Analiza porównawcza napięć wałowych w różnych silnikach indukcyjnych dużej mocy

The paper presents results of researches aimed at bearing faults detection in the high power induction motors. In chapter 2 are presented the causes of shaft voltages and bearing currents forming. The figure 1 shows the graphical presentation of the bearing currents forming issue. In the chapter 3, on the figures from 2 to 10 are shown different kinds of bearing damages arising in considered motors. In the chapter 4 is presented description of laboratory stand. The figure 12 presents diagram of measuring system. In the chapter 5 is presented influence of supply voltage unbalance on the value of shaft voltages. In the chapter 6 waveforms of shaft voltages, and their Fourier transforms are shown in Fig. 16, 17. Conclusions drawn from laboratory researches are presented in chapter 8.