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

OTERO, MARCIAL; DE LA BARRERA, PABLO M.; BOSSIO, GUILLERMO R.; LEIDHOLD, ROBERTO

IET ELECTRIC POWER APPLICATIONS

INST ENGINEERING TECHNOLOGY-IET

Año: 2020 vol. 14 p. 2731 - 2738

1751-8660

This study presents a strategy for stator inter-turn faults diagnosis in induction motors (IMs) operating under timevariable 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