Looking for sketch of electomagnetic field of a transformer - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th March 2002, 03:04 PM   #1
diyAudio Member
 
Join Date: Mar 2002
Location: Aachen, Germany
Question Looking for sketch of electomagnetic field of a transformer

Hello,

Does anyone have a sketch - or know a web page where to find any - showing the electromagnetic field created by a transformer ?

The transformer I am thinking of has a normal M102 core.

The core looks like a closed 'M'
(top view, m means 'material of the core'

mmmmmm
m....m....m
m....m....m
mmmmmm

and the winding is around the middle part.

So, it is a standard transformer.

Where would the electric flux lines start and where would they close ?

Thanks a lot for your efforts,

Volker.
  Reply With Quote
Old 3rd April 2002, 05:13 PM   #2
diyAudio Member
 
Join Date: Feb 2002
The flux lines will travel within the core material.

using your drawing they will form two closed "circles" and look like this:

00

This is why the center of the M laminations is twice as thick as the sides: there is twice the flux through the center.
  Reply With Quote
Old 4th April 2002, 06:49 AM   #3
diyAudio Member
 
Join Date: Mar 2002
Location: Aachen, Germany
Hello J Epstein !

Thanks for the reply !

I assume that the field of the shape 00 is parallel to the drowing of the 'm'. I assume that it is parallel to the surface of this screen.

But what about the field that is perpendicular to the pane ?

Volker.
  Reply With Quote
Old 4th April 2002, 08:03 PM   #4
diyAudio Member
 
Join Date: Feb 2002
That's why cores use thin laminations: they are designed to keep the lines of flux in the plane of the laminations and not allow them to deviate from this plane. In the ideal case, there is no line of flux in any other direction.

In reality, there are fringe fields and eddy currents in the laminations which reduce the magnetic efficiency of the core. This is still much more efficient magnetically than air.

In an air cored transformer I think the lines of flux would look like the above example except they would be rotated about the central axis, so they would look like a donut instead of a flat 00.

(There are also some weaker fields that radiate out beyond these.) This is hard to draw in text, but I bet there is a reference on the web you could look at.

-j
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sketch For Bending Transducer (Prototype already built) LineArray Planars & Exotics 81 3rd May 2009 12:15 PM
Just a simple sketch.... Andy G Multi-Way 9 26th July 2007 09:10 AM
Box design sketch (pics) Ornlu Subwoofers 10 13th July 2005 02:22 AM
Sketch of my platter design InDaGroove Analogue Source 0 5th February 2005 03:54 PM


New To Site? Need Help?

All times are GMT. The time now is 01:48 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2