Ural Federal University named after the first president of Russia B. N. Yeltsin, Ekaterinburg, Russia:

N. R. Safin, Post-Graduate Student
V. A. Prakht, Associate Professor, Candidate of Engineering Sciences
V. A. Dmitrievsky, Associate Professor, Candidate of Engineering Sciences, vdmitrievsky@gmail.com
A. A. Dmitrievsky, Post-Graduate Student

The article addresses the issues of the functional reliability of cage asynchronous motors. It is emphasized that the fi rst reason of failure of the motors is the wear of bearings. There are a number of basic methods of equipment diagnostics: vibrational, electromagnetic and thermal. Alongside with them, it becomes popular to use the current method based on the analysis of the frequency–response characteristics of consumed current. This is a promising method as it allows measurements to be taken without intervention into normal operation of the motor. The current method based on the Park vectors enables accounting for all three phases of current consumed by a motor. In connection with this, capabilities of monitoring and diagnostics of failures in bearings of asynchronous motors using the Park vectors and the method of spectrum analysis of the stator currents are studied. The main aspects as well as the experimental results and their analyses are described. It is shown that the advanced diagnostics of asynchronous motors with regard to the stator current by the Park method allows early detection of defects in bearings. The authors identify the spectrum harmonics, divisible by the rotor speed, that have amplitudes clearly pronounced in operation of asynchronous motors with damaged bearings.
This study has been supported by the Ural Federal University in the framework of the UFU Development Program for the winners of the UFU Young Scientists competition.

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