Can high P gain on both Pitch and Roll cause motors to heat up

pid
betaflight
multirotor
fpv

#1

To test the problem I flew my quad during lunchtime and I noticed that all 4 motors where heating up.I thought its because of the sun was up the ambient temperature was just to high. To prove that the main culprit is ambient temperature I flew during the golden hour when it was cold. You would expect the motors to run cooler but still it had the same temperature as it did when I was flying during lunchtime. I also went ahead check to see if the screws were touching the coils and all of them were free from contact.The D gain that I had was about 25 which is lower than the stock PIDs. I had my P gain of 80 on roll and 90 on pitch and it was overshooting(bounce back) before I experience P gain oscillations on both pitch and roll. At 85 on roll and 95 on pitch then it started to show oscillation.The catch is that when I landed the motors were close to being way too hot to touch. Additionally, when I fly using the stock pids its feel is close to locked in and motors are ever so slightly warm to touch.

My setup
Emax RS2205s
DYS blheli s multishot
Matekf405 fc and FCHUB pdb
Turnigy 65c graphenes
Soft mounted FC and motors are hard mounted, the soft mounts i found just amplifies the vibrations.


#2

High P’s don’t normal cause hot motors that’s normally D.

But looking at your P values they are on the high side so you may have over tuned your quad.
Maybe the over tune is causing some vibrations that the gypo and D gain doesn’t like.

You say stock pids feel close to locked in and the motors are only slightly warm.
I would go back to stock pids and tune around that area.

I normally raise my P’s by about 5 and lower D by about 2 and that normally works for a quick and dirty tune. (well for me anyway)

If I’m going to try and tune any further than that. I leave the default Ps and lower D down to 10 and start from there.

Tuning is a dark art that I have mastered yet.


#3

Do you also recommend using blackbox. I am fairly new PID tuning and still have a lot to learn. I am currently going through Joshua Bardwell’s blackbox series.


#4

Yeah if you can.

It helps


#5


is this bad?
too much noise?


#6

Can you attach that log file…

My blackbox is rusty but that does look like a lot of noise. you maybe able to fix some of it with filters.

Attach your log file and if I get time I’ll have a look.

no promises I can help. last time i did a full tune it took over a week until I was happy.


#7

The first picture that I sent you contained a before and after a filterLOG00023.zip (1.4 MB)