Abstract
The multiphase induction motor is considered to be the promising alternative to the conventional three-phase induction motor, especially in safety-critical applications because of its inherent fault-tolerant feature. Therefore, the attention of many researchers has been paid to develop different techniques for detecting various fault types of multiphase induction motors, to securely switch the control mode of the multiphase drive system to its post-fault operation mode. Therefore, several fault detection methods have been researched and adapted; one of these methods is the indices-based fault detection technique. This technique was firstly introduced to detect open-phase fault of multiphase induction motors. The main advantage of this technique is that its mathematical formulation is straightforward and can easily be understood and implemented. In this paper, the study of the indices-based fault detection technique has been extended to test its applicability in detecting some other stator and rotor fault types of multiphase induction motors, namely, open-phase, open-switch, bad connection and broken rotor bar faults. Experimental and simulation validations of this technique are also introduced using a 1 kW prototype symmetrical six-phase induction motor.
Highlights
The technological progress made in power converters and semiconductor switches helps in growing the interest in studying multiphase-based drive systems
If for example, R a1 value was above its threshold value, this indicates that there is an open-circuit fault in phase a1 which could be an open-phase fault (OPF), open-upper switch fault (OUSF) or open-lower switch fault (OLSF)
In this study the indices-based fault detection technique was investigated against various types of faults
Summary
The technological progress made in power converters and semiconductor switches helps in growing the interest in studying multiphase-based drive systems. Various variations of open-phase faults (one-phase, two adjacent phases and two non-adjacent phases fault) under different operating conditions are tested, and it is proved through simulation and experimental results that a robust and fast detection performance can be achieved either in open-loop or closed-loop drive control The recognition that this fault detection technique could be used to detect various types of faults is necessary to widen its applicability and make use of its simplicity, reliability and robustness. The rest of the paper is organized as follows: Section 2 presents the mathematical modeling of the six-phase induction motor, whereas Section 3 introduces the mathematical formulation of the indices-based fault detection technique.
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