Mavic Pro Motor Mod

beanbubba · May 19, 2018

FYI - here is the DJI serial number lookup tool: DJI SERIAL DECODER

milchoni · May 19, 2018

beanbubba said:
FYI - here is the DJI serial number lookup tool: DJI SERIAL DECODER

12 December 2017

chazz · May 19, 2018

Model: Mavic Pro, build on: 13. June 2017

chazz · May 19, 2018

beanbubba said:
After the initial build I received ESC errors but I used the factory motor wiring that was a smaller awg. I went ahead and rewired the whole bird with new 22 awg wire to match the p3 motor leads. I am still getting the errors and at a standstill not sure what else to try at this time.

Anyone have ideas here??

NOTE:

The p3 motor has black/yellow/red wire leads. I only had black/white/red wire on hand.

I wired like this (motor to bird):

black to black
yellow to white
red to red

I hope this is simply wired incorrectly and someone will skool me

View attachment 38248 View attachment 38249 View attachment 38250

It looks correct..

chazz · May 19, 2018

milchoni said:
Sad. I tried with just one motor attached and got the same error. Then resoldered the 3 wires with different combinations and nothing...

Did you cut the last few mm of wire off the motor leads? When they're new they have tin, or whatever it is, at the end of the wire that is hard to solder and needs to be cut off...You should see 2 copper strands...The attachment is a pic of how i first tested to see if it would work...

milchoni · May 19, 2018

chazz said:
Did you cut the last few mm of wire off the motor leads? When they're new they have tin, or whatever it is, at the end of the wire that is hard to solder and needs to be cut off...You should see 2 copper strands...The attachment is a pic of how i first tested to see if it would work...

They are used motors from a friend of mine. When starting up I hear cliks and the 3 original motors plus the phantom one are moving slightly as it shoud be. But when I activate the motors to take off only the three original motors start spinning and an error occurs. It happens every time no matter in what order the wires are soldered.

chazz · May 19, 2018

That's unfortunate. Is the error the same as beanbubba's? I would still cut the end to make sure its a clean solder joint...I hope others test this mod to see if it works for them and maybe help get to the bottom of this...

chazz · May 19, 2018

Not saying this has anything to do with either of your problems and it very unlikely but i would like to mention this...The only time I've ever gotten an esc error was on the phantom pro after replacing a motor. I soldered a little too hot and it caused the solder to splash. After looking over the board with a magnifying glass i notices the smallest piece of solder between two pins of an eprom. I picked it off with an X-acto knife and the esc error when away. I got very lucky finding that because it was barely visible.

milchoni · May 19, 2018

I am runing 01.03.0400 flashed with No Limit Dronez tool. I have NFZ and Altitude removed, Normal+ and Sport ++ mode.
After missing the success this morning with Phantom motor I upgraded to original 01.04.0300 FW. I’ve cut the wires about 1 cm and resolder the phantom motor. And still the same error.....

beanbubba · May 19, 2018

chazz said:
Not saying this has anything to do with either of your problems and it very unlikely but i would like to mention this...The only time I've ever gotten an esc error was on the phantom pro after replacing a motor. I soldered a little too hot and it caused the solder to splash. After looking over the board with a magnifying glass i notices the smallest piece of solder between two pins of an eprom. I picked it off with an X-acto knife and the esc error when away. I got very lucky finding that because it was barely visible.

Well, got a magnifying glass out and sure enough I found 2 tiny solder beads that splattered onto other connectors on the board. I carefully plucked them out, but still no love. I will keep examining for more solder debris. Good call chazz.

beanbubba · May 19, 2018

chazz said:
Did you cut the last few mm of wire off the motor leads? When they're new they have tin, or whatever it is, at the end of the wire that is hard to solder and needs to be cut off...You should see 2 copper strands...The attachment is a pic of how i first tested to see if it would work...

Yes, I cut the ends of the motor leads off.

beanbubba · May 19, 2018

Just figuring out this 3d printer. I think I will take lolo's advice and print the entire rotor arm.

Baby steps...

milchoni · May 20, 2018

Beanbubba did you get rid of esc error? I think it’s impossible.

beanbubba · May 20, 2018

milchoni said:
Beanbubba did you get rid of esc error? I think it’s impossible.

I did not. I am rebuilding a platinum that had a bad gps and compass and trying again on this new bird.

lolo780 · May 20, 2018

I think both motors are 14 pole. If someone has both handy right now to count?

Maybe no load current difference?

beanbubba · May 20, 2018

Printing this now... for 3 hours.

milchoni · May 20, 2018

lolo780 said:
I think both motors are 14 pole. If someone has both handy right now to count?

Maybe no load current difference?

They are both 12.

chazz · May 20, 2018

I just tested this and all i can say is anyone testing lion batteries and having compass errors this is a must have... It worked awesome..Not one compass error on a 4s6p lion battery test..Not even close to an error...The shape of this can definitely be improved and the caps are worth nothing and you're better off without them... If anyone decides to work on an improved more aerodynamic shape post it here please..I won't be doing that in the near future because it works more then good enough for me...I attached the 3d print drawings and the extension cable can be found here.

https://www.amazon.com/gp/product/B075XRFPJB/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

beanbubba · May 20, 2018

Attached are the rear arm 3d print files if anyone wants them. They actually weigh a little less than the factory arm plus chazz's original adapter. I tried to break it with my hands pried over my knee and it held together. Maybe someday investigate making it lighter, but thats not important until we fully vet the solution first.

beanbubba · May 20, 2018

beanbubba said:
Attached are the rear arm 3d print files if anyone wants them. They actually weigh a little less than the factory arm plus chazz's original adapter. I tried to break it with my hands pried over my knee and it held together. Maybe someday investigate making it lighter, but thats not important until we fully vet the solution first.

View attachment 38354
View attachment 38355

Wait a minute, don't print those arms. I changed the motor mount and just got it off the printer and it will break with hand strength. I will fix it and post new files later tonight.