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« on: December 11, 2012, 02:59:04 PM »
arun.sreelakam
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can you guys please help me for rewinding my emax cf 2822 1200Kv motor...
i have a spare one which is damaged(one wire came out from the motor) Bang Head Bang Head
please give me some ideas or informations for rewinding my motor..
i am planning for delta winding with 22g wire but dont know how many turns? Head Scratching Head Scratching
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« Reply #1 on: December 11, 2012, 03:17:06 PM »
rastsaurabh
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This may help you .... I copied from some site.....
change JPG to rar for doc file. in case no success send me your mail id.
Hit reputation button of you get exactly what you asked for .... Grin
CD_Star_diagram.jpg
Re: rewinding emax 2822
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« Reply #2 on: December 11, 2012, 05:35:14 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Can't you count the number of turns while removing?
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« Reply #3 on: December 11, 2012, 07:04:45 PM »
arun.sreelakam
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@rastsaurabh: yaar thanks for the help, but i already read lot about winding methods and types.. i was confused in the no of turns and wire gauge ratio.. Sad  Head Scratching Head Scratching
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« Reply #4 on: December 11, 2012, 07:06:44 PM »
arun.sreelakam
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Quote from: sanjayrai55 on December 11, 2012, 05:35:14 PM
Can't you count the number of turns while removing?

sir i didnt remove the old winding yet so that i can count the number of turns, but will the number of turns varies with respect to the wire thickness..? Head Scratching Head Scratching
anyone done this yet?
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« Reply #5 on: December 11, 2012, 07:08:55 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Should'nt you use the same wire gauge? This is what I have seen electricians rewinding Industrial motors do
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« Reply #6 on: December 11, 2012, 07:13:15 PM »
arun.sreelakam
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but how to know which gauge wire is used?
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« Reply #7 on: December 11, 2012, 07:14:33 PM »
arun.sreelakam
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if i take this to the electrical shop can they find the exact match just by seeing this? will make a try tomorrow.. thanks sanjay anyway... will update the progress...  Thumbs Up Thumbs Up
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« Reply #8 on: December 11, 2012, 07:16:20 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
I'm sure they can. They can even rewind for you. All the best
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« Reply #9 on: December 11, 2012, 07:40:02 PM »
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Arun the doc explans it all..... see some part here....
# of turn calculation

Original field rotation speed * # turns = new field rotation speed * new # turns
Thus:
New Wind = (Original field rotation speed / Desired field rotation speed) * Original # of turns

Again targeting 2200 kV we calculate # turns for 14,10, an 8 magnets

14 magnets - (7609/15400) * 16 = 7.9 - We'll round it to 8 turns
10 magnets - (7609/11000) * 16 = 11.05 - We'll round to 11 turns
8 magnets - (7609/8800) * 16 = 13.8 - We can estimate about 14 turns.

Calculate Rm

Copper loss may be estimated by two methods:

Method #1: New Rm = ((New # turns/ Original # turns) * Original Rm) / (1+ % fill change)
Where % fill fill change is an estimate of how much more or less filling of copper you plan on fitting in the stator. This can be calculated or just estimated.
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« Reply #10 on: December 11, 2012, 08:58:51 PM »
arun.sreelakam
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@rast saurabh: yaar actually i didn see the text file yet.. now i am unable to view it.. Sad
cant change the the extension to rar..  Help Me
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« Reply #11 on: December 11, 2012, 10:29:15 PM »
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Go through this thread Lot of tips and info on rewinding a brushless.

http://www.rcindia.org/electric-power/can-this-bldc-motor-be-repaired/
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« Reply #12 on: December 12, 2012, 10:19:19 AM »
rastsaurabh
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Dear Arun,
Down load / save as on your computer desktop first.

post that change the jpg extn to  .rar.

then try opening.
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« Reply #13 on: December 12, 2012, 11:08:55 AM »
arun.sreelakam
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Quote from: sundaram on December 11, 2012, 10:29:15 PM
Go through this thread Lot of tips and info on rewinding a brushless.

http://www.rcindia.org/electric-power/can-this-bldc-motor-be-repaired/
sir great link.. gonna start my winding on saturday.. will upload the progress.. as this is my first ever attempt need all of ur help..   Huh? Huh?
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« Reply #14 on: December 12, 2012, 11:13:51 AM »
arun.sreelakam
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Quote from: rastsaurabh on December 12, 2012, 10:19:19 AM
Dear Arun,
Down load / save as on your computer desktop first.

post that change the jpg extn to  .rar.

then try opening.

man tried it a lot of time.. dont know unable to open(may be my mistake).. can you please send the rar file to my mail..  Bang Head Bang Head
arun.sreelakam@gmail.com
thanks for the help dude..
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« Reply #15 on: December 12, 2012, 11:14:54 AM »
rastsaurabh
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Sent on your mail..
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« Reply #16 on: December 12, 2012, 11:29:31 AM »
arun.sreelakam
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saurabh got it thanks a lot...
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