Sensor less Vector control of PMSM using a blind system identification approach based on extended kalman filter algorithm

This paper presents the estimation of rotor position and speed of a permanent magnet synchronous motor (PMSM) using only the measurements of three phase stator currents. A sensor less PI speed control of PMSM is developed in Simulink/Matlab environment using this blind estimation technique. The paper proposes the modeling of the dynamic equations of the permanent magnet synchronous motor (PMSM) to describe the dynamics in terms of direct axis current and voltage, quadarture axis current and voltage, rotor position and synchronous speed. The present work uses only the sensed line currents as measurements thus following a blind system identification approach. Conventional PI controller is used in outer speed loop and in inner current control loop.

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