Re: a power supply question

Hi,
The rating of 65VDC (for the mentioned motor) is apparently a
MAXimum rating of the motor, not the running voltage. These are
1.75A/phase (2.12 ohm, 9.2mH series wound, and 3.5A, .53 ohm, 2.3 mH
parallel wound) motors that work well at 24VDC. Infact with the de-
rating that Mariss suggested, running these in parallel is acceptable
because: 1.75A * 2= 3.5A. De-rating by half (back down to 1.75A) is
well under the maximum of the Xylotex 2.5A/phase rating, thus the
high inductance/resistance of series wound is removed, and
microstepping is still quite possible.

As for power supplies I still like the $4.95 price tag of:
http://www.mpja.com/product.asp?product=13299+PS
which is a 6 amp supply at 24VDC. Some people don't like switching
supplies like these, but I don't have propblems with them. You can
put a nice big cap accross the supply if want.

I have some of these motors, and ran them in both series and parallel
mode. I got good results with series mode, but much better result
running them in parallel mode (at 24VDC)

Jeff
xylotex @ hotmail.com
(remove the spaces around the @)
http://www.xylotex.com

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Ron Kline <godsone@e...>
wrote:

> Dumb question here but how are you going to run a 65V motor with a

35V

> supply .
> Not much power !!
>
> Ron K
>
> lum_l wrote:
>
> >Hi All,
> >
> >I am sorry if this question has been asked before.
> >
> >I have purchased some steppers from Ebay, they are the
> >powermax II , max 65 volt, 1.75 amp.
> >(http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=12577
> >&item=3106027187) I also plan to use the xylotex driver board (3
> >axis).
> >
> >My question is, what voltage and how many amp will require to
> >drive these motors.
> >
> >The xylotex max voltage is 35 volts so I think I will need a

supply

> >that will give me 30 volts @ 6 amps. Am I correct ? If not can
> >someone give the correct values. And does any one have a
> >source for surplus supplies?
> >
> >Thanks for your help,
> >
> >Les
> >
> >
> >
> >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@a...
> >Moderator: jmelson@a... timg@k... [Moderator]
> >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
> >
> >
> >
> >Your use of Yahoo! Groups is subject to

http://docs.yahoo.com/info/terms/

> >
> >
> >
> >
> >
>
>
>
> [Non-text portions of this message have been removed]