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  1. #1
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    New weakpoint: 2200 motor rotor.

    Hey guys.

    Its been a difficult day at the field, first run for my test inferno i bought used was a disaster. Blown tires, melted spur. So i take out the erbe for the casual big airs.

    3rd battery, dang. My 3rd (or 4th maybe) rotor blasted inside the coil. Motor stuck, smelled bad once again. Took the spare motor from the inferno and continued bashing. So i need some info here as i don't know why this happens so often.



    My gearing is 19/55 steel mod1 on losi diffs and badlands. I can say the motor runs a bit on the hot side but nothing too extreme. I have also modded it for single 6s battery with double motor mount like this



    the motor flexes a lot less than stock, i dont know if crashes can cause a rotor damage.

    so what is the deal here? i was considering to go for a different/larger motor to be more sturdy on 6s. Any opinions welcome
    <3 Traxxas~Align~Ducati~Lib-tech~JacksonGtrs <3

  2. #2
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    well i guess i m gonna solve this on my own :P

    at least what are the 8s motors out there? anyone has some knowledge?

    (and what do you think of the gearing i think it is correct...)
    <3 Traxxas~Align~Ducati~Lib-tech~JacksonGtrs <3

  3. #3
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    if you melted your spur gear i am guessing your slipper clutch it set way to loose and that's the cause of your motor.same thing happened to me on my first erevo when i left the slipper loose.

  4. #4
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    no the spur of the inferno melted probably because the motor moved there. i have steel on the revo
    <3 Traxxas~Align~Ducati~Lib-tech~JacksonGtrs <3

  5. #5
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    how do you set your gear mesh?maybe it's too tight and causing the motor to over heat.that's what i have seen in the past that causes the motor to do that

  6. #6
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    hmm ok. i will go looser next time didnt think of that. i will also install a fan
    <3 Traxxas~Align~Ducati~Lib-tech~JacksonGtrs <3

  7. #7
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    Some reasons I can think of for rotor failure:

    - Motor rpm much too high (esp under light/no load). The centrifugal force overcomes magnet bonding material and rotor wrap.

    - Worn motor bearings causing slop which allows the rotor's protective wrap to rub on stator cores and wears it away. After that's gone, only the glue securing the magnet to the rotor is left to keep it together.

    - Warped motor can/stator from grossly excessive heat, which allows the rotor to contact stator.

    - Combination of crashes while motor at high rpm. The high rpm is already applying centrifugal force against the magnet bond/rotor wrap, and adding a sudden stop from crashing could be "the straw that breaks the camel's back".
    http://scriptasylum.com/rc_speed/

  8. #8
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Fans are a bad idea unless you already have temps under control.
    Whatever it is I just said... I could be wrong.

  9. #9
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    thanks for the info.

    why are fans a bad idea? and by the way thabks for the avatar now i see how the motor rotates
    <3 Traxxas~Align~Ducati~Lib-tech~JacksonGtrs <3

  10. #10
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    Quote Originally Posted by fuzion View Post
    thanks for the info.

    why are fans a bad idea? and by the way thabks for the avatar now i see how the motor rotates
    Because if you are relying on a fan to maintain proper temps and the fan fails, the motor will overheat.
    http://scriptasylum.com/rc_speed/

  11. #11
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Not only that, but because the fan is going to have very little effect on the core temp of the motor. But, if the motor is geared properly and does not over heat, a fan and sink will help keep the motor even cooler; and cool running electronics are happy electronics.
    Whatever it is I just said... I could be wrong.

  12. #12
    Marshal ksb51rl's Avatar
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    Quote Originally Posted by BrianG View Post
    Because if you are relying on a fan to maintain proper temps, WHEN the fan fails, the motor will overheat.
    Fixed that for you.

    Also:
    Quote Originally Posted by fuzion View Post
    ...why are fans a bad idea?...
    Dude, you're busting rotors... what chance does a fan have of surviving?
    Alt-248 on the number pad =

  13. #13
    RC Turnbuckle Jr. 87 GN's Avatar
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    I've got nothing, just a what's up BrianG..............lol

    I've watched some of fuzion vid's I must say you drive it like you stole it
    can't tell from the pic still have the alum bulks..?
    Would you go flip my truck back over??

  14. #14
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    yeah it all seems logical. i have the feeling its high jumps along with motor bumping on the chassis during landing while the whole thing spins. i must trim the chassis there because it touches the motor.
    i also agree the fan wont make any difference besides some hot days, which arent close. but i dont think its a bad idea in general having a fan, but yeah not relying on it to solve the problem.

    by the way i think my gearing is correct dont you? i went by the calculator
    <3 Traxxas~Align~Ducati~Lib-tech~JacksonGtrs <3

  15. #15
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    @87gn yeah its still on the integy bulks and losi diffs. i havent had a problem there for so long i think i may even call it reliable now haven't landed nose in yet though lol. better driver less damage
    <3 Traxxas~Align~Ducati~Lib-tech~JacksonGtrs <3

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