Splitting the topic here since this is not Lepton anymore but a completely new board. Keeping with naming, QVADRANS (worth two Leptons from Antiquity c.a. King Alexander Jannaeus of Judah from 103-76 BC).
Got a little time today and generally finalized the layout, pinout and component selection. Cost per board before shipping is $14/board for a batch of 10, I believe this is a very favorable value compared to B-G431b-ESC1 with very similar parameters.
I have no idea when I will finish this, my time is of very short supply.
nice! is it better to post an easyeda link or it’s not done enough for that? I’m definitely committed to using this kind of board, I don’t need nearly as much current capacity but that part isn’t very expensive. I don’t think I should try the mosquito because the processor on the lepton really was too slow and small unfortunately and I would fear similar issues with that. I need the fast g431 with it’s m4 core.
I have found uses for current sensing, for safety in the event of motor stall and other systems malfunction, and also for measurement of motor characteristics and some other stuff, plus the possibility of sensorless drive. I think sensorless drive is underrated, when the motor and sensor are a single unit you eliminate some important error sources and complications, not just cost. I think it is percieved as the cheapie approach but it’s not really, actually. Especially with IPD and stuff that works at zero rpm. Imo it’s the future in many ways, it’s largely a challenge of figuring it out, not from a technology standpoint but just understanding existing publications and stuff and writing some open source code to make it happen, and some adequate current sensing. To be fair, I am unclear on the precision etc. needed by the current sensing, so I would either over or under specify the characteristics… that’s a problem. But just leaving space on the board and some pads for shunt resistors, and wiring them to the op-amps and stuff on the g431 chip seems like a reasonable hedge. The b-g431-esc1 board seems to work ok.
Is this for Quad skate BLDC powered, battery in backpack concept? I’m actually building a pair of quad skates, and I must say there is not a lot of room for motors. Maybe on the back of the boot ?
Not even close. May be in a month, more like end of June.
No idea. It’s 30V / 60A (dual mosfets) but someone needs to load test it.