Speed Estimation by Using EKF Techniques for Sensor-Less DTC of PMSM with Load Torque Observer


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Abstract


This paper proposes a Direct Torque Control (DTC) of a Permanent Magnet Synchronous Motor (PMSM) without mechanical speed and position sensors. These later are estimated by using the Extended Kalman Filter (EKF) only by measurement of the stator line voltages and currents. Moreover, DTC uses no current controller and no motor parameters other than the stator resistance, which yields a faster torque response and lower parameter dependence than with others motor control techniques. The Kalman filter is an observer for linear and non-linear systems. Also, due to an angle modification scheme with error tracking, the Sensor-less drive system is robust to parameter variations. A load torque can also be estimated by using Luenberger Observer. A simulation model is developed in MATLAB/SIMULINK and is used to verify the basic operation (performance) of the Sensor-less DTC of PMSM
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Keywords


Permanent Magnet Synchronous Motor (PMSM); Direct Torque Control (DTC); Extended Kalman Filter (EKF); Sensor-Less Drive; Position And Speed Estimation; Load Torque; Lurnberger Observer

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References


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