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RE: [TCML] Variable RSG
Try Harbor freight tools, they sell a router speed control around 20.00
often on sale 10.00-12.00 works pretty good on motors up to 1 1/2 hp.
Ken
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Tim S
Sent: Wednesday, April 09, 2008 12:22 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Variable RSG
dc you have not replied to my personal emails of those devices...ami being
in the spam folder?
tim
sorry if this is list burdening,,,
tim
rply directly please,,,thx
DC Cox <resonance@xxxxxxxxxxxx> wrote:
Bart
Have you had any problems with the VFD setup being affected by the RF or
magnetic fields under the primary coil, eg, in the base when the RSG is
placed? Especially with DRSSTCs with their extremely high primary currents
and fast switching speeds producing large pulses in controller wires, etc.
Does anything kick back into your controller causing full speed lockon, or
do you use some filters of some type between the RSG motor and the
controller which is usually at a remote location?
Dr. Resonance
On Tue, Apr 8, 2008 at 8:07 PM, bartb wrote:
> Hi Scott,
>
> I meant to reply to your thoughts about Grainger, but deleted the email
> and emptied trash. So writing this under and new subject.
>
> Anyway, yes Grainger does have some decent prices. But, for AC speed
> control, price is HP dependent (even at Grainger). If motor is under
1/4HP,
> you can pick up a speed control for $34. But for something like a 1HP
motor,
> you head to the $170 range minimum. I use a 2HP Baldor myself. This of
> course gets even more expensive for speed control. Even at 1HP, your
already
> at VFD prices. The motors themselves are cheap and 3-phase is likely the
> least expensive. For DC motors, the price can get very high in the 1HP
> range. This is where eBay comes in real handy.
>
> Adam and myself are using a VFD to control a 3-phase motor and vary speed
> with a simple potentiometer. My Altivar31 2HP VFD is expensive at $300
each
> off the shelf. No matter how you slice it, as HP is increased, variable
> speed will cost a bundle between the motor + controller if purchased as
new
> (even at Grainger). I think eBay is still probably the best way to beat
> these enormous prices.
>
> BTW, I should let everyone know I have a brand new (in box complete with
> 375 page manual) ABB 3HP VFD for sale which list in the $500 range. I'm
> letting it go for $200. P/N is ACS350-01E-09A8-2, 1-phase 200 to 240, 21A
> and 3-phase 230V out, 9.8A, 0 to 500 Hz variable frequency. I haven't used
> it and I don't know any of the details. Should not be too difficult to
> figure out.
>
> I also have a used 2HP SquareD Altivar 31 VFD for sale for $125. Works
> perfect! Don't have the p/n handy, but it's 1-phase 200-240 in and 3-phase
> 230V out with 0 to 500 Hz variable frequency.
>
> If anyone wants these, they should contact me at bartb@xxxxxxxxxxxxxxxxx I
> will also offer a money back guarantee that these VFD's are "both" in new
> working order. In order to use these VFDs, it is necessary to pick up a
2HP
> or 3PH 3-phase motor for them (as appropriate to the VFD HP rating). Check
> eBay. Sometimes these motors can be found for around $50. I have only one
> spare 1HP 3-phase motor on hand, but it doesn't match these particular
> VFD's. However, if you come across a VFD or speed controller requiring a
> 1HP, 3-phase motor, I will sell it to you for $50.
>
> BTW, for those that don't know, Leeson (major motor manufacturer) just
> announced that they are off to Mexico to build their motors! Cheaper labor
> I guess.
>
> Take care,
> Bart
> _______________________________________________
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> Tesla@xxxxxxxxxxxxxx
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>
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