Re: [CAD_CAM_EDM_DRO] Re: G201s and BIG step motors

Mariss,
It is not that I am trying to get more power from the
motors, the problem I keep running up against is that the
machines that I am working on have power supplies that are
in the 100 to 170 volt range. That means a major
modification to or replacement of the power supplies.
Darrell

----- Original Message -----
From: "Mariss Freimanis" <geckohall@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Tuesday, September 19, 2000 9:59 PM
Subject: [CAD_CAM_EDM_DRO] Re: G201s and BIG step motors


> -------------------------- eGroups
Sponsor -------------------------~-~>
> eLerts
> It's Easy. It's Fun. Best of All, it's Free!
> http://click.egroups.com/1/9068/4/_/423600/_/969425998/
> ----------------------------------------------------------
-----------_->
>
> 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
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list
for the discussion of shop built systems, for CAD, CAM, EDM,
and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com,
wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page:
http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>
>