1. Professor, Laboratory of Electro-Mechanical Systems, National Engineering School of Sfax (Enis), Univ. of Sfax, km 4 Rte de la Soukra, Sfax 3038, Tunisia (corresponding author).
2. Doctor, Laboratory of Electro-Mechanical Systems, National Engineering School of Sfax (Enis), Univ. of Sfax, km 4 Rte de la Soukra, Sfax 3038, Tunisia.
3. Professor, Laboratory of Electro-Mechanical Systems, National Engineering School of Sfax (Enis), Univ. of Sfax, km 4 Rte de la Soukra, Sfax 3038, Tunisia.