Posted by Drew Cutter on October 18, 2007, 9:55 am
Question : what percentage of small wind turbine operate off of
Permanent Magnet DC Generators ? I like the ideal of gryphon not having
parts in the turbine that requires maintence. Any other mfg. run off a
magnet ?
Posted by Anthony Matonak on October 18, 2007, 11:34 am
Drew Cutter wrote:
> Question : what percentage of small wind turbine operate off of
> Permanent Magnet DC Generators ? I like the ideal of gryphon not having
> parts in the turbine that requires maintence. Any other mfg. run off a
> magnet ?
I'm no expert in the field and haven't done a survey but to the
best of my knowledge all of the small wind turbines use permanent
magnet alternators rectified to DC. Anything else is less efficient.
Anthony
Posted by Ulysses on October 18, 2007, 12:48 pm
> Drew Cutter wrote:
> > Question : what percentage of small wind turbine operate off of
> > Permanent Magnet DC Generators ? I like the ideal of gryphon not having
> > parts in the turbine that requires maintence. Any other mfg. run off a
> > magnet ?
> I'm no expert in the field and haven't done a survey but to the
> best of my knowledge all of the small wind turbines use permanent
> magnet alternators rectified to DC. Anything else is less efficient.
> Anthony
That's my understanding too.
Posted by Drew Cutter on October 18, 2007, 3:54 pm
As a person just starting out his research. Why is magnet so much
better ? Do you get a choice in the quality of the magnet ? I keep
reading how brittle the high end magnet can be. Any problem with
replacing the magnet if you are in another country , south America.
Planning on installing a wind mill for a friend who lives in Ecuador
(remote).
Ulysses wrote:
>> Drew Cutter wrote:
>>> Question : what percentage of small wind turbine operate off of
>>> Permanent Magnet DC Generators ? I like the ideal of gryphon not having
>>> parts in the turbine that requires maintence. Any other mfg. run off a
>>> magnet ?
>> I'm no expert in the field and haven't done a survey but to the
>> best of my knowledge all of the small wind turbines use permanent
>> magnet alternators rectified to DC. Anything else is less efficient.
>>
>> Anthony
>
> That's my understanding too.
>
>
Posted by Overkill on October 18, 2007, 4:27 pm
Most magnets used in PMAs (permanent magnet alternators) are Neodymium
(Rare Earth) magnets. Any other magnet just doesn't have the power
behind it. PMA output has to be externally regulated.
The other type of alternator uses an electro-magnetic rotor (core) in
the alternator. Your car alternator works like this, it is less
efficient due to powering the core, but the output can be regulated
much easier - simply by shutting down the core.
Neodymuims are chosen because they are the strongest non-electro
magnets around and are very small for their magnetic power.
Im sure I read somewhere that Neodymiums take a few hundred years
before you start to notice a drop in their magnetic power, unlike
typical magnets you find that loose 2-3% per year.
In the field, PMA's using Neodymium magnets (you most probably wont
find any other type), you should never have to worry about replacing
them in your lifetime.
However more inportantly would be the bearings that allow the tubine
to spin. As it is spinning at reasonably high RPMs for most of its
life, bearings will be destryed quickly. Possibly needing replacing
every 5 years or so.. Then again, I don't own one so I don't know the
life of the bearings..
Would anyone else like to comment on the life of the bearings in a
wind turbine?
I hope this helps!
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> Permanent Magnet DC Generators ? I like the ideal of gryphon not having
> parts in the turbine that requires maintence. Any other mfg. run off a
> magnet ?