RE: [CAD_CAM_EDM_DRO] Re: QUESTION ABOUT SERIES OR PARALLEL ON STEPPER MOTORS - ref post 52721

>I thought I was understanding this and all of a sudden I'm confused again.
>I thought that the ratio of DC voltage across the bridge rectifier (across
>the cap) was 1.414 times the secondary AC voltage of the transformer. For
>example,
>
>My two tap combinations assuming my line voltage is 115 volts:
>
>Primary Tap Secondary tap Measured secondary voltage X 1.414
>
>115 volt AC 44 volt AC 44 volts AC X 1.414 = 62 volts DC
>
>or
>
>105 volt AC 44 volt AC 48 volts AC X 1.414 = 68 volts DC
>
>
>Am I wrong in the above?
>
>Thanks for checking my figures.
>
>Regards,
>Jeff
>
>-----Original Message-----
>From: turbulatordude <davemucha@...> [mailto:davemucha@...]
>Sent: Thursday, February 13, 2003 8:36 PM
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] Re: QUESTION ABOUT SERIES OR PARALLEL ON STEPPER
>MOTORS - ref post 52721
>
>I can't recomend anything about the capacitors, but you are correct
>in that voltage it the key. if they worked at higher, you did verify
>they did work actually at those high voltage right ?
>
>regarding power, if you plan on the geckos, 80 volts is the max.
>divide by 1.414 to determine DC voltage bofore the caps. the caps
>will increase the DC to near peak values and not RMS so you pick up
>the 1.414 times raw DC.
>
>If you can cut the DC to 56 volts, you will be good. if you want a
>little more, you can put a terminal connection on 56 volts, then wrap
>a few turns and add another termianl. it would let you get closer to
>the 79.999 people shoot for. and it would allow you to correct for
>losses from the diodes/rectifier.
>
>Dave
>
>
>
>
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jeff Goldberg" <jeff@w...>
>wrote:
> > OK. Sounds like a reasonable thing to do.
> >
> > Back to one of my original questions:
> >
> > Since I can modify the power supply somewhat, and since the max
>drive
> > voltage is 80 volts, should I supply 62 volts, 68 volts (or some
>other
> > voltage which would mean I'd have to scrap the power supply and use
> > something else). Also, I've seen calculations on how to properly
>size a
> > capacitor for a DC power supply. There is a capacitor (unmarked of
>course)
> > about the size of a beer can with a 1K ohm resistor across it on
>the DC side
> > of the power supply. Can I assume that if it worked OK at 130
>volts DC, it
> > will be OK at about 1/2 the voltage?
> >
><snip>
>
>
>
>
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