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  1. H

    Low Volume Death Bike Like Kits

    I have pictures of my skateboard motors somewhere, I'd have to dig them up. Bigger motors under nda
  2. H

    Low Volume Death Bike Like Kits

    I like designing and building motors. I haven't had an ebike since 2012, cromotor v2 days. 8kW. Then I went to the MB-5 30kW build and became scared of that. Life is short though, right? now it's time for dual bac 8000. I like the idea of a safer version of Luke's deathbike. A small production...
  3. H

    1 Cell Inverter Project

    Will I still be able to run at 20kHz to make the motors nearly silent? Seems like onewheel only manages 18kHz. Still prettty high, but I wonder if they chose that because of switching losses Why am I drawn to the GaN.. why do I want the GaN...
  4. H

    1 Cell Inverter Project

    Can you show me how to maximize the amount of the GaN fets in parallel with the proper gate driver and catch diodes? Zero idea what I'm doing.
  5. H

    1 Cell Inverter Project

    WHat about these babies? https://epc-co.com/epc/Portals/0/epc/documents/datasheets/EPC2066_datasheet.pdf I'm pretty sold on these. 33nC? wouldn't that allow me to run like 10 of these in parallel with standard drivers? Also logic level.
  6. H

    1 Cell Inverter Project

    I'm not sure those are available in high volume, I rather use some dc dc chip and put it all on one pcb with the inverter. I'm not sure going from 5 to 12V is worth that 30% reduction in on resistance. For the space of the extra components for 12V I might be able to afford to double my 20V...
  7. H

    1 Cell Inverter Project

    I see what you mean, however, they would be driven by the 5V rail in my mind, which I didn't clarify earlier.
  8. H

    1 Cell Inverter Project

    I've already done it crudely, don't really want to prove out nothing with a sub par controller. I really don't mind taking the time to do it properly, even if it takes a few spins to get it working. I also would like to try to over build the controller to be able to handle higher current like...
  9. H

    1 Cell Inverter Project

    Would I be better off with the single channel or the quad channel? I kind of want to integrate a low side short circuit protection switch (and to act as solid state power switch for powering on the device) into the inverter. Maybe I could use 3 of the channels for the phases and 1 for the...
  10. H

    1 Cell Inverter Project

    Would direct fet logic level 20V parts be worse for some reason?
  11. H

    1 Cell Inverter Project

    I don't know if mp2 is the right fit. I rather get even more compact and have assembly house put the fets on. Are direct fets going to be around for a long time?
  12. H

    1 Cell Inverter Project

    haven't built the motor yet. I built a 7S version before. I don't really want to do a proof of concept ESC, I already did that once crudely. I want to build something reliable that will fit within a 12mm enclosure ideally and be eventually saleable. MOSFETs x gate charge per mos x switches...
  13. H

    1 Cell Inverter Project

    Right but how many would I need? Each is 500mA at 12V at 2.5V input voltage. I'm not sure what I need to drive say a 12 FET version using the above toshiba part. Also worth noting the polulu part you linked needs 2.7V to start up, which may or may not be an issue with LFP cells. I can set the...
  14. H

    New USB C PD3.1 standard allows 48V 5A 240W charging

    You oughta know if you're designing battery packs. I'm going to step it down to charge my 1S battery at 50A. Don't you love everything about the way technology is progressing? Can you imagine it getting better?
  15. H

    1 Cell Inverter Project

    See this new toshiba part. I'm curious if it will be fine in a 6 fet configuration. It is only 0.3mOhm. 60A going through two fets (0.6mOhm in series) that's not even 3W continous i^2*r loss at the fet. Burst up to 150-200A that becomes 13.5-24W. No? I only really need to burst to 100A, but...
  16. H

    1 Cell Inverter Project

    Generally speaking 1S is a bitch, yeah, but the trade off for me is worth it: more copper in the slots, slightly smaller diameter motor, and single pouch cell battery less than 12mm thick with simplified or eliminated bms. Completely worth it for me. All I really have to do besides the...
  17. H

    1 Cell Inverter Project

    I did it 4 years ago and would have to dig it up. It all really comes down to the fets and connections. https://toshiba.semicon-storage.com/info/XPQR3004PB_datasheet_en_20230609.pdf?did=147477&prodName=XPQR3004PB
  18. H

    1 Cell Inverter Project

    cannot comment on the 50mOhm target you have.. but as you know I'm sure.. thicker everything, shorter everything, not that hard, considering only 150-300W continuous. Basically a 27Ah nmc pouch cell + not even 2 feet of 6AWG. not completely sure practical on an ebike application but fine in...
  19. H

    Modular, Multi-Platform, 300A ESC

    reserved
  20. H

    1 Cell Inverter Project

    I am interested in making a 150-300W continuous controller that will run on 1 cell. I'm wondering which threads, books, or web articles you would recommend to get up to speed on inverter design and testing. I'm aware of Arlo, Lebowski, and zombiess as some of the pioneers on endless-sphere, but...
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