WinDIY's hub - Oh my god mechanics

A project log for WinDIY - HAWT Wind turbine

Mostly 3D printed HAWT windturbine incl. 3D printed disk-generator and brake system.

FabFab 06/11/2020 at 11:370 Comments

The hub for WinDIY initially gave me a real headache. As a pretty central part, the hub is super important and should be as stable as possible, but light and symmetrical at the same time (without an imbalance or something similar).

In addition, it has to absorb the force of the wind in the axial direction, the centrifugal force of the rotating blades and of course the rotation of the blades should be as smooth as possible. Obviously, it must also bear the static weight of the wings.

In addition, I had also considered to include a mechanism to adjust the wing's angle of attack (during rotation). This principle is also known from large wind turbines.

This has two advantages. 

When high winds occur, the angle of attack of the blades can be adjusted so that the blades are aligned unfavorable to the "true wind". The turbine does not stop rotating, but will definitely lose speed of rotation. :)

Well, long story short: The hub has to enable the control of the blade angle while the hub itself rotates.

I have worked on this problem for a long time. You can see the result in the video. :)