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Mohammedia, Morocco

Mahmoudi H.,Powers Electronics Laboratory | Langrioui A.,Powers Electronics Laboratory
Journal of Theoretical and Applied Information Technology | Year: 2011

In this paper, a robust flux-weakening control scheme of PM synchronous machines is studied. Based on a novel current control concept, a speed/flux-weakening controller (SFWC) is proposed for the flux weakening control of PMSM. Comprehensive analysis is conducted on the operations of PMSM controlled by SFWC in the flux-weakening region. Small-signal method is used to investigate the flux and torque controllability of SFWC. The current vector trajectories are modeled and illustrated in the rotor reference frame, with special attention to SPM motors. Efficiency-optimized design is performed on the selection of a newly introduced voltage constant. The Simulation results are provided to demonstrate the feasibility of the proposed control concept. © 2005 - 2011 JATIT & LLS. All rights reserved. Source


Lagrioui A.,Powers Electronics Laboratory | Mahmoudi H.,Powers Electronics Laboratory
Journal of Theoretical and Applied Information Technology | Year: 2011

In this paper, a nonlinear adaptive speed controller for a permanent magnet synchronous motor (PMSM) based on a newly developed adaptive backstepping approach is presented. The exact, input-output feedback linearization control law is first introduced without any uncertainties in the system. However, in real applications, the parameter uncertainties such as the stator resistance and the rotor flux linquage and load torque disturbance have to be considered. In this case, the exact input-output feedback linearization approach is not very effective, because it is based on the exact cancellation of the nonlinearity. To compensate the uncertainties and the load torque disturbance, the input-output feedback linearization approach is first used to compensate the nonlinearities in the nominal system. Then, nonlinear adaptive backstepping control law and parameter uncertainties, and load torque disturbance adaptation laws, are derived systematically by using adaptive backstepping technique. The simulation results clearly show that the proposed adaptive scheme can track the speed reference s the signal generated by a reference model, successfully, and that scheme is robust to the parameter uncertainties and load torque disturbance. © 2005 - 2011 JATIT & LLS. All rights reserved. Source


Lagrioui A.,Powers Electronics Laboratory | Mahmoudi H.,Powers Electronics Laboratory | Boussoufi B.,Powers Electronics Laboratory
Journal of Theoretical and Applied Information Technology | Year: 2011

This paper presents a discreet linear predictive control (DLPC). This strategy is applied to permanent magnet synchronous motor (PMSM) for monitoring the speed at trajectory and rejection of disturbance. The predictive control law is obtained by using a cost function and a Taylor series to perform prediction in a finite horizon. No information on the external disturbances and uncertainty parameters are necessary to ensure the robustness of the proposed strategy. Furthermore, in order to maintain the current phase within the saturation we used a cascade structure with a block anti-windup. Simulation results demonstrated the stability, robustness and effectiveness of control strategy proposed for the trajectory tracking and disturbance rejection of torque. © 2005 - 2011 JATIT & LLS. All rights reserved. Source

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