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Old 4th November 2005, 06:00 PM   #1
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Default 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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Old 4th November 2005, 06:06 PM   #2
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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.
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Old 4th November 2005, 06:12 PM   #3
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see the pic
this is the use.
in smps.
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Old 4th November 2005, 06:17 PM   #4
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I can't see a crack with this level of resolution.
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Old 4th November 2005, 06:27 PM   #5
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see these.
i suppose these show properly.core dia 14cm.
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Old 4th November 2005, 06:30 PM   #6
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and this
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Old 4th November 2005, 07:02 PM   #7
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I don't think it will make any measureable difference. Many non-toroid HF cores' fields are completed by sections just touching.
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Old 4th November 2005, 07:13 PM   #8
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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.)
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Old 4th November 2005, 07:19 PM   #9
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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.
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Old 4th November 2005, 07:24 PM   #10
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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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