pole piece material? - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 26th February 2004, 06:27 AM   #11
Wizard of Kelts
diyAudio Moderator
 
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
According to the fellow with the field coil loudspeaker, Permendure costs $1000 per kilo, or $28 an ounce.

How many ounces does a pole piece weigh? Take a 12 inch woofer with a half inch linear travel and a 2 inch voice coil-how much would the pole piece weigh?
__________________
"A friend will help you move. A really good friend will help you move a body."
-Anonymous
  Reply With Quote
Old 26th February 2004, 11:35 AM   #12
tuneman is offline tuneman  Australia
diyAudio Member
 
Join Date: Feb 2004
Location: pitts of hell!!
thanks for that so where do you aquire those types of steels? especially in a australia, any australians here know?

and what exactly are faraday rings? i've see copper rings used on the motors on compression drivers and some 6 inch mids once is this what your talking about?
  Reply With Quote
Old 26th February 2004, 01:29 PM   #13
Wizard of Kelts
diyAudio Moderator
 
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
Faraday rings? Shorting rings? They can be made of aluminum or copper. Don't forget extended pole pieces.

This interesting link explains all.
http://ldsg.snippets.org/motors.php3
__________________
"A friend will help you move. A really good friend will help you move a body."
-Anonymous
  Reply With Quote
Old 17th March 2004, 06:26 PM   #14
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
Hep Me! Hep Me!

New guy here. I'm working on a subwoofer driver design & prototype (first one - getting my feet wet). Does anyone know of a source for some 1/4-inch thick 1006 plate (or 1008 or 1010 [thanks DanW]) . I'll need eight 16" by 16" squares.

Thanks, Casey Walsh
  Reply With Quote
Old 17th March 2004, 08:05 PM   #15
markp is offline markp  United States
diyAudio Member
 
Join Date: Oct 2003
Location: L.A., CA
Quote:
Originally posted by SmarmyDog
Hep Me! Hep Me!

New guy here. I'm working on a subwoofer driver design & prototype (first one - getting my feet wet). Does anyone know of a source for some 1/4-inch thick 1006 plate (or 1008 or 1010 [thanks DanW]) . I'll need eight 16" by 16" squares.

Thanks, Casey Walsh
Industrial Metal Supply in California and on the net has every metal in every variety(almost). Also try McMaster/Carr on the net for all your needs.
__________________
If it sounds good... it is good!
  Reply With Quote
Old 18th March 2004, 09:45 AM   #16
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Doesnt the pole piece need to be magnetic?
I was taught that the reason the cores for transformers were made from soft iron is that it doesnt retain a magnetic field when one is applied to it. So your traffo isnt going to turn into one huge permenant magnet after a while of use.

Obviously the AC put thru it would tend to magnetise it one way then the other, if thats possible. Maybe its just soft iron is easily demagnetised but is also easily magnatised too, so if nothing is going to kill the magnetic field it will remain strong.

Either way id like to know. Was my physics teacher wrong? I cant imagine he was because he was very good and was very intelligent.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 18th March 2004, 06:58 PM   #17
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
In my quest for some 16 x 16, thick plates of a high-permeability metal, do I need to be concerned with Electrical Resistivity, Saturation Flux Density, Coercivity, Residual Induction, or Hysteresis Loss?

BTW, another source of metal is http://www.scientificalloys.net.

-Casey Walsh
  Reply With Quote
Old 5th August 2006, 02:32 AM   #18
million is offline million  Malaysia
diyAudio Member
 
Join Date: Aug 2006
Send a message via MSN to million Send a message via Yahoo to million
Post Pole piece / Back plate material

We are a menufacturer for loudspeaker pole piece, so I can tall you that we used low carbon steel (SEA-1006 & SEA-1008) to produce pole piece.




http://www.million.url.tw Click the image to open in full size. Link
Attached Images
File Type: gif ccyoke.gif (18.8 KB, 107 views)
  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
WHY???? Midrange magnet's vented pole piece sealed by design - Thiel CS3.5 ???? dtm1962 Multi-Way 1 24th July 2008 04:28 PM
WTB: CS8412-CP - 1 piece reaction Swap Meet 1 12th October 2006 10:53 AM
XXLS - No Pole Piece Vent mike.e Subwoofers 7 7th January 2005 09:49 AM
Pole Piece Q ALFIrE Multi-Way 3 24th December 2004 06:09 PM


New To Site? Need Help?

All times are GMT. The time now is 01:16 PM.


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