Re: what alim for my servos - capacitor

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "mataf01"
<patrick.damien@s...> wrote:

>
> Hi everybody,
> Here is my problem:
> I'm planning to by 3 DC brushed servo motors.
> They are rated 120 V 4 Amps continuous and 20Amps peek Im planning

to

> use them with Geko Drives. They will then work at 80V (max of Geko
> drives.
> What are your suggestions about the minimum requested power of the
> alim to power them 3 without problems?
> Thanks
> Patrick

Since you are using 50 hz power, the formula is

( 100,000 times amps ) / voltage

assuming you use a 48 volt transformer, you get 67 volts.

assuming you have a 750VA transformer at 48 volts, and assuming 750va
is 750 watts, then 750 / 67 = 11.2 amps.

so, 100,000 times 11.2 = 1,120,000
1,120,000 / 67 = 16,716uF

The capacitor should be rated for 100 volts or more.
using multiple capacitors is fine.

Using 20,000uF is fine.

more reading
http://www.geckodrive.com/ycom/documents/C163R16_power_supplies.pdf

But, I don't think he lists the 100,000 for 50Hz although it is
listed as 80,000 and assumed it is 60hZ.

Dave