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12-09-2009, 10:01 PM
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Junior Member
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Join Date: Dec 2009
Posts: 3
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Re: New to here... speculations..
i guess i should have specified i was inquiring more info on what they do when they rewind the stator and why they go to a permanant mag setup
More thoughs are seems like it would be easier to use an old generator vrs an alternator but correct me if im wrong
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12-09-2009, 10:48 PM
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Senior Member
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Join Date: Jul 2009
Location: near Dallas, TX
Posts: 233
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Re: New to here... speculations..
Okay, all automotive alternators are alternating current generators. We just rectify their output to DC, so we can use them to keep our DC batteries charged. Or were you saying that you think that using direct current generators would be more efficient? If so, I'm about 90% sure that AC generation is slightly more efficient than DC generation, but as you'll see below, it really makes no difference which is more efficient.
Of course, that isn't the reason that all automobiles now come with alternators. They come with alternators because it's considerably cheaper to build AC generators than DC generators, and the AC generators last a heckuva lot longer. See, DC generators require a commutator, which didn't last very many miles. The AC that is generated is also higher voltage than the ~14V DC output, allowing lower amperage passing through the brushes, making them last longer.
As far as why all of the small wind companies that use automotive alternators convert them into permanent magnet alternators, that's simple. It's not hard to do, and a PMA doesn't require being excited, so there is no battery draw when the turbine is producing no power. As an added benefit, PMA's require no brushes that would eventually wear out. It's a win/win for them.
__________________
On this site, 99.999% of all underlined words are links.
A watt saved is better than a watt generated, since it always costs less than 10% as much, and can cost as little as 1%.
V=volt, A=ampere, Ah=ampere hour, Wh= watt hour, VOC=open circuit voltage, ISC=short circuit current, VMPP=voltage @ max power, IMPP=current @ max power, BTW=by the way, your=belongs to you, you're=you are, too=in addition to, two=1+1, to=towards
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01-05-2010, 06:32 PM
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Junior Member
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Join Date: Jan 2010
Posts: 2
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Re: PMA questions
A Google search on "RPM independent grid tie induction generator" yields interesting result.
Link removed by myocardia.
Last edited by myocardia; 01-05-2010 at 08:03 PM.
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01-05-2010, 08:14 PM
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Senior Member
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Join Date: Jul 2009
Location: near Dallas, TX
Posts: 233
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Re: PMA questions
Yes, you're right, that's a very strange thing to be googling. Since I highly suspect your link was nothing more than a money-making attempt for you/your site (Google pays for searches, as do some companies), I have removed your link. For anyone wanting to do a Google search on "RPM independent grid tie induction generator", click here for one that is credited to this site.
__________________
On this site, 99.999% of all underlined words are links.
A watt saved is better than a watt generated, since it always costs less than 10% as much, and can cost as little as 1%.
V=volt, A=ampere, Ah=ampere hour, Wh= watt hour, VOC=open circuit voltage, ISC=short circuit current, VMPP=voltage @ max power, IMPP=current @ max power, BTW=by the way, your=belongs to you, you're=you are, too=in addition to, two=1+1, to=towards
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01-05-2010, 08:37 PM
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Junior Member
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Join Date: Jan 2010
Posts: 2
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Re: PMA questions
Quote:
Originally Posted by myocardia
Yes, you're right, that's a very strange thing to be googling. Since I highly suspect your link was nothing more than a money-making attempt for you/your site (Google pays for searches, as do some companies), I have removed your link. For anyone wanting to do a Google search on "RPM independent grid tie induction generator", click here for one that is credited to this site. |
Thanks!
Your link is even better, more widely view.
I am wonder how can one make money by just post a search phase.
Anyway Thanks again.
CM
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01-05-2010, 09:28 PM
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Senior Member
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Join Date: Jul 2009
Location: near Dallas, TX
Posts: 233
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Re: PMA questions
Well, you have to own a website to be able to profit from the searches. If I was wrong about your intentions, then I apologize. By the way, welcome to Nature2Energy.
edit: The reason that I assumed what I did was that one of the top "hits" on your link was you saying the identical thing on another forum today (a site called topix(dot)com), with the same link. Funnily enough, that forum doesn't show up on the search from this site using the same terms.
__________________
On this site, 99.999% of all underlined words are links.
A watt saved is better than a watt generated, since it always costs less than 10% as much, and can cost as little as 1%.
V=volt, A=ampere, Ah=ampere hour, Wh= watt hour, VOC=open circuit voltage, ISC=short circuit current, VMPP=voltage @ max power, IMPP=current @ max power, BTW=by the way, your=belongs to you, you're=you are, too=in addition to, two=1+1, to=towards
Last edited by myocardia; 01-05-2010 at 10:09 PM.
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05-07-2010, 10:37 AM
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Junior Member
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Join Date: May 2010
Posts: 6
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Re: PMA questions
Quote:
Originally Posted by CypresMan
A Google search on "RPM independent grid tie induction generator" yields interesting result.
Link removed by myocardia.
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Yes result was really useful and have good information
__________________
Russell
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