Stepper motor help...STM5776

[SweetAs]

Hi,

So my laser machine has developed an almighty vibration when moving the y axis back and forth. It runs off of a single motor mounted in the center of the machine, attached to a pulley which then transfers into a shaft through couplings and runs dual belts either side...if that makes sense.

We were running some precise but elaborate work this week at 150mm/s and I think this has damaged the motor, everything else seems to be fine so I am guessing that this is the issue.

The motor has the following on the sticker...

Model : STM5776 CE
4.2A (U) 1.8deg/step
www.autospark-tech.com

A+ A-
B+ B-

I have had a google and can only find a couple of pages that don't have any specs that I can figure out. Have any of you seen or used one of these? Any ideas on what I can use to replace it? It is running off of a DM556 if that helps any

Ive tried contacting the supplier but they are next to useless and I need to get the machine back up and running. I also tried the website....I have NO idea what is going on on there lol, there are pictures of scantily clad women and different chats about shipping companies to mobile suppliers and the marketization of Chinese enterprises

[john swift]

is the same motor used on the X axis ?

if it is, I would try swapping motors to see if the fault goes with the motor or stays with the stepper driver

what is the supply voltage powering the DM556 ?

using the rule of thumb from Geckodrives web site

ideal supply voltage = the square root of the motor inductance in mH x 32

with a 45V supply I would look for a motor with an inductance of 2.2mH
(you may find the nearest you can find is about 2.8mH )
and going by the label motor current = 4.2A

the NEMA motor sizes relate to the physical imperial dimensions
so a NEMA 17 will be 1.7" square and a NEMA 34 will be 3.4" square

John

[SweetAs]

Thanks John,

Ok so its a Nema 23. I never knew that about the sizes and Ive been using them for years....mind blown!

I have two power supplies in the machine, one with one live, which I am assuming powers the Nema 34 which raises the machine bed and one with 2 lives coming from it which I am assuming powers the 2 Nema 23s for the X and Y axis.

This is a.....

LRS-100-24
Input 100 - 240
Output 24v @ 4.5a

[SweetAs]

Pictures for reference.....

[john swift]

24V is lower than the 36V I expected

what is the other power supply rating

have you measured the supply voltage at the DM556 terminals
just in case the bootlace ferrule crimped joint has gone high resistance

John

[SweetAs]

I haven't checked the voltage but I can do that tomorrow just to make sure.

The other unit is a LRS-350-36 36v @ 9.7a

I'm on my mobile now so can't post a pic of it at the mo. Let me know if you need one. Thanks for the replies by the way John, it's very much appreciated