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Forum Index : Windmills : Star / Delta controller
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
I will be very interested in the results David. It should work, as when the current limit of star hits, increasing the rpm will still try to stimulate higher EMF in the coils, and when this gets high enough, it will revert to delta. Car alternators have the same current limiting qualities as the F&P... which is a good thing else we would shred our belts every time we started the car, as there would be no limit when we revved it up past cut in... ie if we were running 50 amps @ 2000rpm, it would be horrendous at 7000rpm if it did not have enough synchronous impedance to limit the current too the design point.... belts would shred, or shafts would bend. look forward to it anyway. ...........oztules Village idiot...or... just another hack out of his depth |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
That stepped over the line Dave. Dont do it again. To everyone who is contributing to these F&P pissing contests. Get over it and be nice to each other, please. Glenn. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
For those with axial flux units, the lack of iron in the system will make it very hard for the synchronous impedance to stop the current rising.... to well past destructive temperatures.... this would not be useful in that design.... There is an african wind power unit close to here.... I may get the owner to give this a try..... but 90% of the time is is dumping anyway... which may be problematic. ..........oztules Village idiot...or... just another hack out of his depth |
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DaveP68 Senior Member  Joined: 25/11/2014 Location: New ZealandPosts: 292 |
Yes I did in this case. But please note Phill did too with him making reference to Tesla's narcissistic behavior in the quote below. I take exception to a comparison like that as the only link with Tesla I was trying to make was related to him giving information away free. All I asked of Phill before he stepped over the mark himself, was to give me the courtesy of a reply. He had gone completely silent, even after asking him to back up his facts when I had asked him questions. He's the only one here that does it to me. Lets leave it their for both Phill and I. I still have lots to contribute to this forum. But have little tolerance to any more critical replies from the likes of Phill thanks. There are realities if you do not accept, will lead to frustration because you will be spending time on wrong assumptions and the results cannot follow! The Dunning Kruger Effect :) |
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| DaveP68 Senior Member Joined: 25/11/2014 Location: New ZealandPosts: 292 |
Will be only too happy to give you the results. As if it performs the way you describe it will give an even great range of operation and overcome some present operating limits when charging batteries. David There are realities if you do not accept, will lead to frustration because you will be spending time on wrong assumptions and the results cannot follow! The Dunning Kruger Effect :) |
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| flc1 Senior Member Joined: 20/11/2011 Location: New ZealandPosts: 242 |
Hi Kitestrings, yes my previous turbine was fitted with 2 x 36pole stators,It did have a one 42pole on it and a 36 at the start,but I changed it to two 36pole,got a good output from the two, Im currently rebuilding that turbine and will be useing 36 pole stators, I don't use the 42 pole stators ,they have too much cogging, I think davep68 has a lot of data you would find useful for comparison of the 36 and 42 poles,Its not data from a working turbine,but I rekon its still a good comparison, I have never kept much data myself from the two diffrent types.Both fillm and Davep68 have shown that you can get good power from both types of stators and both have shown that the 36 with a blackcap can give a bit more than a 42,and then theres cogging ..so I sappose theres your awnser. |
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| DaveP68 Senior Member Joined: 25/11/2014 Location: New ZealandPosts: 292 |
Hey Fred Just to add one more thing to this topic re wind turbine output power which I know you will understand. I find it amazing that wind turbines that are built with a "specified" peak output power potential, but the W/hrs of “ ACCUMULATED POWER “ is never stated!! That is of course not possible to know until is in production at the chosen site. Specified peak power output potential is what people focus on. It's like say the engine size in a car, but not taking into account the fuel economy so much. I've seen wind turbines advertised on websites with a 2 kW version commanding almost double the price of a 1 kW version. This means something to those doing the purchase of the end product and again no mention of what the “ ACCUMULATED POWER “ will be! The up shot of what I'm trying to point out here, is an F&P 36 pole copper stator with black cap WILL MAKE MORE “ ACCUMULATED POWER “ than any 42 pole stator... End of discussion as far as I'm concerned  There are realities if you do not accept, will lead to frustration because you will be spending time on wrong assumptions and the results cannot follow! The Dunning Kruger Effect :) |
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