Sensorless V/f control with MRAS speed estimator for a five-phase induction machine under open-circuit phase faults

Ahmed S. Morsy, Ayman Abdel-Khalik, Shehab Ahmed, Ahmed Massoud

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


This paper introduces a sensorless scalar controller with MRAS speed estimator based on simple Proportional Resonant PR controllers to provide a disturbance-free operation to a five-phase induction machine under phase open and based on optimal current control. The machine speed is estimated using MRAS observer based on rotor flux (RF-MRAS). Under open phase, the torque-producing fundamental sequence current is used to estimate the required third sequence current components to ensure equal remaining healthy currents. Two PR controllers are then used to determine the corresponding third sequence voltage components. The used optimization criterion ensures maximum fundamental torque, minimum torque ripples, and equal line currents. The proposed controller is verified using a 1.5hp prototype machine for both dynamic and steady-state cases.

Original languageEnglish
Title of host publication2013 7th IEEE GCC Conference and Exhibition, GCC 2013
Number of pages6
Publication statusPublished - 2013
Event2013 7th IEEE GCC Conference and Exhibition, GCC 2013 - Doha, Qatar
Duration: 17 Nov 201320 Nov 2013


Other2013 7th IEEE GCC Conference and Exhibition, GCC 2013



  • Fault tolerance
  • Five-phase Induction Machine
  • Sensorless speed estimation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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