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New Volt should get 230 mpg in city, GM says - Page 25

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Posted by News on August 31, 2009, 3:22 am

Problem is that you are thinking an alternator has to be
running at high rev.

I am not and never said that.  If need be it is more flexible and smooth and
not agricultural.

Posted by harry on August 31, 2009, 8:28 pm

More poles won't help.  It needs more ampere turns/stronger magnetic
flux.  That is, a higher field current or more turns of wire. Or a
stronger permanent magnet if that's what it has.
They are a bigger diameter because if it has more amps,  it has
thicker wire. If it has more turns it has thicker and longer wire.
More poles just increases the frequency.

Posted by daestrom on August 31, 2009, 10:58 pm

harry wrote:

Bigger diameter also helps with developed voltage.  The higher relative
speed between windings and pole faces increases voltage for a given
field strength and RPM.

Of course larger diameter increases the centrifugal forces that have to
be retained as well.


Posted by harry on August 17, 2009, 7:07 pm

Only when cold.

Posted by clare on August 17, 2009, 3:24 am

On Sun, 16 Aug 2009 11:29:17 -0700 (PDT), harry

Owned by the Germans now, isn't it? Opel is German and basically
owns/controls Vauxhaull.

I've owned BMC and Vauxhaull cars , with Vauxhaull being the better of
the two.
I've also owned Ford (america) Ford (germany) Fiat, Totota, GM
(america) Chrysler (America and British(rootes/sunbeam)) Fiat, VW,
Renault, and peugot as well as AMC and Hudson.
Not sure which would class as the worst - but the '95 GM (pontiac) was
definitely in the running.
My 88 Chrysler was up there pretty good for the best - we drove it
until it was 18 years old, and sold it in good running condition.

My BMC mini i described as the "most dependable car I ever owned". You
could depend on it to malfunction ust about any time you needed it. My
first car - and a lot of fun - but dependability was not it's long
suite. To give credit where credit is due, it DID have 214,000 miles
on it when I got rid of it - -  - - - - -.

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