The Neutral Voltage Difference Signal as a Means of Investigating Eccentricity and Demagnetization Faults in an AFPM Synchronous Generator

This article investigates the neutral voltage difference signal, VNO for fault diagnosis. The aforementioned signal is of between common star point stator and load. under-study faults are demagnetization static eccentricity faults, while machine in which investigated an axial flux permanent magnet (AFPM) synchronous generator, suitable wind power applications. study was conducted using a 3D finite element method (3D-FEM), machine’s FEM model validated through experiments. one most accurate methods electrical computation, allowing detailed electromagnetic behavior. components that constitute were determined 3D-FEM software program (Opera 18R2). Subsequently, further analysis performed MATLAB R2022b software, fast Fourier transform (FFT) applied to this signal. In all faulty cases, new harmonics appeared, healthy amplitudes already existing increased. These findings can be used identification. revealed harmonic frequency 1.5fs dominant case demagnetization, eccentricity, equal operating frequency, fs. novelty has not previously been identification, especially AFPM machines. depends on EMF phase currents but less sinusoidal. Consequently, it detect cases where signals cannot detection.