Numerical modeling using 2D FEM for a low power DC brushless motor

The paper presents a numerical and experimental study of an electronic switched DC motor with permanent magnets used to power fans in household appliances. The starting point is the symmetry and periodicity of the stator´s and rotor´s magnetic cores which lead to the development of a 2D numeric model for the magnetic field. This analysis establishes the overall motor performance and design optimization in order to reduce its volume and lower the cogging torque. The 2D numerical models developed based on finite element methods are studied in transient regime and the problems generated by the computation of the magnetic field in conjunction with the electric circuit are discussed.