Re: RE: Transformers

> 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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