Re: [CAD_CAM_EDM_DRO] transformer selection

Hello Tim

The problem with your transf. is that the sec. volts of 120
will result in a dc of ~ 1.4 times higher i.e. 165 V. You therefore need to
reduce the volts which is easier said than done. One way is to wind counter
turns around the core in series with the 110 V winding , that is if you can
get at the core. For a transformer of that size you will need about
1 turn per volt or two, 20 to 40 counter turns. Make sure the wire is about
the same area as the original although it
can be stranded with plastic insulation, easier to wind.

kib

However a 1.5 KVA transformer would do the job just as well.

----- Original Message -----
From: "Tim" <sspeed@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, March 22, 2004 4:04 AM
Subject: [CAD_CAM_EDM_DRO] transformer selection


> I have 4 DC servo motors that I need to build a power supply
> 120 volts up to 10 amps each
>
> I have found a 220 volt pri to 120 sec volt transformer 25amp
> 3kva rated
>
> Is this over kill? or is it too small?
>
> Thanks for any advice........
>
> Tim
>
>
>
> 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
>
>
>
>
>