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Old Apr 30, 2012, 06:47 PM
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I just rewound my 73 gram omega using 30awg wire three strands 9 turnes dlrk 12pole and it worked but I dont know what my kv or anything about how I should prop it can you help?
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Old Apr 30, 2012, 06:51 PM
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homo ludens modellisticus
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I try to maintain this sticky as a FAQ, your question and the answers will be deleted. Better start a new thread for your question, more viewers/anwswers too. Win-win

Vriendelijke groeten Ron
diy motor tipsDrive Calculator
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• Get a life ... get a Watt-meter!!! •
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Old May 15, 2012, 09:40 AM
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Jack
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Turn Calculator 5, Turn Calcultor 6, Simple Turn Calculator

Ron,

A while back manuel_v updated his turn calculator 5 spreadsheet to turn calculator 6 (he added the ABC wind) and posted it to a thread as an attachment. It is in a zip archive because *.xls it is not an file type that is approved for uploading and posting in it's native format.

The original turn calculator thread has died of old age and cannot be posted to any more so I was unable to add TC6 to that thread.

Your sticky would be a wonderful, and I think appropriate even, place to find Turn Calculator 6 (for DLRK, LRK, Half Parallel DLRK, and ABC winds) and also the quicker and easier Simple Turn Calculator (DLRK winds only). I've uploaded them here for your consideration. There are four as of now:

Turn Calculator 5 -

Turn Calculator 6

Simple Turn Calculator

Simple Turn Calculator V2

All of these calculators are *.xls spreadsheets that can be run under M$ Excel or the free OpenOffice.Org Calc softwares.

Jack
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Last edited by jackerbes; Mar 27, 2014 at 12:43 PM. Reason: add title
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Old Aug 09, 2012, 02:30 PM
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low tech high tech
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Quote:
Originally Posted by Ron van Sommeren View Post
Removing windings from used motors.
Saw the 'winding heads' of, warm in oven and pull the windings from the slots. Pictures:
http://www.eschmidt.de/galerie/wicklung/index.htm
dead link
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Old Aug 09, 2012, 05:07 PM
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Things like that happens after seven years
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Old Aug 09, 2012, 06:20 PM
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I know.

I was hoping for replacement with a corrected link or a pointer to other useful unwinding tips, or deletion of the dead link so searches for unwinding info don't land on it as primary.

As well as deletion of my post.

Now these 3 posts.

Thanks!
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Old Aug 16, 2012, 01:31 AM
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Duh
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Quote:
Originally Posted by hankg View Post
Ron,

This question may not have a place on your "sticky" but I can't find an understandable answer so I'm taking a chance. If it's out of place just disregard my question.

What happens to an outrunner when you use more battery cells in series to power it than the number outlined by the manufacturer. I know the rpm increases, and I've been told you can destroy the motor. Why and how does that happen with to high a voltage?

Regards,

Hankg
it's not the increase in rpm or voltage that destroys it but rather the increase of amps/watts pulled from the increased resistance from turning the prop faster. creates heat faster than the motor can shed it causing the coating on the winding to burn off thus shorting the winds out causing more amps until you let the magic smoke out, then it runs no more. typically you can get away with it if you reduce the prop size but sometimes it takes a drastic size reduction and some motors are allready such a high kv that they are allready pushing the heat/cooling curve allready. best to use an amp/watt meter if you are going to play with running higher volts than recommended and remember that it's the watts that burns it up not the amps, it takes fewer amps at higher voltage to get the same watts as higher amps at lower volts. volts times amps equals watts, thats why you have to reduce the prop size so you do not exceed the max watts, thats when the heat gets excessive. hope I haven't confused you more.
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Old Aug 16, 2012, 02:06 AM
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Quote:
Originally Posted by crashawk View Post
... it's the watts that burns it up not the amps, it takes fewer amps at higher voltage to get the same watts as higher amps at lower volts. volts times amps equals watts, thats why you have to reduce the prop size so you do not exceed the max watts, thats when the heat gets excessive.
Crashawk
I can't agree with your statements above. It IS amps that causes a motor to heat up and burn the windings.
Look carefully at this formula: R x I² = copper loss.
R (or Rm) is the resistance in one phase of an outrunner motor. So, amps squared times the Rm is what causes the primary loss in a motor, i.e. the main source of heat.
In outrunners, iron loss is usually much smaller than copper loss and can also be calculated: Io x volts, where Io is the no-load current.

Christo
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Old Aug 19, 2012, 10:57 AM
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hi there, i would like to ask about number of windings, if BL motor specification state 14turns (12 teeth,14 magnets) , does it mean total number of turns on one line (on all 4 teeth), or number of turns on one tooth, please ?
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Old Aug 19, 2012, 10:58 AM
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Turns on one tooth
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Old Aug 19, 2012, 11:13 AM
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i tought so, but im going to rewind turnigy G15 950kV , and im not sure how.
it has 22 x probably 32AWG in one strand , and when counting turns while unwinding it, it has 4 , 3.5, 4, 3.5 turns per tooth. Can`t find any information about this motor on the net, can somebody help me what gauge and turns per tooth i could use to get approx the same kV ? im thinking about 24-20AWG.

stator diameter is 27mm and length is 28mm.
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Old Aug 19, 2012, 11:49 AM
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Usually, number of turns is "per slot", i.e. a 14-turn motor will have 7 turns per tooth. Have you ever wondered why number of turns are always even numbers?

Putting 14 turns on a tooth (for a 14-turn motor) would give a Kv of half the desired value. Don't ask how I know..

Christo
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Old Aug 19, 2012, 12:12 PM
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nope, i never wondered why numbers of turns are alwayz even, because they are actually not.
for example scorpion`s motors - S3014-1040 13turns, S3014-1220 11turns, S3026-890 7 turns.. btw, what is slot ? two adjacent teeth in your example? one wire(phase) goes around 4 teeth on 12 pole motor, isn`t it ?
im sorry about my beginner`s questions, but i can`t find any info about this numbering.
so, in 14T motor, it means 14 turns per tooth, or per slot (two teeth) or per all 4 teeth in one phase ?
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Old Aug 19, 2012, 12:30 PM
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delete me...
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Last edited by jackerbes; Aug 19, 2012 at 07:32 PM.
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Old Aug 19, 2012, 01:07 PM
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Quote:
Originally Posted by xener View Post
nope, i never wondered why numbers of turns are alwayz even, because they are actually not.
for example scorpion`s motors - S3014-1040 13turns, S3014-1220 11turns, S3026-890 7 turns.. btw, what is slot ? two adjacent teeth in your example? one wire(phase) goes around 4 teeth on 12 pole motor, isn`t it ?
im sorry about my beginner`s questions, but i can`t find any info about this numbering.
so, in 14T motor, it means 14 turns per tooth, or per slot (two teeth) or per all 4 teeth in one phase ?
Sorry, I was referring to the older version Scorpion motors, not version-II. Look at this page. All the motors are even-numbered. Obviously, Scorpion are now doing LRK-winds, where only every alternate tooth is wound and therefore the full turn-count can be put on one tooth. Can someone please confirm this.

LRK winds are not very common these days and I have never seen any Turnigy motors being wound this way. Most outrunners are wound dLRK or "distributed LRK" where every tooth is wound with half of the turns of the turn-count.

Yes, slot means the valley between teeth.

Christo
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