Modeling and experimental verification of torque transients in interior permanent magnet synchronous motors by including harmonics in d- and q-axes flux linkages

This paper develops an advanced analytical model for the interior permanent magnet synchronous motor to represent the average and transient components of the electromagnetic torque. The conventional flux linkage model is extended to include harmonics in dq-reference frame. Furthermore, the effects of cross-magnetization and saturation on these components are analyzed. The electromagnetic torque derived from the proposed flux model is utilized to compute the average and pulsating components of the torque. Experiments and finite element analysis have been carried out on interior permanent magnet synchronous motor with concentrated and distributed winding to validate the proposed model under different load conditions.