Re: 90v dc brake voltage

A bridge rectifier across 110 VAC will give you 155V peaks (110 x
1.414), no capacitor, a single diode will give 110 x .707 = 78 Volt
peaks.

I'm not sure why you would want 2 transformers back to back, unless
you're using an autotransformer, a tranformer with 2 windings is
automatically isolated.

Bernard

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Eric Keller
<unterhausen@y...> wrote:

> I have a Gidding and Lewis servomotor with a 90vdc
> brake. They suggest that I can just take the 115vac
> line from the wall, pass it through a bridge and use
> that for the voltage (there is something else in the
> circuit, but no isolation). That impresses me as a
> good way to kill myself.
>
> Since I don't have any isolation transformers, I was
> thinking about taking two transformers of suitable
> amperage rating and puting them back to back. This
> should work, right? Do I have to worry about
> saturation?
>
> On a similar vein, I was thinking that there is no
> harm in using a 3 phase transformer on a single phase
> circuit. Am I missing something in my ignorance?
>
> Eric "I'm going to die sooner or later, hopefully not
> today" Keller
>
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