Modeling and experimental verification of the performance of a skew mounted permanent magnet brushless DC motor drive with parameters computed from 3D-FE magnetic field solutions

Abstract

This paper contains a comparison between actual laboratory-measured performance of a brushless dc motor drive system, with skewed permanent magnet mounts on its rotor, and two computer-simulated motor drive system performance characteristics. These simulated motor drive system performance results were once obtained using motor parameters computed from rigorous three dimensional-finite element (3D-FE) magnetic field solutions detailed in two companion papers, and once obtained using motor parameters from more conventional 2D-FE magnetic field solutions. The comparison demonstrates that 3D-FE based motor parameters lead to drive system performance simulations which are much closer to test results for this type of brushless dc drives with skewed permanent magnet mounts. Torque ripples computed from 3D-FE based and 2D-FE based motor parameters are also included. The results clearly show advantages to basing the drive system simulations on 3D-FE computed motor parameters.