Observer-based Sensorless Field oriented control of PMSM motor for EV application

This document described the process and implementation of observer-based field-oriented control of PMSM motor for electrical vehicle application. Numbers of estimation technique has been developed to estimate the position of the motor but most of them depend on stator resistance, inductance, and other motor parameters. The variation of those parameters affects the total estimation process. Among all those estimation processes sliding mode observer (SMO) and luenberger observer (LO) shows the promising estimation efficiency and effect of the variation of the parameters also less. The sensorless observer uses stator voltages and currents as inputs and estimates the electromotive force (emf) from the motor model. Rotor position and speed are further estimated from the estimated emf. As part of this paper position and speed of surface-mounted permanent magnet synchronous machines are estimated by sliding mode observer (SMO) and luenberger observer (LO) for a wide variation of the speed range and the variation of the motor actual speed, torque, position, and variation of current are studied. A close loop sensorless field-oriented control of PMSM motor along with SMO and LO observer implemented in MATLAB/SIMULINK and experimental results also represented in this document.