Shape Optimization of PMDC Motors Using Orthogonal Arrays

The performance of permanent magnet DC motor can be improved by optimization of its magnetic circuit. That can be achieved by means of finite element method in torque calculation and statistical analysis using orthogonal arrays.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 parametar was particulary calculated. A fast improvement in shapes of the motor magnetic parts was achieved by an appropriate number of field and torque calculations. The optimization results verified this approach.