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

Robert Miller wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "twoextrememachine"
><twoextrememachine@y...> 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.
>>
>>
>
>----------
>Always go heaver than you think you need with toroid xfmrs.Remember
>they dont have a iron core which helps to stabilize surges
>(reluctance).A toriod coil (air core) can delever masive amounts of
>power for a very short time,but long enough to fry electronics. The
>big thing is regardles of how much power you have avalable they make
>fuses in all shapes and sizes.USE ONE FOR EA DRIVE.
>
>

Huh? What are you taling about? Toroid transformers definitely DO
have a laminated iron core. The only difference is that the core is
wound from a single strip of thin steel sheet, instead of a stack of
laminations assembled with bolts. A toroid transformer is NOT an
air-core transformer.

Jon