Electromagnetic Design and Analysis of Axial Flux Permanent Magnet Generator With Unequal-Width PCB Winding

For the design of printed circuit board (PCB) winding, it is necessary to take into account the requirements of electromagnetic and manufacture technology of PCB winding, which directly affect the output power of the machine. In this paper, for axial flux permanent magnet generator (AFPMG) of a small wind power system, the unequal-width (UEW) winding is proposed for the aim of improving the output power of the generator. The design ideas and methods of unequal-width (UEW) winding are proposed in combination with manufacture technology of the PCB. The finite element analysis (FEA) model of machine is built. The analytical formulas of electromotive force (EMF) and winding loss are derived. Though the comparisons between reactance and impedance of PCB winding, the analytical formula of output power is simplified. These characteristics of the generator with traditional equal-width(EW) winding and proposed UEW winding are analyzed and compared in detail by FEA and analytical calculation. The result shows that the output power of the generator with UEW winding is improved largely. Finally, the validity of the FEA model and analysis method is verified by experiment of prototype machine, which provides the reference for the design of AFPMG with PCB winding.