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View Full Version : FOR SALE: 3 x 2.5Amp 30V Stepper Drivers



michael
15-07-2011, 06:07 PM
For sale,

3 x Driver 25PS (DiyCNC boards).
2.5 amp at 30v max.

4240

Only used for a short amount of time.

http://www.diycnc.co.uk/html/driver25.html

15 each.

jcb121
28-07-2011, 01:08 PM
would these be ok running from a cheap 24v 10a power supplies?

and could I hook it up to something like this http://www.diycnc.co.uk/html/pcpps.html

and have quite a cheap setup?

Jonathan
28-07-2011, 01:23 PM
They would run from that power supply. The problem is 30v (let alone 24v) is not enough to run most Nema 23 stepper motors effectively. The higher the voltage you run the motor on the higher the speed you can get since the torque drops off less rapidly. It's because the inductance of the stator coils limit the current that can flow at a low voltage... v(t)=L*di(t)/dt
You want at least 50V ... general rule is required voltage=20*L^0.5 where L is the motor phase inductance.

jcb121
28-07-2011, 01:30 PM
KK I'll be getting some others then,

sorry Micheal,

John S
28-07-2011, 01:31 PM
would these be ok running from a cheap 24v 10a power supplies?

and could I hook it up to something like this http://www.diycnc.co.uk/html/pcpps.html

and have quite a cheap setup?

Yes,
Providing you are not trying for a low earth orbit then yes they will work satisfactory and give you what you are asking for, a cheap setup.

Jonathan
28-07-2011, 01:51 PM
Yes,
Providing you are not trying for a low earth orbit then yes they will work satisfactory and give you what you are asking for, a cheap setup.

True, I might have been a bit quick to assume that he wanted to run the motors optimally. It would be cheap. I think it's the 3Nm motors... so they would have to be used in Bipolar-series which doesn't help matters.

I started off with 1nm motors and a unipolar stepper driver on my milling machine. It worked, but snails go faster than the 1mm/s it did.

michael
28-07-2011, 03:11 PM
Hi, I was using them to run some 23 frame 2Nm motors, easily did 600rpm which was more than enough for me.

With my 3mm ball screw I got feeds of 1800mm per min no trouble at 24v.

Cheers.

michael
06-08-2011, 11:14 AM
Items are now sold!

John S
06-08-2011, 11:59 AM
Good,
Now use the money to get a new avatar, the one you are using is butt ugly, it's even worse than the old one.

michael
06-08-2011, 12:03 PM
Good,
Now use the money to get a new avatar, the one you are using is butt ugly, it's even worse than the old one.

Cheers John!! Did you get the lathe back in good order? Will pop round to your sometime soon.

John S
06-08-2011, 12:35 PM
Yes thanks, Dan dropped it off the other day.

Bring coffee and hob-nobs

E.V. MacHine
13-08-2011, 03:10 PM
Yep! Right enough, belongs in a 'Special' Gallery; same one for Lee ('my clothing has 3 stripes') Roberts :-D