THE USE OF THE DYNAMIC PROPERTIES OF SPECTRA OF SEQUENCES OF RADIO PULSES TO ENSURE HIGH SENSITIVITY OF THE TEST CONTROL WINDINGS OF ASYNCHRONOUS MOTORS

The analysis of existing methods of diagnostics test of the windings of asynchronous motors demonstrated that a large error of measurement of diagnostic parameters is due primarily to the instability of the measuring equipment. Sole increasing the sensitivity of the measuring instrument increases the probability of a false conclusion on the faulty winding and can only be used in conjunction with other methods of ensuring high signal-to-noise ratio. During the research fulfillment it was found out that direct way of suppressing uninformative spectral components and distortions caused by the instability of parameters of the testing signal is complex and most difficult to be implemented. Thus, more appropriate is the selection of individual characteristic frequency components of the signal, which has high sensitivity to change of informative parameter of the measuring signal (for example, the time delay between two periodic sequences of pulses) and low sensitivity to random deviations in the signal due to instability in the functioning of the elements of the measuring circuits (for example, to deviation of the phase of the signal). Moreover, adjusting the amplitude, repetition period, pulse duration and delay time pulse sequences it is possible to implement a mathematically justifiable control of the parameters of the spectrum (to move the position of the zeros of the amplitude spectrum, to change the amplitude of the spectral components). The use of the dynamics of the spectra by controlling their parameters will ensure a high sensitivity to change of the informative parameter of the measuring signal, characterizing the degree of development of defects in the windings of asynchronous motors.

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