Coreless Dual Rotor Axial Flux Permanent Magnet Generator For Portable Applications

This paper reports on the effects of a dual rotor configuration in an axial flux permanent magnet (AFPM) generator that uses thin copper-clad laminate as the coils for high power density packing. The investigation also examines how the strength of the magnetic field is affected by varying the air gap. The dual rotor generator presented in this work produced 116.5 mW for a coil design (two layers) with eight pole pairs and a 3 mm air gap spinning at 19,600 rpm. Results show that power output increases on average by a factor of 3.0 when adding a second rotor.