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Old Sep 15, 2010, 06:52 AM
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Help!
Parallel Connection 9N6P (help)

I'm rewound a 9N6P motor and need the schema of connections to parallel groups (YYY) like the figure.

Already my thanks.

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Old Sep 15, 2010, 08:18 AM
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Until I can understand they are three motors in wye terminated, connected
parallel.

Is that so?
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Old Sep 15, 2010, 10:05 AM
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Quote:
Until I can understand they are three motors in wye terminated, connected
parallel.

Is that so?
That's what it looks like to me on the colored diagram in your second post, but I'm new to winding and any motor theory. If you got that image from the powercroc site, then I would guess it's correct.
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Old Sep 15, 2010, 10:42 AM
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So.. you are using parallel connections to avoid multi wire winding ??
Out of curiousity what motor? Ialso have a Turnigy 26/27 3800(?) kv , 20mm x 10 mm, 9 pole stator with 6 mags on my work bench currently
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Old Sep 15, 2010, 12:14 PM
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Quote:
Originally Posted by Stall'n_N_Haulin View Post
If you got that image from the powercroc site, then I would guess it's correct.
The site there is no figure illustrative of the scheme. I did this myself, trying to understand how it would be.


Quote:
Originally Posted by Bare View Post
So.. you are using parallel connections to avoid multi wire winding ??
Out of curiousity what motor?
Itīs a 3800kv heli motor, yes. I wound it using multi strand wires, delta connection and result is:

Teste motor Pylon (0 min 38 sec)



Another question:

The powercroco page, in YYY group parallel the number of turns is doubled over ABC delta.
What is the relationship between the two modes kv?
My original motor is 6T Delta = 3800kv.
In YYY parallel is 12T to be the same kv ?
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Old Sep 15, 2010, 04:22 PM
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It's MY understanding that a parallel connection is to avoid the trouble of winding with multi strands.. and getting good copper fill as well.
ie: a 22 turn in parallel = 11 turns of 'normally' connected winds. Therefore one can use more winds of a thinner easier to wind wire rather than a V thick hard to wind and difficult to fit wire. All this to get the maximum amount possible of copper on the stator.. Lots of winds / copper, halved wire resistance and max copper filll... without changing KV.
A clever trick.
My motor is a Heli one but it's being relocated to an EDF The factory windings are so bad they look like they were put on by a 5 yr old.
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Old Sep 16, 2010, 12:42 PM
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nexus665's Avatar
Vienna, Austria
Joined Jun 2008
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Hi,

Ralph Okon at powercroco.de has a couple of pages online dealing with parallel motors like YY, DD, or even YYY/YYYY configurations, but AFAIK they're only available in german.

The relationship is as follows:

Y = rpm factor 1
D = rpm factor 1,73
YY = rpm factor 2
YYY = rpm factor 3
DD = rpm factor 3,46
YYYY = rpm factor 4

So, to go from a D configuration to a YYY one -

X windings / 1,73 * 3 = target winding count

Hope that helps

BTW yes, in a 9n6p YYY configuration, your diagram above is correct. All same-colored wires need to be connected in parallel, those go out of the motor to the ESC, and on the other end (inside the motor) of the same wires, all 3 colors need to be connected.

Regards,
Simon.
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Old Sep 16, 2010, 12:55 PM
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Quote:
Hope that helps
Not my thread, but it helped me out! Hadn't seen the page on rpm factors. Thanks.
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Old Sep 16, 2010, 01:06 PM
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Very helpful, Simon.

Thank you.
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Old Sep 16, 2010, 08:38 PM
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Go back to the powercroco site and look up the rewind of a Scorpion motor to parallel, its Very interesting :-)
IMO your wee heli motor has much less copper in it than it could (should ?) have.
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Old Sep 17, 2010, 06:35 AM
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This motor of the video rewounded up like the original.

The new winding, 13T 24Awg, parallel YYY, below.
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Old Sep 17, 2010, 10:32 AM
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those windings are very neatly done.
So that's effectively a 6.5 turn wind ;-)
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Old Sep 20, 2010, 03:06 PM
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I just now finished MY rewind (turnigy 2627 3800kv... It had 9 turns Delta of 5 strands of 32? ga wire... it looked more like a plate of spaghetti than windings. Worst job I've yet seen) was gonna do a parallel But experimenting proved i could (just) get 8 turns of 21 ga on it...a serious copper fill. It took Several hours of effort though.
Delta was enough connections/insulation scraping trouble .. this was/is a 20 x 10mm Stator. Tiny!.
It works V well indeed. NOW I need to source some "real" bearings.
No data yet
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Last edited by Bare; Sep 20, 2010 at 03:13 PM.
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Old Sep 22, 2010, 01:07 PM
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Amherst, VA
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Quote:
Originally Posted by Bare View Post
those windings are very neatly done.
So that's effectively a 6.5 turn wind ;-)
Actually, it's a 4.3 turn equivalent. 3 sets of parallel coils. You should note that parallel connections can lead to circulating currents, so I always wind mine Wye to keep the circulating currents to a minimum.

I do a lot of parallel winds and they work very well. The problem is terminating the leads
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Old Sep 22, 2010, 02:09 PM
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Originally Posted by IBCrazy View Post
Actually, it's a 4.3 turn equivalent. 3 sets of parallel coils.
You right !

Factory motor = 6T delta = 6/1.73 = 3.46T Wye

3800kv * 3.46 = 13148 constant

13148 / 4.3 (new winding) = 3057kv (aprox.)

Special thanks to Simon (nexus665).

My Slipso400 is ready to fly

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