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Squirrel -cage motor noisy.

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Peter Jason
Guest

Thu Jan 24, 2019 3:45 am   



4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter

N_Cook
Guest

Thu Jan 24, 2019 9:45 am   



On 24/01/2019 02:14, Peter Jason wrote:
Quote:
4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter


Loose wires within a coil? douse with kopal varnish?

Mike Coon
Guest

Thu Jan 24, 2019 10:45 am   



In article <sn7i4e1brhin5meu1hgc1j03sbqavsj3a1_at_4ax.com>, pj_at_jostle.com
says...
Quote:

4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter


Squirrel wants out? (Well someone had to say it...)

Mike.

pfjw@aol.com
Guest

Thu Jan 24, 2019 1:45 pm   



On Wednesday, January 23, 2019 at 9:14:43 PM UTC-5, Peter Jason wrote:
Quote:
4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter


Some of these motors are bolted together. Tighten the bolts if you can reach them. Then, as noted, the coils can work loose from the laminations. Varnish, or thin Super Glue might work for that.

Peter Wieck
Melrose Park, PA

Terry Schwartz
Guest

Fri Jan 25, 2019 12:45 am   



On Wednesday, January 23, 2019 at 8:14:43 PM UTC-6, Peter Jason wrote:
Quote:
4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter


The bearings may not be hot but they can still get noisy.

Look165
Guest

Fri Jan 25, 2019 10:45 am   



Maybe some WD40 would help.

Peter Jason a écrit le 24/01/2019 à 03:14 :
Quote:
4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter


N_Cook
Guest

Fri Jan 25, 2019 1:45 pm   



On 24/01/2019 02:14, Peter Jason wrote:
Quote:
4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter


Is it being powered by clean sine 50/60 Hz or some sort of dirty
chopped/synthesised 3 phase via a converter?

Peter Jason
Guest

Sat Jan 26, 2019 1:45 am   



On Fri, 25 Jan 2019 12:31:21 +0000, N_Cook
<diverse_at_tcp.co.uk> wrote:

Quote:
On 24/01/2019 02:14, Peter Jason wrote:
4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter


Is it being powered by clean sine 50/60 Hz or some sort of dirty
chopped/synthesised 3 phase via a converter?


We have no choppers. And other squirrel motors on
the same power system are quiet as ever.

Peter Jason
Guest

Sat Jan 26, 2019 1:45 am   



On Thu, 24 Jan 2019 09:24:00 -0000, Mike Coon
<gravity_at_mjcoon.plus.com> wrote:

Quote:
In article <sn7i4e1brhin5meu1hgc1j03sbqavsj3a1_at_4ax.com>, pj_at_jostle.com
says...

4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?
Peter

Squirrel wants out? (Well someone had to say it...)

Mike.


I tried pouring oil down its nose, but the noise
never changes. Smile))

Adrian Tuddenham
Guest

Sat Jan 26, 2019 4:45 pm   



Peter Jason <pj_at_jostle.com> wrote:

Quote:
4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?


If it has a phase-shift capacitor, that has probably changed value and
is on the way to failing. Substitute another one of as near the right
value as possible and see if that stops or alters the noise. (Make sure
the capacitor is discharged each time before touching it.)


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

Adrian Tuddenham
Guest

Sun Jan 27, 2019 11:45 am   



Adrian Tuddenham <adrian_at_poppyrecords.invalid.invalid> wrote:

Quote:
Peter Jason <pj_at_jostle.com> wrote:

4-pole 3Ph squirrel -cage motor noisy.

A loud buzzing noise has developed over the past
12 months. The motor is not overheating, nor are
the bearings.

Is this serious?

If it has a phase-shift capacitor, that has probably changed value ...


My apologies, I didn't spot that you had said it was 3Ph.

It could be one phase disconnected, although that probably would make
more of a hum than a buzz. Laminations could be working loose in the
rotor or the windings working loose in the stator; the former will be
more likely to change on load or pulsate at slip frequency.

--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

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