Hello,

I have an all steel 6090 CNC router with linear guides.

Attachment 436984

Currently i have this longs 23HS9442B in every axis (XYZ): https://ae01.alicdn.com/kf/HTB1pm9yd...716&width=1000
Active Current: 4.2A
Microstepping: 1/16

And i plan to upgrade with NEMA 34: https://www.aliexpress.com/item/32836484729.html

Why?
1) Because i can only hit 2000 mm/m velocity, if i go for 2500 on Y or 3000 on YX stepper will stall and my machine can benefit from more speed, i would like to have 4000 to 5000.
2) The high temperature, i had to put a 360º heatsink cover on steppers, without them my finger burn in a second can't handle more than 2 seconds, with the heatsinks is much better but still hot.
3) Closed loop seens better option to have

My questions are:

1) Driver support AC and DC, i read somewhere that not regulated AC is better for the driver, i understand that when using DC it will be rectified and filtered when not needed to and also drop a bit of voltage. Now with unregulated AC the voltage can fluctuate with with load, my question is if i use AC how good is the driver with the regulation, mantaining the same voltage over the load and if i should use it pior DC. Put a good capacitor at output is a good pratice?

2) On ac route i'm considering this to feed the 3 drivers: https://www.aliexpress.com/item/32821396714.html 1000W 220AC to 60AC. 60AC because 70AC seens a bit near the limit, and we know things can go wrong. Seller also recommend 60AC and says 200W is ok per set.
Is this Toroidal a good option? Also have search arround mouser but only find Toroidal with dual outputs which i don't need.

3) Motor will try to keep the steps and in a lose condition the driver will compensate, what happen if i send a move command that crash the axis to the limit of the granity and then stop the command? Motor will try to compensate and keep crashing forever or theres a limit?

4) My current motors in a crash condition will stall and have some kind of brake, with this much powerfull motors can it damage something with it stronger muscle or will behave the same?