First images of the Social Wind Design. The idea came from the Warming Dress, see former post https://myfablab.wordpress.com/2015/01/21/spine-warming-dress-poster-in-textile-museum-tilburg/
This design called “Social Wind” in a (humorous and friendly) discourse with Warming Dress will become a cooling jacket. The material used for the jacket is fleece, color bright yellow. The basic building shape of the jacket is a trapezoid. Five are used for the conic shape under the middle connection and 5 are used for the top shape. Completing the 3D shape of the jacket are the two shoulder pieces, on top of this jacket shape are two long collors, which run along the neck to the middle, providing stiffness and at the same time pockets for the batteries. The sleeves (inspired by the sleeves used in the Middle Ages which were also used as pockets) are made of two half circles folded open. Theses sleeves fall open to the front and provide space for the small microcontroller (the arduino used for testing the motors will be replaced by a bare bone atmega328 or 5 attiny85 and a central unit with a RF12 transceiver) and the interface for the wearer.
The back has an open strip. Over this strip holders will be attached for 5 small motors that are printed of yellow PLA. The 5 rotors blades on the axis of each motor are leave like.
The motors are so called 3 pahase motors, that means that they can be driven using 3 wires. The script for the motors is fairly simple, the schema presented in this post:
was used. The 5V from the Arduino (in test setup) is probably a little bit too low for these motors, so the script uses a slow start up. For small ventilator blades starting at higher rotation speed wasn’t a problem, but with the bigger blades apparently the moment of inertia was too big. Starting with a slow rotation solved this problem. All the electronics will be gathered in a speical pocket which can be easily removed after discarding the jacket.
Printing the parts between the electronics and the fabric was another detailed process, besides the sewing of the jacket.
The rotor blades are printed as parts, not as a whole shape. The 3D printer used didn’t produce a nice shape if this ventilator was printed as one form. Making 5 blades and sticking these blades in a central axis is more efficient. More details about these 3D prints will be given in another post.
The yellow color of the PLA exactly matched the color of the fleece fabric, the camera is unable to show the exact bright, nearly fluorescent color of the fleece and PLA>
Many details still have to be solved, like the buttons, closing the jacket in front, wiring, designing the interface. There will be 5 ventilators at the back. The ventilator structure in front has to be designed.
Video’s of Social Wind working: