Model reference adaptive controller-based speed and q-axis inductance estimation for Permanent Magnet Synchronous Motor drive by utilizing reactive power

This paper deals with the parameters of Permanent Magnet Synchronous Motor (PMSM) i.e. speed (ω
r
), and q-axis inductance (L
q
) is to be estimated by using Reactive power based Model Reference adaptive Controller (MRAC). To improve the performance of speed sensor less permanent magnet synchronous motor drives, especially at low speeds by identifying stator resistance together with speed. Several speed estimation methods for sensor less PMSM drives have been proposed but the Performance is not satisfactory at low speed. Model-based speed and stator resistance estimators are the most common schemes used in the literature. The proposed technique is completely Independent of stator resistance (R
s
) and is less parameter sensitive, as the estimation-algorithm is only dependent on q-axis stator inductance (L
q
). Also, the method requires less computational effort as the simplified expressions are used in the MRAS. In this proposed scheme sensor less technique is used. The vector control technique is also used for the control the PMSM position and speed sensor. MATLAB/ simulink based simulation is discussed.