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Forum Index : Windmills : 2053 W from 36 pole with black rotor cap
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DaveP68 Senior Member  Joined: 25/11/2014 Location: New ZealandPosts: 292 |
Decided to run up both a 36 pole copper with black rotor cap and 42 pole 80s stators to very high RPM. First test was a 36 pole copper stator wired 12x 1p Delta with output of 2053 W at 1740 RPM. Other readings were 59.5 VDC at 34.5 Apms. Using a cap doubler got the same 2053 W output but this time @ 1025 RPM. All from same 36 pole stator wired 12x 1p Delta (volts/amps as above just lower RPM). That is 2W per 1 RPM!! Next test was with a 80s 42 pole stator wired 14x 1p Star got 1575 W at 1870 RPM with other readings of 57.4 VDC at 27.44 Apms. Tried capacitor doubler on the 42 pole stator, but it kept going into saturation as current went past 23 Apms at around 1200 RPM. I think it would work better if the stator was wired as 14x 1p Delta. But didn't bother as it still would be way under the output of the 36 pole with it's capacitor doubler result. Got access to a VFD and a lathe now to achieve this, so my drill has now been retired. Here's a link to a video on YouTube of a small Hydro system running 4x 36 pole copper stators black caps a with combined output of 8 kWh @ around 1700 RPM. They are all wired 4x 3p Delta into 2x dual input MPPT Grid Tie Inverters. This all proves my results are valid  8 kw powerspout micro hydro system by Tas Energy & Heating These outputs are of course not relevant to what RPM's a wind turbine can produce. But as I've seen figures around 1500 W posted on here of what some stators are able to put out, had go and check the results for myself. Again the 36 pole copper stator came out on top at 40 % more power output for the same RPM any 42 pole can do.  These are realities that, if you do not accept them, will lead to frustration because you will be spending lots of time on wrong assumptions and the results cannot follow! 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 |
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
If they are loaded properly, in theory star and delta are equivalent... Knowing this it is sensible to assume the star-delta diodes will only help a non-ideal loaded system..... which will be all of them I suspect, unless the mppt algorithm is carefully programmed..... Look forward to further tests using the extra diodes when you get a chance, and we will see if the auto alternator makers are onto something. The practical limit to my F&P knowledge, is with using them as a motor to drive the cp800 mono pumps, using a bldc controller I made for it... never really as an alternator though. ..........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 |
Hi oztules I've been saying all along that load matching is critical for maximum power output potential, no matter how these F&P stators are configured star or delta. If you expect to get the same/more current in star than delta mode for the same wiring set up i.e. 6x 2p or 7x 2p then sadly wrong assumption. I've seen pictures on here of a stator claiming to be in delta mode but with careful viewing is in star mode. The current reading on the Amp meter next to it showed the expected "star output" reading anyway. Can't be fooled is what I'm saying... Did try a quick test as suggested with the extra set of diodes from star point on a star 80s stator yesterday, but put no more current out than a standard star unit. Was only one test on one unit that was sitting on the shelf. Will try again on another stator in case set up was not correct. 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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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
I think the extra diode thing will probably be worthy of its own thread so I'll start one. 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 |
Dave, The extra diodes won't work on a properly loaded machine.... only when it is poorly matched. Then the star voltage will sag, while the dleta catches up to it, and then it can augment it.... before that ( or if matched, and the emf allowed to rise proportionally) then the star will always be above the delta, byt about 1.6:1, so the delta emf will be lost in the background, and cannot contribute until the star has sagged at least below the delta figure. Because you know what your doing, you are likely to be matching the load fairly well, and so the delta "switch " will not happen, you will have to loose at least half the EMF in the coils in star before the delta should kick in. We should transfer this part over to Gizmo's other thread, in fact I will copy this answer over to there, and that may help others understand what i/we are trying to explore. ........oztules Village idiot...or... just another hack out of his depth |
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