This instructable shows a demonstration of a single-phase asynchronous motor (induction motor).
I made some pieces with a metal lathe, but you can customize the implementation using a simple drill and recycled materials (metal, plastic, wood, cardboard).
Step 1: Materials and tools
2 or 3 x relays (I use only the 12V coils)
1 x capacitor 4.7µF
1 x used bicycle dynamo (I need only the magnet)
1 x transformer 110 or 230V / 12V
Some pieces of metal (aluminum tube, brass rod)
A few pieces of plastic
A few pieces of epoxy copper plates for printed circuit boards (PCB)
Drill (preferably drill press)
Possibly a little lathe
Saw, file, soldering iron, glue
Step 2: AC generator
I mounted the magnet on an axis. It runs horizontally in front of a relay coil.
A LED is connected to the coil.
Turning the magnet, a current flows through the LED. The LED lights.
Step 3: Rotating magnetic field
I made a rotor from an aluminum tube 30mm diameter. I glued a plastic disk on one side of the cylinder. In the middle of the disc, a piece of brass used as a pivot. It rests on a steel needle (a sharp nail). The rotor can rotate almost without friction.
The magnet is placed in front of the rotor, with a gap of about 1mm.
Note that the rotor is non-magnetic metal (aluminium). It's the induced current which bring rotation.
Step 4: AC power
This produces an alternative induced current in the secondary coil.