Re: Power supply for Servos

>I'm building another control and I'm going to use a 1000va at 62

volts. The DC will be >88 volts and the Geckos should handle it.
Marris said they actually come apart at 118 >volts and 30 amps

>
> Ron

Stop the presses. Be careful there. Yes Mariss did say the drives
will come apart at 118 volts. But he didn't mean they could run
there. Fact is, most of the high voltage components in gecko drives
are rated for 100Vdc. The caps, and fets are 100Vdc parts.

Wally





--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

> Dave, To give you a rough idea on servo power supplies. I'm using a

800vA at 46 volts and around 16 amps for 3-13 amp continuous servos.
64 volts DC after being rectified. I get rapids on X and Y of 120
ipm. Would go faster with higher voltage. Current mostly affects
acceleration which with the supply I'm using is more than adequate. A
750 -1.5 Kva power supply would be adequate for your motors. I'm
building another control and I'm going to use a 1000va at 62 volts.
The DC will be 88 volts and the Geckos should handle it. Marris said
they actually come apart at 118 volts and 30 amps

>
> Ron
>
> turbulatordude <dave_mucha@y...> wrote:
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me"
> 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...
>
>
> PACIFIC SCIENTIFIC, Permanent magnet DC motor.
> 1 1/2 hp
> 110 VDC
> 11.6 Amps
> 3,200 RPM
> Continous Duty
>
>
> If I look at the wattage of the servo, 110VDC @ 11.6 amps, that is
> 1,276 watts.
>
> But, if I look at it with the max voltage from my power supply, it

is

> 76 volts time 11.6 amps = 881 watts.
>
> For 881, I could use 2 transformers to get 2,000 watts, that is

light

> for one calculation, and heavy for the other.
>
> I had thought there was some number one could use for duty cycle as
> the motors are not driven DC, but pulsed.....
>
> I'll go back and re-read Jon's post. IIRC, it was more guidelinesh
> than calculations.
>
> Dave
>
>
>
>
>
>
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