Re: Power supply for Servos

Your 76V 13A supply should work just fine. You won't be able to
achieve the maximum RPM of the motor though. The motors will
probably only pull ~2-3A under moderate load if you have them geared
properly. Also, that's usually on one motor at a time. It will be
fine. Hook it up and try it and don't worry about it. I think
you'll be pleasantly suprised and never think about it again.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me" <cnc4me@g...>
wrote:

>
> These servo suppplys are a little hard to nail down. A couple of
> weeks ago i tried to get a formula for making one. Both Mariss and
> Jon Elson gave me advice for building a supply. If i understood
> them. The straight forward approach means you need the wattage
> rating of the servo. Second best is the constant current spec and
> maybe Ke constant. Third worst is the voltage and current rating

like

> you gave.
>
> Do you have any other specs on your motors...
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
> <dave_mucha@y...> wrote:
> >
> > Hi all,
> >
> > I am uncertain about sizing the power supply for servos.
> >
> > 2 servo motors, 110v, 11.6A
> >
> > If I use a 55V transformer of 1kva, that would be roughly 1,000
> > watts.
> >
> > Once converted to DC, (55-1.2=53.8) x 1.414 = 76 volts.
> > 1,000 watts at 76 volts = 13 amps.
> >
> > For steppers, we talk about using 60% of the rating for the power
> > supply, but I have not seen any references regarding servos.
> >
> > Would I use 76 volts and 11.6 amps as the rating for the servo ?

or

> > use 60%
> >
> > I hate to think that by the time I get everything comple I will
> > probably still not have all the answers….
> >
> > Amy I cose on this ?
> >
> > Dave