الفهرس 
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Abstract
In this thesis, full analytical investigation of thr performance of the three phase brushless DC motors when fed from either apure DC source or a photovoltaic array has been conducted.
Analytical expressions for line and phase values of current and voltage of the brushless DC BLDC motors are derived for both cases. The derivation has been extended to include, in addition to the currents and voltages, the motor speed, rotor position angle and torque.
Also, performance of a photovoltaic PV array and a method to determine its parameters has been presented.
The performence of diiferent types of conventional DC motors when fed from a PV array has been investigated. This has been accomplished for several loading conditions.
To obtain the different performance characteristics of PV array, PV array/ DC motor system, BLDC motors and PV array/BLDC motor system. Matlab programming software package is used. These performance characteristics are obtained, also, by the simulation of the systems using the MATLAB/SIMULINK software package.