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This paper presents the vector control inverter (VCI) for a photovoltaic (PV) motor drive system implemented by a single chip DSP controller ADMC331, using a current control voltage source inverter (CC-VSI), to control the motor drive system. The voltage (Vpv) and current (Ipv) values of PV at the maximum power point (MPP), which varies with different levels of light intensity, are used as commands to control both amplitude and frequency of flux (Ids) and torque (Iqs) producing current component of the stator current. The results of experiments show the response of the vector control drive system, which changes with light conditions, and is expressed in the line-current and speed of the motor. The proposed system can be applied to a PV water pumping system, which is a square load. The capacity of the PV water pump will be directly related to the motor's speed change, which changes with the MPP value of the PV for varying levels of insolation.