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Improved Rotor Flux Estimation for Field-Oriented Control in Induction Motor Drives

Authors

Tran C.D.; Kuchar M.; Nguyen P.D.

Publisher

Institute of Electrodynamics, National Academy of Sciences of Ukraine

Publication year
2025
Abstract

The  field-oriented  control  (FOC)  method  is  a  widely  used  technique  for  precise  speed  regulation  in  three-phase  induction  motor  drives.  The  resistance  values  of  the  motor  vary  from  their  rated  values  because  of  increased  temperature  during  operation.  The  research  aims  to  improve  the  accuracy  of  rotor  flux  linkage  (RFL)  estimation,  thereby  sustaining  the  performance  of  the  FOC  method  under  resistance  variations.  The  paper  proposes  a  more  advanced approach to estimating and integrating motor resistances into the RFL calculation. A new structure, featuring voltage,  current,  and  virtual  current  models,  is  used  to  determine  the  stator  and  rotor  resistance.  These  estimated  resistance  values  replace  the  rated  resistance  values  in  the  current  model,  which  are  then  used  to  calculate  the  RFL  vector. Simulations are performed to verify the accuracy of the estimated resistance values and the effectiveness of the improved  FOC  method  under  different  operating  conditions.  The  simulation  results  demonstrate  that  the  calculated  resistances  closely  match  the  preset  resistance  values,  confirming  that  the  enhanced  FOC  method  retains  high  estimation accuracy even when motor resistance changes. References 18, figures 9.

Index
WoS
Journals
Technical Electrodynamics