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ceengland7(at)gmail.com
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 Posted: Sun May 05, 2019 8:01 pm Post subject: alternator field current |
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There have been a few discussions here about alternators tripping their
5A field breaker, but consensus has been that properly operating field
windings don't draw more than 5A. Just stumbled upon an interesting data
point that's 'new to me'.
Apparently, there may be some older models that do. Someone on another
forum asked about how to hook up a Transpo V1200 adjustable regulator.
Turns out, there's an old thread here on AEC about it.
http://www.matronics.com/forums/viewtopic.php?t=46713&sid=9b0b3a2dcfc6958ef0d291d283abd4b9
Here's a data sheet:
http://estore.waiglobal.com/productdatasheets/PD0570_0.pdf
Since it's adjustable, I thought it might be an inexpensive option for
primary and backup alternator duty. According the data sheet, field
current is '10A typical; 20A max'.
I went trolling ebay looking for a deal on it, and stumbled upon this:
https://www.ebay.com/itm/PREMIUM-ADJUSTABLE-EXTERNAL-VOLTAGE-REGULATOR-CHRYSLER-DODGE-PLYMOUTH-1970-87/143191553879?hash=item2156e1b757:g:jpAAAOSwfRZcnWcx
a completely different model that is 'for 7A rotors'.
So apparently, there are some alternators out there in the wild that
could indeed draw more than 5A field current.
No immediate reason for posting this; just found it interesting. (Of
course, I might be the last guy to discover it....)
Charlie
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nuckollsr
Joined: 24 Mar 2009
Posts: 95
Location: Medicine Lodge, KS
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| Posted: Fri May 10, 2019 8:44 am Post subject: Re: alternator field current |
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Interesting . . . I've seen some 'heavy duty' regulators in other venues as well. But I'm at a loss to recall any that even begin to draw that much field current. A prudent designer of generators and alternators will strive to minimize the necessary field current.
While field current goes to creating a controllable magnetic flux for the purposes of mechanical-to-electrical energy conversion, the strength of the field is proportional to turns of field coil wire multiplied by current in those wires.
It's theoretically possible to generate any desired field flux intensity at any practical current level. The largest alternators I've worked with needed no more than 3 or so amps in either 14 or 28v systems. Field current is 100% wasted energy. 3A at 28V dumps 84 watts of heat directly into the core of the machine.
No doubt someone found value in crafting 'heavy duty' devices CAPABLE of driving a low resistance alternator field . . . but I think one would be hard pressed to find such a machine.
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