Squirrel -cage motor noisy.
 

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 -cage motor noisy.
 

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


Loose wires within a coil? douse with kopal varnish?

Squirrel -cage motor noisy.
 

In article ,
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.

Squirrel -cage motor noisy.
 

On Wednesday, January 23, 2019 at 9:14:43 PM UTC-5, 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

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

Squirrel -cage motor noisy.
 

On Wednesday, January 23, 2019 at 8:14:43 PM UTC-6, 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

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

Squirrel -cage motor noisy.
 

Maybe some WD40 would help.

Peter Jason a écrit le 24/01/2019 Ã* 03:14Â*:
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 -cage motor noisy.
 

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?

Squirrel -cage motor noisy.
 

On Thu, 24 Jan 2019 09:24:00 -0000, Mike Coon
wrote:

In article ,
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. :-)))

Squirrel -cage motor noisy.
 

On Fri, 25 Jan 2019 12:31:21 +0000, N_Cook
wrote:

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.

Squirrel -cage motor noisy.
 

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?

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

Squirrel -cage motor noisy.
 

Adrian Tuddenham wrote:

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?

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