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  1. Mihai_F

    FOC questions

    well some of my hall noise was caused by slow FETs (IRFP4468 with added 33nF on gates. This is test setup) and not enough dead time, 2us, at 22,5Khz PWM freq, the turn on and off kind of overlapped a bit with 2us deadtime....increased deadtime to 3us and is cleared that noise on Hall signals...
  2. Mihai_F

    FOC questions

    hy, thanks for your input, i have looked on it, will think about it and learn. In the mean time, i figured out some things, first is that i got bit by the hall sensor noise again, and only if i had not been in that position before..., yep... Then the second, i modified the code so that...
  3. Mihai_F

    FOC questions

    I have made the hall implementation, without interpolation works great, good torque all that. I have also made hall sensor interpolation, and it kind-of works, it somehow produces rpm/angle fluctuation ,with a small motor seems to run smooth, because rpm fluctuations are not so pronounced on a...
  4. Mihai_F

    Electric Drift Trike Build

    Well a comparison could be in car drifting, FWD car you have to have a good and use the handbrake, a RWD car you need to have some HP in order to spin the rear end, and that is on good traction surface like asphalt, but on sand or snow is a lot easier (less power needed) on both cases. So it is...
  5. Mihai_F

    FOC questions

    i did manage to tune the PID a bit more, i did have the issue of not using S.I. units for the values of all the parameters, voltage current and so on..., went out with the drift trike tested the controller with 60V batt, did work better but still losing sinc when crossing from sensored to...
  6. Mihai_F

    FOC questions

    that may be... well this FOC stuff has a lot of parameters, many of them need a good explanation of what do they do, so far i'm struggling understanding their implication and their effect, and i do not know how it should work right. BLDC 6 step that i'm used to is waaaay simple. So still...
  7. Mihai_F

    Electric Drift Trike Build

    it has front brakes, they do work very well isn't super heavy, it weights about 35kg without battery, it has to be strong i'm quite big and heavy.... :D this isn't new under the sun, there ware many built and tested before, so its working principle is well proven... as to traction on plastic...
  8. Mihai_F

    Electric Drift Trike Build

    well, the main reason for no foot rests on the frame is that i do not like how it looks, second, it ads weight and size to the frame (although my frame is a bit over built, could have been lighter), so foot pegs on the front fork was the next best thing, plus the first powered drift trikes that...
  9. Mihai_F

    20Kw motor and 300A ESC (ultralight aircraft propulsion system)

    After i replaced the dead cells from battery, i charged it up, it took 45Ah, but wasn't completely drained down. Sunday went flying, did a 30min nice flight, din pull 15.5Kw max power, that is the usual, batt age. The temps got up a bit since was 30degC ambient. Min Vcell still has some bugs in...
  10. Mihai_F

    FOC questions

    The main usage of these FOC is for terrestrial use, this is my test platform project Electric Drift Trike Build Did you had problem with current range of the current sensor/shunt? i'm getting really high phase current "spikes", i put the current sanity check on phase currents and its limit is...
  11. Mihai_F

    Electric Drift Trike Build

    i'm back with updates, had to change the rear tires , they ware to large and did not fit the 250mm OD plastic pipe, i painted the frame, i put a 20x3.0" front tire , it looks cool. I did mange to ride it a bit with the test controller, it slides nice. i'l let the photos tell the story. i'l put...
  12. Mihai_F

    FOC questions

    Well the duty mode was just incrementing/decrementing Vq thru a time constant buffer (no PID). The sensored observer at startup just gives 6 angles, one for each middle sector (like 6 step commutation), but now i working on implementing to get real angles from it. I tried (sensorless after...
  13. Mihai_F

    Electric Drift Trike Build

    here are a few more photos, the development controller, a small high speed test brushless motor , and other stuff. last pic is keyway broaching on manual lathe about 100 passes (0.040 each) for a 4mm keyway, diy tool also.
  14. Mihai_F

    20Kw motor and 300A ESC (ultralight aircraft propulsion system)

    Hy there, I bought 5000mAh hobby king cells to replace the 2 dead cells from the battery. I chose the same cells again, because I have 2 packs 3s and 4s that are 9yrs old (same batch as my ultralight plane batt) and i abused the heck out of them on my rc car and plane the past 3-4 yrs they...
  15. Mihai_F

    Electric Drift Trike Build

    Hy there, I will present here my electric drift trike build, with details for mechanical and electrical parts. It all started after i decided to migrate my projects to STM32, then started to make my FOC code and controller, here is the FOC thread FOC questions So i needed a "vehicle" to test my...
  16. Mihai_F

    FOC questions

    I only plan to use sensor for start up, to know the initial angle, i did some test and it works, but i'm having trouble with sensorless switchover. It starts with halls, great torque, kinda jerky, then (at about 100rpm) transitions to sensorless witch works good, even down to verry low RPM. One...
  17. Mihai_F

    FOC questions

    That is very similar how i implemented it in my 300A EPS aircaft controller, but BLDC tarp waveform, with adaptive timing advance. There was a lot of filtering needed for checking hall input fi valid or not because of noise...lots of "PITA", in the end works nice, now i plan to migrate it to FOC.
  18. Mihai_F

    FOC questions

    Hy, thanks for you last response, that cleared the things a bit. Now, can you explain a bit the hall sensor implementation (principle) in MESC software, how do you get from hall pulses to rotor angle? I seen that you measure the time tick (pwm cycles between hall states), but i'm a bit lost in...
  19. Mihai_F

    20Kw motor and 300A ESC (ultralight aircraft propulsion system)

    the cells that would use are made by LG chem lithium NMC/ NCM712,- pouch rectangular, and will be ider individual or from vw id batt module, a pack with about 100 to 120Ah 50 to 64 kg 22 or 24s in order to have about 80-90 min flight time. I found some sources here in europe that have LG chem...
  20. Mihai_F

    20Kw motor and 300A ESC (ultralight aircraft propulsion system)

    Hi there, I managed this weekend to get one more flight (30min) out of my battery (21s left), it held 14 to 12kw for 4minutes, then 7kw for almost the rest of the flight. All monitored parameters ware in spec, and about toward the end of flight, all cells reached 3,3v to 3,4v about the same...
  21. Mihai_F

    FOC questions

    Hy guys, I have some questios regarding FOC operating modes, speed, duty, torque. So far in my implementation PID controlled the Vd comand in order to keep Id at 0. Vq directly controlled by throttle input gives duty mode. I tried Vq thru PID and it worked like torque mode, throttle input...
  22. Mihai_F

    Selling 22Kw motor

    updated prices
  23. Mihai_F

    20Kw motor and 300A ESC (ultralight aircraft propulsion system)

    A bit of an update. Battery degradation after 9years, stored at 20degC and at 3,8V/cell most of its life, it had a total of 10 cycles on it. One year ago it started to die, first 2 cells at once went to 0v over a time of 1 month (at that time i was doing batt measurements in storage once a...
  24. Mihai_F

    20Kw motor and 300A ESC (ultralight aircraft propulsion system)

    Hello Guys! Due to some personal reasons i have to sell my project, all its contents. https://endless-sphere.com/sphere/threads/selling-22kw-motor.123123/
  25. Mihai_F

    Selling 22Kw motor

    Hello Guys! Selling BLDC outrunner motor, 22kw max for 1 min, 216mm diam, 8kg, 30 slots 40 poles, 3100Rpm at 91V, N45 magnets: 1300 Euro One set of stator laminations for the 22Kw motor: 300 euro New motor production time 30 to 60 days , price 2500euro Will ship only in Europe. If interested...
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