Jon: I could be wrong, but I think you're confusing transformer output with stepper input here...:)
If I am correct, the current rating in a transformer has mostly to do with the gauge wire used, and if half the winding can take 10A, so can the full winding. I can't find the catalog page that he is referring to(or at least the part about the "cap"), but it sounds to me like they are telling you how to determine what capacitance or inductance to use for filtering of the power supply that you build with this transformer, based on the output current required. Andy Wander Verrex Corporation -----Original Message----- From: Jon Elson [mailto:[EMAIL PROTECTED] Sent: Sunday, October 24, 2004 12:26 PM To: [EMAIL PROTECTED] Subject: Re: [CAD_CAM_EDM_DRO] current rating of transformers turbulatordude wrote: >Hi, > >If I have a 24 volt, (12V-0-12) center tap transformer like the MPJA >unit. >http://www.mpja.com/productview.asp?product=7846+TR > >And isolate the center tap I get 24 volts. > >But when rectified, doesn't the current change also ? > >There is a note in the catalogue that for this wiring the amps are >1.8x > >The catalogue refers to required ouput amps > > >full wave bridge cap input filter 1.8x to required output amps >full wave choke input filter = required output amps >full wave, center tap, cap = 1.2x roa >full wave, center tap, choke = 0.7x roa > > Using the full winding means current flows in both ends of the winding all the time. So, the current rating must go down. With full-wave center tap, each half of the winding gets a rest 50% of the time, so current rating goes up. I guess what they are saying here is that you take the load current and multiply by these factors to get the rating of the transformer. Jon Addresses: FAQ: http://www.ktmarketing.com/faq.html FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/ Post Messages: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] List owner: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] Moderator: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] [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 Addresses: FAQ: http://www.ktmarketing.com/faq.html FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/ Post Messages: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] List owner: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] Moderator: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] [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: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
