May 11, 2018
Description
*** Please don't try to use this motor for anything practical! It is really weak :D ***
You are hearby challenged to make an electric motor! :D
UPDATE: I added a inner core without any iron for the electromagnet, there is no point to use a metalcore if the electromagnet cant overcome the attraction anyway. For an electromagnet with air core, the internet suggests a tall and thin windig of the wire since the "magnetic field" cant travel along the length of an air core. Thas why I have a very thin gap for the wire. This setup actually used a bit less power. 0.6- 0.8A instead of 0.9A. The air-core electcromagnets truly is very weak, so be sure to make a close design for your parts.
Motive
As a kid, I discovered an electric motor entirely made in acrylic glass, It was on display on a small table in a closed room in a friends family house. It was a large transparent disk with metalfoil attached to it - wires here and there. This must have been around 1975-1980, I was probably 7 years old? My family spent a short holiday in Norway, Oslo, and the motor I saw must have been made by Nils Berner for a class, if I remember correctly? (Nils later became an inventor)
I was so impressed, acrylic glass, this was the future. Totally awesome.
Ever since I saw that acrylic-glas-motor I wanted to make an electric motor myself. So now I finally made it. It was surprisingly easy.
Some info on the AIR-core - construction:
-insulated copperwire, 0.25mm, 30 turns on each
-1 bearing, 13mm x 4mm ( outer x inner)
Some info on the METAL-core - construction:
-insulated copperwire, 0.25mm, 100 turns on each bolt (could probably be thicker wire and fewer turns?)
-6 bolts and nuts. 3M(mm) 16mm long (could try to anneal the metal?)
-1 bearing, 13mm x 4mm ( outer x inner)
Some info on the Outer-ring construction:
-10 neodynium magnets, cylindrical 5mmx5mm
-1 long bolt 4M, 38mm long, 1 nut to adjust height of the outer ring of magnets.
Some info on control
-arduino uno
-adafruit motorshield (4 h-bridges)
-1 trimpot 10K
I ran the motor with 7 volt and 0.9 A (x 3). (The adafruit motorshield cant handle more than 3A in total, and the wires got really hot if I used any more power)
Arduino code
The Arduino code for the Adafruit motorshield v2.0 is found here.
https://github.com/LinusJarbo/Arduino/blob/master/ElectricMotor/ElectricMotor.ino
License:
Creative Commons - Attribution
linusjarbo
