I see a problem. The magnetic field has to change N, S, N, S, N, S, across the coil. If you have wire around PVC pipe and the magnet rotates inside the pipe the magnet field is rotating around the coil not across the coil. I have built several generators just for my own education purpose. The magnet field much change from N to S and back to N for it to generate. You can use 1 coil, 2 coils or a dozen coil connected in series or parallel to get either AC or pulsing DC output depending on how it is wired and built.
If for example the blue color is N and the pink color is S and magnet rotates inside a coil there is never a changing magnet field across the coil if the wire is wound in the same direction as the magnet rotation. The wire has to be wound 90 degrees to the magnet rotation. Magnet can also rotate in a U shape metal core with a coil on the metal core. You can spin the magnet in a metal donut with several coils inside the donut.
A picture is worth a 1000 words wish I could upload photo but my good computer crashed and I am using this antique laptop and i am still trying to figure out how this thing works.
You need an amp meter and volt meter connected to a test coil. The faster the magnet spins the higher the voltage goes up to a certain speed where more RPMs makes no difference. Read amps and volts on the meters to learn watts then do the math to determine wire size for a certain voltage amp coil.
A 500Hz generator is much smaller than a 60Hz generator for generators of the same watt rating. When you design and build a generator built it for a certain Hz. If you build a 60Hz 100 watt generator then run it at 400Hz the wire size will be too small extra for power it produces. At 400Hz it could be 250 watts that will be too much for a coil designed to be 100 watts.