Search results

Date Relevance Most replies

  1. fdracing

    FEMM Help

    your not wrong , you have found the limit of this software , funny tool , but not very usefull :? like many open source and freeware stuff , they give you an idea not an reliable result , for real world stuff , you need to spend money ,a lot of money :wink:
  2. fdracing

    Why can't we build this motor?

    you may be right , the fact is that I like facts and évidences , and I did'nt see any so far , it's up to them to show us somes :mrgreen:
  3. fdracing

    Why can't we build this motor?

    I will start the various test I plan for my motor in two weeks ( which is very close o the Yasa dimensions ) , i will tell you after that what torque , efficiency , losses , and so on I got :wink:
  4. fdracing

    Why can't we build this motor?

    has anyone ever seen ( out of utube !!) these motor runing full load on car or plane or truck or on what so ever :?: I have read the pattent twice and , I got some doubs about the all things , it looks like a nice business fake , especially when you look at the numbers they claims out...
  5. fdracing

    axial flux motor question !!

    what effect or importance has the coil inner hole shape and surface :?: , and what if I fill it with hyperco laminated sheets :?:
  6. fdracing

    Doing the Math

    tanks for reply :wink: I have read that document weeks ago , when starting to use Koil 1.1 , it's clear that the pole/slot combination is one of the key point in sizing an BLDC motors axial or not unfortunately there's nothing available that can be adapted in my project , so i will go...
  7. fdracing

    Doing the Math

    am I wrong , or you plan F is very close as mine :wink: have you made any calculation :?: and would you like to share :mrgreen:
  8. fdracing

    axial flux motor question !!

    not the first choice for him and for you and probably many others :wink: does it means impossible :?: we'll see :wink: people thougth the earth was plate before they discover it sphere .....
  9. fdracing

    axial flux motor question !!

    you are right :wink: , the "reference" is from "amasing diy projects" , i think you know this guy here
  10. fdracing

    axial flux motor question !!

    the motor project I have for reference for my build have the coils group connected in parallele and it seams to works fine , what's the difference :?: and why not delta :?:
  11. fdracing

    axial flux motor question !!

    ok , I got it .........once again :wink: so in my case , phase to phase my resistance is 0.00304 ohms , pretty low !!
  12. fdracing

    axial flux motor question !!

    when I say phase resistance , for me it means phase to phase , 1 coil is 0.0456 ohms , so 10 parallele coils will be 0.00456 ohms , for me delta mean 10 parrallele coils connected from one phase to another phase and so on :wink: i dont understand that 2/3 :?:
  13. fdracing

    axial flux motor question !!

    need your help one more time :oops: data are as follow : 3 phases 96 volts 30 coils / 40 poles one pole magnet is : 62 mm x 20 mm , 10 mm tick , N42 , back iron 10 mm 1 coils is : 5.4 m , 36 turns , copper foils 10x0.2 mm , coil surface 2114 mm2 , coil hole center surface 541 mm2...
  14. fdracing

    axial flux motor question !!

    I did it this afternoon, and the result is the same , betwen 0.45/0.55 T , magnets space is 7.5 mm on the top row and 1 mm at the 3rd row ( i have 3 row of magnets ), at this row the leakage is important , field doesnt exceed 0.4 T :? and this having reduce my coil to 17 mm , and 0.5...
  15. fdracing

    axial flux motor question !!

    I am not sure to need a core, but to be able to fit the copper in the coils , i had to make them thicker , almost 18 mm :? , and at 18 mm the magnetic field decrease a lot it remains not more than +/0.4 T , it's not enough :? so I thought to give the coil a core to help :idea: , or...
  16. fdracing

    axial flux motor question !!

    Tank's :wink: what would be for you guy's the best ( available ) alloy to use as coils core , in my design , that means , not as stator ( it will be non conductive at all ) , just as coils core :wink:
  17. fdracing

    axial flux motor question !!

    another little question, when you have like me 2 stators with 40 magnets each , my pole pairs is 20 or 40 :?:
  18. fdracing

    Koil motor design software

    I tryed to deal with that sofware , it's a complicated one for expert that's for sure , or maybe just for it's author !!! :? it's not completely ready to be used as it is , because you cant select any wire to fit your coils , so it helps for some feature , like feasibility of your projects...
  19. fdracing

    axial flux motor question !!

    with and without , iron behind the magnets , nothing else to say :mrgreen: i am gonna use it , maybe more !!! lol
  20. fdracing

    axial flux motor question !!

    round magnet because I did not find out any rectangular one 65x20x10 mm :? as you know it's difficult to make torque without iron :mrgreen: , for me that will be for the rotors , and as I do the job myself ( I have lathe and milling machine ) I will left the mini as possible , stators...
  21. fdracing

    axial flux motor question !!

    i also try to change air by a diamagnetic gaz , like O2 , it helps a little bit , but hard to do in reality :mrgreen:
  22. fdracing

    axial flux motor question !!

    ok , i got it :mrgreen:
  23. fdracing

    axial flux motor question !!

    i left the property of air as it was , and for the boundary i'll take any advice for it :wink: here is the all rotor with some mod's on the left side , and as it originaly was on the right side
  24. fdracing

    axial flux motor question !!

    First test , i put my rotor drawing into FEMM , the field strength is not too bad , 12 mm air gap , 3 x round magnets 20 mm x 10 mm per rotors. I love that software !!! it give's me lots infos :wink:
  25. fdracing

    axial flux motor question !!

    today starting to work with FEMM 4.2 , it make some more sens to me now !!!, is there the same tool in 3D , and is it for you a reliable tool :?: i think i finally chosse my coil shape , it look's like a long thiny drop , i am learning from you guy's :wink: especialy , Miles ...
Back
Top