Radial low-RPM Halbach array PM Generator with serpentine coils.

thingiverse

This generator is designed for our converter high-potential energy into electricity. Also, it can be applied in wind or hydro-generators. The Halbach array allows the most efficient use of the energy of the magnetic field of the permanent magnets. There's no need to put the iron disk. The magnetic field at the outer side of the rotor is much stronger than on the inside. The radial design of the magnets and windings allows for a uniform magnetic field and increases the efficiency of the winding. This type of winding is more efficient than axial in this case. A serpentine coil is the best compared to the three-phase winding, but it has a more difficult assembly process. However, it's worth it. You can use any plastic materials for printing details for this generator. But for more powerful generators, you need a solid filament. Otherwise, the rotor can be deformed by a powerful magnet. 3D printing and combining radial Halbach array PM and serpentine coil allow you to build highly efficient generators -like radial and linear. It's possible to make a generator for a wide range of capacities and sizes - from generators to the Internet of Things (up to 1-2W) to 5-10 kW generators for local installations. 3D printing can reduce the time and cost of construction of the entire device. Printer: Prusa i3 Infill: 0.15 Material ABS Shaft 5mm, bearing 625zz. PM 15X5X5 mm NdFeB N42 Magnets: https://www.indigoinstruments.com