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Electric Motors Winding and Repair Electric Motors Winding and Repair Discussion


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Old 07-19-2013, 10:28 AM   #61 (permalink)
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Default Re: Dummies guide to...

Will do. My goal (now) is to wind a spare. Scorpion 4020-910kv motor. I need to buy the correct wire for this one and I can get started.

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Sent from my phone, excuse the bad grammar and auto corrections.
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Old 07-19-2013, 10:52 AM   #62 (permalink)
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Default Dummies guide to...

Sounds good. Good luck!


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Old 10-13-2014, 09:15 PM   #63 (permalink)
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I like the KV formula based off known or stock KV mentioned earlier.
I was just tinkering around a bit with it and came up with a few examples


Stock KV x stock Turns / new KV = turns needed for new KV.

For instance my Scorpion 4020-1350 kv motor has 2.5 turns.
If I wanted 1100KV I'd calculate as follows:

Stock 1350KV x 2.5Turns / new 1100KV = 3.06 Turns.
3 turns is exactly what the Scorpion HK 111 4020 -1100 KV has under the hood. Awesome!


2.5 turns per tooth is actually 5 turns per phase and 3 turns per tooth is actually 6 turns per phase. And it still comes out the same if I use 5 and 6 turns in the calculation instead of 2.5 or 3 per tooth.


Also according to the Calculator over at RCgroups which is also based off known KV.
If you want to figure how much lower the KV would be by Terminating Wye instead of current Delta. .577 seems to be their magic number.

1350 KV Delta x .577 = 778 KV in wye termination.
To go from Wye to Delta just reverse it 788 KV / .577 = 13500KV

I'm wanting the same KV out of my 4020-1350 rewind so none of it matters this time around but I did rewind my blown Emax 2215-3800 for lower KV to have a back up 4S motor for my 450 and hope to never need it. I love the Scorpion 2221-10 on 4S.

3800 KV x 5 stock Turns / 3000 new KV = 6.3 turns. I put 6 turns of 22 Aug wire on it but have not tested it yet. Winding is fun but taking a chance on blowing an ESC is another story.

It would be nice if you could run some fuses or something on each phase to protect the ESC during testing.
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Old 10-18-2014, 12:07 PM   #64 (permalink)
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Hello , can you please help me , which is the best scheme for 12N10P motor with YY winding? I am now using this at photo? Is this best?
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Old 10-18-2014, 12:19 PM   #65 (permalink)
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There was some discussion of this in a 700mx thread...

Starts here at post #180
https://www.helifreak.com/showpost.p...&postcount=180
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Old 10-19-2014, 03:38 AM   #66 (permalink)
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Quote:
Originally Posted by krtek2k View Post
Hello , can you please help me , which is the best scheme for 12N10P motor with YY winding? I am now using this at photo? Is this best?
Question: is this calc from Bavaria Direct? if so - how did you get it to both show you YY + the termination?

If i change to advanced it doesn't show me the termination anymore. just asking because i tried to play with it a little to learn how terminations vary with my changes - but cant get it to show them...

Also from my understanding - shouldn't it be AabBCc/AabBCc?

EDIT - Thought about my the last question and i now understand why Ralph's termination was strange to me until now: Ralph is doing AaBbCc, but then he connects start "A" for phase 1 and end "b" for phase 2 etc. by that reversing the polarity of each pair, so it is actually AabBCc...
Therefore AabBCc/aABbcC is correct for traditional termination. (hope it was clear...)
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Last edited by omerco; 10-19-2014 at 02:02 PM..
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Old 10-19-2014, 12:48 PM   #67 (permalink)
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I just noticed that his calculator has a Y/D option in 'advanced mode'. Curious. Looks like a slightly newer version.
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Old 10-19-2014, 01:57 PM   #68 (permalink)
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Yes - and where is it placed?
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Old 10-19-2014, 02:22 PM   #69 (permalink)
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Just follow my steps.
1- http://www.bavaria-direct.co.za/scheme/calculator/
2-12 slots , 10 poles , click advanced
3-write scheme AabBCc/AabBCc
4-voala!!!!!

But what is right?
a- AabBCc/aABbcC
or
b-AabBCc/AabBCc
??????????????????????????????
and why???
two screenshots.
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Old 10-19-2014, 02:41 PM   #70 (permalink)
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Interesting! when i do it in the order you wrote (calculate only at the end) i do get the Y and the termination! very refreshing.

For your last answer - look at my edit to post #66. your first scheme (a) is good. the second is not (b option), unless maybe if you reverse the star wires and the phases on the second motor? but i'm no expert to tell that.
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Old 10-19-2014, 02:57 PM   #71 (permalink)
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Oki , (a) is right , and than i will connect (start A + start A) / (start B + start B) / (start C + start C) is it ok?
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Old 10-19-2014, 03:17 PM   #72 (permalink)
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Yep! remember testing the 2 separate motors first for Kv before you connect the parallel phases.
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Old 01-10-2015, 03:24 PM   #73 (permalink)
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Hello.
Now i have scorpion HKIII 4025-1100kV MIKADO edition, and i cant get stator holder from stator. It is glued well. I tried oven 80 degree celsius for 30 minutes , than freezer for 4 hours. Is here working some working solution? Thank You.
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Old 01-10-2015, 07:21 PM   #74 (permalink)
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Quote:
Originally Posted by krtek2k View Post
Hello.
Now i have scorpion HKIII 4025-1100kV MIKADO edition, and i cant get stator holder from stator. It is glued well. I tried oven 80 degree celsius for 30 minutes , than freezer for 4 hours. Is here working some working solution? Thank You.
k
Freeze it over night and try to press it out while it is still cold. Then, put it back int he freezer and keep trying while it is cold.

Some of them can be a pain in the butt! Freezing works much better than heating for removing the stator. Just keep at it!
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Old 01-10-2015, 10:14 PM   #75 (permalink)
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Freezer temps can vary quite a lot. Some people can't wait for their ice cream to thaw
Suggest checking temp and maybe lowering.
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Old 01-11-2015, 12:17 AM   #76 (permalink)
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Suggest lowering without checking temp
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Old 01-11-2015, 04:17 AM   #77 (permalink)
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Quote:
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Suggest lowering without checking temp
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Old 01-11-2015, 05:45 AM   #78 (permalink)
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was in in freezer 13hours and nothing, at night i have a dream when i done it, but it was only dream
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Old 01-11-2015, 07:00 AM   #79 (permalink)
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Maybe you need one of those Japanese fridges with the flash freeze feature! I have no experience in this but perhaps you need to give it the desert treatment, 12 hours frying, 12 hours freezing. Nothing survives the desert.

http://dreamatico.com/data_images/desert/desert-2.jpg
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Old 01-11-2015, 08:47 AM   #80 (permalink)
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I think scorpion recommended somewhere to soak it in alcohol for 2 days to break the locktite. not sure if i remember correct (?)
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