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access icon free Stator inter-turn faults diagnosis in induction motors using zero-sequence signal injection

This study presents a strategy for stator inter-turn faults diagnosis in induction motors (IMs) operating under time-variable load and time-variable speed conditions. The strategy consists in injecting a zero-sequence high-frequency signal in order to analyse variations in the stator inductances. Incipient stator inter-turn faults are detected by a simple signal processing of the derivatives of the currents. A feature of the strategy is that the zero-sequence high-frequency signal is generated by the inverter that feeds the machine, without modifying the standard space vector modulation of the IM-drive. Experimental results show that faults representing <1% of the stator winding can be detected, as well as the phase location of the fault, validating this proposal.

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-epa.2020.0461
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content/journals/10.1049/iet-epa.2020.0461
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