Re: gecko's and voltage

Kim,

I try to produce good drives. I am a designer and I put my best into
it. I have the privelege of being a gradutate EE and having spent 30+
years in designing power analog circuit circuits. I eat, dream and
sleep with this stuff. I also have seen everything when it comes to
motor drives. There is also nothing new to me when things go wrong.

Being a practicing EE I'm also aware of everything that's out there
and I can work out the complex matrixies of how how price and
performance integrates with the final product.

A good design is an inticate dance that delivers the expected
performance while using the minimal possible parts. It is a Zen or
Haiku poem kind of a thing. It delivers to the customer the lowest
possible price a product while giving the best possible performance.
If done right, it is balancing things on a knife's edge.

What that means is every little resistor, capacitor, diode and
transistor is working for you. You have paid for them and you expect
that. Like a Haiku poem it is sparse, interconnected and necessary to
the whole. Nothing is wasted, nothing is wanting.

Being that way, it cannot be disturbed without destroying it. It
cannot be made to run at 100VDC or 120VDC. If it could, I would have
cheated my customers by having this unrevealed but paid for ability.
I would haved failed as an engineer.

You say you are a EE. I would guess you are young and have not yet
learned all your craft has to offer. It is a beautiful proffession
that can teach you so much if you have the humility and an openness
of mind to recieve all it has to teach. It is subtle and intricate
beyond belief. Like nature, its mother, it speaks quietly and doesn't
care if you didn't listen.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> On Sun, 2003-07-06 at 09:40, mmurray701 wrote:
> > > This situation is NOT a matter of petitioning, but
> > > rather a matter of considering the end user requirement. Yes,
> > using a
> > > larger voltage transistor may increase the price of the driver
by
> > $10 or
> > > $40, but it will decrease the transformer cost by $100-$200.
> > Every try
> > > to buy a 1.8KV oddball voltage transformer ?
> >
> > Well, instead of using a huge oddball oddball transformer,
>
> Stepdown transformers are not oddball. Hammond for one makes them.
Go
> to any electrical wholesaler and they can get you one. Nothing
oddball
> about that, right ?
>
>
> > why not
> > use a bunch of smaller more common ones? MPJA has 24v 10a
> > transformers for $17.99. Two of these in series will give 48v AC
and
> > roughly 67V DC when rectified.
>
> 1.8KVA / 240VA = 8 transformers, not, not 6. I'd have to double
the
> size of my CNC electrical box.
>
> > This is what I plan to use for my
> > Gecko servo system. Did I miss anything? Should work fine right?
If
> > you need more than 10a (sounds like you do) just add additionaly
> > sets of whats described above. If you were to go with 3 sets of 2
(6
> > total) that would give you a 67v 30a supply (2.0KW) and all 6
> > transformers would still only cost $107. Dont seem too expensive
to
> > me.
>
> That is an ugly solution. When was the last time you went into a
> commercial piece of equipment and found 6 transformers ?
>
> > > We ? Does that mean you work for Gecko ? If I guarantee my
> > supply will
> > > never exceed 100V ie use a zener protection circuit set at 90V,
> > can I
> > > use a G320 at 87V ?
> >
> > Mariss is the designer of the Geckodrives. Any advice received
from
> > him should be strongly considered. He really knows his stuff.
Good
> > luck.
> >
> > Mark
> >
> >
> >
> >
> >
> > Addresses:
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> Kim Lux <lux@d...>