Simulation of magnetic field distribution of opposite-poles single-disc Permanent Magnet Rotor

The study development regarding Axial Flux Permanent Magnet Generator (AFPMG) has been increasingly interesting, since its construction is simple and easy to construct; permanent magnet type NdFeB has high density, available everywhere and relatively low cost; without using brushes and slip ring, thus the maintenance cost can be low, long usage duration, direct drive connection. These will affect in the increasing efficiency and reliability. One of the problems which remain to be the main issue in AFPMG is rotor disc dimension influenced by distance between magnets in rotor disc. This paper discussed magnetic field distribution simulation between permanent magnet NdFeB type N40 with diameter dimension 40 mm and 10 m in height on different pole rotor disc in order to obtain the minimum disc dimension with maximum magnetic flux distribution. Simulation was performed by Finite Element Method Magnetics (FEMM). The simulation result was presented in the form of magnetic field distribution geometry on two permanent magnets inside rotor disc. It showed that the magnetic field strength in the midpoint between different pole single rotor was very low (44 mT) on the distance of 25 mm.