Originally Posted by
howardcano
Speedpro1 is correct, the current rating needs to be pretty high! Even a 17.5T motor on 2s LiPo will have a stall current close to 200A, and there are plenty of classes using motors much more powerful than that. But the current will only last a second or two, at the start of spool-up.
For 1S, most ESCs seem to be rated for 120A, but I'm not sure how that is for continuous/peak. A number of dyno graphs I've seen didn't pass 40A, but the acceleration was very high at low RPMs (so the the precision of the torque calculation isn't that good), so I suspect the flywheel used was a bit on the light side.
Originally Posted by
howardcano
(An observation: The ESC actually doesn't need to be a speed control; it just needs to commutate the coils based on the sensor signals and a single enable signal. That doesn't even require a microprocessor! But I don't know if that would save any money, considering how cheap off-the-shelf ESCs are these days.)
You'd need a microprocessor to do dynamic timing advance, right? Which is really what I'm after in terms of automating the workflow (being able to set the dynamic timing advance from the computer). If it's going to be "blinky" anyway (static timing advance), using a cheap off-the-shelf ESC would be fine.
I think there might be more hope in reverse-engineering the protocol of something like the TrackStar GenII 1S programming card interface.
