METHOD FOR DETERMINING ROTOR SLIP OF ASYNCHRONOUS ELECTRIC MOTOR Russian patent published in 2010 - IPC G01R31/34 

FIELD: electricity.

SUBSTANCE: method consists in the fact that in steady-state operating mode of asynchronous motor there recorded at the same time are instantaneous values of currents of three phases of stator power, module of resultant vector of stator current is determined , where i_a, i_b, i_c - instantaneous currents of stator windings, and discrete Fourier transformation of module of resultant current of stator and one of stator currents is performed. Amplitude-versus-frequency response characteristics of module of resultant vector of stator current and one of stator currents are obtained. The main frequency component f_s0 of module of resultant stator current vector within frequency range of 0 to 50 Hz and the main component of one of stator currents with the biggest amplitude and with frequency f_c is determined. Rotor slip is determined by using these values.

EFFECT: enlarging the range of hardware, decreasing the number of operations and reducing the time for determination.

2 cl, 8 dwg, 1 tbl