Calculation of parameter interaction in optimization of PMDC motor

The performance of permanent magnet DC motor can be improved by optimization of its magnetic circuit. It can be achieved by means of finite element method in torque calculation and statistical analysis using orthogonal arrays and multi-objective approach. Some uncertainties were avoided using the special constructed orthogonal arrays that enabled the calculation of mutual interactions of chosen parameters. The magnetic field was calculated taking into account non-linear density and effect of current commutation. The electromagnetic torque was determined from magnetic vector potentials of moving conductors. The effect of change for every geometric parameter was particularly calculated. A fast improvement in shapes of the motor magnetic parts was achieved by a very moderate number of electromagnetic field and torque calculations.