Transformer humming What to do about it

Peter from Holland

Diamond

Joined

Jan 15, 2005

Location

The Netherlands

• Aug 17, 2018

• #1

I have a Deckel FP2 milling machine
Powerfeed is by means of a DC motor
Now the 2phase transformer powering the drive for that motor is humming anoyingly
What can we do about that ??

Already kept my hand on it and I feel no vibration
Also cut the power to it to make sure it is that transformer

Peter

 

BugRobotics

Stainless

Joined

Jun 22, 2015

Location

Denver, CO

• Aug 17, 2018

• #2

I've never tried to repair a delaminating transformer but have heard of remedies including shellac or super glue applied to the laminations.

 

JST

Diamond

Joined

Jun 16, 2001

Location

St Louis

• Aug 17, 2018

• #3

Is it BUZZING, or humming?

Buzzing, a harsher noise, is often loose parts, like laminations, hitting together. Tighten any bolts, try to soak shellac etc into it... thin super glue I had not thought of but it is a good possibility also.

Humming, a low toned noise, is much harder to get rid of. Since it can be made worse by sheet metal acting as a sounding board, tighten up any fasteners on the sheet metal, or try rubber washers on the transformer mounting screws. If you try the washers, do not tighten the screws too much, looser is good for damping the vibration.

 

BugRobotics

Stainless

Joined

Jun 22, 2015

Location

Denver, CO

• Aug 17, 2018

• #4

Good question JST. Assumed it was delaminating.

 

TDegenhart

Diamond

Joined

Mar 26, 2011

Location

Geneva Illinois USA

• Aug 17, 2018

• #5

Another possibility is a piece of sheet metal close to the core. How big is the transformer?

Tom

 

rons

Diamond

Joined

Mar 5, 2009

Location

California, USA

• Aug 17, 2018

• #6

In the old days I learned about using clear nail polish. Today I would use something like clear varnish with a two part mix. A motor rebuild supply would have it.

 

Peter from Holland

Diamond

Joined

Jan 15, 2005

Location

The Netherlands

• Aug 17, 2018

• #7

Thinking about it It is bolted to the cabinet I first will unbolt it and place it on some rubber
If that is effective I can somehow isolate it from the cabinet
If that is not helping I ask my motor rebuilder
There is no easy fix then
Size is about 20x20x20 cm

Peter

 

JST

Diamond

Joined

Jun 16, 2001

Location

St Louis

• Aug 17, 2018

• #8

TDegenhart said:

Another possibility is a piece of sheet metal close to the core. How big is the transformer?

Tom

Click to expand...

Yes. Many will give a loud buzz when turned on, as they attract a sheet metal cover ot the like.

 

9100

Diamond

Joined

Nov 1, 2004

Location

Webster Groves, MO

• Aug 17, 2018

• #9

There is also magnetostriction, where the core deforms under the magnetic flux. With typical transformer iron it is not great but is there. Since it is a normal part of transformer operation, you are stuck with it.

Bill

 

M

Milland

Diamond

Joined

Jul 6, 2006

Location

Hillsboro, New Hampshire

• Aug 17, 2018

• #10

Ear defenders (earmuffs) - much better for you in the long run.

I'm so glad I started wearing them pretty religiously back in the early 90's. I can still hear pretty well after 40+ years in the trade, and that's priceless.

 

M

Milland

Diamond

Joined

Jul 6, 2006

Location

Hillsboro, New Hampshire

• Aug 17, 2018

• #11

Just to back that post up, it was precisely this sort of situation that got me wearing them. We'd gotten a Bridgeport V2XT (a pretty nice factory 3-axis conversion of a 2J), but the one downside was an annoying squeal from the servos.

I started wearing the muffs then, and have that machine to *thank* for still being able to hear well.

 

D

DDoug

Diamond

Joined

Oct 18, 2005

Location

NW Pa

• Aug 17, 2018

• #12

Tape the lyric sheet on the inside of the panel ?......

 

T

Tony Quiring

Titanium

Joined

Nov 5, 2008

Location

Madera county california usa

• Aug 17, 2018

• #13

Unmount and see if changes.

It could be directly culled to the sheet stock that amplifies it.

Rubber stand off easy fix.

It may be loose windings so mix some epoxy and thin with acetone.

With spoon drip it into the windings.

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