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Electric Motors Winding and Repair Electric Motors Winding and Repair Discussion


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Old 02-21-2012, 01:42 PM   #41
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Quote:
Originally Posted by powercroco View Post
scorpion magnets have been described as N50EH.
if they are really N50 a cannot measure, but definately the hold their complete magnetism up to 180C - this have I hested some times.

N40 UH also will be okay of course.
Many thanks!
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Old 02-24-2012, 12:57 PM   #42
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Just rewinded another mx this time for my vibe nex e8 on 12 s, kv worked out 517 on fusionhawk 1.25 wire, 6+7 turns. This i think is a very nice winding for this motor as it has a lot of space for cooling, see pic. Also very easy to do
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Old 02-24-2012, 02:06 PM   #43
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really neat work
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Old 02-24-2012, 10:44 PM   #44
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Thankyou !
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Old 02-25-2012, 06:50 AM   #45
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I envy you Stolla,
My 700MX is still looking wireless at me.
Still waiting for the wire . . .
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Old 02-25-2012, 07:32 AM   #46
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Quote:
Originally Posted by Stolla View Post
Just rewinded another mx this time for my vibe nex e8 on 12 s, kv worked out 517 on fusionhawk 1.25 wire, 6+7 turns. This i think is a very nice winding for this motor as it has a lot of space for cooling, see pic. Also very easy to do
Good winding Hermann, good!
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Old 02-25-2012, 11:28 AM   #47
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Thanks Mauro, you got me into it remember!
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Old 03-10-2012, 04:10 AM   #48
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well I've now been flying both the 1.25 6+7 and 1.32 6+6 in my vibe e8 and e720 rappy and they both run fantastic with great power and very good temps even after hard 3d flights, will jlog them soon and post logs. the fan concept works as well as the pyro,mmmm, they do look alike don't they?
Definitely my favourite motor to rewind at the moment for the 50 to 90 size.
Thanks Ralph for the link you posted on this motor, I'm now gonna do a 3rd one for efp tdr
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Old 03-10-2012, 05:00 AM   #49
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yes - they took the best ideas from their concurrents and recombined it.
now they only have to wind it single strand and they would have the best allround motor in this class on market.
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Old 03-12-2012, 02:02 PM   #50
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Hello guys. Glad to see you all here discussing and re winding motors..
I think i can get a Align 700MX from a local guy in my club. I'm wanting to rewind it,
but i'd like to end up with a KV around 400 to suit my gearing and running 14s on a Synergy E7.
Can you point me in the right direction as to locating wire, what size would work best.
Also the amount of turns to put on it?

thank you very much
chuck
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Old 03-13-2012, 12:54 AM   #51
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Chuck, short question long answer, as for materials can't help much, as for kv if you can't find someone who has done it in that kv the only solution would be to do a test winding with thin wire. I'm going to do a slow kv soon for my efp project and may be in the 400kv range, will post here. I'd estimate wire in the 1 mm range but I have 1.12 so will see how many turns I can cram in. I'd guess 8+8 to 8+9 by my crude calculation will get you in the 400 kv range
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Old 03-13-2012, 11:46 AM   #52
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Thanks for the reply Stolla.. Here is where my ignorance is shining brightly.. What is 8+8 to 8+9 referring to, wInds on each tooth of the stator? I have a lot of reading to do looks like.

thanks
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Old 03-13-2012, 02:08 PM   #53
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yes indeed, welcome to the world of rewinding, read up on our great host powercroco's websites, powerditto.de also this forum is already filed with good info and links. But everything you need to know and more at powerditto!
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Old 03-13-2012, 05:27 PM   #54
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Today I received a 700MX that needs a boost:
KV should be close to original so I plan to do a 7+7YY with 1,25 wire to get some cooling.
The copper surface of the original winding is amazingly low: only 7,6mm^2
With the planned scheme the surface will be 17,2 which is a 125% increase!
Strange that Stolla needs a 6+7YY to get ~510kv? I'm just going to do mine without testing and see where it goes..

The motor came apart quite easily, I expected a lot more resistance:


Bert
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Old 03-13-2012, 11:05 PM   #55
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Hi dekker, I've done 3 windings so far on the mx 550 kv 6+6, 517 kv 6+7, 475 kv 7+7, would be interesting to see what you get on 7+7, btw the 1.32 runs as cool as the 1.25, the fan works fantastic, haven't temped it as you can keep your hand on it after a hard 3d flight on both e720 and e8, 12 s off course.
What heli is it going in to?
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Old 03-14-2012, 01:55 AM   #56
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This one is for a Trex700.
The motors you listed: all terminations are in YY?

If you did one in 6+7YY to get 510kv, it means the original motor needed to have a 5+6D winding to get its 510kv.
The one I took apart definitely had a 6+6D wind. Are you sure your kv measurement is OK, perhaps you are using a very low timing? And you really have 13wires running through each slot? I can't get the pic from post #42 to open for counting myself..
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Old 03-14-2012, 02:31 AM   #57
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they use different statorheights to realise different n spec!
without comparing this, you never will find the right solution

Last edited by powercroco; 03-14-2012 at 03:39 AM..
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Old 03-14-2012, 02:33 AM   #58
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Hi Ralph, I suppose you mean the number of laminations in the stator?
If this is the case it would mean that Stolla got some 'bad' stators.

Bert
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Old 03-14-2012, 03:28 AM   #59
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no, not bad!!!
you can change the n spec by statorheight.

I also have done it here. 37mm instead of 35mm:
http://www.scorpion.powercroco.de/12N10P4237.html

if you make the package shorter, you will get an higher n spec, if you make it longer, you will get a lower n spec.
so you can realize much lower step than via number of turns.
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Old 03-14-2012, 03:42 AM   #60
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Ah yes now I understand. I know n spec is related to stator length but rather not do it with this motor since it has such a nice epoxy coating and I do not need to remove it for extra space.
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