Damaged coil?

[Flappytango]

Im building center channel and a coil came from partsexpress damaged(right). Not too bad so i called and they sent a new one at no charge but its messed up too(Left). I dont think it will make much difference but i want to see waht others think? should i try to get another or use one of them but which one?
thanks

[5th element]

The one on the left just looks as if the wire has been pushed up a lil bit so is out of shape, just push it back and then use this one.

I have no idea what is actually wrong with the one in the right anyway, unless you are refering to the lil bit of "scraping" kinda semi squashed look of the windings in the top of the coil. In which case I wouldnt have even seen this and thought hey my coil is bust.

Both should work fine.

[Flappytango]

Hey thanks,

I was trying to bent the wires back their pretty ridgig though. Will the small ripple effect its inductace value? the one right has some cobbling in the turns looked like it was dropped on cement.

i know it seems trivial but i dont know theory behind inductance and am not sure how critical these things are.

[KevinLee]

Hello,

As long as none of the laquer (insulation) is worn off the windings I am sure the damaged coil will work as well as the non squashed one.

If you want you could spray some conforming spray on the part of the coil where the windings have shifted. This will stop any further movement or 'ringing' of a loose winding.

I doubt there is a piece of test equipment that could tell the coils apart let alone your ears.

Good luck.

Kevin Lee

[ScottRHinson]

Originally posted by Flappytango
Im building center channel and a coil came from partsexpress damaged(right). Not too bad so i called and they sent a new one at no charge but its messed up too(Left). I dont think it will make much difference but i want to see waht others think? should i try to get another or use one of them but which one?
thanks

I have purchased quite a few of those coils, and they come like that fairly often. Most times looking more like the one on the left, and not quite as bad. I think it's due to them hitting each other during shipping. I've measured the inductance of a couple of damaged ones and they were all just fine. Just as someone said, as long as the insulation isn't damaged, they are fine.

I wouldn't worry too much about it.

Scott

[Flappytango]

Great i wont worry about it then

thanks for the input

[leftnote]

The self-inductance (inductance) of a loop is proportional to the shape/area of the loop and the gauge of the wire used to create it. For a coil mulitply by the number of turns of the coil. Since the "damaged" turns aren't too significant bent and since the ratio of damaged to undamaged turns is very small by the looks of it, I would bet the change to your impedance is measureable but much less than the tolerance of the part.