Posts: 4 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Feb 2021 Reputation: 0 Hi there, I am building a quadcopter with my own flight controller, and I am using a 4-in-1 30A ESC. I am facing issues with ESC, as the motors stall above 48% of throttle. I am a total newbie with all ESC stuff. As far as I know, my ESC embbeds BLHeli_S. I managed to upgrade and configure it with BLHeliSuite with a 4-way interface arduino board (as I don't use Cleanflight or BetaFlight, I can't use BLHeli Configurator). The ESC controllers were in version 16.5, I upgraded them to version 16.7: same behaviour. I also gave a chance to JESC version 2.3: new startup and arming sound are cute  , but I still get the same behaviour. The only parameter which seems having any effect is demag compensation : when setting it to "high", I manage to reach 100% throttle when increasing the command step-by-step, but motors still stall if I increase the throttle command too quickly, or at 48% throttle (I found some persons who experienced kind of vibrations at this throttle, I have vibrations in much worse :/). I don't think I have a lack of current, as a single motors is supposed to consume much less than 30 amps. For information, motors are Multistar 2212 / 920 kV with 10/4.5 propellers. The quadcopter weight is 1 kg. What do you think about this problem ? Should I replace my motors or my ESC ? Tell me if a video can be usefull. Arnaud ![[-]](https://intofpv.com/images/collapse.png) • Posts: 6,092 Threads: 172 Likes Received: 2,283 in 1,830 posts Likes Given: 4,721 Joined: Feb 2019 Reputation: 100 as mutch informations as posssible, a video might be helpfull.
what does mean "your own flightcontroller, what software do you use?
what motor protocol are you running? • Posts: 4 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Feb 2021 Reputation: 0 (02-Feb-2021, 12:37 PM)hugnosed_bat Wrote: as mutch informations as posssible, a video might be helpfull.
what does mean "your own flightcontroller, what software do you use?
what motor protocol are you running? Hi, thanks for your answer ! Please find a video which shows my problem : https://drive.google.com/file/d/1xJG3IyU...sp=sharing The motor is on a scale to measure its thrust. [quote pid='128576' dateline='1612265837'] what does mean "your own flightcontroller, what software do you use? [/quote] I am developing my own flight controller from scratch, thus developing a new software. [quote pid='128576' dateline='1612265837'] what motor protocol are you running?" [/quote] I was using standard PWM (1/2 ms pulse), I now switched to DShot 600 with same effect. I don't know if it can have any impact, but I am sending the thottle command 100 times a second. I hope those information can help. • Posts: 6,092 Threads: 172 Likes Received: 2,283 in 1,830 posts Likes Given: 4,721 Joined: Feb 2019 Reputation: 100 very nice project, thats not in my range i cant help, sry
the only thing i coudl suggest is a "betaflight/cleanflight..." flightcontroller to sort out if its related to the esc or the the fc.
as you wrote about vibrations on midthrottle, get sure you have enough capacitance added by capacitators. • Posts: 4 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Feb 2021 Reputation: 0 (02-Feb-2021, 02:11 PM)hugnosed_bat Wrote: very nice project, thats not in my range i cant help, sry
the only thing i coudl suggest is a "betaflight/cleanflight..." flightcontroller to sort out if its related to the esc or the the fc.
as you wrote about vibrations on midthrottle, get sure you have enough capacitance added by capacitators. Thanks for that idea, do you mean capacitances on battery power supply input on the ESC ? Do you have any advice of capacitance value ? • Posts: 6,092 Threads: 172 Likes Received: 2,283 in 1,830 posts Likes Given: 4,721 Joined: Feb 2019 Reputation: 100 02-Feb-2021, 02:44 PM (This post was last modified: 02-Feb-2021, 02:48 PM by hugnosed_bat.) capacitance by uf; 1000uf 35v capacitator or 2000uf 35v
this could probably compensate a bit a noise issue
ine important part of flightcontroller software seems filtering noise, probably you need to get into filtering if you didnt already? but i have no idea about • Posts: 12,099 Threads: 125 Likes Received: 3,739 in 2,836 posts Likes Given: 99 Joined: Feb 2017 Reputation: 388 02-Feb-2021, 04:46 PM (This post was last modified: 02-Feb-2021, 04:46 PM by voodoo614.) Do you have a flight controller that you can wire the motor to test to see if it is your FC problem. Or a servo tester? • Posts: 4 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Feb 2021 Reputation: 0 (02-Feb-2021, 04:46 PM)voodoo614 Wrote: Do you have a flight controller that you can wire the motor to test to see if it is your FC problem. Or a servo tester? Hi voodoo614, I tried with a servo tester, with the same effect. I also added a 2 mF capacitance on the ESC power supply, as close as possible of the ESC, with no effect. I am going to try with another ESC, I don't have any other idea  Arnaud • Posts: 6,092 Threads: 172 Likes Received: 2,283 in 1,830 posts Likes Given: 4,721 Joined: Feb 2019 Reputation: 100 hopefully it is the reason.
as you build your own fc software: if the issue would be in betaflight, midthrottle issues, i would mention "tpa feature" as a reason. dont know if it is helpfull in anyway. • Posts: 12,099 Threads: 125 Likes Received: 3,739 in 2,836 posts Likes Given: 99 Joined: Feb 2017 Reputation: 388 The ESC or motor is likely bad if the servo test cannot spin it. • |
