د.مصطفى عبدالسلام الفلانى2026-10-122026-10-12https://dspace.academy.edu.ly/handle/123456789/2615The objective of the project was to analyze and compare the performance of the motor operating as a BLDC and synchronous motor. To do this, mathematical models for both operation modes (that allowed us to analyze the performance in dynamic conditions) were proposed. To analyze the motors performance in steady-state conditions, simpler motor models were proposed and calculations carried out. The results obtained from the two types of models were compared. The motor was supplied from a 3-phase inverter (controlled by PI controller) which operated in MATLAB/SIMULINK environment . This allowed us to control the motor speed in both types of models ( BLDC and PMSM ), and the results obtained from the two types of models were compared.The performance of a three-phase permanent magnet (PM) motor operating as a synchronous motor (PMSM) and brushless DC (BLDC) motor is discussed. The PM motor, when operating as a synchronous machine, is supplied with constant frequency, meaning constant rotor speed operation. When operating as a BLDC motor, the supply frequency changes according to the actual rotor speed. It means that the speed signal is fed back to the controller, which generates the appropriate frequency to supply the stator winding. This means that the BLDC motor cannot operate without a position sensor.Simulation of Dynamic and Transient Performance