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DaveP68
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Posted: 14 August 2017 at 10:16pm | IP Logged Quote DaveP68

Hey Fred

Yep can do, will send it down along with with some more F&P dump load resistors.

Just need to fine tune it, so it works correctly and extracts the maximum power in the 500 to 600 RPM range.

Here's a photo of version 1 used for testing.




David

Edited by DaveP68 on 14 August 2017 at 10:36pm



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flc1
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Posted: 15 August 2017 at 12:21am | IP Logged Quote flc1

Thanks Dave
looks good, small size
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DaveP68
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Posted: 15 August 2017 at 12:45am | IP Logged Quote DaveP68

Less is more

When using a capacitor doubler, found that the required torque was much greater with more power in for a given output. Max output with the drill was 700 W.

Just completed another test and got 870 W @ 488 RPM so this is now the gift that keeps giving!! Haven't even optimized it yet, so expect that number to keep going up. But a jump of 170 W over a capacitor doubler using the same drive system is a very big change!!

Will keep you updated as know you will be putting up the wind turbine soon and don't want to hold up your progress.

David
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flc1
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Posted: 15 August 2017 at 8:36am | IP Logged Quote flc1

wow, now thats the sort of output we want from an f n p !
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DaveP68
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Posted: 16 August 2017 at 3:39am | IP Logged Quote DaveP68

Hi Fred

It works by removing the peak current pulses that occur due the narrow conduction angle of the 3 phase rectifier.

Here's an illustration of "NO" power factor correction on a single phase rectifier.



Here is a 3 phase power factor correction capacitor circuit.



Hope this now makes sense in what I'm describing.

David

Edited by DaveP68 on 16 August 2017 at 4:10am
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flc1
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Posted: 16 August 2017 at 11:44pm | IP Logged Quote flc1

I wonder if a power factor correction setup would work with a cap doubler on 1 stator?
Has anybody tried that?
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flc1
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Posted: 21 August 2017 at 11:30am | IP Logged Quote flc1

well the high voltage inverter has finally arrived in nz,

Now I just have to pay the huge ransom demanded by the highly likeable nz customs and then the inverter is "released" to me.
I must be punished for my sins... fancy trying to import somthing thats not manufactured here in nz?

how dare I even attempt such a thing.

Edited by flc1 on 21 August 2017 at 11:42am
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flc1
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Posted: 24 August 2017 at 12:58am | IP Logged Quote flc1



New 40-540dc blue inverter , and the yellow voltage controller and the dumpload resistors




one of the 45-90dc inverters from my old dual fnp ,with home made dumpload resistors.
a huge diffrence in size ( and cost) between the two setups, but "hopefully" with the new larger setup I will get over 1 kw from 1 stator.

Edited by flc1 on 24 August 2017 at 1:32am
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DaveP68
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Posted: 24 August 2017 at 8:40am | IP Logged Quote DaveP68

Hi Fred

Well done, that looks an impressive new inverter. It should extract the maximum possible output power from a single 36 pole copper stator with black cap.

Forget those crappy old 42 pole stators, if you can get access to 36 pole stators that output 40 % more power for the same given RPM.

This just has to work better and provide far more "accumulated power" over say a 42 pole dual that has been tried by a few on here.

If you did go with a dual 36 pole set up with a suitably up rated 40-540 VDC inverter you could get a peak output of up to 2.5 kW. With a triple stator set up a peak output of 4 kW could be possible.

You're about prove my point about F&P stators like to operate over a wide voltage range with the current kept at an optimum value for their best power extraction.

Ok results can be achieved into batteries, but requires rewiring of stators and needs to be a dual setup to give any meaningful output.

Looking forward to seeing some real world results.

David
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flc1
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Posted: 28 August 2017 at 2:02am | IP Logged Quote flc1




inverter cabinet
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DaveP68
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Posted: 30 August 2017 at 7:08am | IP Logged Quote DaveP68

That inverter looks like a 'Load Adaptive Impedance Matching' type which suits those F&P 36 pole copper stators. I know of a member on here earlier this year asked "where do I get one of these? May-be It's down in the South Island in Middle Earth" Well a message to that member they come from a company in China.

Edited by DaveP68 on 30 August 2017 at 7:11am
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domwild
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Posted: 31 August 2017 at 6:17am | IP Logged Quote domwild

DaveP68 wrote:
Less is more

But a jump of 170 W over a capacitor doubler using the same drive system is a very big change!!

David


David, am easily confused. Are you saying your system as per the diagram is better than the capacitor doubler system? If so, what are the cap. values please.

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