So here is the thing, I would like to use the Orel ESC (or shall I say, Sapog, because I assume Orel is hardware, Sapog is software, right? Btw, very curious, does Sapog name have something to do with russian word sapog, as in shoe? )
with my custom made motor to fly a copter. I’m using 4 cell battery Li ion battery pack, and the motor parameters are following:
Rated current 20A
Rated output power 225W
no load current (10V/A) 0.5-1A
no load speed (10V/rpm) 9450 rpm
winding resistance 50mOhms
So when I connected the motor to the ESC on default settings, I was getting some unstable spinup, and sometimes the rotor would stall even, if I tried to spin it up to a certain RPM. I was experimenting with tweaking the configuration according to the documentation but, still haven’t achieved satisfying results.
Also, Another thing, I have noticed is that is you spin up the motor really fast (~4k rpm) and then put the throttle down, and while rotor is still spinning, go up with throttle again, the motor might fall out of synchronization and stall. This is something you don’t want on copter, right. But this behavior I noticed on all kind of esc’s, even commercially sold, so perhaps it has to do something with the back emf not being large enough when the rotor is freely spinning, thus why esc loses synchronization, but not sure about that.
Another observation that I’ve made, is that if you change rotation speed drastically, let’s say from a 1k rpm to 5k rpm, quite often the esc would produce a current spike, and my battery protection circuit would cut off, which again is a major issue. In fact, the whole research I’m doing now is due to several crashes due to esc producing current spikes.
So my question, would be: ho to configure the ESC properly, specifically all the timings? I’m guessing my current spikes issue is mainly due to synchronization fails.
Perhaps you could guide me to some literature, or articles, because I am relatively new to sensorless bldc motor control.
This post may be a little chaotic, so if any extra details about the nature of problems or trials that I’ve been conducting is needed, please do ask.