Hello guys,

I was starting a flight with my drone, and when I started the engines, one of them was losing speed. I replaced it with a new engine and the problem didn't resolve itself.

I recorded a video with the problem.



Does anyone have any ideas, what could be causing this?

That motor is twitching. Its not the motor itself but rather the ESC.

I am assuming you double checked the connections and inspected the ESC to ensure there are no solder balls.

You might have a bad MOSFET on the ESC for that motor. Not something a firmware update can fix. It needs physical repair, soldering and probably MOSFET replacements.

That looks like the Speedybee F7 flight controller. Is that the Speedybee ESC? If so they are known to have issues.

Which version of the ESC are you using in blheli32? V2 or V22?

Here's a link to Speedybees post depending on your esc version and possible solutions.

https://www.facebook.com/groups/42935782...918502760/

Personally I'd try a different ESC. I have one working one that speedybee shipped me that's not available on market yet. It's the V3. Once that comes to market I'd give it a try.

(11-Apr-2022, 11:13 AM)dwije21 Wrote: That looks like the Speedybee F7 flight controller. Is that the Speedybee ESC? If so they are known to have issues.

Which version of the ESC are you using in blheli32? V2 or V22?

Here's a link to Speedybees post depending on your esc version and possible solutions.

https://www.facebook.com/groups/42935782...918502760/

Personally I'd try a different ESC. I have one working one that speedybee shipped me that's not available on market yet. It's the V3. Once that comes to market I'd give it a try.

I'm using the Speedybee f7 v2 stack, I'll read the solutions and try to fix it.

I don't know how to see the blheli32 version.

I got it in the CLI

I did an update on my ESC using BLHeli and the problem was solved.

Thank you for your help!

(11-Apr-2022, 02:49 PM)dgaraujo89 Wrote: I did an update on my ESC using BLHeli and the problem was solved.

Thank you for your help!

Great good to hear! Glad they fixed it in the update.

(11-Apr-2022, 02:49 PM)dgaraujo89 Wrote: I did an update on my ESC using BLHeli and the problem was solved.

Thank you for your help!

What did you update TO? To which version?


This looked like either a bad BLHeli or a bad EMF circuit.

On BLHeli sensoreless ESC, there are 3 sets of voltage dividers connected directly to motor pads.
At low rpm, its TINY voltage, and difficult to spin motor. If resistors are slightly damaged or bad solder joint, it can cause something like this.

But in general, ALL BLHELI ESC will stutter motor at low throttle, and it doesn't matter what happens below 1050.. whatever your idle speed is.

(16-Apr-2022, 08:27 AM)romangpro Wrote: What did you update TO? To which version?


This looked like either a bad BLHeli or a bad EMF circuit.

On BLHeli sensoreless ESC, there are 3 sets of voltage dividers connected directly to motor pads.
At low rpm, its TINY voltage, and difficult to spin motor. If resistors are slightly damaged or bad solder joint, it can cause something like this.

But in general, ALL BLHELI ESC will stutter motor at low throttle, and it doesn't matter what happens below 1050.. whatever your idle speed is.

I plugged my esc into blheli and it detected a fault in one of the motors and asked me to fix it.
I opted to fix it and blheli downloaded a new version of the ESC firmware after that my problem was resolved.