Re: [CAD_CAM_EDM_DRO] How do i pick out a transformer?

twoextrememachine wrote:

>I'm finally ready to build a power supply which doesn't appear to be
>to difficult. But, I am having issues picking out a toroid
>transformer. I know i have approx 110VAC or the wall socket, and I
>need 100VDC and 20amps, which is the max for a rutex drive of course
>slightly underpowering my motors which i feel fine about. I'd rather
>under juice them than have the ability to over juice them. So when I
>look at transformers what should I look for, to get the desired
>output? I can handle the rest with the bridge rectifier and
>capacitor.
>
>

to get transformer voltage, divide by 1.414, so you need a roughly
70 V AC winding for use with a bridge rectifier. You could also use
a 140 V center-tapped transformer with a 2-diode rectifier.

As for current, somewhere in the 10 - 15 A range should be fine for
a 3-axis system. The transformer can take a momentary overload
when several motors are accelerating at the same time. If this is for
commercial, 8 hours a day running, then maybe go for a little more
current on the transformer.

Jon