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Building a "Mount" for the Onan Power Plant


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  #141  
Old 11-13-2017, 08:20:15 AM
Leon N. Leon N. is offline
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Default Re: Building a "mount" for the Onan Power Plant

LenK please re read my post 84 where I quote Onan as saying the toroids are permanently magnetized. I am not kidding, this is directly from one of their documents which explains how the exciter works. You need a copy if interested.
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  #142  
Old 11-13-2017, 09:08:17 AM
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Jim McIntyre Jim McIntyre is offline
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Default Re: Building a "Mount" for the Onan Power Plant

Which Onan document and page number are you referring to, Leon?
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  #143  
Old 11-13-2017, 10:57:22 AM
Leon N. Leon N. is offline
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Default Re: Building a "Mount" for the Onan Power Plant

Jim I am referring to a 1960's ish Onan 22 page marketing document entitled OAN J-LINE ENGINE-GENERATOR SETS Gasoline*Diesel*Gas.

I think a B&W copy was put up on the Stak somewhere. This is the document in full Onan Green colors with overlays describing the features of the engines and especially the magneciter back end.

I have in the past made several full color copies for various Stak members. I am sure they know what I am talking about. I have a B & W copy on my PC but because of the foldout pages, and the overlap it is not as nice as the color copies I have made at the repro center because they can repro the larger pages on a single sheet.

I still am willing to bet his problem could be that reverse battery polarity somehow screwed up the magnetization of those cores..
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  #144  
Old 11-13-2017, 12:11:38 PM
Leon N. Leon N. is offline
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Default Re: Building a "Mount" for the Onan Power Plant

JoeE your questions in post 138 need answers and I am not about to tell you how to go about answering them other than to say, if you get a copy of the Onan document that explains how the magneciter works it may help you understand how this specific design works.

After studying it again, I think there is merit in my suggestion to pass a small polarizing dc current through the cores, using the polarity dots as + to re aligning the stored magnetic fields.

I am not sure how much dc current is necessary. But I would limit it by using a separate dc power supply and an external current limiting resistor, taking into consideration the resistance of the winding you are trying to re-polarize. One would think just a brief burst might do it. But limit the path to just the specific winding and not other circuits. Do that for all three toroids.

This is just my suggestion if all else checks out. Just my suggestion. Proceed at your own risk.

I cannot find any Onan discussion about this other than in the document I am referring too. Good Luck.
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  #145  
Old 11-13-2017, 02:36:26 PM
len k len k is offline
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Default Re: Building a "Mount" for the Onan Power Plant

Leon .....many page thread. Could you post a manual number that would be good to read so I can get a better overview of Onan magnaciter operation, for his spec.
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  #146  
Old 11-13-2017, 03:05:56 PM
Leon N. Leon N. is offline
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Default Re: Building a "Mount" for the Onan Power Plant

Link it is not a manual. It has no number. It is a one of a kind J line promotional document. You will never see this kind of detai in a product description document today. All I can do is either email a B & W cut up copy which unfortunately clip some information or go to the expense of having a full repro copy professionally made once again.
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  #147  
Old 11-13-2017, 03:26:24 PM
len k len k is offline
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Default Re: Building a "Mount" for the Onan Power Plant

Email is fine for that info.

But I assume there is a separate general manual somewhere that discusses magnaciter operation. If you had that manual number it would be helpfull, as I think you know more about various magnaciters than I do.
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  #148  
Old 11-13-2017, 04:09:21 PM
Leon N. Leon N. is offline
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Default Re: Building a "Mount" for the Onan Power Plant

LenK provide me your email address me i will send you a black and white copy which has some words cut off but you still can see most of it.
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  #149  
Old 11-13-2017, 05:14:37 PM
Leon N. Leon N. is offline
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Default Re: Building a "Mount" for the Onan Power Plant

OK, being no expert at the PC, however, I am attaching the best I can do in scanning the appropriate pages from this document. The attached does not do justice to the original which I normally have professionally done.

The attached describes, if you can read it, how the magneciter works.
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  #150  
Old 11-14-2017, 03:18:39 PM
len k len k is offline
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Default Re: Building a "Mount" for the Onan Power Plant

I magnified it further by copying it into MS publisher and using it's magnification to help read it. Other software like MS paint likely can do same.

Just figured out foxfire browser has a zoom command under "view"menu that does the same thing, easier..... ( control +)
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  #151  
Old 11-14-2017, 05:13:43 PM
Leon N. Leon N. is offline
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Default Re: Building a "Mount" for the Onan Power Plant

In my post 149 I neglected to include the very first page of the section describing the magneciter because it reproduced cleanly in the B & W copy. So find the first page attached.

If anyone who is somewhat familiar with electrical circuits wants a free less than superior B & W copy of this Onan JB marketing brochure from the 60's just provide me your email address and I will also include as a second attachment those three pages shown in post 149 that were cut off when I made a home made copy of the document. Seriously, it explains in simple easy to understand terms how the Magneciter works as well as showing the internal features of the JB engine design.

My JB continues to perform as specified now coming up on 48 years. They do not build them like that anymore. I tell you all the best thing I did to prolong the use of my JB was simply to run it on natural gas, the oil discipline and locate it in a dry environment.
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Last edited by Leon N.; 11-15-2017 at 10:25:51 AM. Reason: More info
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  #152  
Old 11-17-2017, 05:17:41 PM
len k len k is offline
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Default Re: Building a "Mount" for the Onan Power Plant

Interesting side story of another use for saturable reactors: They were used to switch 15kz "RF" carrier for morse code communications across Atlantic ocean in pre-vacuum tube days.
Post 8-9 and 14 of https://www.smokstak.com/forum/showthread.php?t=173422
.

Last edited by len k; 11-17-2017 at 06:01:41 PM.
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