Abstract
The developed torque with minimum oscillations is one of the difficulties faced when designing drive systems. High ripple torque contents result in fluctuations and acoustic noise that impact the life of a drive system. A multiphase machine can offer a better alternative to a conventional three-phase machine in faulty situations by reducing the number of interruptions in industrial operation. This paper proposes a unique fault-tolerant control strategy for a five-phase induction motor. The paper considers a variable-voltage, variable-frequency control five-phase induction motor in one- and two-phase open circuit faults. The four-phase and three-phase operation modes for these faults are utilized with a modified voltage reference signal. The suggested remedial strategy is the method for compensating a faulty open phase of the machine through a modified reference signal. A modified voltage reference signal can be efficiently executed by a carrier-based pulse width modulation (PWM) system. A test bench for the execution of the fault-tolerant control strategy of the motor drive system is presented in detail along with the experimental results.
Highlights
In electric drives and machines, a three-phase machine is the default implementation in industrial applications
The theoretical and new control technique validated with operation modes of aconceptual star-connected background induction motor. of
The aexperimental results show that a five-phase experimental resultsmotor is presented here.byThe control technique the four-phase and three-phase induction drive supplied a faulty five-phase voltageenables source inverter can be successfully operated in the four-phase operation mode when
Summary
In electric drives and machines, a three-phase machine is the default implementation in industrial applications. Emphasis should be placed on possibilities with more than a three-phase machine which is difficult to achieve with conventional three-phase machines. The simple expansion of three-phase drives to multiphase drives is not sufficient. The advantages that can be achieved with the utilization of multiphase systems are investigated in [1]. Numerous endeavors concluded that multiphase machines have some inherent advantages such as higher reliability, higher frequency of torque pulsation with lower amplitude, lower rotor harmonic current, reduction in current per phase without expanding the voltage per phase, and less current ripple in the DC link [1,2,3,4,5]
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