Author Topic: Active Pitchcontrol  (Read 331854 times)

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hiker

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Re: Active Pitchcontrol
« Reply #792 on: July 21, 2017, 08:30:53 PM »
What kind of voltage are you shooting for ? no dout it will be shocking !😜
WILD in ALASKA

mbouwer

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Re: Active Pitchcontrol
« Reply #793 on: July 22, 2017, 04:54:28 AM »
A coil with 0,5 mm wire gives 0,4 volt. So what is wise?

While I try to build a small mill it's the exchange of ideas, and if possible also of parts, I like most.

The material to put together the rotor.


 

hiker

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Re: Active Pitchcontrol
« Reply #794 on: July 22, 2017, 04:48:49 PM »
The rotor can be solid...or your just using what's available?  Can't wait to see the finale build...the fun part is always the build..
WILD in ALASKA

mbouwer

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Re: Active Pitchcontrol
« Reply #795 on: July 23, 2017, 04:33:05 AM »
If laminated has no advantages next time I will make it solid.
« Last Edit: July 23, 2017, 04:44:17 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #796 on: July 23, 2017, 12:35:40 PM »
Regularly, also like today, I mow with my electric powered ride-on mower.
It would be nice to do that with energy generated by my own mill.

hiker

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Re: Active Pitchcontrol
« Reply #797 on: July 23, 2017, 03:20:22 PM »
Coils need the lams to help control the eddy currants...other wise you get a lot of extra drag..less output..looks great
WILD in ALASKA

joestue

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Re: Active Pitchcontrol
« Reply #798 on: July 23, 2017, 04:10:54 PM »
the rotor only deals with eddy currents according to the change in flux in the magnet, which is usually rather small.

My wife says I'm not just a different colored rubik's cube, i am a rubik's knot in a cage.

hiker

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Re: Active Pitchcontrol
« Reply #799 on: July 23, 2017, 09:39:53 PM »
Solid rotor..lams for coils....guess I should have clarified..😜
WILD in ALASKA

joestue

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Re: Active Pitchcontrol
« Reply #800 on: July 24, 2017, 01:16:37 AM »
Well, whatever. Highspeed machines would benefit from laminated magnets.

Anyhow as I said before you need all of the magnets and one test coil, and then take 95% of that to get open circuit volts.

Alternatively you could setup.. a single magnet, or three of them. Fix the rotor to a pendulum and let it swing back and forth ( for 40 magnets) 18? degrees of travel. I suppose the volts you get out might be accurate... idk. Anyhow it will be rather low frequency so you'll have to rectify the output, charge up a capacitor and measure the dc volts with a high impedance volt meter.of course this assumes zero lost volts in the diodes

Anyhow I can't see how you can measure the volts from a single coil and a few magnets without an oscope and a spectrum analyzer.. if you do the pendulum gig, an oscope alone should suffice
« Last Edit: July 24, 2017, 01:22:00 AM by joestue »
My wife says I'm not just a different colored rubik's cube, i am a rubik's knot in a cage.

mbouwer

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Re: Active Pitchcontrol
« Reply #801 on: July 24, 2017, 04:34:43 AM »
Because I might want to reduce the rotor outer diameter to use thicker magnets
I now have fastened the 46 magnets 20x10x2 with cellotape.

mbouwer

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Re: Active Pitchcontrol
« Reply #802 on: July 25, 2017, 10:41:34 AM »
At 60 rpm the 0,5 mm coil shows 1 volt and the 0,14 mm coil 10 volts.

mbouwer

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Re: Active Pitchcontrol
« Reply #803 on: July 26, 2017, 09:03:34 AM »
What wire thickness do I choose if I want to use the energy of the mill directly for heating?

 Meanwhile I try to improve the yaw slide bearing of reply # 589

joestue

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Re: Active Pitchcontrol
« Reply #804 on: July 27, 2017, 12:15:30 AM »
What wire thickness do I choose if I want to use the energy of the mill directly for heating?

 Meanwhile I try to improve the yaw slide bearing of reply # 589
Ultimately it doesn't matter. as long as the practical voltages and currents produced by the alternator are within reason.

amps below what wouldn't be cost effective to run the transmission line.. volts below what would kill you if you touch it.. if that's something you care about..

personally i'd wind it for a voltage that corresponds to the normally available resistances of standard heating elements.. in the range of 1500 watts for 120 volts, or 3500-4500 watts for 240v water heater elements.. according to the amount of wind power you can get.

what diameter of blades are you going for?
My wife says I'm not just a different colored rubik's cube, i am a rubik's knot in a cage.

mbouwer

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Re: Active Pitchcontrol
« Reply #805 on: July 27, 2017, 01:01:52 PM »
As for the generator:
say 50 volts max?

mbouwer

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Re: Active Pitchcontrol
« Reply #806 on: July 28, 2017, 06:13:41 AM »
simplified welded yaw bearing sprocket.

joestue

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Re: Active Pitchcontrol
« Reply #807 on: July 28, 2017, 09:59:20 AM »
As for the generator:
say 50 volts max?

And how much power are you going to get from the blades at what rpm?

My wife says I'm not just a different colored rubik's cube, i am a rubik's knot in a cage.

mbouwer

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Re: Active Pitchcontrol
« Reply #808 on: July 28, 2017, 03:07:55 PM »
With a gearbox and an asynchronous motor as generator we have made ( with varying degrees of success ) blades up to 6 m. diameter.
Max 60 rpm. With active pitchcontrol applied that is no problem.

With this generator, I don't know yet what output I can get.
Only then I can determine the blade diameter.
« Last Edit: July 28, 2017, 03:20:47 PM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #809 on: July 29, 2017, 07:13:14 AM »
The top of the mast as a pole for a new test stand.

mbouwer

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Re: Active Pitchcontrol
« Reply #810 on: July 30, 2017, 05:01:21 AM »
Yaw bearing hub.

hiker

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Re: Active Pitchcontrol
« Reply #811 on: July 30, 2017, 10:38:59 PM »
Nice...if your going for heat...ide go with the thicker mags..the thin mags lose their stringht under a large load...due to the coil having a reverse field when they pass over the coil..coils..
WILD in ALASKA

mbouwer

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Re: Active Pitchcontrol
« Reply #812 on: July 31, 2017, 05:40:40 AM »
My intention now is to make a well-arranged test stand and have, together with windmillfriends, a critical look at all components.

mbouwer

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Re: Active Pitchcontrol
« Reply #813 on: August 01, 2017, 07:41:55 AM »
Yaw axle. The heavier the nacelle the more reinforcement sheets I would like to add.

mbouwer

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Re: Active Pitchcontrol
« Reply #814 on: August 02, 2017, 05:16:23 AM »
Next issue: the yaw drive.

mbouwer

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Re: Active Pitchcontrol
« Reply #815 on: August 03, 2017, 05:01:45 AM »
As a side note:
How about shaping the lamination core out of disassembled transformer laminations?
« Last Edit: August 03, 2017, 06:29:15 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #816 on: August 04, 2017, 05:30:31 AM »
The yaw bearing should turn less than 1 rpm. I could use this cordless screwdriver motor ( 180 rpm ) with one more reduction.

mbouwer

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Re: Active Pitchcontrol
« Reply #817 on: August 05, 2017, 06:20:24 AM »
After mounting an extra planetary reduction of a cordless drill I have a good outgoing speed. 
But I think the torque is overdone, in fact the motor could be much smaller and it's too complicated this way.
I want to search for a smaller engine with the proper reduction.

JW

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Re: Active Pitchcontrol
« Reply #818 on: August 11, 2017, 09:12:46 PM »
I am really happy this thread is still in tacked.

hiker

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Re: Active Pitchcontrol
« Reply #819 on: August 11, 2017, 09:22:06 PM »
I agree...wating  on latest progress report...😜
WILD in ALASKA

mbouwer

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Re: Active Pitchcontrol
« Reply #820 on: August 13, 2017, 02:03:54 PM »
As an aside relating to reply #796
I converted my electric powered ride on mower to a forklift like shape. The swing arm pivot of the power supply cable is attached to the top of the mast. Easier steering and riding around now.
« Last Edit: August 13, 2017, 02:09:16 PM by mbouwer »

MattM

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Re: Active Pitchcontrol
« Reply #821 on: August 13, 2017, 05:22:24 PM »
No doubt you get a lot of second looks in that rig.

hiker

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Re: Active Pitchcontrol
« Reply #822 on: August 13, 2017, 07:33:53 PM »
Lawn mower on steroids...with that you could trim the tops of hedges..or even give someOne..a flattop crew cut..😜
WILD in ALASKA

frackers

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Re: Active Pitchcontrol
« Reply #823 on: August 13, 2017, 08:08:55 PM »
You could tackle some REALLY long grass with that...
Robin Down Under (Or Are You Up Over)

mbouwer

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Re: Active Pitchcontrol
« Reply #824 on: August 14, 2017, 08:02:17 AM »
Actually I like this way of mowing because it brings less damage to the environment.
My big goal is to be able to mow with the energy of my, in cooperation with windmillfriends built, small windturbine.