Abstract : Brushless DC Motors play a significant role in numerous applications. Power density and efficiency are two prominent factors associated with design of these motors. Three phase brushless DC motor is a synchronous permanent magnet motor with rectangular or trapezoidal supply. These motors have a four pole permanent magnet rotors. Stator is a three phase winding supplied by DC voltage. Connecting and disconnecting DC supply depends on the rotor position. For each 30 mechanical degrees of rotor, the supply of windings changes. To detect the position of rotor various methods might be utilized such as hall effect sensor. In this paper a brushless DC Motor is modeled and simulated using MATLAB/SIMULINK. Keywords: Sensorless Control , Dynamic Performance , Hall Effect Sensors , Brushless DC Motor, Brushless Permanent Magnet Motor