SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Nov 29, 2014, 05:19 PM
Registered User
United States, NY, New York
Joined Oct 2011
103 Posts
Discussion
Kv not matching chart

I just finished winding two hk4025 12n8p motors. Both final kv does not match what i am expecting.

HK4025 12n8p ABCABC I ABCABC , Y 5+5T =500kv
HK4025 12n8p ABCABC I ABCABC , Y 4+4T =630kv

Both winded with 16awg wires
What did i do wrong?
czynot is offline Find More Posts by czynot
Reply With Quote
Sign up now
to remove ads between posts
Old Nov 29, 2014, 05:32 PM
Registered User
United States, NY, New York
Joined Oct 2011
103 Posts
strange. If i select winding to "D" than the rpm closely match my results. But I am doing a Y termination.

So to get 550kv. I need to use 5+4T?
czynot is offline Find More Posts by czynot
Reply With Quote
Old Nov 29, 2014, 05:34 PM
Registered User
manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,387 Posts
Post 6.
manuel v is online now Find More Posts by manuel v
Last edited by manuel v; Nov 29, 2014 at 07:01 PM.
Reply With Quote
Old Nov 29, 2014, 05:39 PM
Registered User
manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,387 Posts
First, What is the original wind
manuel v is online now Find More Posts by manuel v
Reply With Quote
Old Nov 29, 2014, 05:59 PM
Registered User
United States, NY, New York
Joined Oct 2011
103 Posts
orginal scorpion hk4025-630kv has 6.5+6.5T Delta.

I brought two 4025-630kv for rewinding. Both winded with same wires, same winding and terminations.
motor1. 4+4T give me 630kv
morot2. 5+5T give me 504kv

I selected "Y" in the calcuator. I follow that chart but does not match.
czynot is offline Find More Posts by czynot
Last edited by czynot; Nov 29, 2014 at 06:20 PM.
Reply With Quote
Old Nov 29, 2014, 07:00 PM
Registered User
manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,387 Posts
The value of 630 Kv you feed the TC is the value given by the manufacturer.
630 to turn x 13 slot., (6.5,6.5 tooth)
Equivalent to 591 for 8 turns
And 473 for 10 turns.

Most likely if you had done a measurement of Kv * volt, this would be different.

Now that you have your motor to 10 turns for slot, (5,5) in Y terminartion
and mark the measurement of Kv 500, we have in TC:

For 13 T D, (6.5,6.5) = 666 Kv.
For 8T, Y, (4,4)= 625 Kv.
and 10T,Y, (5,5)=500 Kv. measured.
manuel v is online now Find More Posts by manuel v
Reply With Quote
Old Nov 29, 2014, 09:13 PM
Registered User
United States, NY, New York
Joined Oct 2011
103 Posts
Thank you. Manuel

I was a bit confuse what to enter in the yellow field in the calulator.

5+5T=473kv
So to get my 550kv. I should really do a 4+5T Y?

Sorry for the newbie questions. This is my first wind.
Both motor spool up smoothly.

My next wind will be a HK4035-500kv 12n10p.
what kind of wind and termination should i use for Torque. I will want to increase the rpm to 550kv also.
czynot is offline Find More Posts by czynot
Reply With Quote
Old Nov 29, 2014, 10:37 PM
Registered User
manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,387 Posts
I would make the wind that is closest to the Kv sought. and wire for better packing available copper.
DLRK, Half DLRK, D, Y,

First measured Kv.
manuel v is online now Find More Posts by manuel v
Reply With Quote
Old Dec 06, 2014, 10:14 AM
Registered User
United States, NY, New York
Joined Oct 2011
103 Posts
My problem may be the way I count the turns. I count the bottom of the stator. If I understand correctly. There is a extra turn when jumping over to the next arm.
czynot is offline Find More Posts by czynot
Reply With Quote
Old Dec 07, 2014, 12:53 PM
Aka: Tom Jenkins
ApexAero's Avatar
Palm Beach County, Fl.
Joined Aug 2008
4,507 Posts
czy, did a 12n8p 4025 5+6 and only got 1100 /kv. am presently re doing it to 8+9 1.2mm for a 530 to 550Kv abcabc/abcabc . I 'm a lefty is why its is counter clockwise.
ApexAero is offline Find More Posts by ApexAero
RCG Plus Member
Last edited by ApexAero; Dec 07, 2014 at 01:24 PM.
Reply With Quote
Old Dec 08, 2014, 05:54 AM
Registered User
Fourdan's Avatar
Antony (France)
Joined Sep 2003
3,016 Posts
Hi
HK 4025 are not anymore on Scorpion System data
I have old archive data for HK 4025 12N8P (ABC)
** HK 4025-740 10T delta (I measured 725 rpm/V)
** HK 4025-630 12T delta (I measured 626 rpm/V)
** HK 4025-550 14T delta (I measured 587 rpm/V)
** HK 4025-890 ?T delta (I measured 874 rpm/V) probably 8T delta

Now there are new HKIII 4025 but 12N 10P (dLRK)
Louis
Fourdan is offline Find More Posts by Fourdan
Reply With Quote
Old Dec 08, 2014, 09:29 AM
Registered User
United States, NY, New York
Joined Oct 2011
103 Posts
HK4025 12n8p motor. I can not get the rpm to match the calculator. I try to wound a 550kv. Calculator say 4 turns each arm. 4+4T I get 630kv. I am guessing I need to do a 3+4 turns to get 550kv.

I think you need to wind 7+7T to get 1100kv. I havent done a 1100kv yet.
czynot is offline Find More Posts by czynot
Reply With Quote
Old Dec 08, 2014, 10:24 AM
Registered User
Fourdan's Avatar
Antony (France)
Joined Sep 2003
3,016 Posts
Hi
czynot you are not clear
I suppose you rewind half // (not all in serial) and Star (Y)
your info
HK4025 12n8p ABCABC I ABCABC , Y 5+5T =500kv
HK4025 12n8p ABCABC I ABCABC , Y 4+4T =630kv
There is no intermediate between 5+5 t Y half //
So no possibility to get 550 rpm/V
You could try "Delta all serial 14t" ABCABCABCABC
But probably another wire diameter/gauge
Louis
Fourdan is offline Find More Posts by Fourdan
Reply With Quote
Old Dec 08, 2014, 01:53 PM
Registered User
manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,387 Posts
SK motor, regularly your winding are diferent, as indicated in your page. ten turns, can be anything, least 10 turns.

All who have tried these motors have had these experiences.

We here Ideally set the winding factor of this motor.
You have to make one easy wire medium with a precise number of turns.
This use as a reference for calculations.

10 turns per tooth, ABCx4 would be easy to do with 22 AWG wire.
manuel v is online now Find More Posts by manuel v
Reply With Quote
Old Dec 08, 2014, 02:31 PM
Registered User
manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,387 Posts
Modisk
http://www.rcgroups.com/forums/showt...ht=4025&page=2

Set your old version 4025 12n 8P motor.
Rewinded to 4turns for tooth, 8turns slot, delta, is 1170 Kv.
And his 5turns for tooth, 10turns slot, Delta, is 940Kv.
both ABCx4./ serial ABCx4.
manuel v is online now Find More Posts by manuel v
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion chart of # of cells,mah,motor size,kv,prop size=watts jasburrito Electric Plane Talk 5 Oct 04, 2009 06:32 PM
Question is there a kv table/chart?? xtremeracer Electric Power Cars 4 Jul 25, 2009 01:00 PM
Discussion EZ Match power systems and charts from CSRC BruceSund Power Systems 4 Jul 17, 2008 02:30 AM
Question Performance charts for Park E-Flite 400 BL inrunner (3700 kv) Zerts Power Systems 0 Jan 16, 2008 11:54 PM
Discussion Does a motor KV comparison chart exist? FWFlyer Power Systems 3 Jul 27, 2007 06:40 PM