FINITE-ELEMENT ANALYSIS OF A SYNCHRONOUS PERMANENT-MAGNET MICROMOTOR THROUGH AXISYMMETRICAL AND TRANSVERSE PLANAR SIMULATIONS

The aim of this work is to present and discuss an original way to anal yze a synchronous permanent magnet micro-motor (SPMM) for design purpo ses. The analysis of the magnetic field distribution in the motor, who se geometry would require a 3D modeling, is instead carried out with t he aid of two 2D finite-element (FE) simulations: one axisymmetric and one on the cross-section or transverse plane. To validate the suitabi lity of the proposed method for torque computation, a 3D-field solutio n is also presented. Computed results of distribution of magnetic indu ction, as well as the torque developed by the motor in both 2D and 3D simulations, have shown good agreement with measurements in a prototyp e machine.