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Easy Auto Alternator Conversion | 28 comments (28 topical, 0 editorial)
Re: Easy Auto Alternator Conversion (3.00 / 0) (#19)
by stephent on Wed Jul 4th, 2007 at 10:13:52 AM MST
(User Info)

as long as ya caught it willib... :-)


Re: Easy Auto Alternator Conversion (3.00 / 0) (#21)
by willib (willibur at comcast dot net) on Wed Jul 4th, 2007 at 01:11:08 PM MST
(User Info) http://www.njwind.com/webcam.html#

Yeah , been thinking again, ( i know look out ),why they still use such an inefficient alternator in a car...
it would increase the overall milage if they would just improve the alternator
if they used neos ,in a dc motor type setup , they could still regulate the output i think ?

Carpe Ventum (seize the wind)
[ Parent ]


Re: Easy Auto Alternator Conversion (3.00 / 0) (#22)
by Ungrounded Lightning Rod on Wed Jul 4th, 2007 at 05:38:27 PM MST
(User Info)

40 watts is 5 1/3 HUNDREDTHS of a horsepower.  When idling the engine can easily spare it.  At speed the excitation requirements drop drastically.  It's easier to control that 40 watts to regulate the output than it is to regulate the wild AC you'd get with permanent magnets.  Meanwhile, cost and weight are the big factors for automotive design.  (Saving a dime per car at a major auto company is enough to hire two engineers full-time to figure out how to do it.)

Alternators are actually very efficient - especially compared to the generators that preceeded them.  It's just that they're optimized for being bolted onto a hundred-plus horsepower internal combustion engine, where a horse or two here and there is in the noise - not for a windmill, where 40 watts would be precious when the wind is low.

[ Parent ]



Easy Auto Alternator Conversion | 28 comments (28 topical, 0 editorial)

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