Re: [CAD_CAM_EDM_DRO] Re: VFD for series 1 bridgeport

on 2001-12-27 18:59:47 UTC

The inverter is for my 110 ton VERSON pressbrake w/ 15 hp main motor + 3 hp
stroke adjuster motor. Sorry about the confusion. I can run both my CNC's
(Bridgeport and SHARNOA) on the 10 hp x 3-phase inverter I presently have.

Rayhex

----------

> From: Jon Elson <elson@...>
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: VFD for series 1 bridgeport
> Date: Monday, December 24, 2001 12:20 AM
>
> Bill Vance wrote:
>
> > On Sun Dec 23 21:14:00 2001, Raymond Heckert, <jnr@...>

wrote:

> >
> > >Does anybody have any plans to make a high-power 3-phase inverter?

I'm

> > >thinking about charging a couple of BIG juicy capacitors through a
> > >full-wave bridge, and use a sinewave synthesizer (3 of them timed

16666

> > >microseconda apart) to feed a husky set of TRIAC's. I want about

15KVA at

> > >230 VAC 3-phase. Any help would be appreciated.
>
> Triacs? How do you turn them off if the supply is DC? You would want
> to use IGBTs. You should buy a used or surplus 20 Hp VFD on eBay.
> Playing with 400 V DC buses with 20,000 uF of capacitors is not for the
> beginner! I have built several inverters, and they were a bear. I had
> pieces of glowing power transistors shoot past my head, once in 'stereo'!
> I ended up 'firing' up that project from UNDER the bench, with ear

protectors

> on!
>
> Umm, why do you nead 15 KVA for a series-I Bridgeport? The largest
> motors were 3 Hp.
>
> Jon
>
>
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