Re: [CAD_CAM_EDM_DRO] 3 Phase/VFD question

I have a SHIZUOKA NC mill (converting it to CNC) and
don't know what the motor rating is. The nameplate is
on there. I'll have to recheck. Question is I'd like
to get 1 VFD for 2 different machines, is that
possible? How do I properly size the VFD for the Mill?
Where in the Rutland catalog can I find this and what
else is the VFD called?
Would it be better to make a motor mounting plate and
install a 230 1 phase motor?
Thank You,
Ron Petersen


--- Bill Vance <ccq@...> wrote:

> Hi Jan;
>
> Not sure what I did with that catalog at the moment,
> but I do have another.
> According to the Airgas/Rutland Tool catalog, there
> are several models, and
> the RPMs listed at 60 Hz input are, 1710, 1725,
> 1740, and 1750. and are rated
> at 1 to 3 horsepower.
>
>
>
> I'm looking at the two one horse models, and the
> first is a TEFC-NEMA 56,
> weighing in at 31 lbs., and the other is a TEFC-IEC
> B3 foot mount D80, weighing
> about 13 lbs. Those are shipping weights. They are
> rated at 1725, and 1710
> RPMs, respectively. Sounds like the second one
> might be better for the Z axis
> spindle on a vertical mill, whereas either should
> workfor a lathe spindle, yes?
>
> Bill
>
>
> On Tue Jun 1 16:31:17 2004 JanRwl@... wrote:
>
> >In a message dated 6/1/2004 1:31:00 PM Central
> Standard Time,
> >ccq@... writes:
> >motor that was rated, if I remember correctly, at
> 1792 RPM. A VFD I've
> >looked at has a frequency rating of .5 to 360 Hz.
> If combined, what would be the
> >output range of RPMs
> >from the motor? Do I divide 1792 by 60, and then
> multiply that by 360, or
> >what?
> >
> >Bill: I may be wrong, but I THINK this strange
> number, 1792, is the result
> >of taking the 1800 RPM "sync. speed" and deducting
> some (theoretical quantity?)
> >value "speed derating". You absolutely sure you
> have the number exactly
> >correct? Because 1782 = 99% of 1800 RPM. If you
> run a standard "1750 RPM" motor
> >on 60 Hz. with no load, or VERY little load, it
> will run at exactly 1800 RPM.
> >Same for a "3450 RPM" motor: 3600 RPM. ANYway,
> you would get the correct
> >result with your algorithm, but the CORRECT
> proceedure would be to divide the
> >VFD's output-f by 60 (or 50, if in almost anywhere
> in the rest of the world),
> >and then multiply the 1792 or 1750 or 3450 or
> whatever "name-plate RPM" by the
> >result. (I understand that 360 Hz. is generally
> the highest f you can get "in
> >the U.S." (60 Hz. mains), but in Europe with 50 Hz,
> you can get up to 400 Hz.
> >Has something to do with the "explosion speed" of
> motors or some-such
> >old-wives' tale spec. I dealt with a rotary
> f-converter I installed in England,
> >once, and I PROMISE, though "all went well, and
> worked, and I was paid", I don't
> >EVER wanna hafta mess with such again! Whew! TOO
> Much iron and copper for ME!
> > Jan Rowland
> >
> >
> >[Non-text portions of this message have been
> removed]
> >
> >
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> Google.com to reach it if you have trouble.
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>
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> consider this to be a sister site to the CCED group,
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> subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC
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