Temperature effect on voice coil resistance - 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 1st January 2002, 01:32 PM   #1
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
Default Temperature effect on voice coil resistance

How much can the resistance of a typical voice coil change over its operating temperature range assuming frequency remains constant? From the calculations I've done I figure that it will increase about 2.5ohms when temperature goes from 25 degrees celcius to 250 degrees celcius .... am I on the right track?
  Reply With Quote
Old 1st January 2002, 03:07 PM   #2
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Without going through and doing the math from scratch, I can't say whether that's exactly right, but it does sound as though it's in the ballpark.
The winding geometry (how many layers deep do they wind the coil), the coil former composition, vented spiders and/or pole pieces and other such arcana figure into how well the critter will shed heat, so it's difficult to relate the temperature rise to actual in-the-room music playing conditions. But if you're side-stepping those considerations and looking at it purely as temperature vs. resistance rise, then I'd say you're on the right track.
Doesn't the ESP site have some notes on this (perhaps in the active crossover section?), or am I thinking of another site?

Grey
  Reply With Quote
Old 1st January 2002, 03:10 PM   #3
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
Thanks Grey,

I got my info from the 5th edition Loadspeaker Design Cookbook then did the maths.

Oh and yeah i am looking at it purely as resistance vs. temperature.
  Reply With Quote
Old 1st January 2002, 03:17 PM   #4
Geoff is offline Geoff  United Kingdom
diyAudio Member
 
Join Date: Apr 2001
Location: UK
Nearly right, Grey. It is in the passive crossover article:

http://sound.westhost.com/lr-passive.htm
  Reply With Quote
Old 1st January 2002, 04:31 PM   #5
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Thanks, Geoff...

Grey
  Reply With Quote
Old 2nd January 2002, 01:14 AM   #6
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
Default Re: Temperature effect on voice coil resistance

Well after reading all the data and doing the maths again i've come to the conclusion that the resistive component of the driver in question (Re 5.7) will rise to about 14-15ohms when temperature goes from 25 degrees celcius to 250 degrees celcius ........ as to whether the voice coil of this particular driver will ever get this hot under normal operating conditions i dont know cause i havent gotten that far yet....
  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
Single Voice Coil Vs Double Voice Coil Subwoofer Workhorse Car Audio 6 12th April 2007 06:36 AM
ASV voice coil ? Nihilist Multi-Way 4 1st October 2006 07:16 PM
an amp for each voice coil? speekergeek Multi-Way 1 12th December 2003 02:31 AM
constructing sub voice coil emarald Multi-Way 3 5th April 2003 06:51 PM
A question on v coil resistance (NOT impedance) Fossil Multi-Way 3 29th August 2002 04:27 AM


New To Site? Need Help?

All times are GMT. The time now is 11:19 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