METHOD FOR ESTIMATING THE ELECTOMAGNETIC TORQUE OF A SYNCHRONOUS ELECTRIC MACHINE

The invention concerns a method for estimating the electromagnetic torque of a three-phase synchronous machine with permanent magnets, which involves: measuring the stator phase currents and voltages in a fixed three-phase reference frame linked to the stator, determining these currents and voltages in a rotating two-phase reference frame linked to the rotor as a function of said measurements, determining a stator flux-current model, taking into account saturation functions of the machine in order to consider, within the model, variations of magnetic parameters of the machine caused by the magnetic saturation of the machine, introducing, into the model, state variables describing the parametric uncertainties inherent in the variations in the magnetic parameters of the machine, estimating the state variables by means of an observer based on the stator currents and voltages expressed in the two-phase reference frame, calculating the electromagnetic torque from the stator flux calculated from the estimation of the state variables.