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  1. Ludo91

    LOW COST UNMANNED SOLAR AIRCRAFT. We did it!!!!!

    Hey guys! working hard on our finals, truly hoping to (finally!) release the data in a month and a half or so :)
  2. Ludo91

    Manned electric "quadracopter" takes flight!

    Really awesome! Tho I`d never like to be on the same plane as 16 spinning props :mrgreen: Only reason I can see for them being below me is the ability of using a parachute in case of emergency at a decent height :D I wonder too why don`t they use Ardupilot! It reached an INCREDIBLE level of...
  3. Ludo91

    Re-wind of a turnigy 80/100 (Now-tutorial w/Video)

    guys... As I told ya in my topic "help in building my own bldc controller" I put the "hot stuff" about my ebike on the shelf in order to be able to work hard for college... but still I cannot resist to do some little works on the bike, one of these days Im gonna try to put a ductjed fan on the...
  4. Ludo91

    LOW COST UNMANNED SOLAR AIRCRAFT. We did it!!!!!

    Typical airspeed is about 20 mph, it is an indicative value since here in northen italy clear sunny days are always really windy ;) If you know someone or somewhere to get sponsorship please tell us! :D
  5. Ludo91

    LOW COST UNMANNED SOLAR AIRCRAFT. We did it!!!!!

    it is 1.6 kg rady to fly, it stays in the air with 25 watts when flying straight and perfectly flat, average consumption on a flight is about 30W, +/- 1.5W (yeah we have crappy current sensors). We keept it at about 80 yard height Now the plane is in a box beacuse italy is northen enough on...
  6. Ludo91

    LOW COST UNMANNED SOLAR AIRCRAFT. We did it!!!!!

    Yep! my nad my friend want to realease all the plans about the plane, but since we are enrolled in a damn hard college we are seriously struggling with time, but we consider our projcet ope source and as soon as we get some time to do this we`ll make a .zip file with everything in it ;) Film is...
  7. Ludo91

    Help in making my BLDC controller

    THANKYOU AND SEE YOU SOON University is about to start and, since I`m still (and I hope I`ll be there for long) in the part of the life where when you get truly interested by something you give almost all your time to that I had to put my controller in a box and put it in my room ready for next...
  8. Ludo91

    Help in making my BLDC controller

    The thing was running GREAT (smooth and with a 1A no load current at 14V, 40% trotthle), with fets going no higher than ambient temperature. 14V source was current limited at 5A. Drivers are powered by and external source at 12 V. Resistance between drivers and fets was 9.6 Ohm. the thing was...
  9. Ludo91

    Help in making my BLDC controller

    It now spins fast and smooth!!!!!! :o :o Still, I have a problem: mosfet drivers are overheating! :?: :?:
  10. Ludo91

    Help in making my BLDC controller

    it still spins super chunky.... do u have any idea of the reason??
  11. Ludo91

    Help in making my BLDC controller

    Hey! I cleaned the board, unsoldered the fets (without killing them!) and getting ready to reassemble it, ready to be tested with the current sensor working and also internal hall sensors :-) Here is the cooling system I made! mosfet, copper and a heatsink perfectly coupled and, when i`ll...
  12. Ludo91

    LOW COST UNMANNED SOLAR AIRCRAFT. We did it!!!!!

    Hey my worldwide located electric powered friends! Me and a my "crazy projects mate" (Stefano, aka giubi.s) made a solar plane It is 3 yards of wingspan (2.3 meters to be precise), glassfirbe homemade fuselage and carbon/balsa wing. 28 panels are connect in 14s2p and are inside the wings and...
  13. Ludo91

    Help in making my BLDC controller

    I see. I will probably understand that better next year, when I`ll be studying "technical physics" and "fluid based machines" (both damn hard to pass but very intresting). This means Im gonna make it 6 fets and give each fet its own dissipator. I`ll post updates here! :-)
  14. Ludo91

    Help in making my BLDC controller

    I see. The point of the discussion was around this statement: "if we have the back plate of the mosfet in contact with fast moving coolant we get the best dissipation possibile (possible from the backplate, not considering legs and so on) beacuse the plate is continuosly in contact with...
  15. Ludo91

    Help in making my BLDC controller

    great, tnks ;) there is now a discussion between engineers about how to make the liquid cooling: Is it better to have the small heatsinks mounted on the right face of the mosfet and then have the liquid flowing on the heatsinks or having the whole mosfet submerged in the cooling liquid...
  16. Ludo91

    Help in making my BLDC controller

    This is pretty good news, working at 100A and 48v is still a very decent boost :lol: RIght now I`m working on the current sensor, so I can keep the thing almost under control as regards current. Very pratical question: I need to unsolder the mosfets in order to turn it in a 6 fets controller...
  17. Ludo91

    Help in making my BLDC controller

    hey guys! Like someone said a few pages ago my thermal design is just useless. I got tricked into doing that looking at mosftest "piled up" in up to 4 layers in chinese escs.... well, probably those mosfets havea different internal thermal design... Anyway, I am turning the little black almost...
  18. Ludo91

    Help in making my BLDC controller

    Thnakyou VERY much for your help guys! Without that i would have never managed to build that thing! :wink: Also, I made a keychain and a hella nerdy jewel out of the two smoked mosfets... at 7 dollars each they are pretty decent jewelery :lol:
  19. Ludo91

    Help in making my BLDC controller

    Hey! I moved hall sensors a bit (I didnt realize it was so sensitive to their placing, it needs to be precise to the tenth of a millimiter!) and I moved the high side output on another arduino pin since the one I was using seemed to be somehow not working, maybe bad connection on the screw...
  20. Ludo91

    Help in making my BLDC controller

    IT SPINS!!!!! IT DAMN WORKS!!!! ONE OF THE GREATEST DAYS EVER!!! :D :D :D :D :D :D :D :D
  21. Ludo91

    Help in making my BLDC controller

    I agree and I did somewhat same thing as you, I tested each block individually to see if there were big faults :D Hall block is working good, the 6 steps follow each other as expected The arduino seems to be ok (To be 100% sure I`l add a serial print to the code to have it actaully telling...
  22. Ludo91

    Help in making my BLDC controller

    I approve your idea. On Monday I`ll send an order of a few components (needed to fix my lawnmower) to RScomponents and I`ll add P channel mosfets so I can take you advice. Attached is the schematic, let me know if it is correct and also if it looks "ok" for a schematic :wink: the mosfet...
  23. Ludo91

    Help in making my BLDC controller

    I`m getting pretty desperate, this thing doesnt wanna work :( low side phase 1 mosfet put up his holy smoke, no idea why that happened. I removed them from the board and nothing happens, no pwm buzzing, nothing at all, only high side "having a life" was number one. I will now draw a...
  24. Ludo91

    Help in making my BLDC controller

    Great! I`ll go for a new test run with the trick on the lower mosfets and trying to change the hall sequence and placement, proper pwm freq and 100k pulldowns. I also posted a question about hall placements in the proper topic, so we "keep the knowledge organised" ,I`d love you to help here ...
  25. Ludo91

    Adding hall sensors to outrunners

    guys I`m pretty in trouble placing my halls. I have them with 17.15 degree spacing, but were relatively to the stator should I place them? Should the "middle hall" or one of the two side halls match one of the "openings in the stator"? (I dont`k now the english name of the 12 "free spaces"...
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