[TheForge] Inverters

[Ben Barrett]

Thanks for the clarifications, y'all.  Could a power regulator
(specifically, one that maintains voltage and creates a clean
sine wave) from the computer realm be used?  Granted, the
ones I've seen are 110VAC, not 220... some are designed
to be modular, in-line with UPS battery banks, some w/
generators, etc.

If such a unit was available, would it be worth it?
(Or, are the better inverters much more efficient?)

ben


On 5/27/07, xlch58 at swbell.net <xlch58 at swbell.net> wrote:
> Generally  the whole point of resistive vs inductive loads for an
> inverter is those designed for "resistive only" generally produce a
> funky AC wave form, or they operate at a nonstandard or unregulated
> frequency.   A resistive load is pretty much unaffected, but an
> "inductive" load is designed to take advantage of the AC wave form at a
> particular frequency.  A standard AC motor operated at the wrong
> frequency for example, will run at a different speed.   If the AC wave
> form is funky, it can cause a motor to overheat.  As far as inverter
> based welders, they have transformers in them.  These transformers may
> or may not tolerate hijinks with the input wave form.   All common
> eletric motors depend on induction to work, but some, so called
> universal motors, are less finicky.  They are called universal because
> they are capable of running on AC or DC.   Many small power tools use
> universal motors.  They will probably operate ok on an inverter designed
> for "resistive" loads.
>
> Charles
>
> Marc wrote:
> > An inductive load is basically a coil of wire - any kind of coil.
> > Electrical motors are coils of wire, so they're all inductive loads. OK,
> > maybe there are some strange things like electrostatic motors that
> > aren't inductive, but I think you get the idea. And non-inverter
> > welders, like buzz-boxes, are also inductive, because they've got these
> > big transformers in them.
> >
> > Inverters also have transformers but I'm not sure if they look
> > inductive. There's some transistor circuitry in there that may change
> > the characteristics. Also, their transformers are much smaller, as they
> > work off a much higher frequency than the 60Hz line, so they will not be
> > as inductive as the bigger buzz-box transformers.
> >
> > And - if you want to get reeeeeeeally technical, all loads have some
> > inductance, but things like light bulbs are so low as it doesn't really
> > affect anything we care about.
> >
> > --Marc
> >
> >
> >
> > On Sat, 2007-05-26 at 08:55 -0700, Ben Barrett wrote:
> >
> >> Well certain [electric] motors are induction-run.... things like
> >> lights, most heaters, etc, are resistive... I'm pretty sure the
> >> standard arc welder is resistive.  Induction uses EMF from a coil, and
> >> often involves pulsation (some frequency, similar to AC [vs DC]) and
> >> sometimes higher voltage as well.
> >>
>
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