Real-time control of PMSM motor drive based MRAS-STC technique

This paper deals with a real-time evaluation of a sensorless model reference adaptive system- supertwisting control (MRAS-STC) applied to the Permanent magnet synchronous machine (PMSM). The proposed topology diagram is divided into two parts. First, a STC approach is applied to operate the system in safe mode by minimizing the number of gains which are strongly dependent on machine parameters. These latter change with temperature compared to the first order sliding mode. The STC technique lends itself well to the control of an uncertain system and in the presence of external disturbances which may affect it. This technique is developed to achieve a desired speed in the presence of parametric uncertainties and load disturbance. Its formulation reduces chattering. The second part proposes a model of MRAS to estimate the speed of the rotor and eliminate the sensor which is the weakest link in the system. The evaluation of the proposed control process is carried out using a dSPACE1104 card. Experimental results obtained give a good functioning of the whole system, where the proposed MRAS-STC provides fast and high performance, while the system manages to perfectly follow the speed profile, under load disturbances and tolerable uncertainties, while respecting its dynamics under load.