Accurate modeling of PMSM for differential mode current and differential torque calculation

In this paper an accurate modeling of permanent magnet synchronous motor that is suitable for high frequency differential mode calculation is proposed. The model takes into consideration the core losses and the two resonance responses that occurred during the experimental results. The model is suitable for calculation of torque ripple contribution due to flow of the differential current in motor winding. The experimental measurements show that the motor differential mode stray capacitances are functions of rotor position. The simulation results of the proposed differential mode circuits together with the experimental results show that the level of the differential mode noise currents is of significant value that can not be ignored. However, the flow of some of this differential mode current in the motor stator windings has small contribution of the torque ripple.