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| Ev Archive for October 1998 |
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| 1332 messages, last added Wed Aug 08 18:43:21 2001 |
[Date Index][Thread Index]
Re: car alternators as motors
On Sat, 31 Oct 1998, Robert McDonald wrote:
>
> Can someone please explain to me why cars use alternators instead of just plain DC
> generators?? Is it to do with the variable speed that they have to run at??
> (wild guess)
>
> Rob.
>
AFAIK, alternators have a higher power to weight ratio than DC machines,
and can run at much higher speeds, with little maintenance (very robust
- no brushes). Combo of light weight+maintenance free. Of course, a
rectifier set would be used to charge the battery, but that is also more
robust than brushes. (This is from theory - recent advances in DC
machines I'm unaware of - anybody to correct me on that?)
Subramanian
p.s. DC machine == AC machine + brushes
========================
R SUBRAMANIAN
M. TECH (ENERGY SYSTEMS)
H-1, ROOM NO. 27
http://www.me.iitb.ernet.in/~subram
========================
He fights...with passion - "Braveheart"
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