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Old 11th January 2013, 05:00 AM   #1
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Default Any value in using reclaimed inductors?

I recently acquired some old stage lighting controllers that I have begun to harvest some components from. Among the items are some heavy duty inductors. I'm curious if they have any use in a PSU, say for CLC filtering.

They are air gapped laminated iron E-I cores wound with 4mm x 4mm wire (actually square wire). Has two layers of windings for as near as I can tell a total of only 22 turns. The centre post is 32mm x 32mm. The value seems fairly low, a quick & dirty measurement showed around 77uH of inductance and series resistance is negligible (my meter reading was the same as just the probes shorted together).

Put them to some kind of use or scrap them? Opinions?
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Old 11th January 2013, 10:33 AM   #2
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What you are talking about is probably a line reactor, they are low inductance high current, good for taming charging current pulses on large of line inverters and probably used to reduce dI/dt in a phase controlled lighting circuit. They might work in a low voltage high current supply if they have some gap, in the core.
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Old 11th January 2013, 01:01 PM   #3
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That sounds about spot on considering the equipment these came out of. The chassis had seven slots, six were 4kW drivers each, and one control card. There's definitely a gap for reducing core saturation effects.
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Old 11th January 2013, 01:08 PM   #4
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Gap not only prevents core saturation, also fixes the desired inductance value and then, adjusts current flow in it as also varies it XL.
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Old 11th January 2013, 01:17 PM   #5
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Might be good for... ehm... choke input filter on a couple kW SS amp, or the DC filament supply for a couple transmitter tubes?!

Tim
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Old 11th January 2013, 04:35 PM   #6
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The cores could be useful for a rewind to more practical values...

Chokes are rather non-critical as far as winding.

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Old 11th January 2013, 09:54 PM   #7
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Old 12th January 2013, 12:23 AM   #8
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Large EI cores, worthless?

Or do you mean to say that if you know the original application, then using them becomes more possible?
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Old 12th January 2013, 04:56 AM   #9
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Well we know the original application. The reduction of switching surges for individual 4kW dimmer modules. My question was wether or not could they have any other purpose, or are they largely useless for an audio application. It seems they are or limited use as they sit due to their low value of inductance. They will likely go out with the next pile of scrap. Thanks for the input.
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Old 12th January 2013, 02:15 PM   #10
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Heck, put 'em on eBay if you can. Transformer iron is a terrible thing to scrap!
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