I have been building a new hexacopter based on the Tarot 680 Pro frame and I'm experiencing some issues with ESC sync.
The model uses a Pixhawk (running Arducopter 3.2) with Hobbywing Xrotor 40A ESCs and Tarot 4006 620Kv motors (1355 Tarot props). The props spin fine when armed but, on throttle up, some props either emit a 'pinging' noise or just stall completely. This seems to only be at low RPMs; if I continue to raise the throttle all of the props start spinning correctly.
Changing the 'timing' parameter of the ESCs has no effect (nor does calibrating them each individually). The same problem occurs with the RC_SPEED parameter set at 50Hz, 400Hz and 490Hz.
Out of curiosity I upgraded the Pixhawk to 3.3-RC8; with this build the issue seems to disappear... So my question is two fold: Why does the new firmware fix the issue... and is it really fixed (i.e. will I see issues during flight)?
Any help or suggestions would be welcome!
Replies
there is no such fix listed on the 3.3 releases at all...i would be cautious and assume is not fixed...to my knowledge the sync issues are mostly fixed by moving to BLHeli firmware on the ESC....thats what took care of it on mine....
That's what I suspected :)
I think the issue is 'smoothed' by the fact that the 3.3 firmware ramps up the throttle when moving from the initial armed spin rate to the input value as you initially throttle up. On the 3.2 firmware the throttle speed has quite a sudden jump.
I'll take the whole thing apart and flash the ESCs... Such is life!
Thanks for the response!