Jump to content


Photo

Brushless motors. KV rating Vs Turn rating


  • Please log in to reply
11 replies to this topic

#1 PAIN

PAIN

    Toyz RC Guru

  • Official Toyz Members
  • PipPipPipPip
  • 910 posts
  • Gender:Male
  • Location:SoCali

Posted 17 March 2009 - 03:52 PM

Some BL motors are listed with the KV rating, while others are listed with the amount of turns. Is there some formula that you can use to take the amount of turns and convert it to a KV rating?

#2 DA1378

DA1378

    Platinum Level Toyz Member

  • Members
  • PipPipPipPipPipPipPipPip
  • 4,719 posts
  • Gender:Male
  • Location:ohio

Posted 17 March 2009 - 04:08 PM

QUOTE(PAIN @ Mar 17 2009, 03:52 PM) <{POST_SNAPBACK}>
Some BL motors are listed with the KV rating, while others are listed with the amount of turns. Is there some formula that you can use to take the amount of turns and convert it to a KV rating?


Thisis stuff you more than likely already know but...
Turns means how many times wire is wrapped around either the armature, or can, in brushless's case
KV is revolutions per oh crap my brain just went dead. Per volt, or per cell. something liek that haha.
So i would imagine that you would not be able to figure something out using one to find the other.
Because you can find many combinations of them. I.E. 4300kv 9t. or 5700KV 9t. Or 12 turn 4300KV.
I'm no RC braniac. but thats how i believe those things go smile.gif
~Brock~

#3 frankfka

frankfka

    Platinum Level Toyz Member

  • Official Toyz Members
  • PipPipPipPipPipPipPipPip
  • 3,512 posts
  • Gender:Male
  • Location:vancouver,bc,canada

Posted 17 March 2009 - 05:34 PM

the KVs are the RPM created with each Volt of your battery

#4 Brushless all the way

Brushless all the way

    Toyz RC Freak

  • Official Toyz Members
  • PipPipPip
  • 239 posts

Posted 17 March 2009 - 06:59 PM

if you have a 4000kv motor thats how may volts you get on 1 v just thought that might help a tiny bit

#5 Brushless all the way

Brushless all the way

    Toyz RC Freak

  • Official Toyz Members
  • PipPipPip
  • 239 posts

Posted 17 March 2009 - 07:00 PM

Fundamentally there is NO conversion. It is two entirely independent ways of rating a motor.

Turns are strictly the construction. KV is an indicator of the no-load performance.

Rather like trying to compare two car engines, one based on capacity, the other on the maximum RPM.

Depending on the way a motor is wound, the magnets and other parts, its KV can be significantly different.

For regulated racing, the KV is meaningless - most most motors that are listed with KV only are not built to the ROAR specs anyway.

#6 Brushless all the way

Brushless all the way

    Toyz RC Freak

  • Official Toyz Members
  • PipPipPip
  • 239 posts

Posted 17 March 2009 - 07:09 PM

heres a rough guide by novak
http://www.teamnovak.com/products/brushles..._spec_chart.htm


#7 PAIN

PAIN

    Toyz RC Guru

  • Official Toyz Members
  • PipPipPipPip
  • 910 posts
  • Gender:Male
  • Location:SoCali

Posted 17 March 2009 - 07:43 PM

Yes, I know what turns signifies as well as what KV signifies. I just wanted to know if you could tell the KV based on amount of turns the motor has, and the answer is apparently no.


Thanks for the link brushless.

#8 madmax22

madmax22

    Pancakes

  • Official Toyz Members
  • PipPipPipPipPipPipPipPipPip
  • 6,234 posts
  • Gender:Male
  • Location:Lake wallenpaupack, PA

Posted 18 March 2009 - 12:03 AM

prob. not. I like going by turns better then KV because you get more options. I think the VXL motor is 9T if im not mistakin'?

#9 frankfka

frankfka

    Platinum Level Toyz Member

  • Official Toyz Members
  • PipPipPipPipPipPipPipPip
  • 3,512 posts
  • Gender:Male
  • Location:vancouver,bc,canada

Posted 18 March 2009 - 01:04 AM

a def no there are I think 9T 5400kv and the EZrun 9T 4370kv motor. the two are almost different things

#10 Mohillbilly

Mohillbilly

    The Pimp Daddy

  • Official Toyz Members
  • PipPipPipPipPipPipPipPip
  • 3,367 posts
  • Gender:Male
  • Location:Springfield, Mo

Posted 18 March 2009 - 02:09 AM

Not really, now I have custom wound many R/C plane out runner motors and you can get a very general idea.  The less turns = higher KV and less torque.  However with brushless there is so many ways to wind them, delta, star, Lark, reverse Lark, and others.  If I wind a 12 pole outrunner in delta @ 20 turns I get about a 1800 kv motor, but if I change the termination to star then the same motor @ 20 turns would be 1/2 that so would rate about 10 turns and run around 2600kv.

So sorry to say it would be way to hard to compare.

#11 DA1378

DA1378

    Platinum Level Toyz Member

  • Members
  • PipPipPipPipPipPipPipPip
  • 4,719 posts
  • Gender:Male
  • Location:ohio

Posted 18 March 2009 - 02:12 AM

QUOTE(Mohillbilly @ Mar 18 2009, 02:09 AM) <{POST_SNAPBACK}>
Not really, now I have custom wound many R/C plane out runner motors and you can get a very general idea.  The less turns = higher KV and less torque.  However with brushless there is so many ways to wind them, delta, star, Lark, reverse Lark, and others.  If I wind a 12 pole outrunner in delta @ 20 turns I get about a 1800 kv motor, but if I change the termination to star then the same motor @ 20 turns would be 1/2 that so would rate about 10 turns and run around 2600kv.

So sorry to say it would be way to hard to compare.


ENGLISH MAN ENGLISH!! j/k sound like you know your electrics inside out and upside down.
i know who to bug if i have questions smile.gif
~Brock~

#12 hpiownzilla

hpiownzilla

    Gold Level Toyz Member

  • Official Toyz Members
  • PipPipPipPipPipPipPip
  • 2,410 posts
  • Gender:Male
  • Location:boise,idaho

Posted 18 March 2009 - 09:20 PM

im not sure how the ratio between T's and KV ratings go but usually when you have a BL motor and a says 5.5 T's( im using 5.5 as an example and be any rating) its usually sensored when you get a KV rating like 6800k its usually unsensored




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

BoHeGeHa Dark Blue 2.1.1 Thomas Yugar (Chemical Chaos)
Official upgrade for IPB 2.3.x © Michael ( Dev Fuse )
3.X © Upgrade by Dumbledore ( Tppskinning )