CHAOS CONTROL IN PERMANENT MAGNET SYNCHRONOUS MOTOR BY SLIDING MODEL CONTROLLER WITH LYAPUNOV OBSERVER UNDER UNKNOWN INPUTS - Hamidzadeh, Seyed Mohamad; Aziz, Amiral; Mohamed, Mohamad Afendee; Vaidyanathan, Sundarapandian; Johansyah, Muhamad Deni (BAREKENG: Jurnal Ilmu Matematika dan Terapan, 2025)