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  1. mxlemming

    Siaecosy 155-64 motor ?

    These lucid guys are good. Big respect for them. They know what they're talking about (Munro doesn't...) and they're true to their word that it's all scientifically and logically based. I'd always had serious doubts about the Tesla rotor and carbon wrap, cynicism given the increase in air gap...
  2. mxlemming

    FOC questions

    I've never found a motor that changed flux linkage by more than +70%... Most likely you have a math error somewhere. I've never seen more than like 20% actually... From your description it sounds like you might be doing funny things with this. You need to compensate for R and L.
  3. mxlemming

    New 100A FOC controller project

    Good that at least the box is isolated from the chassis. Personally I'd never rank EMI concerns above shorting concerns. Both are of course critical for a commercial product but if you're making one offs for fun... Well flames outrank hypothetical gremlins in any circumstance i can think of...
  4. mxlemming

    Motor Winding Calculations & Cooling Design

    https://patents.google.com/patent/US20240039448A1/en https://patents.google.com/patent/US20240039448A1/en Its not star delta switching. It's star option with individual coil driving option. It uses two complete inverters. At no point is there a delta configuration. There's 2x as much silicon...
  5. mxlemming

    New 100A FOC controller project

    Are you using the box as a ground? I recommend against that. Arcs to the case/inside the motor from battery and phase wires are very very hard to extinguish and irritatingly common. Don't ground the negative of the battery.
  6. mxlemming

    New 100A FOC controller project

    Nice. This looks super similar to the first VESC I ever made in layout. You can easily push that to 400A for a few seconds. Unless you accidentally messed something else up on it. Like the choice of MCU.
  7. mxlemming

    Siaecosy 155-64 motor ?

    You can only really test yourself. I never went above 7krpm. I wasn't aware of a similar size QS running to 10k. Does kia say it's star Delta switching or is it just Munro saying that? The controller layout is weird for a star Delta switch. More likely to be 2 controllers running seperately...
  8. mxlemming

    Siaecosy 155-64 motor ?

    Two observations 1) Munro is wrong about the star Delta switching. It's dual motor in one shell. Munro videos are full of nonsense. 2) skin effect isn't really important at the speed that motor will run. It's max is about 7000rpm, 4pp so 466ehz. Skin depth at that speed is 3mm. The bars are 4mm...
  9. mxlemming

    Siaecosy 155-64 motor ?

    It's an IPM (embedded magnet) motor. It's very salient and produces very good torque per weight.
  10. mxlemming

    VESC Tuning tips

    I cannot really recommend one against another. I only really work on my own hardware (which is not commercially available) and hardware I make for clients, which I am not going to divulge or credit one over another. I do not test common commercially available (aliexpress...) hardware.
  11. mxlemming

    VESC Tuning tips

    Copied from my original post on the flipsky 75100 thread... reposted in it's own thread at the request of a few people. FLIPSKY new 20s 100A tiny controller (vesc based) I shall update occasionally, maybe... I am not saying this is definitive, just to give you an insight into the way I tune...
  12. mxlemming

    FLIPSKY new 20s 100A tiny controller (vesc based)

    I could start the new thread... Give me a minute
  13. mxlemming

    Wye and Delta have anyone seen the new KIA 9 motor that can switch between Wye and Delta?

    Pretty sure it can't actually do this. It would not make sense to lay out the power stage like this. Looks like 2 seperate motors and inverters in the same...motor... I might be wrong though. But I think Munro are wrong here. Edit: https://patents.google.com/patent/US20240039448A1/en Here's...
  14. mxlemming

    FLIPSKY new 20s 100A tiny controller (vesc based)

    Haha, I occasionally do that, but it rarely works out great value for me because there's always "and another thing" and a 1h payment becomes 3h of work... Also, I cannot tune out bad wiring or broken hardware over video link... Mainly I design hardware for people these days. Electric Fox is...
  15. mxlemming

    FLIPSKY new 20s 100A tiny controller (vesc based)

    One day, I intend to make a video on tuning motors. I will outline my methodology in limited detail... I think it is kind of important because the common internet folklore about it is garbage/dangerous. DO NOT: 1) use slow abs max, EVER 2) blindly increase limits to make errors go away These...
  16. mxlemming

    Yasa/Makani controller teardown

    Thanks for that. Very interesting and remarkably simple. What MCU and whats the other mcu like chip on it? I see tms320 and 570 but there's another...
  17. mxlemming

    HESC V1 150v 600Amp VESC based motor controller

    Typically, heuristically, the ratio should be approximately equal to the voltage. It can be better to look at the gate charge at threshold compared to the miller charge. But MOS datasheets do not have a standardised way of quoting these numbers... it can be very hard to calculate exactly whether...
  18. mxlemming

    Why not thinner laminations

    I haven't got much experience in motor design, i focus on the controller side, but i recently went to a coil winding and steel stamping expo (yes as exciting as it sounds...) and it was very clear that no one wanted to deal with thin laminations. Everyone would do 0.35mm (literally hundreds of...
  19. mxlemming

    FOC questions

    Within the project there's a folder full of motor default parameters you can look at. It includes inrunners, outrunners of various sizes. Then in the mescfoc file you can find the way to calculate the kp and ki from these. It's all in there, publicly available.
  20. mxlemming

    FOC questions

    That is not a flux then. Flux IS the integral of voltage... what you have is a corrected and low passed voltage. I guess that works... complicated way of achieving the same, and you have to deal with the phase shift which you do not have to with integration but hey. Maybe monitor power factor...
  21. mxlemming

    FOC questions

    You really do not need to be filtering the fluxes, since they are integrals, then unless your current sensors are absolutely awful then they are already low pass filtered with a known constant phase shift. Adding filters with a time constant does not really help atall. Using this as the input...
  22. mxlemming

    FOC questions

    I do not think I can help with this, it works for me and all you said is "I attempted to copy it and it does not work" from which I infer you did not completely and accurately copy it, or have wrong parameters.
  23. mxlemming

    FOC questions

    Mihai, this is not a win. 3us dead time at 22.5khz is crippling, that's eating 13% of your available voltage. Sorry but this is just not a place you want to be for a high performance controller. 3us rise and 3us fall per pwm so 6us 22.5khz is 44.4us.
  24. mxlemming

    Modular, Multi-Platform, 300A ESC

    It can handle any erpm that any other low side shunt VESC firmware running board can. It's not really a function of the board, it's the firmware. This works out that below 60kerpm everything is fine. Up to about 120k things are usually fine but you start to lose some performance and above...
  25. mxlemming

    QS273 40h 5T -> increasing RPM and top speed

    Sounds like you need more field weakening. Or perhaps nucular24 limits the speed to a"safe"value since field weakening can cause spikes when it faults. There's a nucular telegram group that might be more help. Nucular Electronics i think this is the link. I don't know much about nucular. I...
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