Electro magenetic damping

Jef Nuyts · 11:48 AM

Hello,

Maybe you guys can help me on this. I have made a driver (that really works on this moment) with a adjustable magnetic damping system. But I have a problem on this. I use a surround and spider to center the cone and voicecoil. When i reverse the current in the damping coil i can loosen up the damping or in normal direction i can tighten the damping. My question... I wan't to eleminate the spider and maybe the surround because the magnetic damping is 100% lineair over the whole range. Good spiders also over 80% but most surrounds not. The problem is to magnetic center the whole coil without a spider. I tried differtent things but without succes.
I read a post that said with no surround or spider the whole thing wil keep ringing. Maybe it is better to eleminate the spider and keep the surround? Wich one is better rubber or foam? Where can i find some lineair surrounds for 8" drivers? Thx for your help

JMFahey · 2nd January 2013, 11:41 AM

I don't think that you can fully eliminate suspension and surrounding and have the cone "float" in the proper position magnetically.

Jef Nuyts · 2nd January 2013, 06:16 PM

I think maybe ferrofluid is a solution? In combination with electromagnetic damping. No ringing because of the fluid damping caracteristics?

2nd January 2013, 07:30 AM	#1
Jef Nuyts diyAudio Member Join Date: Jan 2013	Electro-magnetic damping Hello, Maybe you guys can help me on this. I have made a driver (that really works on this moment) with a adjustable magnetic damping system. But I have a problem on this. I use a surround and spider to center the cone and voicecoil. When i reverse the current in the damping coil i can loosen up the damping or in normal direction i can tighten the damping. My question... I wan't to eleminate the spider and maybe the surround because the magnetic damping is 100% lineair over the whole range. Good spiders also over 80% but most surrounds not. The problem is to magnetic center the whole coil without a spider. I tried differtent things but without succes. I read a post that said with no surround or spider the whole thing wil keep ringing. Maybe it is better to eleminate the spider and keep the surround? Wich one is better rubber or foam? Where can i find some lineair surrounds for 8" drivers? Thx for your help Last edited by Jef Nuyts; 6th January 2013 at 11:48 AM.

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2nd January 2013, 11:41 AM	#2
JMFahey diyAudio Member Join Date: Mar 2009 Location: Buenos Aires - Argentina	I don't think that you can fully eliminate suspension and surrounding and have the cone "float" in the proper position magnetically.

2nd January 2013, 06:16 PM	#3
Jef Nuyts diyAudio Member Join Date: Jan 2013	I think maybe ferrofluid is a solution? In combination with electromagnetic damping. No ringing because of the fluid damping caracteristics?