ANALYZE THE PERFORMANCE OF CSI FED INDUCTION MOTOR WITH A NOVEL MRAS BASED CONTROLLER TO MINIMIZE THE TORQUE RIPPLE

Abstract

A simple mathematical model is
constructed to analyze the performance of Sensorless
Field oriented controlled Current Source Inverter
(FOC - CSI) fed induction motor drive to minimize the
torque ripples during low speed operation is proposed
in this paper. The estimated torque and stator flux are
significant to control the system effectively in FOC.
However the torque and stator flux are adversely
affected by the stator resistance variations due to
temperature and low frequency results torque ripples
and the system becomes unstable. A new model
reference adaptive system (MRAS) based algorithm
for torque estimation is analyzed mathematically in
Field oriented vector controlled CSI fed induction
motor. The MATLAB/Simulink and hardware results
reveal that the proposed method is able to obtain
precise flux and torque control, even for very low
speed operations.