Author Topic: Active Pitchcontrol  (Read 332082 times)

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piglet2

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Re: Active Pitchcontrol
« Reply #132 on: March 05, 2012, 05:00:26 PM »
Check out something called DUINOMITE MINI.
It is a very small 25$ 2" x 2" 5V PIC-computer using basic.

I bought one.

/Piglet

NoSmoke

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Re: Active Pitchcontrol
« Reply #133 on: March 06, 2012, 03:05:12 PM »
Check out something called DUINOMITE MINI.
It is a very small 25$ 2" x 2" 5V PIC-computer using basic.

I bought one.

/Piglet


Piglet, also very nice micro-computers (no PC needed to program or provide keyboard & monitor functions) but, looking through the instruction set I see nothing for pulse count, PWM or servo.  Are they available as library functions and if so, where would I find them?


NoSmoke

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piglet2

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Re: Active Pitchcontrol
« Reply #136 on: March 07, 2012, 02:49:30 AM »
Check this: 
http://www.olimex.com/dev/DUINO/DUINOMITE/DuinoMite-UM-1-03.pdf
and this: 
http://geoffg.net/Downloads/Maximite/MMBasic%20Language%20Manual%20V3.1.pdf

OK, it appears to have PWM - out of the audio port.
Yes, and if You want to use other pins for that, also the instruction "PULSE pin, width".
Will generate a pulse on 'pin' with duration of 'width' mS.
'width' can be a fraction. For example, 0.01 is equal to 10 μS.

For a pulse of less than 1 mS the accuracy is ± 1 μS.
For a pulse of 1 mS or more the accuracy is ± 0.5 mS.

Extremely easy to program tough little PIC32 computer, especially if You are familiar with Basic. :)
It has also built-in flash memory, this works as drive A:, also any micro-SD card will work as drive B:

/Piglet

midwoud1

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Re: Active Pitchcontrol
« Reply #137 on: March 07, 2012, 02:16:13 PM »
The Arduino controller is connected with the windgenerator. (working good )
Start feathering 350 Rpm .....unfeather at 200 Rpm .
Variable input sensor volt , delay time.                                                                                       An interface is made to protect the controller input max. 5 volt. Gate A-0.
The digital outputs 12 and 11 are connected with a  relay card.
The relays are switching the pitch actuator in and out.
I have no experience with Language - C - other than the Arduino starter manual.
Have had professional assistance.
Looking for a good book.

Nosmoke and Piglet2 . The Duinomite looks good , I think you can things made moving.
And you know Basic .
I see similarity with the UNO .
Are you planning to let it work with pitch-control too ?
In the near future we can make our own MPPT controller with Lcd display

- Frans -

piglet2

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Re: Active Pitchcontrol
« Reply #138 on: March 07, 2012, 05:48:41 PM »
Look, this basic is so easy to use that You will learn it in one hour.  Or two!
Please check the earlier links, there is the manual.
The small PIC32 computer can also use C.

/Piglet

NoSmoke

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Re: Active Pitchcontrol
« Reply #139 on: March 07, 2012, 07:23:32 PM »
Piglet, the thing with PWM is that it should run continuously in the background (same as a servo function) and is thusly implemented in hardware as I understand it on the PIC micros.  Using pulse output would not do that would it, unless running in a background program but I don't know if the Duinomite Basic does that.  Surely the Duinomite processor does support PWM at the hardware level (and with multiple PWM capability I would guess) so it seems odd that Duinomite Basic does not seem to support it directly at the output pin level(?).

Frans, I would be interested in seeing your C code if you could post it.

midwoud1

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Re: Active Pitchcontrol
« Reply #140 on: March 08, 2012, 08:15:27 AM »
Blade pitch  with a microcontroller and a water heater , It's not a dumpload but to make coffee and tea.
Arduino Uno  , C code will follow.

           
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mbouwer

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Re: Active Pitchcontrol
« Reply #141 on: March 10, 2012, 02:56:57 PM »
Hallo Frans,

What do you think about making new coils to get 220 or 380 volts?

Regards Rinus

midwoud1

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Re: Active Pitchcontrol
« Reply #142 on: March 11, 2012, 06:07:27 AM »
Hi Rinus.
I know you have a 4,5 mtr turbine under construction . In Hugh's Recipe book I found the number of coils and windings page 38 .
Wire diam 0,95mm ,windings 250 . That gives an output of 140 - 350 volts ,suitable with a Windy Boy inverter for grid tie. Or heating elements .
You also have Pitchcontrol and with a micro-controller you can keep your output volts between the limits and avoid overspeed .
Marijn Innotech has the same idea with a 24 volt windturbine. Looks proffesional.

  - Frans -

mbouwer

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Re: Active Pitchcontrol
« Reply #143 on: March 19, 2012, 04:42:25 PM »
Hallo Frans,

Many windmillfriends are eager to use active pitchcontrol.
How can we simplify the hardware e.g. avoiding the bevel gears?

Regards Rinus

sunbelt57

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Re: Active Pitchcontrol
« Reply #144 on: March 19, 2012, 05:24:17 PM »
You are not gonna smoke an alternator in eight seconds.

Maybe not but how about overspeed to destruction?
Depending on rotor size a LOT can happen in 70 MPH wind in 8 seconds

Just saying..
Here in Wyoming we can get gusts up to 50 MPH from the West when the weather changes. A microprocessor would be good to control it because you could tie in other input like barometric pressure. When you're expecting high winds you can tell it to be careful when seeking higher tsr's.

midwoud1

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Re: Active Pitchcontrol
« Reply #145 on: March 19, 2012, 06:07:14 PM »
It can be simplyfied to leave the bevel gears away , In my first design I made it that way but it did not work I wanted . If we make the push-pull rod better fit in the hollow shaft with a bronze bushing easy sliding we will have a good result. I think the Innotech collegues make like that. In a couple of weeks we can see their results . Keep the spider in the center line.

 - Frans -

midwoud1

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Re: Active Pitchcontrol
« Reply #146 on: March 19, 2012, 06:24:59 PM »
Sunbelt 57
The actuator moves in 9 steps . The blades make 10 degrees a step . Between the steps  there is a dalay of 4 seconds that works good in a normal situation . I have a direct respons on the propellerspeed . There is an anemometer signal on a second input of the m-controller
In a gust a signal commands 9 seconds and turn the blades in full feather at once.
Another fact , we have no sudden increasing windspeed here ,so no danger of destruction.
It can be 9 Bft and the propeller is already safely in parking position.

- Frans -

JW

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mbouwer

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Re: Active Pitchcontrol
« Reply #148 on: March 21, 2012, 08:45:54 AM »
Hey Frans,

You have made your turbine with tree blades.
Now it is known that with less blades you can generate more energy out of the wind.
I wonder: have you ever thought of using two blades, ore one?

Regards Rinus

fabricator

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Re: Active Pitchcontrol
« Reply #149 on: March 21, 2012, 05:27:33 PM »
One has been tried by lots of people, they are very problematic as far as balance and vibration go, two is almost as bad, three is the generally accepted trade off because they are easier to balance and the vibration problems are easier to deal with.
I aint skeerd of nuthin.......Holy Crap! What was that!!!!!
11 Miles east of Lake Michigan, Ottawa County, Robinson township, (home of the defacto residential wind ban) Michigan, USA.

midwoud1

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Re: Active Pitchcontrol
« Reply #150 on: March 24, 2012, 01:38:18 PM »
Just an impression of the size of the spinner.
Windmill Enercon E 126  under construction in my place .

- Frans -

fabricator

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Re: Active Pitchcontrol
« Reply #151 on: March 24, 2012, 02:08:20 PM »
Wow, I'll bet they got REALLY big battery drill to pitch those blades!
I aint skeerd of nuthin.......Holy Crap! What was that!!!!!
11 Miles east of Lake Michigan, Ottawa County, Robinson township, (home of the defacto residential wind ban) Michigan, USA.

sunbelt57

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Re: Active Pitchcontrol
« Reply #152 on: March 26, 2012, 04:13:24 PM »
Frans:
After watching the video enough times I think I can buy or build the pieces. I'm not quite sure how the rest of it works. Does the rod that pushes that hexagonal plate out have to be on bearings or does it spin with the blades?

midwoud1

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Re: Active Pitchcontrol
« Reply #153 on: March 26, 2012, 04:58:00 PM »
Hi Sunbelt57.
The pushrod  is fixed on the hexagonal plate , and has a bearing in a housing on the
actuator . The actuator rod stroke , I have 80 mm .  10 mm / sec.
Attention the actuator rod may not turn. I made a guiding.
Many factory actuators can rotate.
If you have any questions feel free to ask.

- Frans -

SparWeb

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Re: Active Pitchcontrol
« Reply #154 on: March 27, 2012, 12:55:14 AM »
They've broken the 100 meter barrier!

More for those who like BIG:    http://www.astroman.com.pl/?mod=magazine&a=read&id=900

No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
System spec: 135w BP multicrystalline panels, Xantrex C40, DIY 10ft (3m) diameter wind turbine, Tri-Star TS60, 800AH x 24V AGM Battery, Xantrex SW4024
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fabricator

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Re: Active Pitchcontrol
« Reply #155 on: March 27, 2012, 09:05:33 AM »
Awesome, now they are "wind energy converters" not turbines anymore, you see how they broke the barrier, they extended the blade mounts, looks like maybe 50 feet. Damn, they are building power plants in the sky.
I aint skeerd of nuthin.......Holy Crap! What was that!!!!!
11 Miles east of Lake Michigan, Ottawa County, Robinson township, (home of the defacto residential wind ban) Michigan, USA.

NoSmoke

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Re: Active Pitchcontrol
« Reply #156 on: March 27, 2012, 12:18:50 PM »
I see they are using direct drive alternators (I though the v big turbines always used gear-ups).  I wonder what type of magnets they use?  Maybe that's one reason the price of neos has increased so much.

fabricator

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Re: Active Pitchcontrol
« Reply #157 on: March 27, 2012, 04:50:39 PM »
As far as I know they use neos in those things, thousands of pounds of them.
I aint skeerd of nuthin.......Holy Crap! What was that!!!!!
11 Miles east of Lake Michigan, Ottawa County, Robinson township, (home of the defacto residential wind ban) Michigan, USA.

Bruce S

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Re: Active Pitchcontrol
« Reply #158 on: March 27, 2012, 05:25:38 PM »
As far as I know they use neos in those things, thousands of pounds of them.
I'm thinking probably NOT  :o
IF so those guys working on them could not even the slightest iron based metal even close.
More likely they use an induction or something similar to the car alternators that use an exciter type of system.
Just a guess on my part too, would really like to know by seeing one in person  :)
Cheers;
Bruce S
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midwoud1

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Re: Active Pitchcontrol
« Reply #159 on: March 27, 2012, 05:41:07 PM »
They use electric coil magnets ,with that you can regulate magnetic field and output .
Like our car alternators.
Neos of 100 kilos each and lets say 150 of them is a disaster.
All tools hammers spanners screwdrivers and even your wallet will attract to it ,
Putting the rotor on the stator is impossible ,Look at the force of our mini rotor-discs.
Enercon makes directdrive ,Rotorspeed 9 - 11 Rpm ,generator diam 12 meters.
They dont like gearboxes . ( maintenance )

- Frans -

Bruce S

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Re: Active Pitchcontrol
« Reply #160 on: March 27, 2012, 05:43:40 PM »
I'm waiting to see even the Next Gen ones were they start using super-conductors.
:-)
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midwoud1

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Re: Active Pitchcontrol
« Reply #161 on: March 27, 2012, 06:03:55 PM »
Mounting the generator and the blades.

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fabricator

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Re: Active Pitchcontrol
« Reply #162 on: March 27, 2012, 07:07:51 PM »
OK, I stand corrected, SOB those things are awesome, absolutely majestic, I wish they would put one in my backyard, the sheer size of everything is incredible, you would think they would start putting elevators in these monsters.
I aint skeerd of nuthin.......Holy Crap! What was that!!!!!
11 Miles east of Lake Michigan, Ottawa County, Robinson township, (home of the defacto residential wind ban) Michigan, USA.

windvision

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Re: Active Pitchcontrol
« Reply #163 on: March 27, 2012, 10:32:43 PM »
Fabricator:

  Actually, you are correct. Many of the new style turbines are direct drive with neo magnets. Enercon uses electric coil magnets and that is what you are looking at. Goldwind, Siemens, even the new 2.5 MW GE is neo magnet with direct drive.

  Gearboxes are on the way out on the commercial machines. It's just a matter of time.

joestue

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Re: Active Pitchcontrol
« Reply #164 on: March 28, 2012, 04:45:08 AM »
Even if they were to use Neo's they would still have to wrap copper around them anyway to provide for flux weakening at the high rpm end of the curve.

I would not be surprised if they are running 1.7 to 1.8T field strengths on those coils, and the cores are probably built up using structured grain oriented steel, running as close to zero air gap as they can get. (structured as in the teeth are pressed into a "V" punched into the back iron. (there's probably some kind of a notch they make in the "V" to lock the tooth into the core.) The back iron itself being made from say 24 pieces to complete the 16? foot diameter core.

midwoud1 do you know what topology they are using for the inverters, and what the switches are made from?
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