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Forum Index : Windmills : 5 watt gen

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windtinker
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Joined: 16/01/2012
Location: New Zealand
Posts: 38
Posted: 04:02pm 12 Sep 2012
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Hi
I would like some ideas or help to build a 5 watt gen. It has some catches, it should make 1 volt and 5 amp, be cheap as possible, and can have high ac frequency.

Cheers
Andy
 
MacGyver

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Joined: 12/05/2009
Location: United States
Posts: 1329
Posted: 05:47pm 12 Sep 2012
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Windtinker

More information is needed. This could be as simple as one of those flashlights you shake or as complicated as an axial-flux generator. That's a lot of amperage for one volt. I'm curious what you're intentions are for the generator's use.


. . . . Mac
Nothing difficult is ever easy!
Perhaps better stated in the words of Morgan Freeman,
"Where there is no struggle, there is no progress!"
Copeville, Texas
 
windtinker
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Joined: 16/01/2012
Location: New Zealand
Posts: 38
Posted: 06:05pm 12 Sep 2012
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MacGyver
I will be doing some high voltage experiments, driving a ignition coil(ac 1amp makes about 1600volt, would like 20k :) ). I don't mind building a axial-flux and have read otherpowers howto on them and Dan B book, just need some idea on coils and mags data if going that way.

Thanks
Andy
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 12:46pm 14 Sep 2012
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Hmmmm.....
This sounds like an electric fence project ?

It will be much more efficient to start off with a much higher voltage than one volt, charge up a capacitor, then dump the capacitor into your coil perhaps once every second.
Cheers,  Tony.
 
windtinker
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Joined: 16/01/2012
Location: New Zealand
Posts: 38
Posted: 09:50pm 14 Sep 2012
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Just mucking around with charging caps in series then discharge them in parllel. Found a Gentle Annie at ecoinvations for 100watt $60 bucks, it should do.

This is abit off topic but being test a field coil motor , send pulsed dc into the coil makes ac in the stator, with turning it ,it start to produce more power than the field coil took,with 12volt trickle charge at 1rpm . Might be a cheap generator
 
Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 06:31am 16 Sep 2012
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[quote]This is abit off topic but being test a field coil motor , send pulsed dc into the coil makes ac in the stator, with turning it ,it start to produce more power than the field coil took,with 12volt trickle charge at 1rpm . Might be a cheap generator [/quote]

What the hell are you on about, or what are on?

It makes no sense and has a hint of over unity to it.
Sometimes it just works
 
windtinker
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Joined: 16/01/2012
Location: New Zealand
Posts: 38
Posted: 09:11am 16 Sep 2012
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Theres no over unity :) .For a field wound motor, instead of flat dc you pulse it, abit of the power is transferred by transformer action so the starting voltage at 1 rpm is above zero. You still need to spin it to make the amps and increase the voltage.
If you pulse it quick enough at stand still it will start at battery charging voltage, you start spining it up to start produce more power than transformer action, which should take not many rpms to brake even.

I tested a motor with pulsed dc, at stand still it was about 1 volt, 6mA, then spining it by hand rasied it to 1.5 volt 35 mA. Still was using more power than what was made(12volt 1amp), but the motor is about 2000rpm type.
 
Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 03:40pm 16 Sep 2012
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You are better off with a permant magnet (PM) motor then any field wound motor.
If its field windings you want to play with try a car altenator, much more efficent than some induction motor in your application.

Although a car altenator is a lot less efficent than a PM motor as a generator.

Why is it you want to use power to attempt to make power in the first place, its not what i would consider a practical method unless the generator is mechanically driven with a motor of some sort at high rpm.

The pulsed DC is only inducing a magnetic flux into the inner windings which produce a voltage out, where a PM will do this without the need of any power to produce the magnetic field.

Originally i understood the Gentle Annie motor was a PM motor (as some are) not an induction motor.
Sometimes it just works
 
windtinker
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Joined: 16/01/2012
Location: New Zealand
Posts: 38
Posted: 07:42pm 16 Sep 2012
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Yeah the Gentle Annie is, and to get a working turbine probably will go that route.
It a hobby of mine mucking around with different designs not so much running of the grid, just tell me to shut up if it gets annoying :)

What would be the output of a axial flux, with two wires in hand with one set of wires connected to pulse dc. The pulse would ajust the voltage electrically rather than rpm(low wind conditions or long transmission distance)
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 07:51pm 16 Sep 2012
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What?
You mean like an air cored transformer with no permanent magnets in the rotor?

I don't know what you are trying to achieve with this, but it sounds like a huge waste of time.
Cheers,  Tony.
 
Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 08:04pm 16 Sep 2012
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Sounds to me you are trying to knock the corners of a square block of stone to reinvent the wheel.

I agree with Warpspeed, with you are just wasting time tring to do what wont work worth crap.

Why do so many think they have the answers without having a clue of what works and why, the forum and many members have been involved in RE for years and dont do things a given way for no good reason.

As for your winding question the answer is, how long is a piece of string?
without knowing wire size, number of turns used, magnetic flux applied to the coils, rpm or cycles of flux lines cutting the coils, number of coils to magnet ratio, etc, it is impossible to answer your question.
Sometimes it just works
 
windtinker
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Joined: 16/01/2012
Location: New Zealand
Posts: 38
Posted: 09:10pm 16 Sep 2012
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The mill is going to be a hawt, using the 1.55m blades from ecoinvations? , below is the idea

Thanks


 
Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 10:34pm 16 Sep 2012
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Is this a 2 phase generator with 4 magnet pairs or wired as single phase?

Your post here is like a cat on hot bricks, its all over the place, no one can get a grip on what you want to do.

Slow down a little and tell us what you intend to do, pulsed DC and other great ideas in your head is doing our head in.

There is no magic formula to answer your questions outside a tested and proven design, other than what is involved of how to design a system to work effectively to the required needs.

Its all a balancing act of blades, rpm, cutin voltage, power out, magnets used, coil turns, wire size, Etc, etc, etc, etc, etc,.................................

I could scratch around in my underpants and pull out some figures for you, but they will be of little use.(and smell bad)

The forum has a search facility you can use to view past threads on AXFX design, and after some time you will realize only a few prove effective, and the methods involved to achieve that. many here have taken the time to post their full development from start to finish with honest results, and you should do the research to understand the science behind how to design an alternator.

We will help you where we can, but a dog in a bone yard approach will not help you move forward and wont get answers from those in the know.


Pete.
Sometimes it just works
 
electrondady1
Senior Member

Joined: 12/02/2009
Location: Canada
Posts: 208
Posted: 02:36am 18 Sep 2012
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i find the diagram confusing .
if you want low voltage and high amperage build a single phase stator.
one coil per mag.
run the coils in parallel rather than series.









 
windtinker
Newbie

Joined: 16/01/2012
Location: New Zealand
Posts: 38
Posted: 04:00pm 26 Sep 2012
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The ignition coil idea, I'm running off solar-panels.
The pulsed dc was a theory how to raise the cutting rpm. Say at 100rpm the windmill makes 8volt, if you have the transformer setup it starts at say 5volt. Then when you add the two with the mill at 100rpm it starts charging the battery 13 volt, instead of 160rpm without the pulsing

I'm working on a new design, from a different book, which the theory says will work but in practice might not(low voltage and amps), which is the idea about pulsed dc. When I get further into the build and can post some outputs , it might give you some more information.

Cheers
 
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