EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: connor.bisby on January 23, 2015, 11:47:05 am
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i have a Dremel 3000 and yesterday i died on me, i emailed them and they just fobbed me off really saying that they didn't sell the spare stator. well i opened it up and found that one on the wires had blown right on the bottom of the coil. so i come to a conclusion the cutting it off and re doing it would be the best idea. in my haste i forgot about the number of windings needed. So my question to anyone is, can you get a some kind of idea how much wire is there by measuring the resistance in the coil? now i would check this but i'm currently waiting on my multimeter to arrive
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When you get your meter do a simple 4-wire resistance measurement and check what resistance the gauge of wire that is wound there should be and calculate the amount of wire you neet to wind on there.
Otherwise there's no other way than unwinding the second part and counting the windings.
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thanks mate thats what i was worried about haha i tried unwinding the first one to no prevail. will i need an lcr meter meter or will that meter be fine?
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You could also find another motor that runs off the same voltage and is roughly the size and take it's windings off, that's if they're not glued ( the windings ), which they in most cases are ( to reduce rubbing due vibration ).
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well that shows how well Bosch/Dremel are doing on the quality side of things then, thanks for the reply i will look into that.
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Just wind the new wire on till the coil is as full as you can make it without impeding the rotor. You probably will get around 200-300 turns of wire onto the stator. With the new winding slip some sleeving ( glass woven type, use that from inside a dead CFL lamp if you have some around, used on the capacitor leads or the lamp leads) on the inner leadout to stop this occurring again. Wind till full, then use some 2 part epoxy ( slow curing type is best) to lock the new winding into a solid mass along the top and sides to keep it from vibrating loose.
Done that a few times, the turns count is not too critical, provided you fill the winding area fully. A turn more or less is no issue.
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^+1, great idea.
Also while you're at it, don't forget to put a fuse in line with the power cable to prevent such stuff from happening again ( just try not to bodge it too hard ).
I didn't find any power rating so let's say it's 200W / 110V = 1.8 A fuse, assuming you got the 110V version.
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cracking input from everyone there i live in the UK so doubt full on the 110v and cheers sean b i couldnt find anything on the internet that was similar to this and being new to it all i lack confidence so its good to hear someone else has done it.
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you can estimate the thread gauge by winding turns on a rod tightly and counting turns per inch or centimeter and then finding the charts to give you that info..
oh, and you're looking at more like 2-3 thousand turns. good luck with that...
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it took me 3 and a half hours the magnet wire i used was 0.1mm thicker than the original i wrapped it using my finger so that i didn't scratch the coating. so after many cups of tea and an ache in my neck i completed it and it works a peach. i didn't do a video or take pictures but i can, as it may be useful for someone else, it saved me 25 pound/ 38 dollars, ideal. and the added bonus of satisfaction.
thanks for all the advice helped a lot.
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it took me 3 and a half hours the magnet wire i used was 0.1mm thicker than the original i wrapped it using my finger so that i didn't scratch the coating. so after many cups of tea and an ache in my neck i completed it and it works a peach. i didn't do a video or take pictures but i can, as it may be useful for someone else, it saved me 25 pound/ 38 dollars, ideal. and the added bonus of satisfaction.
thanks for all the advice helped a lot.
I've gotta say I'm impressed. Nice job. The satisfaction is worth far more than the 25 quid. For interests sake, may I ask roughly how many turns you ended up with?
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it wasnt in the thousands lol it was 611 to match the resistance slightly less than the other coil but. it works great. still manage the rpm it did before the break.
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image 2
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I'm glad you got it to work. :-+
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thanks mate and thanks for the help