APPARATUS FOR DETECTING BROKEN ROTOR-BAR IN INDUCTION MOTOR

摘要

The present invention can be analyzed over the state of the rotor bars from changes in magnetic flux of the induction motor, online, In a simple and relates to a rotor bar failure detecting device of an induction motor is correctly detected as an abnormal state, the abnormality detecting device according to the present invention is installed on the inside of the induction motor, by detecting the changes in magnetic flux generated in the induction motor at a predetermined electric magnetic flux detector for outputting a signal; Amplification of the detection signal outputted from the magnetic flux detector, noise reduction, analog / digital conversion, and fast Fourier transform (FFT) for signal processing; Based on the fast Fourier transform data output from the signal processor, the signal analysis unit for determining the presence of error in comparing the frequency content of the form appears at the center frequency and the total frequency band to the rotor bars; And it indicates whether more than a determined rotor bars in the signal analysis unit, and an output unit is configured to generate an alarm for the event of more than this.