The permanent magnet synchronous motor (PMSM) used in wind turbine and electric vehicle situations usually has to directly track the torque command issued by the main control system. As a matter of fact

however

no torque test components such as a torque sensor is available in an actual system. So the exact acquisition of the observed torque is of utmost importance for the torque control system. To enhance the torque observer performance

this paper proposes a real-time stator flux linkage observation method based on a minimum extended flux linkage observer

through which the stator flux linkage and the electrical torque are calculated. The proposed stator flux linkage observer is not only free from the flaws of the traditional pure integral strategy

such as saturation

phase shift

amplitude deviation

and so on

but also

as a pure integral strategy

is robust for parameter deviation

namely

the precision of the observed torque is basically unaffected by the direct- and quadrature- axis inductance and the rotor flux linkage. Simulations and experiments on an 11 kW PMSM have validated the performance of the proposed method.