Torque Feedback MTPA Control using an Estimated Torque Approximation Equation

The operation of interior permanent magnet synchronous motors (IPMSMs) can deviate from the optimal point for vector control to magnetic saturation of inductance and variations in the magnet flux caused by changes in the magnet temperature. Torque feedback maximum torque per ampere (MTPA) control, which is known for its resilience to parameter fluctuations. This control method requires accurate torque estimation and MTPA angle estimation. However, conventional methods decreased estimation accuracy inductance or magnet flux a method to enhance the accuracy of these estimations by combining torque approximation equations derived from real motor drives. The accuracy of the proposed method in estimating the torque and MTPA angle, as well as its performance under steady-state torque control and transient conditions, validated.