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alternator field breaker switch

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Erich_Weaver(at)URSCorp.c
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Posted: Tue May 23, 2006 2:40 pm Post subject: alternator field breaker switch

Thanks for the interesting lesson on alternator  fundamentals Brian.  But

now you have me curious.  Just what does my little 8 or nine amp PM

alternator (dynamo?) that I use as a backup do with the unused amperage

that its constanly generating?



Erich Weaver

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Gilles.Thesee(at)ac-greno
Guest

Posted: Tue May 23, 2006 2:46 pm Post subject: alternator field breaker switch

 	  Quote: 	
		    Just what does my little 8 or nine amp PM

 alternator (dynamo?) that I use as a backup do with the unused amperage

 that its constanly generating?

   

Erich,
	




I'd say it is constantly generating VOLTAGE. No amperage if the circuit 

is open.



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Tue May 23, 2006 7:16 pm Post subject: alternator field breaker switch

On May 23, 2006, at 3:32 PM, Erich_Weaver(at)URSCorp.com wrote:



 	  Quote: 	
		   

 Thanks for the interesting lesson on alternator  fundamentals  

 Brian.  But

 now you have me curious.  Just what does my little 8 or nine amp PM

 alternator (dynamo?) that I use as a backup do with the unused  

 amperage

 that its constanly generating?


	


Well, it doesn't generate any amps if there is no load but it does  

generate voltage.



I haven't looked at how B&C regulates its dynamo but I have seen both  

shunt and series regulators used with dynamos. A shunt regulator  

draws current from the dynamo until its output drops to what you  

want. The regulator just burns up the excess as heat. In the case of  

a series regulator a pass transistor functions as a variable resistor  

to drop the voltage to the desired value.



Nowadays they are probably using switch-mode regulators which are  

much more efficient.



Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

 Antoine de Saint-Exupry

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_________________
Brian Lloyd
brian-yak at lloyd dot com
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I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

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