95
modifications
Modifications
→Design
===Hub===
[[Fichier:Hub.png|Micro-éolienne|200px|right]]
The hub has two main functions: to assure the blades position avoiding any rotation or unhooking of those, to transmit the torque to the generator. In our project, the different blades foots placed together form a cylinder. This one is then covered by the two parts of the hub. We maintain the assembly fixed with nuts and bolts. The first part, the nose, possesses also an aerodynamic function. The second part is resistant and fully printed because it transmits the torque to the generator. The assembly between the hub and the generator uses a key. A compression screw was added to press the key and maintain the rotor in place on the generator shaft.
===Nacelle===
[[Fichier:Nacel.png|Micro-éolienne|300px|right]]
The main function of the nacelle is to maintain the generator in position and to maintain all the assembly stable on the top of the tower. The tail fin is also fixed on the nacelle. It will orientate the hub en front of the wind. We decided to use the 3D printing to create an original shape. Indeed, 3D printing allows the design of pieces that would be extremely expensive to create with classic manufacturing means. The shape we designed uses the Venturi effect to create an air flux on the surface or the generator. It permits to cool it more efficiently and so to increase the general efficiency. The ABS is a thermoplastic and doesn't resist at high temperatures. In our project, the uses of this type of cooling turned out to be necessary. The assembly of the nacelle is shown on the hereby picture.
==Manufacturing==
