I'm working on a DIY BLDC servo to use on my 3D printers to replace noisy NEMA17 steppers.
I want to try use the 42BLF01 BLDC motors as they have a similar form factor (NEMA17).
They need about 1.7A per motor and I will have up to 5 of them.
Not very heavy load but pretty dynamic.
Cheap power supply from Meanwell:
240W or
480W.
Its not a one time braking event in the normal operation, but can be in some cases: It will be 3 phase H-bridges PWMing around, plus catastrophic events like sudden stop/crash/power failure while the axis are moving/user moving the carriage while the machine is off.
With large enough caps I can absorb the normal back-emf in a sort of regenerative fashion. But high voltage caps are expensive and I hate electrolytic caps for their unreliability/limited life.
I was thinking of putting about 100uF in ceramic caps (10x10uF) on each driver PCB and backing it up with some large electrolytic ones on the power supply protection/cap buffer module.
But I can't go above ~35V voltage rating without everything getting extremely expensive. So I'm looking for a way to get away with 35V rated caps on the 24V rail and not having it blow up everytime something does not go according to plan