H bridge

Hello.
I have an old plasma cnc with 2 X axis dc motors 1 y axis 1 z axis all 110V 250w
Distance measurement is done by 4 external rotary encoders connected with pinion to each rack.
So i need 4 h bridge drives to drive them and get encoder feedback to linuxcnc.
Can i get 2 simple chinese dual motor h bridge drivers that are upto 36v and replace mosfets with higher voltage mosfets?
pwm correspods to increased voltage output that means increased rpm
How can config the pid of such h bridges with FF1 and P same as analog +-10v speed drivers ?

You can change the mosfets but that would also require adding voltage regulators as the mosfet drives will not handle more than 36V, and even then it might not work due to high side/low side driving and potential diferences.
It is much safer and easier to get some servo drives for brushed motors, like Geckodrive or Pico Systems PWM drives.
Geckos do have encoder inputs so the loop is closed in the drives (not sure if Pico can do this) and take normal step/dir control signals like a stepper drive, require easy tuning and can also be set to have the loop closed in the drive and LinuxCNC. They can handle 80V, but i would really, really not use anything above 50V.
There are also some yellow servo drives that can handle 160V but i never used those so no idea how good they are, same goes for Pico they have 120V or 160V drives, i think.
Just to be clear, you can use 24V or 36V drives and make the machine work properly, just the speed will be limited, and maybe acceleretaion depending on the mass the motors have to move.

hi vre

I was using the same dual hbridge for my old cnc but unfortunalty they are not good and wont take took long to drive motors. Especially if you dont really know the switching periods. And also those boads has dc/dc converter circut that not properly designed. I have repaired tens of boards before i build my own high power and high voltage drive.
If i remembered correctly there were pair of ir2184. This chip has very low sinking and sourcing current so must be taking into account this parameter before changing mosfets. Otherwise this may cause swithing error and miss fires.

Yes. Definately a nogo with the chinese boards. Every (yes every) board I had in hand was a pain in the a...

To be honest. Get 4 CL stepper or if you really wish (no need for plasma) 4 new servos. Much cheaper and way more easier!

It is not easy to replace current motors because are 4800rpm coupled with massive reducers.
What about this H bridge?
www.electronics-lab.com/project/15a-100v...-half-bridge-driver/
it is 100v with nice mosfet driver..

Also these 1kw servomotors are very cheap has anyone tested?
www.aliexpress.com/item/1005006235760809.html

vre wrote:

It is not easy to replace current motors because are 4800rpm coupled with massive reducers.
What about this H bridge?
www.electronics-lab.com/project/15a-100v...-half-bridge-driver/
it is 100v with nice mosfet driver..

Also these 1kw servomotors are very cheap has anyone tested?
www.aliexpress.com/item/1005006235760809.html

I don't think I would trust that H bridge above 80VDC, the mosfets have a 100v VDS and the cap is 160v, there's no safety margin at 100v. The ground plane doesn't look like it has proper clearance from V+ trace either @ even 80v. It does use an Adum isolator/gate driver which is neat. I use Adum isolators all the time and they're not cheap, didn't realize they had one with an integrated gate driver. Schematics are on the page, could easily redesign and fix it.