ESC desoldering! AHHHHHHH

[Brushless55]

I'm having an issue with my DF33
my motor wires are soldered directly to the esc to eliminate the resistance of bullets...

my setup is a Leopard 4092 2080kv on a X447/3 and M545 with 7.5* timing
things seem ok when I use 5000mah 4s2p 40c packs but when using 5000mah 4s2p 50c packs, two of my motor wires desolder after 2 1/2 to 3 laps...

motor temps are only 120-125*F and esc temps are the same


help...

[lenny]

What make are the 50c packs and are they soft or hard pack ?

[Brushless55]

What make are the 50c packs and are they soft or hard pack ?

they are soft packs...
only ran to about 80% after those few laps...

[Fluid]

Water cooling will do nothing to reduce resistance in the solder joints. Apparently the soldered joints have very high resistance. I'd go back to connectors, you can often get a better solder job (more wire contact area) with decent sized bullets than wire-to-wire. The lower resistance packs (50C) are giving up more current, which means more heat in your high-resistance solder joints. Makes perfect sense.




.

[Brushless55]

kinda what I was thinking, less material to flow current.....
maybe I could strip out more wire, then flatten out the wire before soldering
cuz I just relized how little wire is touching the other two leads...

[Alexgar]

Cool setup that's kind weird everything looks good to me

[RaceMechaniX]

I would suspect you have cold or poor solder joints. The high resistance builds heat and it then becomes easy for the joint to come undone. Try exposing more of the motor leads and use a good iron and good solder. The more contact the wire has with the PCB pad the better conduction will occur and less heat will build up.

Tyler

[Brushless55]

the solder joints are about as perfect as it gets... no cold joints at all...
I'm really beginning to believe I did not have enough exposed wire to begin with...
so possibly not enough contact with the esc to begin with?

[drwayne]

The esc solder pads have through pcb holes for the output cables
Move the esc closer to motor, and pass motor wires through the pcb gates, solder around the wire for total circumference conduction.
Better contact and conductivity than what you experience now.

Agree with suggestion the side soldered wires have insufficient contact.

best of luck !
W

[Brushless55]

The esc solder pads have through pcb holes for the output cables
Move the esc closer to motor, and pass motor wires through the pcb gates, solder around the wire for total circumference conduction.
Better contact and conductivity than what you experience now.

Agree with suggestion the side soldered wires have insufficient contact.

best of luck !
W

nice one man!
I'll see if I can get the wires to pass through..
I think the holes in the esc bord are to small for the wires..

[tryinotocrash]

Are there different temp solders? I would check and see if you could get something with a higher melting point?

[puttekula]

Are those wires from the motor shortened?

[drwayne]

ah @brushless 55
shorter wire length is better.
Physical degradation of the solder by vibration fatigue may also explain why them seem to desolder... those long wires would induce a nasty effect to the joint
The pcb holes suit AWG12 cable, your motor cables should 'squeeze' in.
egs
W

[motorfixer1]

Did the section of wire that you soldered on to the esc already have solder on it fron the factory?

[Brushless55]

Are those wires from the motor shortened?

no...

ah @brushless 55
shorter wire length is better.
Physical degradation of the solder by vibration fatigue may also explain why them seem to desolder... those long wires would induce a nasty effect to the joint
The pcb holes suit AWG12 cable, your motor cables should 'squeeze' in.
egs
W

what long wires?
The wires are actually shorter than the esc...
plus way shorter than the original esc wires to
this setup has a total of 6 laps on it, there is no degradation..