Abstract

This paper presents methods to detect and diagnose an inter-turn short circuit in an interior permanent magnet synchronous machine. The proposed method detects the inter-turn short circuit fault using a current observer to estimate a specific disturbance related to the fault. This disturbance is defined as a fault index current. The fault index current estimates in the rotor reference frame have information about the location and the percentage of shorted turns. A novel stationary frame tracking technique is proposed to simultaneously determine the fault index current in the stationary frame and the fault position. Look-up tables are implemented to correlate the stationary frame fault index current magnitude to the percentage of shorted turns. Thus, providing an estimate of the percentage of shorted turns.

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