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2 Maszyny Elektryczne : zeszyty problemowe

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Modelowanie numeryczne wybranych algorytmów diagnostycznych maszyn asynchronicznych

Sołbut A.

Maszyny Elektryczne : zeszyty problemowe

2007

Nr 77

15-18

Results of numerical modeling of squirrel-cage asynchronous motor with rotor circuit damages are presented in the paper. Possibilities of machine state rating in normal exploitation, based on the moving RMS signal and also proposed motor drive state estimation factors are also included. For modeling of the machine and proposed algorithm, the original program solution based on built C++ class library had been used. It had been shown, that the application of currents and voltages symmetry estimation factors and moving RMS currents and voltages diagrams oscillation estimation factors provides the identification of damage location. Analysis of proposed factors values makes the basis for indicating of damage location - either the supply source, or the stator circuit, or the rotor circuit asymmetry. Modeled damages have shown that not only the number of damaged rotor bars, but especially their symmetry in the rotor circuit has relevant meaning. Presented simulation results are being used for testing of proposed algorithms and building of a diagnostic device, based on Analog Devices SHARC 21065L processor.

Nieinwazyjna diagnostyka wirnika maszyny asynchronicznej

Weinreb K., Węgiel T., Sułowicz M.

Maszyny Elektryczne : zeszyty problemowe

2004

Nr 69

35-40

Paper presents the non-invasive method of complex estimation of rotor state for cage induction motors, based on analysis of stator winding currents. FFT amplitude spectral analysis is usually applied for the stator current in chosen phase. Such approach is correct if the estimation concerns only the cases electrical cage asymmetry or dynamic eccentricity. The simultaneous appearance air-gap and cage asymmetry or static eccentricity and asymmetry of supply voltage makes correction quantitative analyze impossible. To minimize these difficulties the increase of the numbers of diagnostic signals (measure currents in three phases) and better use of information from diagnostic signals (use phase spectrum of current) is necessary. This paper deal with this problem. The stator phase currents in steady state are calculated by a harmonic balance method. The results show that there are important differences in the amplitude and phase spectrum of stator currents, which can be utilized for rotor condition monitoring and diagnostic purposes.