STARTING CHARACTERISTICS OF INDUCTION MOTORS FED FROM A 2 CURRENT SOURCE INVERTER UNDER FIELD ORIENTATION CONTROL

The field orientation control method of induction motors has been applied in order to give the induction motor ad.c. motor - like characteristics. This paper is directed to study the starting characteristics of such a system inorder to determine starting time, maximum peak current passing in the windings and maximum peak torque produced during the staring period . The starting characteristics of an induction motor fed from a current source inverter under field orientation control are developed. The starting current and torque with this mode of control were compared with those which will be developed when the motor is fed from a sinusoidal 3-phase voltage source.The superiority of the starting characteristics of a 7.5 kW motor with field orientation control was observed if compared with the characteristics of the motor when fed from a sinusoidal supply. The field orientation control can be applied in industrial plants as well as the utilization in service centers of aircraft engines and their appliances. The mentioned control technique can help too much in the development of aircraft electrical equipment , as well as for different aircraft actuators and their hydraulic equipment.