No redesign yet. I still haven’t gotten the 4th and final motor for my wing running well. First I had a hall sensor not functioning for unknown reasons. Then I tried the 41F sensors mentioned in the last post, and they’ve been nothing but trouble. Each state change causes thousands of interrupts, which effectively freezes the CPU. Adding capacitors helped, but after much time PID tuning without getting it to behave well, I got sick of it and have been working on other projects. Next time I’ll give 41E linear halls a try, and if that doesn’t work then go back to U1881 and just keep trying if I get another dud.
I’d say this board design is a winner if you want to run on ~12V. The stacking idea is a bit questionable, since it will be a big pain to disassemble and replace a board if one dies. So far I’ve killed one of them, due to carelessness when tuning that hoverboard motor, which I’ve built into a lathe spindle. It was running reasonably well so I turned the voltage limit up a bit, but then went into a vibrating stall. I stopped it, fiddled some settings, tried again, and same result, except it quit working after a few seconds. I could barely smell the burning mosfet, but it is visibly damaged. By calculation afterward, it may have been running up to 80A.
