[TheForge] Frequency Converters

[Darrell]

Chuck,
Take a look at the Dealers Electric site at the motor/VFD packages. The
motors are rated for VFD use.
Darrell

http://www.machinemaster.com
----- Original Message ----- 
From: "Steve Smith" <sos at alum.mit.edu>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Thursday, September 23, 2004 5:22 PM
Subject: Re: [TheForge] Frequency Converters


> The missing piece...I hadn't realized you wanted variable speed. You are
> right on the mark.
>
> Steve
>
> Chuck Robinson wrote:
> > I don't know how I could make one of those single phase AC motors
variable
> > speed, except by changing drive wheel diameter.  What am I missing?
> > Variable speed control is paramount in my grinding operation.
> > Chuck
> > ----- Original Message -----
> > From: "Steve Smith" <sos at alum.mit.edu>
> > To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> > Sent: Wednesday, September 22, 2004 6:15 PM
> > Subject: Re: [TheForge] Frequency Converters
> >
> >
> >
> >>Well that explains a lot. Burden's is the place with all the good stuff.
> >>I thought the other URL was Burden's. Thanks for the correct address.
> >>
> >>Why not go with one of the single phase motors? They've got some 5HP
> >
> > motors:
> >
> >
http://www.surpluscenter.com/sort.asp?UID=2004092218080590&catname=electric&
> > keyword=MBAL
> >
> >>some of which are cheaper than your 3HP. Also, note that a VFD will cost
> >>you more than any one of the motors.
> >>
> >>Steve
> >>
> >>Chuck Robinson wrote:
> >>
> >>>Hey Steve,
> >>> Wrong company.
> >>>The motor I'm looking at is at
> >>>http://www.surpluscenter.com
> >>>The motor would be used to drive a variable speed 2" x 72" heavy duty
> >
> > belt
> >
> >>>grinder for hogging out hammer billets.
> >>>All ready using a 2 hp dc motor and speed controller, But it stalls
> >
> > under hi
> >
> >>>load conditions.
> >>>Chuck
> >>>
> >>>----- Original Message -----
> >>>From: "Steve Smith" <sos at alum.mit.edu>
> >>>To: "Sponsored by ABANA" <theforge at mailman.qth.net>
> >>>Sent: Tuesday, September 21, 2004 7:35 PM
> >>>Subject: Re: [TheForge] Frequency Converters
> >>>
> >>>
> >>>
> >>>
> >>>>Chuck Robinson wrote:
> >>>>
> >>>>
> >>>>>Hey Folks,
> >>>>>I don't know my ass from my elbow about frequency converters, but the
> >>>
> >>>latest
> >>>
> >>>
> >>>>>Surplus Center  flyer has  a Leeson 3 phase 3450 rpm motor advertised
> >>>
> >>>for
> >>>
> >>>
> >>>>>$150. Item # 10-2041.
> >>>>>Is this a good candidate for FC controller?
> >>>>>If so what is a good source for the FC and approximate price?
> >>>>>Chuck
> >>>>
> >>>>Chuck, I'm not finding your motor on the Surplus Center's web page (I
> >>>>assume you mean http://www.surplussales.com/ ), so I can't help you
> >>>>there. It looks like their web page isn't fully cooperating with
> >>>>Mozilla. Note that used three phase motors (scrapyard, auctions) often
> >>>>go cheap.
> >>>>
> >>>>I think you're talking about a Variable Frequency Drive (VFD); a box
of
> >>>>electronics which produces three phase (variable frequency) out of
> >>>>single phase or three phase. A good source is:
> >>>>http://www.dealerselectric.com/
> >>>>Note that they sell a package deal on a VFD and a motor. To see their
> >>>>VFD's, click on "Browse our Inventory" then "Variable Freq. Drives".
> >>>>They are very helpful on the telephone. I bought an FM100 from them
for
> >>>>my mill (which of course I haven't had time to put in yet...). A
couple
> >>>>of things to note about VFD's:
> >>>>1. You can't hook the VFD output up to a bunch of wiring with
different
> >>>>machines on it. The VFD must drive your machine directly, not even
using
> >>>>the switch on the machine (there are ways to work this, just not
> >>>>directly). Otherwise, the VFD can be damaged by a no-load condition.
> >>>>2. You can get units up to 3HP that will take single phase input and
put
> >>>>out three phase output. Above 3HP, you need to derate by one step if
you
> >>>>have single phase in. For instance, if you want to run a 5HP, 3 phase
> >>>>motor off single phase, you need to use a 7.5HP VFD.
> >>>>
> >>>>If you don't already have a three phase motor, it may make more sense
to
> >>>>buy a single phase motor. This is probably cheaper than buying both a
> >>>>three phase motor and a VFD.
> >>>>
> >>>>Steve Smith
> >>>>_______________________________________________
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> >>>>
> >>>>
> >>>
> >>>
> >>>
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> >>
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> >
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