700-MX Winding Project

[Sirolf]

@Dekker

That looks an awefull lot like my motor...

[powercroco]

bert,

you also should check the magnet distances.
on your foto they seems to be different.
if yes, this can cause esc problems!

(make a wooden stick, which fits between 2 magnets who look to have the biggest didstance and try, if you can put it between the magnets in every single gap.)

[Stolla]

Ralph you have a keen eye!, what is the best way to remove magnets, both for epoxy and loctite?

[Stolla]

Originally Posted by _Dekker

This one is for a Trex700.
The motors you listed: all terminations are in YY?

If you did one in 6+7YY to get 510kv, it means the original motor needed to have a 5+6D winding to get its 510kv.
The one I took apart definitely had a 6+6D wind. Are you sure your kv measurement is OK, perhaps you are using a very low timing? And you really have 13wires running through each slot? I can't get the pic from post #42 to open for counting myself..

Maybe mine had more stator plates as it was a 470 stock, all are yy and tested on fusionhawk, compared with the powerjazz these readings are actually higher, Maybe align stock kv is suspect dont know, i was certainly concerned as mine was so much different to the one on powerditto but when i compared to my other motors tested on pjazz thy all ran a little higher kv on the hawk.

[powercroco]

I use a scalpell and a small hammer to remove the magnets.

[_Dekker]

Originally Posted by powercroco

bert,
you also should check the magnet distances.
on your foto they seems to be different.
if yes, this can cause esc problems!

No worries Ralph, I measured the spacings and they are all equal within 0,1mm, which is very good.

[_Dekker]

Originally Posted by Sirolf

That looks an awefull lot like my motor...

Hey Sirolf, once again its proven that we live in a small world.

[Stolla]

Originally Posted by powercroco

I use a scalpell and a small hammer to remove the magnets.

Thanks, back to the difference in kv, would it be the assumption that align changes the amount of stator plates between the different kv motors, i.e. 470,510,530, rather than the winding?

[ZuvieleTeile]

Maybe we start counting them. I'll do a count on my 700MX/510 lateron and see what I come up with.
IF someone with a different Kv cold do the same, we could compare and see what they are doing.
Would be interesting.
Btw. still waiting for my Brocott wire. There is something wrong, I think.

[_Dekker]

Here is my 7+7 wind in 1.25mm, 1000V isolation test was perfect.

Front:


Back:


I counted the laminations, this one has 159 plates:

[Stolla]

nice, so what's the kv?

[ZuvieleTeile]

Counted my 700MX 510Kv stator too.
Same as Dekker's. 159 plates.

And btw. I spoke to Brocott today. There was a mix-up with my order.
We got it straightened out and I was even able to add some more wire sizes.
Hopefully I'll have my stuff in a week or so.

[Stolla]

great, been waiting for your motor!, now have to see how many plates on a 470kv? Not gonna take mine apart to count them but hopefully someone else will provide the count.
Let's here what Bert found on kv

[torro]

i don´t think that the stator from 470kv version is different to the 510kv version.

510kv has a 6+6D, i bet that the 470kv has a 7+6

[Stolla]

Most probably you're correct, we're trying to find out why the discrepancy in the motor kv on the ones I did vs the powerditto one, wonder of they perhaps got measuring kv wrong as the difference on kv on the strong magnets were also huge, I mean they dropped 2 turns for similar kv. Would help a great deal to see what kv dekker got.
I double checked my kv readings with other rewinds I've done, they were tested on my powerjazz before, now a black edition courtesy of a 5020 stock motor, on the fusionhawk
readings were a little higher than on pj, so my mx on hawk definitely ran lower on 7+7 than the 510 they got, on pj it would probably be closer to 450.
On the second motor, 6+7 worked out 515 which seems closer to the reading on the stronger mags, so I know at least on the 2 motors I did kv was double cross checked and the calculation of kv between the 2 motors seemed to correlate.
Common Bert help us out with your kv readings!

[Stolla]

Ignore double post please delete

[ZuvieleTeile]

Originally Posted by torro

i don´t think that the stator from 470kv version is different to the 510kv version.

510kv has a 6+6D, i bet that the 470kv has a 7+6

I take your bet!
1 big German beer for the winner.

OT Where in the Black Forrest are you living?

[torro]

20km from Europa Park.
among Freiburg and Offenburg

BTB (back to bet )

i don´t have a 470kv. so don´t cheat while counting...

[_Dekker]

Well, here is a surprise: the motor I wound was labeled as 510kv and I counted 6+6D when I took the old windings off.
To get the same kv in YY I need 7+7 and I just measured both partial motors.....and the kv is 470!

@Zuvieleteile: I think you will loose your bet

[Stolla]

Thanks for feedback Bert, relief for me as I got the exact same on 7+7, are you gonna drop the extra wind to get in the 510 range or leave as is?
At least now we're getting some solid data on the table.
Nice motor for rewinding isn't it?