DI Axel Walter; PD Dr.Ing.habil. Andreas Möckel, TU Ilmenau

In many applications, the minimization of the cogging torque is one of the most important optimization goals. Here, what counts most is to avoid noise and vibration. The very complex development of the cogging torque is directly represented by means of the numerical field calculation of the motor. For this, it is essential to carry out a lot of calculations to include the resulting torque in every possible position of the rotor. Considerable periods of calculation result from this high numerical expenditure, which leads to delay in processes of designing or optimizing. Thus, fast methods are necessary to determine the cogging torque with adequate accuracy. For arrangements with permanent-magnet excitation, an analytical approach is introduced that differs from existing solutions by considering the influence excerted by saturation effects in the heads of the teeth on the air gap field.