Power Supply Suggestions please..

[Ricardoco]

How many machines are you planning on running?! That transformer is rated for 2500VA, so since 625VA is suitable for 4 motors, it could power 16!

From that site this one would be the best option:
Standard Range Toroidal Transformers: CM0625225: 625VA 230v to 2x25v
If you're planning on adding a 4th axis then the 750VA isn't much more and would allow you to do that. It's better to get the 2x25V transformer rather and put the windings in series rather than 50V and put them in parallel since if the secondaries are in parallel some current will flow between them (and not into the load) due to manufacturing variations, which could be harmful if significant. It's not very likely though. Another option if you do have to use a 50V transformer is to not put them in parallel and keep 2 seperate circuits with 2 drivers on each.

When you include postage and VAT this one is cheaper than airlink:
Toroidal Transformer 625va 0 50v 0 50v

Ok i figure if i must build a supply then i would really build one, i will be running other things requiring voltages less than 50v so this should cover the lot.

When i said i was going to do a "Big special" machine that is exactly what i meant.
Although i am using 4 steppers in the design that will only be providing me with 3 Axis, this machine will be having a 4th with quite a few other gadgets, i was going to go for Din rail supplies so i could add more as and when i needed them, but it is very much easier to just add a din supply that build another power supply.

So now i have opted to go down this road ive got to build in for the other stuff i will be fitting... Admittedly 2500va is a lot but i do like the 4x50v besides which its going to cost me more than that just to have the frame powder coated, as you may be becoming aware im building this thing for keeps...I may get a tad smaller transformer Ive got to do the math first.



Rick