The real benefit to the brake drum (disk) windmill is just that it costs 
perhaps $150 to build, more or less ..
The core of the alternator you show surely costs at least $300 (+/-50%)
The brake drum alternator is also "optimized" to output substantial 
current at 500 RPM or less. You need a lot of magnetic force to do this. 
There hasn't been anything new done to motors in 100 years, yes I'm 
trolling, but honestly the only new thing is nicer materials and 
different methods of commutation.
-
Martin


Apptech wrote:
>
> This alternator
>
>         http://others.servebeer.com/misc/alternator.jpg
>
>   

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