Stator Inter-Turn Short-Circuits Fault Diagnostics in Three-Phase Line-Start Permanent Magnet Synchronous Motors Fed by Unbalanced Voltages

This paper addresses the diagnostics of stator faults in three-phase line-start permanent magnet synchronous motors. More traditional fault diagnostic methodologies are unable to properly diagnose inter-turn short-circuit motors under unbalanced supply voltage conditions, since both conditions impact indicators used for a similar way. In this paper, relation between symmetrical components quantities and harmonic Extended Park’s Vector Approach (EPVA) is established. It proved that negative component EPVA at frequency twice directly related occurrence. also healthy motor impedance constant not load-dependent. Based on this, impedance/admittance indirectly analyzed, through combined use Park´s current, explored diagnostics. Experimental results, obtained different load torques, values, severity levels, show can be achieved even based analysis admittance, frequency, sequence admittance.