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Old 05-20-2011, 05:40 PM   #1
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Default Motor wind/Kv/Y equivalencies

I guess I'm "old school" in that I still tend to refer to motors by their wind and I'm only just getting used to Kv classifications. Is there some sort of comparative chart that would show motor wind/Kv/Y equivalencies or can somebody break that down for me?
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Old 05-20-2011, 05:54 PM   #2
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Are you bashing or racing? Brushless motors can be rated in turns as well as Kv but the turns don't relate at all to brushed motors. I'm sure someone will have a "rough" chart for you.

As a racer I don't worry about Kv ratings as even with brushless motors classes are still defined by turns.
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Old 05-20-2011, 06:14 PM   #3
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I race at a club level and nobody I know is running anything described as anything "Y", but I was doing some research on the 4s 1/8th scale motor / esc that's in development and I noticed the motor rating listed it as a being available in 1.0Y and 1.5Y. Which isn't a configuration I've not heard of before. Like I said, I still think in terms of winds so even Kv throws me a bit so I figure there has to be some way to convert that number to winds. I don't know if it's just marketing or what but sometimes it's hard to keep up.
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Old 05-20-2011, 06:37 PM   #4
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What type and size motors are you looking at/talking about? 1/8th scale stuff designed for 4s and 6s applications?
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Old 05-20-2011, 07:25 PM   #5
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Here is the novak chart:

http://www.teamnovak.com/products/br...spec_chart.htm

From what I understand the different motor manufacturers translate winds/turns to kv differently.
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Old 05-20-2011, 08:04 PM   #6
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Quote:
Originally Posted by nadan805 View Post
Here is the novak chart:

http://www.teamnovak.com/products/br...spec_chart.htm

From what I understand the different motor manufacturers translate winds/turns to kv differently.
This is because there is no set guideline or rule on how motors are rated or what they can do to get the numbers that they advertise. They simply must meet manufacturing specs set by ROAR. This also realy only per tains to "spec" motors, 21.5, 17.5. 10.5. Anything lower is considered mod, normally, and is more open...

Motors rated and advertised in Kv normaly are not ROAR legal and there selling point is the Kv number no matter how many turns or methods they use to get them.

None of this is relavent to the OP though...
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Old 05-20-2011, 08:17 PM   #7
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ok this is of the top of my head but should be 99% correct
when brushless was becoming popular there was suppose to be a rough equivalent by dividing a brushed by 1.8 ? or so.
usally the brushless had a bit lower rpm at same voltage but a lot more torque.
with the "y" there is two winds that are used generally with brushless motors
Y (wye)
Delta
most of the brushless motors we use in 1/10 on road are Y wind motors
the difference between the two
a Y wind motor will have 1.73 times more torque than a delta wind
the delta wind will have 1.73 times the kv of the y wind.the wye is more efficient than the delta wind
so just say a 13.5 turn Y wind was 3300 kv,the same 13.5 wind in a delta would be around 5700 kv
getting a KV chart for turns is near impossible as each company quote diffrent kv,s for there winds (turns)
but its unknown how each company test there motor kv,s
as its possible to calculate kv on paper,but things like timing change kv.
neu uses a diffrent system,thats when you will see 1.5y or 1.5d etc (wye and delta winds)
but there also sensorless motors
sensored usually show a .5 wind (IE 13.5) were a sensorless will be a full wind 10t etc
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Old 05-20-2011, 08:27 PM   #8
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Ozzy, I've seen a lot of 1/10 sensorless motors that do give a wind rated in half turns too..??..??

If the OP wasn't cunfoosed before he is now spelled that wrong to be funny
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Old 05-20-2011, 09:02 PM   #9
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yea it can be cunfoosing
there has been so many numbers punted around for brushed to brushless equivalents its not funny.
personally i like kv numbers,but this to can be misleading.
i think the difference with full turn to .5 of a turn is comes back to if there core or coreless,but i cant remember lol
there is so much that can change in a motors design,wind,core/core less,poles,air gap not to mention magnet/wire composition,glue.
it goes on and on and is over most peoples head (well mine any way)
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Old 05-20-2011, 10:21 PM   #10
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and everybody thought brushless would make motors simple.. it did for about 6 months..
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Old 05-20-2011, 10:22 PM   #11
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Quote:
Originally Posted by racer1812 View Post
What type and size motors are you looking at/talking about? 1/8th scale stuff designed for 4s and 6s applications?
back to this OP, what do you really need/want to know
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Old 05-20-2011, 11:03 PM   #12
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Quote:
Originally Posted by racer1812 View Post
back to this OP, what do you really need/want to know
Like I said, I was researching the possibility of moving away from a Novak K2s /550 with the 14mm tuning rotor that I'm using it my sc10 4x4, to something like the Novak k4s / Ballistic 8 (when they're available) but I wanted to be able to compare it and similar systems out there to determine whether a 1.0y or higher motor would be sufficient power for this application. Trouble is I can't say I've gotten a better understanding as to how the new Novak system will stack up to Novaks existing gear let alone, the others in the market.

There not even released yet so I guess the point is mute, but I like to try and be in step with the rest of th early adopters -- if not one ahead

But wait... what if I put a couple of those sweet mini jet rc motors on here... nahhh it'll push too much...even for an Associated.


Thanks for the input
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Old 05-20-2011, 11:18 PM   #13
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Quote:
Originally Posted by Redbeard View Post
Like I said, I was researching the possibility of moving away from a Novak K2s /550 with the 14mm tuning rotor that I'm using it my sc10 4x4, to something like the Novak k4s / Ballistic 8 (when they're available) but I wanted to be able to compare it and similar systems out there to determine whether a 1.0y or higher motor would be sufficient power for this application. Trouble is I can't say I've gotten a better understanding as to how the new Novak system will stack up to Novaks existing gear let alone, the others in the market. There not even released yet so I guess the point is mute, but I like to try and be in step with the rest of th early adopters -- if not one ahead

But wait... what if I put a couple of those sweet mini jet rc motors on here... nahhh it'll push too much...even for an Associated.


Thanks for the input
when exactly did you say that?

Novak 2s system vs. the new yet to be realeased 4s 1/8th scale system..not a clue.

Why do you want an 1/8th scale system requiring 4s in this truck anyway?
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Old 05-20-2011, 11:50 PM   #14
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i would say the novak ballistic 1y will be 2200kv and the 1.5y 1500kv
or there abouts,these i would guess are designed for 4s and up applications.
but even on 2s the chances are they would turn your sc 4x4 inside out
there a large motor (43mm) than a 550 (36mm) in diameter,but there a 4 pole motor compared to the 550s 2 pole.
as racer1812 said there 1/8 motors.
if you want a motor with more power then the ballistic 550 then you could try a neu 1415 1D (4100kv) with a mambamax pro
but i would be surprised if a sc10 4x4 could hold up to the power that it could deliver.
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Old 05-21-2011, 12:43 AM   #15
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No reason to be hung up on kv and turn ratings unless your track has limits on what motors you can run

Select the voltage your are planning to run

Select a speed you need from the car

Select a motor / esc combo that will do it without heat issues

If you can fit a 1/8 sized motor into your car go for it, most will perform well on anything over 3s

Cheers
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