Instantaneous stator power as a medium for the signature analysis of induction motors

Quantitative analysis of noninvasive diagnostic procedures for induction motor drives

“…Also, we generate the current space modulus by using the well known Park Transformation as seen in Eq. (9). For each computed signal, the fast Fourier transformation is applied then the spectrum is normalized according to its reference.…”

“…This allows larger potential capabilities, since other quantities beyond one phase line current are accounted. The current signature analysis is replaced by a diagnostic procedure based on analysis of the amplitude at the frequency ''f osc '' in the spectrum of the space vector current modulus [7,8], the instantaneous powers [9][10][11], and the electromagnetic torque [12][13][14][15][16]. In order to classify the electrical diagnostic methods, the study in [12] treated a comparison between the three instantaneous powers using a restrictive model.…”

A Novel On-line Intelligent Shaft-Torsional Oscillation Monitor for Large Induction Motors and Synchronous Generators

“…Previous indirect methods only use the sudden change of the machine air-gap torque. The stator current provides complete information about unstable torsional mode [1][2][3][4][5][6][7][8].…”

Detection of Mechanical Imbalances of Induction Motors with Instantaneous Power Signature Analysis

“…The equation for the partial instantaneous power in the case of an eccentricity fault is given by (12) [19,20,22]. It can be seen that the instantaneous power spectrum contains an additional component at the modulation frequency.…”