small crack in torroid!!future of torroid?

sagarverma · 4th November 2005, 07:00 PM

does a small crack has capability to render torroid useless.
the crack is thin but a bit deep.its in inner dia

dhaen · 4th November 2005, 07:06 PM

Presumably this is a mains transformer.....
As long as no gap exists (causing loss of inductance leading to overheating) there should be no problem IMO.

You might be best to clamp it so a gap can't develop. Beware of accidentally creating a "shorted turn" if using a metal clamp arangement.

sagarverma · 4th November 2005, 07:12 PM

see the pic
this is the use.
in smps.

dhaen · 4th November 2005, 07:17 PM

I can't see a crack with this level of resolution.

sagarverma · 4th November 2005, 07:27 PM

see these.
i suppose these show properly.core dia 14cm.

sagarverma · 4th November 2005, 07:30 PM

and this

dhaen · 4th November 2005, 08:02 PM

I don't think it will make any measureable difference. Many non-toroid HF cores' fields are completed by sections just touching.

sagarverma · 4th November 2005, 08:13 PM

but with transformer,my smps not giving any o/p

switcher ok
mosfets.ok
rectifiers,ok
only this suspect remaining.

its giving me headache bec i spent ten times more than what the req core would have costed(its 14cm,only 5cm max req.)

dhaen · 4th November 2005, 08:19 PM

I don't think it could cause no output.
Assuming it has worked previously...
My checklist would be:
Electrolytic caps - especially if near a heat source.
Open circuit low value resistors.
Open circuit on PCB.

sagarverma · 4th November 2005, 08:24 PM

hey

thepower supply being used is only 500ma.is it possible that such insignificant supply unable to bring up any appreciable change in flux so as to give o/p????

the test corei used earlier was 4cm dia and it worked.i replaced this core but not working.4cm has no crack@all.

4th November 2005, 07:00 PM	#1
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	small crack in torroid!!future of torroid? does a small crack has capability to render torroid useless. the crack is thin but a bit deep.its in inner dia

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4th November 2005, 07:06 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Presumably this is a mains transformer..... As long as no gap exists (causing loss of inductance leading to overheating) there should be no problem IMO. You might be best to clamp it so a gap can't develop. Beware of accidentally creating a "shorted turn" if using a metal clamp arangement.

4th November 2005, 07:17 PM	#4
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	I can't see a crack with this level of resolution.

4th November 2005, 08:02 PM	#7
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	I don't think it will make any measureable difference. Many non-toroid HF cores' fields are completed by sections just touching.

4th November 2005, 08:13 PM	#8
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	but with transformer,my smps not giving any o/p switcher ok mosfets.ok rectifiers,ok only this suspect remaining. its giving me headache bec i spent ten times more than what the req core would have costed(its 14cm,only 5cm max req.)

4th November 2005, 08:19 PM	#9
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	I don't think it could cause no output. Assuming it has worked previously... My checklist would be: Electrolytic caps - especially if near a heat source. Open circuit low value resistors. Open circuit on PCB.

4th November 2005, 08:24 PM	#10
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	hey thepower supply being used is only 500ma.is it possible that such insignificant supply unable to bring up any appreciable change in flux so as to give o/p???? the test corei used earlier was 4cm dia and it worked.i replaced this core but not working.4cm has no crack@all.

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