Re: 3 phase car alternators

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "BRIAN FOLEY" <ka1bbg@xxxxxxxxxxx>

yes you are correct, rotating field driven thru 2 slip rings and brushes,
still called rotor and the output is call stator on a generator armeture and
field is the correct words. cul brian f.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, October 17, 2006 4:43 PM
Subject: RE: 3 phase car alternators


> Original poster: "Leigh Copp" <Leigh.Copp@xxxxxxxxxxx>
>
> Jim,
>
> As I understand things, an automotive alternator (like the 990 MW units
> at nearby Darlington Nuclear) does not have a rotor per se, but a
> rotating
> -field- winding, that is excited with DC through slip rings (as opposed
> to brushes and a commutator). The magnitude of the DC current through
> the field determines the magnitude and angle of the AC voltage that is
> generated.
>
> Are you thinking of a generator, which has a commutator (and is
> basically a DC machine)?
>
> The alternator can be rewound to change the output frequency vs. machine
> speed characteristic (or "k"). There are some efficiency tradeoffs as
> well however.
>
> Leigh
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: October 17, 2006 2:38 PM
> To: tesla@xxxxxxxxxx
> Subject: RE: 3 phase car alternators
>
> Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
>
> At 07:09 AM 10/17/2006, you wrote:
>  >Original poster: "Terry Oxandale" <Toxandale@xxxxxxx>
>  >
>  >Could the poles be rewired into fewer parallel circuits (and thereby
>  >decreasing the number of poles) increasing the current output and
>  >decreasing the frequency. I've never looked into an alternator, and
>  >would guess this is a major undertaking.
>
> The bigger problem would be the rotor, which has a fixed number of
> poles.
>
> I think you're right.. major undertaking.
>
>
>
>
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