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Old 10-12-2019, 06:36 PM   #7441 (permalink)
oil pan 4
EV convert
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Location: NewMexico (USA)
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Originally Posted by sendler View Post
Are the advantages of almost no moving parts worth it for ease of maintenance and longevity? Especially since the most modern application has shifted to non-synchronous DC transmission.
From what I have seen a 3mw gearless uses more copper and rare earth's (normal geared turbines don't use any rare earths) than what a 10mw geared turbine uses.
The problem is a 500' or bigger blade diameter is the blades are only going to turn about 9 rpm or less. To get enough relative motion out of 7 to 10 rpm to make a lot of use able power your armature and exciter are going to have to be freaking huge, like the size of a small school bus.
GE already makes variable speed alternator wind turbines that take variable frequency AC, turn it to DC then invert it to 60hz AC for local high voltage transmission.
Plus all mechanical power generation starts as AC.
So turning it into DC is the extra step.

1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.