Robust Position And Speed Estimation Algorithm For Permanent Magnet Synchronous Drives
Résumé
This paper deals with the design of sliding mode controllers (SMC) for a vectorcontrolled of permanent magnet synchronous motor (PMSM). The advantages of the sliding mode controller are disturbance rejection, strong robustness and simple implementation. Speed and torque control of permanent magnet synchronous motors are usually attained by the application of position and speed sensors. However, speed and position sensors require the additional mounting space, reduce the reliability in harsh environments and increase the cost of motor. Many studies have been performed for the elimination of speed and position sensors. Our proposed control strategy is based on an accurate Extended Kalman Filter (EKF) observer which estimates speed, position, rotor - fixed current ds qs i , i and load torque. The investigations show that the EKF is capable of tracking the actual rotor speed, position and load torque provided that the elements of the covariance matrices are properly selected. Moreover, the performance of the EKF is satisfactory even in the presence of noise or when there are variations in permanent magnet synchronous motor load.
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