Re: Bridgeport servo motors

My example was really geared towards steppers and then someone said
use 50% safty for servos so i put that in. Lets hold off on this for
now...I am going to see if mariss at gecko will give us some advice.
No reason for me to guess when a expert is so close...

Wally




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
<polaraligned@o...> wrote:

>
>
>
>
> > Second, your 800 VA transformer is woefully inadequate. It is so

far

> > undersized you could not even run 1 motor on it up to power. A

week

> > or 2 ago I posted a complete example of how to design a power
> > supply. Search for this.
>
>
> OK Wally, so based on my motor specs, what should I figure the max
> current I need available to be? In your post on power supply design
> you assume your motors need 7 amps each.
>
> Here are the motor specs again:
>
> Torque constant: 44oz-in/amp
> Voltage constant: 32.5v/1000 rmp
> Peak torque: 600 oz-in, or 37.5 in-lb
> Nominal voltage: 40vdc
> Maximum voltage: 60vdc
> Demagnitization current: >20amps
> Terminal resistance 2.60 ohm
> Max rpm at 50vdc is about 1200 rpm
> No-load current <.51 amp
> armature inertia .09oz-in-sec^2
>
> I don't think 20amps x3 motors (60 amps!!!) would be the right
> answer. Then again, I=60v/2.6 ohms = 23 amps!!, not taking
> any emf into account. What should I figure these motors need
> to make them happy? A 60 amp power supply would be a monster.
>
> Thanks,
> Scott