Re: [CAD_CAM_EDM_DRO] servo voltage

Thanks for the input Jon. Hmmm, guess what motors I am going to run??? My
computer with most of my info on it is in transit. When I get it I will
contact you with my actual ps voltage and see what you think then.

Thanks,

Thomas Powell
http://imageevent.com/tppjr

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, December 20, 2003 11:31 AM
Subject: Re: [CAD_CAM_EDM_DRO] servo voltage


>
>
> Thomas Powell wrote:
>
> >I know a stepper can be run up to about 20 times the coil voltage. How
high
> >can I go safely for a servo motor. Say for a 40 volt motor.
> >



> So, there is no pat answer, it depends a LOT on the motor. For
> instance, the
> Ametek motors that so many people are using has over 4 Ohms of resistance.
> It has a peak current rating of 12 A, and a 36 V supply voltage rating.
> It should be clear that 4*12 > 36, therefore, the motor cannot even REACH
> its peak current rating from a 36 V supply! That is when sitting still!
> When
> running at 900 RPM, you can't get ANY current through it, as the Kv*900RPM
> = about 36 V, leaving no margin for IR drop. So, to get rated
> performance, you
> HAVE to run it above the manufacturer's rating! But, then, that is a
rather
> poor motor for machine tool motion applications. I throw it out there as
an
> indication of how all these parameters interact.
>
> Jon
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Yahoo! Groups Links
>
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/
>
> To unsubscribe from this group, send an email to:
> CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>
> Your use of Yahoo! Groups is subject to:
> http://docs.yahoo.com/info/terms/
>
>