Torque Error Compensation Algorithm for IPMSM Drives Using a Gopinath Style Stator Flux Linkage Observer

A compensation algorithm targeting torque development from an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. Maximum Torque per Ampere (MTPA) lookup table (LUT) applied for copper loss minimization uses the estimated permanent magnet flux linkage, and torque error occurs because of PM flux linkage variation. In this paper, proposed, a control algorithm is proposed to reduce torque error applying a stator flux linkage observer. Permanent magnet flux linkage estimated using the stator flux linkage observer is applied to the initially developed MTPA-LUT to reduce for the torque error.