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Old 30th November 2012, 12:49 AM   #1
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Default What are clips used for on transformer core

Does anyone know why some cores have clips. I thought clips were used to hold the core together, but this picture shows that they may be used to hold the bobbin. But i do not know why the bobbin needs to be held.
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Old 30th November 2012, 01:02 AM   #2
DUG is offline DUG  Canada
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They do hold the cores together and where the core is at 90 degrees to the board they also solder into the pcb for support. (at least the ones I have do)

If you don't have them and don't want to get your bobbin out you can krazy glue your core together.

For a temp solution elastic bands work well.

Waxed nylon string with a self tightening knot is also a good idea.
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Old 30th November 2012, 01:03 AM   #3
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The force used to hold the core halves together, in the product of that photo, is actually supported through the bobbin. The clips get rid of the hand taping step before the glue sets. It's possible to run the cores without glue but it's rarely seen in production and probably isn't a very good idea. A little glue makes sure everything is fixed in place and makes sure no vibration comes from the core halves slapping together. Ideally you'd make sure the outer legs of the core are aligned best as possible but I don't think it ever happens in production.
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Old 30th November 2012, 01:27 AM   #4
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Vacuum varnish in production but I don't know if they glue them first.
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Old 30th November 2012, 05:22 AM   #5
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When glueing the cores, remember that a core runs warm or even hot (80-100C) especially in the surface areas (ferrites are bad heat conductors) due to imhomogenous flux and therefore a heat stable glue is necessary.
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