 Inductor with a screw as an core
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Plasmana
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Fri Sept 03 2010, 02:50PM
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Registered Member #3108
Joined: Thu Aug 12 2010, 05:37PM
Location: Worthing, England
Posts: 72
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radiotech wrote ...
Could you test the screw with a small magnetic pickup tool and see if its made of iron?
The screw is magnetic.
Mattski wrote ...
The cynic in me wants to raise a more mundane possibility such as they ran out of ferrite/iron powder cores on the assembly line one day and so they decided to slap in a screw to see if they could keep producing power supplies that day.
Also, does it look like the screw was used as a coilform - i.e. do the turns fit neatly into the screws threads? Could also be that it was a cost-effective way to make a high power low-Q inductor like Mary guessed. I would guess that screws are cheaper than magnetic cores simply by economy of scale.
That makes sense and the coil does fit neatly around the screw!
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radiotech
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Fri Sept 03 2010, 03:22PM
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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
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The screw would never be used as a former. Those heavy wire coils are made on a mandrell that cant damage the enamel. If the core was added as a last moment change it was probably done to clean up some snivet that exceeded the EMI regulation labeling test.
A ferrite core would multiply the inductance and and such a slender
ferrite core would make no sense in that shape of coil. I think mattski is right in that is a botch-up fix, but for different reasons.
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