Motor drives fault diagnosis by the new non invasive Beirut diagnostic procedure

A new method of obtaining diagnostic data from induction motors derived from only two of the three stator currents, the Beirut diagnostic procedure "BDP" is presented in this paper. The theoretical principles directly related to the application of this diagnostic technique are described, emphasizing the use of a severity factor in order to evaluate the extension of the fault. Besides the traditional one phase current spectrum analysis, values of the severity factor related to electrical signals like instantaneous powers, the current space vector modulus and finally related to the new Beirut diagnostic method are analyzed with respect to the power factor angle variation and the sum of the two current side-band angular displacement variation. By theoretical analysis, computer simulations, and laboratory experiments, it is shown that the new method, Beirut diagnostic procedure, enhance the reliability of diagnostics of induction motor drives.