Re: [CAD_CAM_EDM_DRO] Re: Power supply for Servos

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@...> 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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