my name's Andreas and a few days ago I found the VESC while searching for brushless controllers that are FOC capable.
Well, there are quite a lot controllers for brushless motors on the market, some are reasonable good, some are cheap, a few are both. However, due to the nature of these controllers to mostly work on whatever motor you connect to it, the control algorithm actually can't really be ideal, because the controller doesn't know anything about the motor attached to it. They probably all use block commutation.
Now the VESC can do what I would like a good controller to do, FOC and also current control or RPM control mode. And there is a motor setup procedure (wow!), in order to have an optimized control algorithm and superior efficiency, which is mighty important in racing those little cars. But I have a few questions, as due to being an mechanical engineer myself, I naturally am a bit at war with everything concerning electrical engineering...
One thing, I was wondering about, the 3S restriction. At least for the 10th scale cars, only 2S lipos are being used. My guess is, the mosfets need at least around 8V at the gate in order to have a low enough Rds. So what happens, if I would use logic level fets, like the IRL40SC209 https://www.infineon.com/dgdl/Infineon-IRL40SC209-DS-v02_00-EN.pdf?fileId=5546d462557e6e890155a1413329602d ?
I'm not familiar if things like higher tr or tf values or lower Qg would cause any issues. Does the lower voltage cause problems with other parts used in the design? The fets specs sure are nice it seems.
Another thing, about the sensors, in the documentation it says, hall sensors are less accurate. But that means, that FOC mode is still possible using those, does it?
I might want to use it in a 8th scale buggy, too, just like Benjamin did himself. I already have a motor, with 1700KV, 2 pole pairs @4s (16.8V fully charged) it means it is very close to the 60.000 ERPM, but it should work. I hope, the VESC can handle the power (~400W average and 2000W short peaks at 4S).
I'm eager to test this nice device. I'll probably buy the Hobbyking SK8 (=HW4.10) Version, because it is very cost effective.