Tower of Power EF 152 Final Project November 30, 2009

Who are These People? Austin Lee – Mechanical Corey Stancombe – Mechanical Lanier Loftin – Industrial Adam Bonomo – Industrial

Device Operation and Design Permanent Magnate Generator 1. Fan turns blades 2. Rotates gears at 4:1 ratio 3. Spins duel rotors 4. magnets on rotors induce current in coils 5. Electrical energy drives bulb

Mechanical Aspects Carbon Fiber High-Speed Shaft Geared at 4 to 1 ratio Horizontal axis design Duel magnet rotors Single sandwich stator

Electrical Aspects 8 magnet sandwich design 2x as much magnetic flux transfer through coils 4 coils Estimated to be 300+ turns each Single phase stator Alternating clockwise and counterclockwise winding Wired in series

Efficiency Calculations power= V*I 1.2 watts = 12V*.1A

Issues Coil Problems Winding on bobbins using power drill Alternating direction of coils Correct Coil wiring Balancing Rotors Using properly sized wheel collars to eliminate vibrations Close Tolerance 2mm (hard to achieve)

Summing Things Up Kept under the $40 spending limit Very good voltage being produced Measurements were very important in this project A lot of trial and error, and new LEDs