دانلود DYNAMIC D-Q AXIS MODELING OF THREE-PHASE ASYNCHRONOUS MACHINE USING MATLAB

Abstract

This  paper  presents  a  dynamic  d-q  axis  model  of  three-  phase  asynchronous  motor  in  synchronously rotating  frame.  The  systems  of  differential  equations  representing  the  dynamic  state  behaviours  of  the  machine  as developed  are  implemented  in  MATLAB/SIMULINK.  The  effects  of  the  stepped  sequence  of  mechanical  loading  on the motor output variables namely: three-phase stator currents (i_a, i_b and i_c), electromechanical torque and rotor speed, d-q  stator  and  rotor  currents  (i_qs,  i_ds,  _iqr  and  i_dr),  d-q  voltages  (v_qs  and  v_ds)  are  examined.  The  results  obtained  clearly show the elegance of the d-q axis transformation theory in machine modelling and the inherent limitations of the direct-on-line starting of 3-hp and 2250-hp asynchronous motors.