Double Stage Drive System for Induction Motor Based on Direct Axis Current Control

Abstract

This paper deals with double stage drive system of 3-phase induction motor. As 3-phase induction motor consider as load thus its speed and torque at output shaft counts as performance parameter. One of these two stages is to control over DC voltage use to fed in inverter set provide controlling over output shaft torque. A feedback signal of torque generate error signal of PID controller which control output voltage level of phase control rectifier. This controlled voltage is fed to inverter where another stage comes into existence. Conversion of 3 to 2 phase of load current use as feedback signal for this stage of controlling. Another PID controller is use to control direct axis current of output supply of inverter. This 3-phase controlled output of inverter is fed to the armature winding of 3-phase induction motor by which controlling over speed will achieve. Simulation result will show the effect of this two stage controlling technique in the performance of 3-phase induction motor.