Hi,

I have super hot EMAX RS2205 2300KV motors after hovering for 2 mins. Could it be related to underpowered ESC?

Confirmed the motor screws are not touching the windings. Confirmed the D in the PID is set appropriately.

Specs of quad:
- DYS XM20A ESC
- 3S 1300mah 60-90C
- Diatone 5045 bullnose
- EMAX RS2205 2300KV
- 250mm frame

When switching props to Gemfan 5030, motors are warm after hovering for 2 mins.

Do folks think the hot motors is related to underpowered ESCs? What is a more appropriate amped ESC?

Thanks in advance.

i don't think it's your ESCs, if they were under powered then your ESCs would get hot not your motors. if your motors are running hot I would think maybe they're getting to much power, but you're only running a 3S. what I would do is check the settings of your ESCs in BLHeli. you might have sync issues. or one of the settings might be wrong.

First of all, what is the weight of your quad?
2. what's your throttle (in percentage) roughly when hovering?
3. what's your motor timing in BLheliSuite?

I don't think it's related to your battery or being under powered by 3S at this stage... motors get hot when it's drawing too much current (if over weight or having lots of oscillations)

Weight: 520 grams/1.15 lbs.
Throttle: 25-30% when hovering.
Motor Timing: Medium

I also confirmed all ESC values are in sync in BLHeli. ESC don't get hot either.

Thanks for helping.

that sounds fine!

are you running cleanflight or betaflight? looptime? can you try setting everything back to default (PID/looptime/filters) and test again? (backup your settings first)

I am running Betaflight 2.7.1

As you suggested, I reset to defaults. I noticed the FC looptime was set at 500 before the reset. Now it is 1000. Just did an indoor hover test and motors were warm. I will try and do an outdoor test as soon as I can. My other 250 quad is using Multistar 2205 2150KV and they are always cool to the touch after a flight. This makes me concerned they may heat up quite a bit when I test outdoors. Do you find the Emax 2205 2300KV generally warm after a gentle flight? How about after an aggressive flight?

(14-Jun-2016, 03:40 AM)NoxNow Wrote: I am running Betaflight 2.7.1

As you suggested, I reset to defaults. I noticed the FC looptime was set at 500 before the reset. Now it is 1000. Just did an indoor hover test and motors were warm. I will try and do an outdoor test as soon as I can. My other 250 quad is using Multistar 2205 2150KV and they are always cool to the touch after a flight.  This makes me concerned they may heat up quite a bit when I test outdoors. Do you find the Emax 2205 2300KV generally warm after a gentle flight? How about after an aggressive flight?

they could get warm when you only do hover indoor, in real flight outdoor with good amount of cool air flow they normally won't get hot.

Did the outdoor testing today. Motors run slightly warm, but no where near the scorching heat I felt before. Thanks for the tips Oscar.

Btw, the main difference between the default configs and my original configs was the looptime was originally 500 and after reset went to 1000. Is there an empirical explanation of why changing the looptime would have such a large effect on the motor heat (high current draw)?

Thanks!

(15-Jun-2016, 03:47 AM)NoxNow Wrote: Did the outdoor testing today. Motors run slightly warm, but no where near the scorching heat I felt before. Thanks for the tips Oscar.

Btw, the main difference between the default configs and my original configs was the looptime was originally 500 and after reset went to 1000. Is there an empirical explanation of why changing the looptime would have such a large effect on the motor heat (high current draw)?

Thanks!

It updates motor speed twice as often on 500 than 1000. With dampened light on (which we all want), the motor is raising speed and actively slowing down frequently (even on minimal oscillations), creating more heat so a reasonable tune is more important on lower looptime.

Yea agree with Konrad, you need to re-tune your quad when changing looptime... on 1 looptime you are fine, one another, you might start getting oscillations...

Did some more flying in the park today. Super hot motors returned! 

Flying consisted of mainly hovering and doing flips. Never going over 60-70% throttle.

I tried a few things to try and eliminate the issue
- Turned OneShot125 off in Cleanflight. Motors still got hot.
- Set ESC Dampening to Damped High. Made throttle control difficult to manage.  So set back to DampedLight
- Tried to make the FC Loop Time higher than 1000. Cleanflight set it back to 1000. 

I've attached images of the BLHeli settings and PIDs from Cleanflight. I would appreciate it if you can take a glance at them to see if anything jumps out as a possible cause. If there are other details that you suspect may help ferret this issue out, please let me know.

My other 250 quad has identical settings so it makes me ever more perplexed. Granted motor is 2205/2150

Once again, thanks in advance.


Other specs: 3S, EMAX RS2205/2300, 5045 BN, DYS XM20A ESC, BetaFlight 2.71.    ESC's don't get hot.

   
   

so you have 2 quads with the same exact set up. the motors get hot on one but are fine on the other. so let's trouble shoot this problem. use a process of elimination. first swap out the FC, if that fixes the problem then you know it's the FC.

Issue solved.  

Before I went and started painstakingly swapping out parts, I tried lowering all the default PID settings.

Tweaks I did:
- set P for roll and pitch to 1.1 from 4.5
- set P for yaw to 2.8 from 9.0
- set D for roll and pitch to 14 from 18

Thanks for all the tips folks!