The analyses the axial flux permanent magnet generator (AFPMG) dual stator single rotor structure. For the valuation of analytical results, the electromagnetic design of AFPMG is done and compared with various air gaps to flux density and power density. In the axial flux design air gap to flux density is improvement for different air gap are analyzed. This machine is gauge with certain criteria such as the cost, the copper loss, the eddy current losses and the flux density.