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Motors speeds up on zero throttle (Betaflight 3.0)
#1
The best way to show you my problem is this video.

https://www.youtube.com/watch?v=CmZNe8f6OJY

My board is probably damaged because I can't power it from USB it has to be powered from outputs pins to connect to CF or BF. Also there is problem with motor sync on the same throttle they have lest say 1200, 1200, 1600, 1300 (i believe it is ms) in motors tab.  

X-Racer is on the way and I will throw away that chineese Naze but is this FC fault? I hope that ESC and motors are fine.
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#2
Is airmode enabled?
[-] The following 1 user Likes doubleKO's post:
  • netox
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#3
hard to say, are the ESC calibrated? can you check what are PPM Min and PPM max in BLHeliSuite for each ESC? make sure they all match.
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
[-] The following 1 user Likes Oscar's post:
  • netox
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#4
(20-Oct-2016, 05:20 PM)doubleKO Wrote: Is airmode enabled?

yes airmode is enabled and the esc values in BLHeli suite are the same I really don't know what is going on
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#5
(20-Oct-2016, 07:06 PM)netox Wrote: yes airmode is enabled and the esc values in BLHeli suite are the same I really don't know what is going on

Well thats the point of airmode, when you are in the air, the motors will still spin at zero throttle so that you can do spins, yaws, and rolls.
[-] The following 1 user Likes doubleKO's post:
  • netox
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#6
Looks like your min throttle is too low for airmode - it should be set to a minimal value that is enough to let the motors spin smoothly - they should never stop or desync in airmode. If you are using blheli_s, raise that value you found by around 40-50us, I found that around 1070us should always be safe to try, but check that in motor tab - my raptors need a few us above that for example.

- learn to switch arm, it's pretty much the best way to go with airmode since you don't want to disarm your copter with stick commands if it's still spinning the motors on zero throttle
- motors will ALWAYS act dumb when on the table, without props and ARMED, mode doesn't matter - reason for this is the copter is continuously receiving errors and tries to compensate (in other words, PID loops kick in and motors spool up)
- after setting min throttle, check if it hovers with props on
- if it does, check if motors continue to spin and don't desync during inverted hang time and "zero" throttle on the stick for a second (or shorter ;p ).
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
[-] The following 1 user Likes KonradS's post:
  • netox
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#7
I will try to just disable airmode first if you think this could be an issue. I know my values are low I'm surprised too. I was using Cleanflight and had a little crash then fly few more minutes and go back home. After few days I realized that FC couldn't be powered with USB cable It can't also read voltage on the osd it shows 0.0v all the time. The only way to connect to Cleanflight is to power the board with output pins with 5v. All except this power issue was fine. My min throttle was higher and all works. Then I decided to switch to BetaFlight. Flashed and begin to configure all but motors start to spin at 1010 so to arm it properly I had to lower all the values min throttle and min command (you can see that on the video) and then all problems came up. Few times motors just started to spin very fast for a second or two after connecting the lipo and then stops. I will try your advices. Maybe this will help many thanks for your time and help.
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#8
Why do you want to stick arm in the first place? Airmode is a good thing, I wouldn't turn it off on any of my quads.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#9
When I was using Angle and Horizon mode and learn Acro, and want to have buzzer there was no place for arming switch in the 6 channel radio.

You are right I don't need Angle and Horizon now so I could use that switch for arming but this doesn't solve my problem. If this is somehow Airmode fault I will still have motors that accelerate on 0 throttle.

I don't really think it is Airmode because It was flying fine on CleanFlight even after that little crash and yesterday I flashed CleanFlight again and restore my all settings from backup and this is also happening.
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#10
(21-Oct-2016, 05:38 AM)netox Wrote: When I was using Angle and Horizon mode and learn Acro, and want to have buzzer there was no place for arming switch in the 6 channel radio.

You are right I don't need Angle and Horizon now so I could use that switch for arming but this doesn't solve my problem. If this is somehow Airmode fault I will still have motors that accelerate on 0 throttle.

I don't really think it is Airmode because It was flying fine on CleanFlight even after that little crash and yesterday I flashed CleanFlight again and restore my all settings from backup and this is also happening.

I know, you don't need this right now, but you can have both ARM and mode select on the same switch if you have a 3-position one.

Again - motors will always act weirdly if armed without props. Airmode is just making this "issue" more obvious. In most cases it is all good if checked with props on.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#11
(21-Oct-2016, 07:57 AM)KonradS Wrote: I know, you don't need this right now, but you can have both ARM and mode select on the same switch if you have a 3-position one.

Again - motors will always act weirdly if armed without props. Airmode is just making this "issue" more obvious. In most cases it is all good if checked with props on.

I know they could but I haven't any of this issues before with airmode and CF. Throttle zeroed motors stopped all the time. The question is also why there are different rpms at the same throttle value.
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#12
(21-Oct-2016, 09:09 AM)netox Wrote: I know they could but I haven't any of this issues before with airmode and CF.  Throttle zeroed motors  stopped all the time. The question is also why there are different rpms at the same throttle value.

As I said before, they shouldn't ever stop with airmode. Aside from other details, airmode gives you full control of your quad while on minimal throttle. It can't do that if motors stop. EDIT: you need to use arming on TX switch to use it properly.

Motors get different RPMs because PID controller is going nuts if your copter is armed with no props on. You should only worry if something bad like that happens when you hover. If you are able to maintain stable hover, that this is not an issue.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#13
Practical example from while I was arming with sticks:
my first session with motor stop, I put too little throttle during flip and some of the motors halted. Littlebees didn't manage to sync properly. The result is a random throttle inverted crash:

EDIT: note that was a long time ago on old firmware.

Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#14
you were right quad in the field files fine but today I had a situation that after landing and disarming motors stsrts to spin very fast in my hand glad I didn't catch it differently ;/
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#15
On some configurations of failsafe motors will spin for a second... Did it happen when you turned off tx maybe?
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