Foamy VAWT Stator

Construction details of the stator and performance data on the Foamy VAWT generator.

Note: be sure to clean and sand the metal parts before applying epoxy; it will make a much better joint.

Category:

Science & Technology

Tags:

• VAWT
• diy
• stator
• foamy
• vertical
• axis
• wind
• turbine
• generator
• pma
• alternative
• energy

[joe18370]

so what is she puttin out,i am getting into this field now,building my own stators,good video

[Caleb6543]

@joe18370 I only got a few watts out of it, but that is more because my turbine couldn't put out more than that. I think it would be good for about 20 watts.

[drewartturbine]

next question is that you are using 2 sets of windings, offset, for equidistant spacing, correct? So you have 4 wires coming out of your stator, do you series them? or rectify them separately? if each set is producing 3ph, what's the best way of wiring that to your rectifier?

[Caleb6543]

@drewartturbine There are three coils with 6 wires coming out. Then I connected the tails of the coils (after checking them on an oscilloscope for correct phase angle) to for a "wye" configuration. After that, the three remaining wires go into a rectifier.

[drewartturbine]

You are using 8 poles, and an equally divisible number of legs in your coils. I was understanding that best design is a 4 mag pole/3 leg ratio? This is what Hugh P. designs follow, but is it just for 3 ph? I have read a number of sources some say it's to prevent cogging, others that it's to do with some esoteric 3ph geometry, others that it's to make each coil set have an approaching magnet, an centred mag, and a departing mag, so that the waveform produced by the coils set is "flatter".

[Caleb6543]

@drewartturbine The "coils" I'm using overlap each other to get the phasing. That way, it is possible to make the gap between the magnets smaller and increase the field strength. Although, I really didn't make good use of that feature with this turbine.

[definitionofis]

@definitionofis I learned later, the current is sq root of 3 = 1.73 times more for 3-phase versus 1-phase. So resistance is 1/1.73 = 58% and that is like using 42% less wire (not 29% less). I have seen serpentine versions with overlapping windings, far from magnets, then coils might be better. I wonder if that inefficiency loses the benefit, too. (I'm just thinking out loud. I have no experience.)

[superbungabunga]

made out of card board awesome man

[drewartturbine]

oops, just drew it out on paper and see, in my case it's the same as the mag array, 16 poles gets 16 legs. GREAT! Thanks

[drewartturbine]

Very Helpful! Thanks, I've been trying to understand the difference, so in a 16 pole rotor like I have, how many legs would you use?

[Caleb6543]

@drewartturbine You are correct. Typically, there are 4 magnets to 3 coils to generate the three phases. However, this type of coil relies on placing the coils "120 degrees" apart from one another to get the three phases.