Re: G201s and BIG step motors

Darrell,

Good evening! Actually things are not as grim as it may seem. My
whole point was you will not get the power from a size 42 motor from
a 7A, 80VDC class drive. A size 42 motor is capable of 1Hp of power,
this class drive will get 1/4 HP from it. Power is speed times
torque. If low speed torque is what you need then this class drive
will certainly deliver it.

If you are retrofitting for this motor and if its existing power
supply voltage falls below 80VDC, then this drive will deliver better
performance than what was on the machine before. You will get all of
the low speed torque the motor is capable of.

What I am trying to differentiate is power from torque. 1HP will
deliver 200 oz/in of torque while moving at 1,000 inches per
minute. That is 396 lbs of thrust at 1,000 inches per minute. Is this
a practical speed for that amount of push? How hard would it be on
your lead screw and machine if it were moving at that load?

This is what 1HP can do. A size 42 motor will deliver 1,000 to 2,000
oz/in of torque at low speed. A 7A, 80VDC will deliver 200 oz/in
torque up to a speed of 250 IPM, less at higher speeds. Practically
speaking is that enough?

All I was saying is you will not get full POWER from a size 42 motor
with this class drive. But if you did, would you want it?

Regards to servodrives. The G320 will easily deliver 1 to 1-1/2 HP as
is. Taking into account the the above, wanting more would mean you
have a very large machine indeed.

Mariss

--- In CAD_CAM_EDM_DRO@egroups.com, "Darrell" <dgehlsen@e...> wrote:

> Is there any chance that there would be
> a version that will handle 42 frame
> steppers?
> Also, how about large servos in the
> range of 25 Amps continuous?
> Darrell