differences between Neu Y and delta winds
 

OK, I need to see if i understand how the type of wind effects the neu motors. I will use the 1515 motors, as my example and for questions.I am going to use the 2.5d (1700kv) and the 1y (1500kv) as they are closest in kv and size. Ok, From what i have read, they Y config, is 1.73 times less RPM, but 1.73 times more torque than the Delta wind. If this is so, then will the 1y have more overall power than the 2.5d, even with the close KV numbers? This is so i can see, if i understand How these motors work and to see where my next purchase will go.

The reason i want to know, is I'm planning a racer revo for next year. Racing is out this year due to a move, so i got time to plan and buy right. I need a setup that will pull mid 30's to 40 mph and run for at least 25 minutes (hoping for 30+) I am leaning towards a 1512/ 2.5d (about 2000kv) But am wondering if a Y wind in the same kv would be better. Is there anyone with experience with both Y and D winds? Which could pull a taller gear (Emaxx tranny with 18/51 for finned right now) I am running 1/8 buggy diffs if that helps.
Thanks for any info and if i'm wrong in my thoughts above, Please set me straight

Y has 1.73 times less rpm than the D of the same turn count. So, a 2.5d will have about 1.73 times higher kv than a 2.5y. Any differences are probably due to kv rounding...

I understand that, I was asking if the 1Y would have more power than the 2.5d, Due to the wind configuration. I know the 1.73 is wind to wind. I was asking if the 1y would be more powerful than the 2.5D.

I'm actually planning to use the 1512 for the revo, but Want a flexable setup. One track in my area is 1100'centerline (biggest) and the smallest is around 500'. i want one motor that I can drop a bit on gearing to do the smaller track and go bigger to take advantage of the longer track. This will be on 4s lipo, with a quark 125, I have 2 2s 8000 mah maxamps Lipo's and two 4s 3700 and 2 4s 3300 flightpower Lipo's, the 8000's will be series and the 3700 and 3300 will be paralleled, so i will be running a lot of mah. I also have 2s 5000's and 3700's that can be used for qualifiers to keep weight down. What i'm looking for is efficiency and good torque on 4s lipo (RC Pro limit for battery) I am looking at 2000 to 2500kv on the motor to keep the revs up on the 4s limit. Thanks for the reply

I'm pretty sure the winds don't do anything magical like give you free power, and I'm pretty sure the reason there are a bunch of D and Y wind motor options is to help you pick a motor thats closer to optimum kv for you setup.

You're probably right, I remember reading somewhere, that one seemed to have a timing advance, Not mentioned specifically but one run backwards better than the other. I think the Y wind was the one that would run backwards slower, but not sure. Thats why i was asking about the efficiencies of both

Most motors come wired delta from the factory (at least Lehners do), so I'm pretty sure this is the more universal wind type. I'd go for a delta wind if possible, though I think in the end KV is KV, no matter the wind.

there was quite an interesting thread about the Wye and Delta on rc-monster.

The main differnce between wye and delta is that a wye with x number of turns is basically the same as a delta wound motor with 1.73x turns, so a 1.5d will be a little faster than a 1y.

In theory wye is more efficient than delta.

A wye wound motor fires two phases in series to each other at one time with current going in opposite directions. One coil attracts the rotor, and the other repels the same pole.

A delta wound motor uses all three phases at once (one in series by itself and the other two are connected in a series with current opposite to the phase by itself). I can draw a picture if you would like.

So the wye only fires two phases as opposed to three for the delta? It would certainly make sense that it would be a more efficient design, even if only marginally.

Ok then, I want a 1512 to run in my G2R revo. Going by what i want and looking at the specs, I think either the 1.5y (1900kv) or the 2.5d(2000kv) or the 2D (2600kv) are the most logical choices. What are people's experiences with each motor, in a 9.5 to 10 pound Monstar truck with 4s lipo? I know the 2D(2600kv might be a bad choice But its the next step up in KV on mikes inventory

For reference, The current setup in the G2R is a 1515/2.5d/f (1700kv) with a quark 125, Emaxx trannyw/gorilla half tranny conversion, 1/8 buggy diffs and strobe w/ 20/51 gearing. I'd rather keep the finned can, but will go smooth if needed for better gearing. Right now, its a beast on 5s, almost too much to handle on the track and no heat issues. With 4s its still snappy but right about the low 30's. I considered taller gearing on the 1515, but almost afraid, I'll have to go too far to see results

I just did some calculations on my setup, I need a 25 tooth pinion to go 35 mph, with the 1515/2.5d. On the 1512/2.5d i can get 34.8MPH on the gearing i got right now. Would the 1512 pull the 20/51? Or would i be better off getting a 2500KV motor and gearing down a bit?

Once again, thanks for the info, its a huge help

http://www.rc-monster.com/forum/show...ight=wye+delta
http://www.rc-monster.com/forum/show...ight=wye+delta
http://www.rc-monster.com/forum/show...ight=wye+delta
http://www.rc-monster.com/forum/show...ight=wye+delta

I was more intrested in people's opinions about each type, but i read the links through and they had good general info. Thank you Serum

Serum, what do you think about combining (and then pruning) the various threads on this subject? And then make it a sticky. Judging by the number of threads on the topic, it might be worthwhile...

Maybe I'm just REALLLLLLY slow, but I just realized something. I always thought that the Neu motors had very low turn counts for the KV value. But I never thought about the fact of the number of poles/slots!

Comparing two delta-wound motors with similar lengths:
- 6XL (kv=2779) and 1515 1.5d (kv=2700)
- 8XL (kv=2084) and 1515 2d (kv=2050)
- 10Xl (kv=1668) and 1515 2.5d (kv=1650)

Seems pretty coincidental that the turn count X number of poles in the neu motor equates to the number of turns of the Feigao for a given kv rating. But the Feigao is 2 turns, so the slots in the Neu must have something to do with it as well?

The nues have 12 slot stators and the feigaos have 3 slot stators so go figure...!

I thought Feigaos are considered non-slotted? The coils consists of "air-cores" with a long metal ring that sits outside the coil. While the Neus have the coils wrapped around a metal core, and the end of that core is in close proximity to the rotor magnets.

Not that it makes much difference in the end, but I'd be curious to know the relationship between slots/poles/turns/kv...