Just Use a VFD or converter! was Re: why not just change the motor?

jeffe,

I'd use the VFD. For all the reasons already elaborated. But
especially because time and effort will be MUCH less by using this
approach. If I absolutely couldn't use the VFD (and I can'tr think of
why that might be, but let'' just say that perhaps a fear of
programming, or electricals is the reason...)

Then I'd use a static or rotary converter. And if electricals are a
personal problem, I'd use a good static type and be done with it. But
at this point I've probably spent as much to use the static converter
as the VFD, and the installation of either converter is at least as
difficult as the VFD; so why? (The rotary DOES have the advantage of
powering more than one machine, but costs more.)

Bottom line for me is what makes you thinnk that using a single phase
motor is going to be easier? (You've already said you don't mind that
its more expensive?!?!) I can't think of a single reason why using a
single phase motor is a better choice! (unless you ALREADY have one
that fits... And EVEN then, it's going to take more changes--kludges--
to the machine wiring to use this than to use the VFD!)

Use a VFD. You'll be glad you did...

2nd choice would be a converter IF you have one already, OR can
assemble one from parts--by building from parts you "might" spend a
bit less money, as I've made static converters in the 2HP range using
start and run caps for under 100 bucks.) A 2hp rotary can also be
made for less than a hunnerd bucks...

The single phase motor just doesn't make sense no matter how you look
at it, IMO...

Ballendo

P.S. Don't discount the info you've been given about the "roughness"
of single phase motors compared to three phase... (I'm REALLY looking
for what might possibly be a reason to use the 1ph. motor... And I
can't find it!)


In CCED, "jlsmith269" <jlsmith269@y...> wrote:

>Or, heck, let's get to the heart of the issue, if *I* bought a 2 hp
>boss 8 cnc, 3ph, I would NOT bother with a vfd on it.. i would get
>the wiring and motor from a 2 hp 220 1ph , and bolt it on... and
>yeah, I would spend DOUBLE or more for that simple solution, rather
>than kludge it, knowing I am introducing unknowns into a pc-cnc/enc
>setup.
>thoughts?
>jeffe
>