How to disassemble EI cores?

thunderpld · 5th March 2009, 05:59 PM

Can you tell me how to disassemble the transformers found in the computer psu?I need to rewind them to give higher voltages.

infinia · 5th March 2009, 06:03 PM

Usually glued together, so you need to find replacement cores.

star882 · 5th March 2009, 06:42 PM

Use a heat gun to melt the glue and they will come apart. Let the core cool naturally as trying to cool it fast may crack it.

infinia · 5th March 2009, 09:08 PM

We used permanent glue if it didn't have clips like ETD style.
IMO transformers using glues that come apart with heat is a waiting disaster from an OEM/distributor point of view.

star882 · 5th March 2009, 09:27 PM

Quote:

Originally posted by infinia
We used permanent glue if it didn't have clips like ETD style.
IMO transformers using glues that come apart with heat is a waiting disaster from an OEM/distributor point of view.

It has to be pretty intense heat to soften the glue. And they are taped together using high temperature tape so they are unlikely to fall apart even if overheated.

infinia · 5th March 2009, 10:59 PM

Quote:

Originally posted by star882

......high temperature tape so they are unlikely to fall apart even if overheated.

I'll buy that

paladinox · 5th March 2009, 11:58 PM

I have a better way!

Put it in really hot watter, wait everything get cold slowly.
When it is just a litle warm, use your hands to disassemble the core.

Easy.

thunderpld · 7th March 2009, 09:58 AM

Boiling them did the job.Thanks for the advice.

5th March 2009, 05:59 PM	#1
thunderpld diyAudio Member Join Date: Feb 2008	How to disassemble EI cores? Can you tell me how to disassemble the transformers found in the computer psu?I need to rewind them to give higher voltages.

5th March 2009, 06:03 PM	#2
infinia diyAudio Member Join Date: May 2005 Location: Californication	Usually glued together, so you need to find replacement cores. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

5th March 2009, 06:42 PM	#3
star882 diyAudio Member Join Date: Mar 2007	Use a heat gun to melt the glue and they will come apart. Let the core cool naturally as trying to cool it fast may crack it. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

5th March 2009, 09:08 PM	#4
infinia diyAudio Member Join Date: May 2005 Location: Californication	We used permanent glue if it didn't have clips like ETD style. IMO transformers using glues that come apart with heat is a waiting disaster from an OEM/distributor point of view. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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5th March 2009, 11:58 PM	#7
paladinox diyAudio Member Join Date: Jan 2009	I have a better way! Put it in really hot watter, wait everything get cold slowly. When it is just a litle warm, use your hands to disassemble the core. Easy.

7th March 2009, 09:58 AM	#8
thunderpld diyAudio Member Join Date: Feb 2008	Boiling them did the job.Thanks for the advice.

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