've a similar sound that started recently - tinny vibration as
though the sheet metal in the start switching mechanism is loose? If you
find an answer, do post it.

Hul

I will post any answers I get.
Eric

wrote:
Tim said I should post this here also:
I have an old split phase induction motor that runs quite well.
Especially considering the fact that it is at least 60 years old. But
it makes a funny sound when running but the sound disappears
immediately whe power is removed. It sounds like something is a little
loose. Sorta like if the shaft was oscillating back and forth between
the thrust bearings. But it is not that. My son suggested that maybe
one of the windings is loose and rattles a little back and forth when
the polarity of the AC voltage changes. Anybody got a clue?
Thanks,
Eric

Eric - When reading your message I translated "split phase" to "capacitor
start". Some days.

Hul

wrote:
On Tue, 7 Oct 2014 21:32:29 +0000 (UTC), Hul Tytus
wrote:

Eric - I've a similar sound that started recently - tinny vibration as
though the sheet metal in the start switching mechanism is loose? If you
find an answer, do post it.

Hul

I will post any answers I get.
Eric

wrote:
Tim said I should post this here also:
I have an old split phase induction motor that runs quite well.
Especially considering the fact that it is at least 60 years old. But
it makes a funny sound when running but the sound disappears
immediately whe power is removed. It sounds like something is a little
loose. Sorta like if the shaft was oscillating back and forth between
the thrust bearings. But it is not that. My son suggested that maybe
one of the windings is loose and rattles a little back and forth when
the polarity of the AC voltage changes. Anybody got a clue?
Thanks,
Eric

On Wednesday, October 8, 2014 5:38:38 PM UTC-4, Hul Tytus wrote:
Eric - When reading your message I translated "split phase" to "capacitor

start". Some days.

60 year old motor? Maybe induction-start induction-run.