METHOD TO DETERMINE SLIDING OF INDUCTION MOTOR ROTOR Russian patent published in 2012 - IPC G01R31/34 

FIELD: electricity.

SUBSTANCE: method includes assessment of a rotor sliding value using a chart of sliding dependence on a consumed current value, digital registration of instantaneous value of consumed current amplitude in tome on one of phases of an induction motor supply cable, the main harmonic is identified, as well as a high-frequency component of a consumed current signal with the help of two band filters. Grid frequency is calculated using the main harmonic, then range limits are identified for frequencies searching. Afterwards, having excluded frequencies caused by saturation of rotor magnetic conductors and a current sensor from the ranges, frequencies of tooth harmonics of the first order are found, using which two values of rotor sliding are produced, induction motor rotor sliding is identified by arithmetic mean of these values, and the conclusion is made on result reliability by comparison of two sliding values, calculated by frequencies of rotor tooth harmonics of the first order.

EFFECT: higher accuracy and validity of produced result, elimination of necessity to do additional measurements to produce a valid sliding value.

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