Re: Transformers

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Stevenson" <john@s...>
wrote:

> Transformer shouldn't be a problem as we can get custom ones wound

here with not a lot of problem.

>
> I have a nice one here that outputs 33,000 volts at 5 amps. Is

California looking for a new electric chair ?

165,000 watts or 165Kw. What in the word do you do with it and were
would you get enough power to use it!!!

Our houses in the USA typically have a 220v at 200 amp service.

44,000 watts or 44Kw.

Wally



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Stevenson" <john@s...>
wrote:

>
> > Hi John
> >
> > Just a couple thoughts...
> >
> > If 20 amps is your maximum peak current per motor you would

certainly

> > want to have that capability to prevent nuisance tripping in full
> > accel 3-d diagonal moves.
> >
> > However, depending on the machine, average current requirements

will

> > probably
> > be much less. In my large low friction router avearage cureent is

less than

> > one quarter
> > the peak capability.
> >
> > So I rate the transformer accordingly. The supply capacitor can

deliver the

> > full current for short periods just fine...like a fast ramp up or

ramp down.

> > I can calculate the cap size requirements but I must know a bit

about the

> > machine dynamics.
> >
> > One other thought I would offer...if individual motors are fused

and only

> > one
> > fuse blows, the others will perhaps keep going resulting in an

unforseen

> > path
> > and a possible crash scenario. The estop system must be such that

if any one

> > axis
> > Malfunctions all axes stop. A stop on following error or similar

system can

> > do this.
> >
> > As far as transformers for UK use I am not sure. Custom toroid

kits with a

> > pre-wound primary
> > and customer wound secondary (about 1 volt per turn) are commonly

available.

> >
> > Les
> >
>
> Les,
> This is for a Bridgy Series l conversion using 110volt treadmill

motors as 100 volt servos.

> There will be no 3D moves only two axis will be cutting at any one

time, all my work is 2 - 1/2D.

> Good point about the fuses, This can be accomplished by power on

relays wired into the stop circuit.

>
> Transformer shouldn't be a problem as we can get custom ones wound

here with not a lot of problem.

>
> I have a nice one here that outputs 33,000 volts at 5 amps. Is

California looking for a new electric chair ?

>
>
>
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