PLUR 2 Evolution - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 13th November 2009, 04:05 AM   #1
Borat is offline Borat  United States
Banned
 
Join Date: Aug 2009
Location: Silicon Valley & NYC
Default PLUR 2 Evolution

hello it's me again - George Chkhartishvili

that's right boys and girls. i took the most linear ( and dare i say, elegant ? ) ribbon motor design ( my own, if you recall ) :

Plur

and made it MORE LINEAR

behold ! PLUR 2 Evolution

Click the image to open in full size.

if you refer to the original you will see that the difference is the addition of end caps. these are regular magnetic steel used to build speaker motors.

the result is a DRAMATIC improvement in symmetry resulting in dramatically improved field uniformity.

in fact PLUR 2 Evolution can be optimized for ABSOLUTELY uniform field.

the reason you can see a bit of "noise" in the flux lines on that graph is constructed the outline of the neodymium out of just 3 arcs wit the dimensions optimized by eyeballing the result. i spent about 10 minutes optimizing the shape. the shape can easily be, as i said, easily optimized for ABSOLUTE field uniformity.

once again i encourage those of you who like to build your own ribbons to build a prototype of this, as i don't really have time/money/energy to build one myself at the moment.

ps: this particular simulation is for a motor that will accomodate a 4" wide ribbon for an XMAX of about 10mm. the basic dimensions haven't changed but thanks to greater uniformity now the ribbon can take advantage of the entire width of the neodymium.

thanks for stopping by.

George Chkhartishvili.
Attached Images
File Type: jpg PLUR 2 EVO.jpg (164.6 KB, 442 views)

Last edited by Borat; 13th November 2009 at 04:29 AM.
  Reply With Quote
Old 13th November 2009, 04:38 AM   #2
Borat is offline Borat  United States
Banned
 
Join Date: Aug 2009
Location: Silicon Valley & NYC
think of an underhung woofer. the reason they are so linear is because the field is controlled on all sides of the voice coil by the gap.

in a regular woofer the parts of the voice coil outside of the gap are hanging in an uncontrolled field which is wildly nonlinear.

similarly in a regular ribbon motor the field is just hanging out there. it couldn't possibly be uniform because it is only being controlled from one side.

here in PLUR 2 Evolution the field is contained on all 4 sides. this is what ulimately enables the uniformity. and this makes it similar to an underhung woofer motor in some philosophical sense. although an underhung woofer doesn't control it on all 4 sides so actually there is no analogue to this design at all.
  Reply With Quote
Old 13th November 2009, 11:33 PM   #3
Borat is offline Borat  United States
Banned
 
Join Date: Aug 2009
Location: Silicon Valley & NYC
Some labels from FEMM in case it's not clear what's going on.

Click the image to open in full size.
Attached Images
File Type: jpg PLUR 2 Evo Labels.jpg (49.6 KB, 383 views)
  Reply With Quote
Old 19th November 2009, 02:58 AM   #4
thadman is offline thadman  United States
diyAudio Member
 
Join Date: Dec 2005
Location: west lafayette
Very interesting

Aside from the uniform field, wouldn't the steel increase the inductance of such a system, resulting in a smearing of transients and temperature dependent field?

Recall the behavior of the core material in transformers. I believe you will observe air-core transformers to have significantly lower inductance compared to a transformer with a steel core.
__________________
"It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them."
  Reply With Quote
Old 19th November 2009, 03:23 AM   #5
thadman is offline thadman  United States
diyAudio Member
 
Join Date: Dec 2005
Location: west lafayette
Have you thought of replacing the steel caps with neodymium caps?

I don't think you'd observe the increase in inductance
__________________
"It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them."
  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
Plur Borat Planars & Exotics 23 29th December 2010 01:52 PM
Evolution of the Tapped Horn Don Snyder Subwoofers 30 18th August 2010 01:06 PM
PLUR vs Isodynamic Borat Planars & Exotics 4 15th November 2009 04:58 AM
evolution algorithm Jamh Everything Else 0 8th June 2009 05:04 PM
Evolution MK-7 midi keyboard em2006 Instruments and Amps 1 12th September 2008 08:55 PM


New To Site? Need Help?

All times are GMT. The time now is 08:47 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