Asynchronous motors are a frequent power member of electric drives. In engineering practice their reliability is important. Although the available literature indicates a high reliability of these machines, in many applications reliability needs to be monitored and evaluated. A significant role in this process occupies technical diagnostics. Engineering practice knows a considerable amount of diagnostic methods; for our purposes, the important ones are the following: vibration and noise diagnostics, thermodiagnostics, electrodiagnostics, etc. The results of diagnostics can be evaluated in different ways; the present paper demonstrates the use of fuzzy expert systems, in particular it deals with a partial problem related to the application of vibration diagnostics. Based on the measurement of values of vibrations of the experimental stand, its fault has been clearly identified.
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