Estimation of Electrical Angular Position and Load Torque for Sensorless Control Design in Permanent Magnet Synchronous Motor

Abstract

This work proposes the design of an extended state observer to estimate the electrical angular position, angular velocity, and load torque of a surface permanent magnet synchronous motor. We propose a rotating mathematical model (d,q) modified to the observer design when exists an alignment error between the actual and estimated reference frame. From the study of the observer's stability, we propose a methodology to estimate the electrical angular position of the rotor. Finally, we perform high-precision emulations to validate the theoretical results.