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  1. 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...
  2. Mihai_F

    Selling 22Kw motor

    updated prices
  3. 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...
  4. 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/
  5. Mihai_F

    Selling 22Kw motor

    Hello Guys! Due to some personal reasons i have to sell my project, all its contents. This is my project: 20Kw motor and 300A ESC (ultralight aircraft propulsion system) Here is what i'm asking for my propulsion system, detailed description is in the upper link on the first pages. BLDC...
  6. Mihai_F

    Motor Winding Calculations & Cooling Design

    Here i found a good explanation for some winding "type" decisions. These guys know they're business well. Also a very good explanation of skin effect in conductors. Enjoy.
  7. Mihai_F

    Motor Winding Calculations & Cooling Design

    I have done some studying regarding cooling options for electric motors, especially liquid cooling, and i stumbled on Direct Winding Heat eXchanger "DWHX" (it may be trade mark....). Basically there is a T or I shaped heat exchanger (liquid cooled) between the windings of the stator teeth, and...
  8. Mihai_F

    Is a 50KW Out Runner motor any good for a retro street motorcycle?

    The motor in the first link, they say 50kw, i would like to see how many seconds that motor lasts at 50Kw, i mean i have a monster motor at 216mm diameter, 8kg, big beefy coils, and at 18kw in 2 minutes hits 80degC at 25degC ambient. So what the heck? 50Kw at 154mm and barely 6kg, is max instant...
  9. Mihai_F

    Motor Winding Calculations & Cooling Design

    After a week of reading and studying(+500pages), i got some answers. I found a really good book(by pure luck) that discuses PMSM to, not just Induction motors, it's name is Design of Rotating Electrical Machines, and from multiple sources of information, i got some knowledge to do the...
  10. Mihai_F

    Motor Winding Calculations & Cooling Design

    Hello guys, I have been searching the internet for a log while, about formulas and books how to calculate the windings of a 3 phase motor, i.e. nr of turns, wire thickness etc. I found some good theory books, some good sites explaining stuff, but haven't found an actual practical example with...
  11. Mihai_F

    FOC questions

    Hy i'm back with progress, Big update, i transformed the code to a more readable and maintainable way, with structs, pointers and all that stuff (like mesc). I decided to do it now while it is "simple" and not "many" lines of code, because later would be much harder to do it... I kept playing...
  12. Mihai_F

    FOC questions

    Hy i'm back with more progress, i'v been testing on 3 different motors and speeds, testing sensorless staring and running algorithms. (i did not wand to just copy the mesc code, i preferred to just learn from it). So, at 0 throttle when motor in breaking, if i rotate the rotor (even slowly) I...
  13. Mihai_F

    FOC questions

    hy, I had an ideea with regard to flux observer, it started when i questioned the "add to itself" - integration "flux_a = flux_a + (Vab.a - m.R * Iab.a)* pwm_period- m.L_D * (Iab.a - Ia_last)" pseudocode from mesc The integral integrates, and if there are steady states or very small changes...
  14. Mihai_F

    FOC questions

    hy, i got success spinning the motor in sensorless FOC using the flux observer algorithm (although manually started :D ) and no PI yet, just manually playing with Iq and Id inputs, that is so cool though, seeing their effect. i still have some questions regarding flux observer: 1. in the...
  15. Mihai_F

    FOC questions

    here is the explanation of what i mean by that. Implement αβ0 to dq0 transform - Simulink
  16. Mihai_F

    FOC questions

    I have some questions, regarding mesc firmware: 1. i understanded that the phase voltages are "processed" only in tracking mode when the H bridges are disabled, and flux observer is "processed" at each pwm cycle, inside the calculations of flux observer is needed the phase voltages to calculate...
  17. Mihai_F

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

    Finding an off the shelf for these high power motors for a specific application is not very common, they might be a partial match, but that is not ideal. For specific application you need the motor to be made to match you requirements. Electric propulsion in aviation is not very common yet, so...
  18. Mihai_F

    FOC questions

    Hy, Thank's for guidance, i'm back with some progress, i managed to spin the motor in a crude "open loop"/ no feedback mode, i'm doing this on a test controller with a small 1Kw motor, and off the bat i have to say that i'm blown by the fact that this space vector control mode (not FOC yet) can...
  19. Mihai_F

    FOC questions

    hello to all, I have studied FOC motor control for a good while now, i understanded most of it. If i remember well you have done you own FOC code, so i have some questions about FOC algorithms to clear things out. So far i understand and made (code) the following: clark transform from Ia, Ib, Ic...
  20. Mihai_F

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

    The 1uF mlcc on DC bus, i see them as them as HF decoupling on DC bus, and good to have there, although when going from 9pcs 4,7uF to 9pcs 1uF i did not see any big difference on the waveforms, and probably they do not do much, since there are RC snubbers on each mosfet. They are flex terminated...
  21. Mihai_F

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

    I'm back with some good updates, i was never completely fine with IRF150P220 mosfets on the power stage, they had some strange turnoff ringing that could never be resolved, so after some talking with zombiess regarding "new generation fets" vs "old generation fets", and i decided to swap fets to...
  22. Mihai_F

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

    Well i'm back with some testing, since the controller has a phase missing (last failure) and i'l have to order parts anyway, i decided to do some barbaric tests, and that means short circuit the phase leads to test desat protection. So basically i shorted the phase leads, the calculated...
  23. Mihai_F

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

    With regard to resistors, they are there from the beginning of this version, but what i want is to change they're value from 1r to 2.2/3.3/4.7r, and see what changes. Strange enough is that capacitors 4,7n or 10n in parallel with the gates made things worst. I want to tackle that ringing...
  24. Mihai_F

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

    I'm back with some study on an older issue, if you remember i had still some ringing on the gates that i attributed to source bond wire inductance.....But back in my head i was never fine with that, and it might be a culprit for my sudden mos-fets failures lately. Well, back then because i was...
  25. Mihai_F

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

    I'm back with a bit of trouble, i made some DPT in order to fine tune the desat overcurrent protection on each phase, i found this [FAQ] UCC21750: How can we adjust the DESAT detection threshold in UCC217xx & ISO5x5x? - Power management forum - Power management - TI E2E support forums it...
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