Rewinding Emax CF2805 & CF2822 - Page 4

annihil8ted · Apr 10, 2009, 01:07 AM

Quote:

Originally Posted by annihil8ted

Sorry, please be patient with me, being in highschool and just starting physics this is all new to me.

If the motor can't handle the prop, wouldnt it burn up? Well i just did a test and not only was it cold, the Watt's Up meter showed that even with 5x5 APC on 3s 1500mah, amp was only 6.5. Im starting to think i got a faulty motor.

so im going to go with 24 gauge wire and 11turn? Will an extra turn help?
Also, im going to terminate in delta since i dont have the skills to terminate wye. Am i still going to get the 17oz performance, or do i have to learn wye?
Did you do DLRK or LRK?

annihil8ted · Apr 10, 2009, 02:04 AM

Also, i can't seem to find the difference between DLRK and LRK.

To me, for DLRK, you do 2 poles and 2 adjacent to that. Then you do one each on the outside of the 2 pairs forming a "x". After that, you just finish the third phase.

LRK is the same except you do 2 poles and its adjacent pole, then you move on to the next and do 2 poles and its adjacent pole and then you finish up doing the exact same thing.

Did i miss anything?

IBCrazy · Apr 10, 2009, 08:47 AM

An extra turn will lower kV, increase kT (torque per amp) and enable a slightly more demanding propeller.

Also, termination will very much affect performance. Delta is 1.7 times faster than a WYE. It also produces 1.7 times less torque per Amp. If you're winding this motor for torque or to spin a larger prop, Delta will not work for you.

annihil8ted · Apr 10, 2009, 02:57 PM

Thanks IBCrazy. I'm going to go with MiseryQ's wind but i need his imput.

MiseryQ · Apr 10, 2009, 05:33 PM

Like said the extra turn will slow the motor.
dLRK has all the tooth wound the wire comes out throught the teeth after the two are finished, I'll have to find timochris' tutorial when I get off my phone.
LRK is good for larger motors not the 2805 from what I was told.
I started a ton of threads about this when I started preparing.

I also terminted Wye. Delta would require more turns plus some say Wye "tracks" better.

Since your wanting to use a 6x5.5 I'm assuming your wanting speed(?).

annihil8ted · Apr 11, 2009, 02:27 AM

I will go with 11 turns of 24 gauge and learn how to terminate wye.
MiseryQ, im assuming you did dLRK and not the regular ABCABC or LRK?
Yeah i want fast and powerful motor using either a 6x4 or a 6x5.5.

MiseryQ · Apr 11, 2009, 02:40 AM

With the tooth and magnet count you can only go dLRK or LRK.
for Wye you simply take every other wireand join them.
The three left over are you leads.

I forgot to look for the link and I'm back on the phone now. Search for threads started by timochris he has a lot of good tutorials.

annihil8ted · Apr 11, 2009, 03:04 AM

thanks MiseryQ, yeah i just reread all of the threads posted on here but i guess they are a little difficult for me to follow. I'm going to use dLRK and for your motor, did you have any parallels?

I still don't get the difference between dLRK and LRK through. I've read through the posts in here about them and I still can't determine the difference.

MiseryQ · Apr 11, 2009, 12:43 PM

Quote:

Originally Posted by annihil8ted

<snip> did you have any parallels?

I still don't get the difference between dLRK and LRK through. I've read through the posts in here about them and I still can't determine the difference.

Huh? What do you mean?

I don't know the performance difference between dLRK and LRK.
I just did some searching and it appears:

1) Some places use LRK and dLRK interchangeably.
2) dLRK may offer and increase in efficiency.

annihil8ted · Apr 11, 2009, 02:13 PM

Thanks. What i meant was did you use a single wire or did you use 2-3 in parallel?
OK finally, i got enough info to start winding.

MiseryQ · Apr 11, 2009, 02:16 PM

Single strand 24awg, 11turns on the 2805.

annihil8ted · Apr 11, 2009, 02:31 PM

Thank you for being patient with me. Ill report back when i finish winding and give periodic reports in between.

annihil8ted · Apr 11, 2009, 04:18 PM

correct me but are there 2 types of FC2805?
from what i have gathered, there is CF2805 and 2 types of FC2805
both the CF2805 and the FC2805 have 2800kv but the other FC2805 has a kv of 1600.

Are my eyes deceiving me?http://www.hobbycity.com/hobbycity/s...3&v=&sortlist=

is it possible the motor isn't defective but i have the other one?

MiseryQ · Apr 11, 2009, 04:48 PM

that makes no difference to your rewind.
theory is one is a delta while the other is a wye.
They both have 15turns of the 3 strand of 30awg.

grumman5277 · Apr 12, 2009, 12:47 AM

I have bought 4 of the 2805's at different times. None have a Kv of either 2800 or 2850 that they claim.I have counted 13T of wire on these and the newer motors are very questionable if used as is. This is due to the use of the black adhesive that is used for the magnets is now being used to secure the stator. They are also pressing wound stators onto the shaft.My wires were pinched on one lead.
Please check carefully before attaching an esc for this problem.

As for my own testing these motors are closer to 2500kv.My 11T dlrk is 2900kv.
This may explain why some are able to swing a 6x4apc on 3s. The amperage would be to high for 2800kv.
Jeremy

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Apr 10, 2009, 02:04 AM	#47
annihil8ted Registered User Join Date: May 2008 Location: San Diego Posts: 424	Also, i can't seem to find the difference between DLRK and LRK. To me, for DLRK, you do 2 poles and 2 adjacent to that. Then you do one each on the outside of the 2 pairs forming a "x". After that, you just finish the third phase. LRK is the same except you do 2 poles and its adjacent pole, then you move on to the next and do 2 poles and its adjacent pole and then you finish up doing the exact same thing. Did i miss anything?

Apr 10, 2009, 08:47 AM	#48
IBCrazy Former North Coast Flyer Join Date: Jun 2006 Location: Lynchburg, VA Posts: 2,011	An extra turn will lower kV, increase kT (torque per amp) and enable a slightly more demanding propeller. Also, termination will very much affect performance. Delta is 1.7 times faster than a WYE. It also produces 1.7 times less torque per Amp. If you're winding this motor for torque or to spin a larger prop, Delta will not work for you.

Apr 10, 2009, 02:57 PM	#49
annihil8ted Registered User Join Date: May 2008 Location: San Diego Posts: 424	Thanks IBCrazy. I'm going to go with MiseryQ's wind but i need his imput.

Apr 10, 2009, 05:33 PM	#50
MiseryQ Registered User Join Date: May 2006 Location: Norfolk, Va Posts: 1,773	Like said the extra turn will slow the motor. dLRK has all the tooth wound the wire comes out throught the teeth after the two are finished, I'll have to find timochris' tutorial when I get off my phone. LRK is good for larger motors not the 2805 from what I was told. I started a ton of threads about this when I started preparing. I also terminted Wye. Delta would require more turns plus some say Wye "tracks" better. Since your wanting to use a 6x5.5 I'm assuming your wanting speed(?).

Apr 11, 2009, 02:27 AM	#51
annihil8ted Registered User Join Date: May 2008 Location: San Diego Posts: 424	I will go with 11 turns of 24 gauge and learn how to terminate wye. MiseryQ, im assuming you did dLRK and not the regular ABCABC or LRK? Yeah i want fast and powerful motor using either a 6x4 or a 6x5.5.

Apr 11, 2009, 02:40 AM	#52
MiseryQ Registered User Join Date: May 2006 Location: Norfolk, Va Posts: 1,773	With the tooth and magnet count you can only go dLRK or LRK. for Wye you simply take every other wireand join them. The three left over are you leads. I forgot to look for the link and I'm back on the phone now. Search for threads started by timochris he has a lot of good tutorials.

Apr 11, 2009, 03:04 AM	#53
annihil8ted Registered User Join Date: May 2008 Location: San Diego Posts: 424	thanks MiseryQ, yeah i just reread all of the threads posted on here but i guess they are a little difficult for me to follow. I'm going to use dLRK and for your motor, did you have any parallels? I still don't get the difference between dLRK and LRK through. I've read through the posts in here about them and I still can't determine the difference.

Apr 11, 2009, 02:13 PM	#55
annihil8ted Registered User Join Date: May 2008 Location: San Diego Posts: 424	Thanks. What i meant was did you use a single wire or did you use 2-3 in parallel? OK finally, i got enough info to start winding.

Apr 11, 2009, 02:16 PM	#56
MiseryQ Registered User Join Date: May 2006 Location: Norfolk, Va Posts: 1,773	Single strand 24awg, 11turns on the 2805.

Apr 11, 2009, 02:31 PM	#57
annihil8ted Registered User Join Date: May 2008 Location: San Diego Posts: 424	Thank you for being patient with me. Ill report back when i finish winding and give periodic reports in between.

Apr 11, 2009, 04:18 PM	#58
annihil8ted Registered User Join Date: May 2008 Location: San Diego Posts: 424	correct me but are there 2 types of FC2805? from what i have gathered, there is CF2805 and 2 types of FC2805 both the CF2805 and the FC2805 have 2800kv but the other FC2805 has a kv of 1600. Are my eyes deceiving me?http://www.hobbycity.com/hobbycity/s...3&v=&sortlist= is it possible the motor isn't defective but i have the other one?

Apr 11, 2009, 04:48 PM	#59
MiseryQ Registered User Join Date: May 2006 Location: Norfolk, Va Posts: 1,773	that makes no difference to your rewind. theory is one is a delta while the other is a wye. They both have 15turns of the 3 strand of 30awg.

Apr 12, 2009, 12:47 AM	#60
grumman5277 Registered User Join Date: Jan 2004 Location: Troy ,OH Posts: 1,439	I have bought 4 of the 2805's at different times. None have a Kv of either 2800 or 2850 that they claim.I have counted 13T of wire on these and the newer motors are very questionable if used as is. This is due to the use of the black adhesive that is used for the magnets is now being used to secure the stator. They are also pressing wound stators onto the shaft.My wires were pinched on one lead. Please check carefully before attaching an esc for this problem. As for my own testing these motors are closer to 2500kv.My 11T dlrk is 2900kv. This may explain why some are able to swing a 6x4apc on 3s. The amperage would be to high for 2800kv. Jeremy