METHOD OF DIAGNOSING TECHNICAL CONDITION OF ELECTRIC MOTORS IN REAL TIME Russian patent published in 2024 - IPC G01R31/34 

FIELD: measuring.

SUBSTANCE: invention relates to measurement equipment, namely to diagnostics of technical condition of electric motors, and can be used for monitoring of current technical condition of electrical equipment. Reference signals of current sensors installed on phase conductors of serviceable electric motor are determined, and their mathematical processing is performed. Experimental signals of current sensors installed on phase conductors of the diagnosed electric motor are determined, their mathematical processing is carried out and reference and experimental processing results are compared. During mathematical processing of signals of current sensors of the electric motor being diagnosed, values of consumed currents are measured and recorded at arbitrarily selected frequencies of shaft rotation. Further, for both the serviceable and the diagnosed electric motors from the arrays of the received signals of the consumed currents by the non-intersecting window method, the average value by the window size k is calculated, calculating dispersion by window size k, cumulative sum for calculated signal dispersions by window size k, calculating values of dispersion range function between minimum and maximum values of cumulative sums of signal dispersion by window size k. Reference values of the dispersion range function are fixed for the fixed frequencies of the shaft rotation. Reference values of dispersion range function for serviceable electric motor are compared with calculated values of dispersion range function for diagnosed electric motor. If the values of the dispersion range function for the diagnosed electric motor are more than the values of the dispersion range function for the serviceable electric motor by 8% and more, then a conclusion is made on the presence of a defect in the said electric motor. Otherwise, no defect is detected in the electric motor.

EFFECT: improving reliability of diagnostics of technical condition of electric motors by analysis of current signals during continuous operation.

1 cl, 2 dwg