H bridge

Also a possibility. Where can you buy it?

I also have some old granitedevices vsd e laying around. Great design up to 160V DC and each are able to drive 2 DC servos. This would be the perfect driver for your application. Unfortunately not buyable these days.

qwertyqwq wrote:

you can use this.
It is pretty good. All you need to configure your linuxcnc to pwm for each direction and you need to solder 3 wires. Thats it. No need to worry about deadtime or protection features. Without main mcu of this card , you can use just like a hbridge.
 

I don't see any schematic/code for this..
Anyway i will correct the H bridges with increased isolation distance and try it.
(maybe i will add also overcurrent protection)

Most of what other people posted are drives with some sort of PID control. If all you want is an H bridge and you'll control it externally there's no reason not to just rework the H-bridge you posted. With some work it'll be fine.

I will close loop in linuxcnc so linuxcnc will do all pid control.
Witch closed loop is better in terms of positioning accuracy-accelaration-speed-torque? 100% pid control with linuxcnc or positioning-speed-torque pid by servo drive
and additional positioning pid in linuxcnc ?

vre wrote:

I will close loop in linuxcnc so linuxcnc will do all pid control.
Witch closed loop is better in terms of positioning accuracy-accelaration-speed-torque? 100% pid control with linuxcnc or positioning-speed-torque pid by servo drive
and additional positioning pid in linuxcnc ?
 

Can't really answer that but Open loop steppers work fine in LinuxCNC and they generally only have a PID check for the step command, it's not feedback based closed loop. I don't use DC stuff but a MCU running decent a PID in firmware will always be faster than LinuxCNC but I don't really think you need it for an Axis. If you can manage to rework those Hbridges they will be pretty cheap so just try it and see how it works.

I see that there are a lot of different adum drivers but i dont know
if exists something better than ADuM4224.
H bridge except from better isolation and better mosfets
needs 1 error output (general fault/overcurrent)
and 1 enable input.
Current sensor like ACS712 or shunt will be better?