Low-cost fault tolerant based speed sensorless vector control of induction motor drive system

Abstract EN

Induction motor is a cast of alternating current motor where charge endures allotted to the rotor close-at-hand deputation of conductive charge.

These motors are broadly applied in industrial claim due to they are arduous along with adhere no contacts.

To develop highly reliable and fault tolerant induction motor drive system a major concern and extensive research has been dedicated.

This paper presented the performance analysis of fault tolerant of three phase inverter fed speed sensorless control of three phase induction motor drive.

To increase the reliability of the drive system, this paper presents fault tolerant of inverter when one switch is open or one leg of six-switch inverter is lost.

The control of drive system is based on indirect rotor field oriented control theory.

Also, the methodology depends on speed sensorless scheme to obtain the speed signal feedback; the speed estimator is based on model reference adaptive system using stator current and rotor flux as state variables for estimating the speed.

The fault tolerant algorithm is able to adaptively change-over from six switch inverter to four switch inverter topologies when the fault is occurred; also, it makes a smooth transition of the motor speed, torque and current when changing over from faulty condition to new healthy status which is Four Switch Three Phase Inverter (FSTPI) topology, thus, the Six Switch Three Phase Inverter (SSTPI) topology (pre-fault status) almostly retained.

The proposed algorithm is simulated by using the Matlab/Simulink package.

The obtained results from the simulation model demonstrate the performance enhancement and good validity of the fault-tolerant control for speed sensorless induction motor drive system.