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    Motor Controller with Customizable Electronics, easy DIY and repair OpenSource

    Hi. I could not open the Project_2021-12-28_22-55-40.zip with the windows .zip archive manager, and also not with 7z. I also did not succeed importing it into online easyeda, that's the software the project was made in, right? Am I doing something wrong here? Thanks! Br,
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    Motor Controller with Customizable Electronics, easy DIY and repair OpenSource

    Hi. Just some questions (btw, I won't be able to design/improve the board myself as much as I'd like to, no experience in designing smt/smd boards, so feel free to ignore me with my silly questions) Why do you think going to smaller smd components is the way to go? Taking a look at the board...
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    Motor Controller with Customizable Electronics, easy DIY and repair OpenSource

    THIS! WOW! So I have been toying with more or less the same ideea. There are a lot of two-board designs out there, why not just take one that already exists with the microcontroller and just make the power electronics board around it? Half the work is done already with something like the...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Hi Jaykup, Thanks for the writeup about the vesc related projects, and thanks for the writeup about how to flash the software. Very very cool! Maybe just maybe you should have :)... You were one of the people both on topic AND really really helpful in this thread! Please don't get dragged...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Hi. Was just a joke :). I really do think they did some custom stuff they deem worthy of protection as a competitive advantage. And judging by the volume of products they have on sale and the pace they are developing them, they probably have the engineering skills and experience necessary to do...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Are you sure the "normal Vesc code" works OK on it? somebody mentioned higher current than with the off-the-shelf-custom-code... Maybe it runs ok-ish but poorly. maybe it blows up under some conditions :) Or maybe it' is the *exact same code*, and flipsky only cheaped out on components and...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    OK, now I understand :) I am of a slightly different opinion... I understand GPL more as in "what is mine is *everybody's*, ..." As in, I really appreciate the HUGE amount of effort that went into the VESC, both Benjamin Vedders own, other contributors, and the huge amount of work he/they...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Hi Come on mxlemming, you're surely playing the devils advocate here for the lulz, aren't you :). I mean, I know editing the binary is not that uncommon, but it is done more to hack some ready made proprietary product (or?). Also, I don't think it's the case here, especially since they gave...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Hello. Has anybody managed to update firmware? I'm really curious if it works or if there really is something stopping this (other than the appropriate cable not being outside) Br,
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    Left side drive: what's current?

    Hi. If i'm obtuse and offer no valuable info, it's not deliberate. I'm trying the opposite! Here my last honest attempt: The motor you quoted (https://alienpowersystem.com/shop/brushless-motors/63mm/aps-6374s-sensored-outrunner-brushless-motor-30kv-2800w/) is specified with 7.5Nm of torque...
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    Left side drive: what's current?

    Yeah, the rear driven sprocket - my plan too: replace the disk brake. But my concern is about attaching the little driving sprocket to motor shaft. What do you do on that end of the drivetrain? Thanks for the info, also regarding CAD. Only once ever tried my hand at this area of design tbh...
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    Left side drive: what's current?

    Only ever used Tinkercad for 3d printed parts, but this is not the problem, I think I would be able to do this relatively easily. My bigger concerns are: 1) hard to find laser cutters where I live - last time I searched. 2) the part with the teeth, lets say it's OK, but then how to I attach it...
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    Left side drive: what's current?

    Back on topic to drive train stuff. Well to get high reduction (~8) in 1 stage, the driven sprocket would need to be HUGE. Just this. That's why I'm looking at chains with smaller "step". What are you implying? That I am a bad engineer? What gave it away? :lol: To answer the question though...
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    Left side drive: what's current?

    I made the same calculations as you, based on the same assumption as you. Only to realize while the calculations were correct, the assumption was wrong... --> this assumption. It is an assumption, and it's wrong. :) Typically the low kV motor is the exact same motor as the 200+ kV version...
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    Left side drive: what's current?

    Hi TorontoBuilder The belt drive you are describing has a gearing ratio of about 1:2.4... I think that at this low reduction, the 6374s will not be spinning nearly fast enough to produce the 2.8 kW it's supposed to. (You have to spin a motor it in its optimum RPM range to get the nominal...
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    AT12070 motor (similar to many 12070, 12090... motors)

    Oh boy. I expected it, given the no load power readings, but still, disappointing. The difference is negligible at a few kW, but at 25kmh (~220W) its the difference between 80% and 60% efficiency. The only way to lower the core losses then it is to gear the motor to a very low RPM, but then you...
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    AT12070 motor (similar to many 12070, 12090... motors)

    Hi Mxlemming. Oooh OK, understand now. This is where my "100kV is 100kV" falls apart. You get the same torque per amp.... until the core saturates, and then you don't. Haven't thought of that. The 80100 I'm eyeing will do some more torque until it saturates than the 8080, but yeah, 12070 will...
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    AT12070 motor (similar to many 12070, 12090... motors)

    Hi Mxlemming. Thanks for the info. Quite some valuable nice details Don't understand where you're going with this. I mean, At least I think of it this way: a say 100kV motor, be it the 80100 or the 12070 will give me the same 0.1 Nm for each Amp I feed it. The difference will be the phase...
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    AT12070 motor (similar to many 12070, 12090... motors)

    Hi Mxlemming, Thanks for the pictures and write-up. Looks really nice in quite a lot of ways, and then not so nice in others. The whine.... maybe because of the fifth harmonic distortion in the back-emf? That's a bit of a nasty surprise. I mean, I expected it to be somewhat noisy, but I...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    My assumption about the driver was "Will do fine, doesn't have a hard job here anyway (driving a single FET per output)" And the whole thing is 100$ (+tax & shipping). I don't expect it to have the best parts with all the bells and whistles anyway. A purpose built gate driver for EV...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Seems google made less daring assumptions about *my* language skills and mercifully handed me an English datasheet :). Can't read much into it though. Ebike controllers ans BLDC Drivers are among the explicitly stated applications for the driver, which is good news...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Thank you Woly for the teardown pics and info! Really hope you're right on this. This would make an excellent little controller for the money, but non-firmware upgradeable kinda defeats the purpose for what I personally expect form a VESC-project based ESC... :) Going out on some speculation...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Interesting, thanks for the information. Low side shunt, then, seems a quite nice solution. I still wonder why all the VESC6 have the shunt on the phase wire (except the 100v one?). But that's quite off-topic :). Now I'm just curious to see if it's going to be programmable (as in firmware...
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    FLIPSKY new 20s 100A tiny controller (vesc based)

    Hi. Thanks for the warning. I've read that in a few other threads on this forum (mostly something like "datasheets are made to look good. Take them with a grain of salt"). And, even if the limit is actually *really* the one stated, it's probably still not a good idea to run things at the limit...
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    Left side drive: what's current?

    My respect for that frame! And the amount of work and care that has gone into it! My approach is sort of the opposite though. Trying to minimize the time I need to invest, by investing more $ to buy more off the shelf parts.
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