I'm currently working on creating a portable wind turbine as a mock-up-project. On the net I've found a blog containing fitting PCB and parts print; but what I'm missing is the fundamental knowledge in how I'm supposed to demonstrate the schedule, backed up with equations and calculations.

ie laws in electronic (Im familiar with kirchoff and Ohm), mechanical laws etc

Any input you might come with is greatly appriciated! (If you want to take a look at the data and explain it back in laymans terms)

Link to blog (http://blogs.eciems.com/5v-from-portable-wind-turbine/)

The blog don't tell what kind of air velocity is needed and RPM for the DC motor.

Pardon my english, grammar and spelling might be off since it isnt my native language!

//Newbie energy-engineer

 

What do you intend to power with your project?

 

What do you intend to power with your project?

In all of my text I missed to state what's supposed to be charged... Sorry!

Lets say a modern mobile phone (android) is to be charged through the USB-port.

 

OK. Secondly, where are you siting you wind turbine? You will need to do some research/measurement on wind speed in that location. Once you know the wind speed you can look to match that with a suitable generator, as the generator in question will only produce power proportional to the wind speed (i.e. how fast it can spin the rotor).

Assuming you are powering a smartphone (say 5V 1A) you need a generator capable of at least 5 Watts, at its maximum rotational speed/torque. You should be able to get small DC motors off ebay that should accomodate the project, assuming your location is windy enough.

 

OK. Secondly, where are you siting you wind turbine? You will need to do some research/measurement on wind speed in that location. Once you know the wind speed you can look to match that with a suitable generator, as the generator in question will only produce power proportional to the wind speed (i.e. how fast it can spin the rotor).

Assuming you are powering a smartphone (say 5V 1A) you need a generator capable of at least 5 Watts, at its maximum rotational speed/torque. You should be able to get small DC motors off ebay that should accomodate the project, assuming your location is windy enough.

It will be used at locations measured up to 10,8 - 13,8 m/s velocity

Interesting, I will check up on suitable generators and their manufacturing information (hoping they will provide with data for rpm/spin needed)
Thanks for the assistance!

 

as the generator in question will only produce power proportional to the wind speed

Not quite.
The angular speed of a wind turbine is roughly proportional to the cube of the wind speed.
The generated voltage V will be roughly proportional to the angular speed of the generator.
The electrical power consumed by a load of resistance R is V^2 / R.

 

Interesting, I will check up on suitable generators and their manufacturing information (hoping they will provide with data for rpm/spin needed)
Thanks for the assistance!

That's a good start, now the hard work starts. I assume you are designing the whole thing from scratch? Before you buy a DC motor (which you will use as the generator) you should do a few calculations. When designing your rotor blades you will need to know how big to make them to meet the angular velocity required by the motor (usually stated in RPM). Using your linear velocity values you should be able to determine the necessary diameter. This will be the meat and potatoes of the project.

EDIT:
Sorry Alec_t, you are right. Thanks for the correction!