How to determine kv rating

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gkrausz@gmail.com - 17 Mar 2007 16:09 GMT

Hi,
I'm trying to build my own motor and I want to build it for a specific
kv. I know the kv rating is inversly proportional to the number of
windings on the armature, but I can't figure out the relation between
the wire gauge and kv, or it there are other factors which effect this
such as field strength or something else. If anyone has the formulas
that would be a huge help. Thanks.

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Ron van Sommeren - 17 Mar 2007 16:53 GMT

Goedendag,

There is no relation between wire gauge and Kv (or Kt) assuming the wire is
not too thin, then all bets are off. Just do a quick'n dirty wind, say 10
winds, spin your motor with a dremel, measure rpm and voltage between the
phases (meter on AC). Divide rpm by voltage, presto, Kv for 10 winds. Want
double that Kv? Halve the number of winds and vice versa.

Excellent motor building articles by Brian Mulder, a must read, will prevent
you from asking a lot of questions :-)
http://www.southernsoaringclub.org.za/
-> Articles by SouthEasterners.
-> Electric Motors - part 1-5

Do-it-yourself motor homepages, manuals/tutorials, checks and tests in this
motor builders tips and tricks thread. The checks and tests may save you
from FRYING YOUR CONTROLER OR MOTOR. Thread is active, bookmark it for
future reference and subscribe to it:
http://www.rcgroups.com/forums/showthread.php?t=240993 (sticky thread, at
top of subforum)

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, Netherlands
14th. int. electric fly-in, Aug.26 http://home.hetnet.nl/~ronvans

> Hi,
> I'm trying to build my own motor and I want to build it for a specific
[quoted text clipped - 3 lines]
> such as field strength or something else. If anyone has the formulas
> that would be a huge help. Thanks.

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Ron van Sommeren - 18 Mar 2007 14:16 GMT

Goedendag 'Part II' ;-)

Are you building an inrunner or an outrunner??

Excellent motor building articles by Brian Mulder, a must read, will prevent
you from asking a lot of questions :-)
http://www.southernsoaringclub.org.za/
-> Articles by SouthEasterners.
-> Electric Motors - part 1-5

Vriendelijke groeten ;-) Ron

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gkrausz@gmail.com - 20 Mar 2007 15:22 GMT

On Mar 18, 9:16 am, "Ron van Sommeren"
<ron.van.sommeren_curly_thingy_hetnet.nl> wrote:

> Goedendag 'Part II' ;-)
>
[quoted text clipped - 24 lines]
> Paying users do not have this message in their emails.
> Try SPAMfighter for free now!

It's an outrunner

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Ron van Sommeren - 20 Mar 2007 19:07 GMT

> It's an outrunner

No need for diy inrunner links then.

Plenty of help and discussion in
<http://www.rcgroups.com/electric-motor-design-and-construction-361>

Vriendelijke groeten ;-) Ron van Sommeren

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Model Forum / Radio Controlled / Helicopters / March 2007

How to determine kv rating