Wind Power Project
This page will demonstrate how to take advantage of wind power.
The first thing I need to consider is the type of motor we want to use. For wind power I wanted a simple DC brushed motor so I looked around my house and found exactly that, a PC fan case. The fan already came in a housing so it was perfect. I wanted to see what kind of open voltage readings I can get so I attached a multimeter to the prongs and blew my girlfriends blow dryer at it (finally got some meaningful use out of it).
I got a range of about 1V- 6V; however, I don’t think the wind will ever blow that fast at the end so I will assume it won’t over 4V.
Now I have to check the voltage while a load is connected. Here is a picture that demonstrates this, in a more controlled test. I changed the distance from the blower so it will mimic a breeze in the windy city of chicago. I also have a multimeter measuring current in series with the loop. Here is the chart of different loads.
Through testing different resistances, we found that the highest wattage produced is between 220 ohms and 440 ohms. This was done so we can find the highest amount of power with a given resistance (load). We can look at the powering part as a load which can be a LED, a battery charger, etc. For instance I am powering an LED from the picture to the right. Furthermore, when constructing a circuit to harness this power, the circuit should have that resistance value to achieve maximum power.
In conclusion, this experiment showed a simple way to harness wind power. The experiment also showed how to maximize the wattage of the given source. The max observed power this device can output is around 20mW which really limits what can be done. A solution would be to just have a bigger fan and motor or put multiple in series/ parallel to obtain higher wattage.