Design and analysis of an axial-field permanent magnet generator with multiple stators and rotors

An innovative axial-field permanent magnet generator (AFPMG) with multiple stators and double rotors is designed and the structural and electromagnetic features are investigated. This generator has two permanent magnet (PM) rotors at the left - and right-hand sides of a double-sided stator. In order to get benefit from the magnetic flux produced at the outer parts of the generator, two other stators are also positioned near the PM rotors. AFPMG is mainly considered for wind energy applications and it has three phases. The electromagnetic features are characterized by finite element method (FEM) and the transient solutions are analyzed based on a proposed equivalent magnetic circuit model using three phases of induced emf at the coils having two different geometries. New AFPMG generates 80V at each phase for a constant velocity of 125 rpm and it has an efficient dynamics with low cogging torque values.