Optimal voltage...

[Clive S]

Cheap to, but no stall detection.
Static current automatically halved. That’s interesting regarding to what m_c is describing below.
What are the benefits of them being able to run on AC?
The thought to go closed loop crossed my mind. I’ve only bought 3 steppers so far.

Using AC means you don't have to buy any caps or rectifier etc.
Manual here:- http://www.steppermotorcanada.ca/dm860h.pdf
I believe that stall detection only works above 300 rpm on the AM822.

I have three of these but not tested them yet but they look fine.

[john swift]

looking at the supply voltages for the AM822

the stepper driver has a simple linear power supply built in side
(bridge rectifier and capacitor)
so you can either connect it to an AC transformer or
a DC power supply


if you multiply the AC input voltages by root 2 (1.4142)
and subtract 2V DC to allow for the volt drop across the bridge rectifier

the input of 24V-80V AC will give you a DC voltage
very close to the DC input specified - 30V-110V DC

this has an advantage you cannot connect the DC supply the wrong way round !!!

John

[m_c]

Something that I've often wondered about the AC capable drives, is just how well can they handle fast deceleration?

A DC drive will dump the regenerated energy back into the supply, but an AC drive doesn't have that option. There are ways around the problem, but these drives aren't usually large enough to have much heat dissipation.

[JAZZCNC]

looking at the supply voltages for the AM822 the stepper driver has a simple linear power supply built in side
(bridge rectifier and capacitor) so you can either connect it to an AC transformer or
a DC power supply

Only the "H" series have this option. the common AM882 is only DC.

Something that I've often wondered about the AC capable drives, is just how well can they handle fast deceleration?

The cheap ones with AC/DC options don't handle it very well at all in my experience but better ones which often only have AC option I've never had a problem with. Much prefer to use DC supply with Caps on a fast router with decent weight gantry.

[waldeniojogos]

Only the "H" series have this option. the common AM882 is only DC.



The cheap ones with AC/DC options don't handle it very well at all in my experience but better ones which often only have AC option I've never had a problem with. Much prefer to use DC supply with Caps on a fast router with decent weight gantry.

Jazz, could you help me with my powerbox project, I got the same Lichuan Drivers and Motors as you did, but I am having some trouble finding some help on the installation. Could you share some of you project? You would help me a lot. Have you ever shared your project with anyone? I could not find anything here. my e-mail is [email protected] I really hope that you could help me with this! Thank you so much! And I will be looking forward to your reply!