Modeling and Design of Axial-Flux Permanent Magnet Machines: A New Approach

In this paper, a new analytic approach to the calculation of magnetic field in a slot-less, two-rotor axial-flux permanent magnet machine is presented. The analytic modeling is based on calculation of scalar and vector magnetic potentials. The magnet is modeled by magnetization vector and a two dimensional current sheet represents the armature winding. The effects of armature reaction and the harmonics of field are also considered. The simulation of magnetic field by analytic model is compared with the 2-D finite element analysis. The analytic model predicts the magnetic field within % 5 compared to FEA results. Ultimately, by using the analytic model in a Genetic Algorithm method, an optimal design of an axial-flux permanent magnet machine is presented.