TheBackShed.com

Forum Index : Windmills : First try at F and P wind turbine

Author

Message

lmnewey
Newbie

Joined: 02/08/2015
Location: Australia
Posts: 2

Posted: 05:45pm 02 Aug 2015

Copy link to clipboard

Print this post

Hey guys, Just introduce myself first. My names luke i live in brookdale in Western Australia, looking for ways to generate power when i'm out and about in my fourby.

I've looked over this page many times unfortunately i have never had access to a F and P motor until now :)

I was driving along the other day and noticed a washer on the side of the road so i grabbed it. I figured i would try to make a wind turbine. the test unit will most likely be attached to a solar inverter while i get my head around it.

Ive cut the barrel so i can reuse the current bearing housing. i've not re-wired the stator at this stage, at the moment its pushing power off the three phases in to 3 single phase rectifiers which are bridged together. However (my question) when there is load the alternator is hard to turn. Will this improve (i have a 36 pole) if i re-wire the stator to 6x6. rather than the factory wiring??

I really dont understand this stuff, i figure the best way to learn is to do :)

Any help and or suggestions (including reading ;) ) is apreciated

Tinker

Guru

Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 11:40pm 02 Aug 2015

Copy link to clipboard

Print this post

Hi Luke,
So its harder to turn when its loaded? Well, where you think the power for this load is coming from? Its your hand turning the shaft

If that is hard to understand consider this:
You are riding a standard bicycle on a level path.
Then you come to a hill and what happens if you don't change gears - you have to pedal much harder.

The best way to learn is to ask questions, my answers might be deliberately a little cryptic at times, to make you think about what you asked.

Important, a non rewired F&P stator can generate lethal voltages if spun fast.
First job on your list should be to re wire it. Plenty of info how to do that can be found at this site.

Klaus

lmnewey
Newbie

Joined: 02/08/2015
Location: Australia
Posts: 2

Posted: 05:42pm 03 Aug 2015

Copy link to clipboard

Print this post

thanks for the reply, yea I understand that the load is where the power is coming. I should have structured my question a little better :)

I will rewire the stator at 6x6 and see what its like.

Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 02:00am 04 Aug 2015

Copy link to clipboard

Print this post

The load won't change much, just the voltage will be at a safer more useable level.

What the aim is to make the alternator load over a wider rpm range more suitable to the DC voltage you are aiming for.

For example a 24v system you would aim for 70 to 100 rpm before the alternator produced around 24-28v or what we call cutin to the battery, as any lower rpm the turbine would remain in stall and never reach enough power from the wind to break out of stall to produce usable power.

Stall is like driving your car with the handbrake on, yes you can move but not accelerate smoothly.

A turbine needs enough speed to be able to break free of stall and accelerate with wind speed as a dynamic function to the wind speed, too high of a cutin and it spends time spinning without enough rpm to produces not enough voltage to reach cutin, too low of a cutin and the turbine remains in stall and can't reach enough rpm.

Its a balancing act to get the rewiring right to suit the output voltage targeted, in relation to the blades you will be using (please dont say PVC pipe blades) Yes have a go, but dont expect grand results unless you follow the footsteps of others before you here on the forum, there is a wealth of information should you take time to research and ask questions.

Pete.

Sometimes it just works

Print this page

To reply to this topic, you need to log in.