1. Styro EF 152 Windmill Project Jake Philpott Kaara Anderson Kevin
Stilwell
Tiffany
Blevins

2. Device Design
Generator – Rare earth magnets attached to paint rollers free to rotate, coil of wire surrounding
Styrofoam windmill wheel much larger in circumfrence, sturdy wooden blades to catch wind
Fabric “belt” to rotate with blades and spin magnets within wire coil
Mounted on wooden platform

3. Electrical Aspects Rare earth magnets ordered online, $8.99
Chose to increase the number of coils to increase magnetic flux; sacrificed increased resistance from smaller wire
Magnets rotate on paint roller to create electricity

4. Mechanical Aspects
Larger wheel for windmill allows many more rotations of smaller generator wheel per turn of windmill blades
Chose to connect device using fabric
Does not strain device
Has good grip

5. Efficiency Calculations
(.029 volts)^2 / 260 ohms = × 10-5 watts actual
% efficent
10 inch radius = m
P = 0.5 x rho x A x V3
Pi*(.254^2) m^2 * kg/m3 * 1.7 m/s * .5 = watts theoretical

6. Design Process and Problems
Not much previous knowledge of generators, but needed to incorporate wire and magnets. Problem arose when first magnets broke.
Had to determine lightweight, stiff material for wings, and how to attach to an easily rotating object.
Had to connect generator to windmill blades well enough to rotate but not so tightly that they created a strain on the windmill rotator.
Design completely constructed and functioning, then after a period of storage had a couple minor failures. Repaired cable strip and began taking it off the windmill when not in use.

7. Conclusions
Wind power efficiency can be increased by decreasing problems not only in each component, but how they connect
Storage of devices can cause strain on them and decrease performance (fabric strand)
Materials may be available more cheaply online
Although the useful energy from coal-burning steam plants is much greater, more “green” oriented power options are not necessarily useless