LibrePilot Forum
General Category => General Discussion => Topic started by: chromvis on August 10, 2016, 07:00:57 am
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Does anyone has references to serious publications or materials about Electronic Speed Controllers and motors?
I suspect there should be something better than "This ... is crap and that is the best...".
I have one quad (nighthawk 380 clone) with MT2208 2000kv motors and DYS BLHeli 30A ESC, 1 kg with 4000 mAh 4s battery and 6x4.5 props. It was always run hot motors and ESCs. I tried Pixfalcon, Sparkey2 and now Revolution on it. No matter what PIDs - motors and ESC are very hot and it feel wobbly and underpowered.
Today I tried autotune on it and one ESC finally fail (no visible damage, just dead). I replaced them all with old (relatively) Platinum 30A ESCs. They are heavy (35 g each) and big.
To my surprise quad shoots to the air easy and hover at 25% throttle. ESCs and motors are nice and cold. I did not change anything in this quad, only ESCs and I got dramatic improvement in quads flyability.
I think, this is related to ESC-motor compatibility and ESC firmware.
Would be very interesting to read more technical materials about it.
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2000kv 2208 on 4s with 6x4.5 props is too much prop for the motor/4s. It would be close to correct for 3s IMO. Start by fixing that. :)
I actually use 6x3.5 on a ~2000kv 26 or 28mm sized motor on 3s on an airplane which says to use a smaller prop on each fact (my cell count is smaller, my motor is bigger, it is an airplane).
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On 4s on that I would start by trying 5x3 (2 blade) props, but I am not an expert in that size of motor.
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Check out http://www.ecalc.ch/xcoptercalc.php
Just a thought - it would be totally awesome if someone implemented something like eCalc as open-source. It could be as simple as a bunch of javascript that runs in the browser, & maybe a repository of json data files sitting on the server so it could be hosted statically from anywhere, even directly on github. Crowd-source the performance data.
Another angle would be to integrate into a GCS plug-in, wouldn't that be cool?