EVALUATION OF THE EFFECTIVENESS AT THE IDENTIFICATION THE PARAMETERS OF ASYNCHRONOUS MOTORS OF THE USE OF DIFFERENT FORMS OF POLYHARMONIC SIGNALS

Nowadays, there is a high percentage of the malfunction of induction motors (IM) as it is the most massive type of electrical machines. This happens due to some disadvantages of the exploitation, low quality repair, the natural aging process, violations of the manufacturing technology. Currently, considerable attention is paid to the determination of the electromagnetic parameters (EMP) IM. These parameters may be changed under the long-term usage or carrying out repairing. The analysis of the existing methods for the determination of EMP IM revealed their main disadvantages and justified the use of the components of the instantaneous power within the identification problems. To simplify the procedure of determination EMP of IM it is offered to apply so-called "pseudopolyharmonic" signals which are formed from the sinusoidal by means of the converting. Therefore, the aim of the work deals with the method of determining EMP IM using the components of instantaneous power throughout a sinusoidal voltage source. To identify the EMP of IM it is applied the energy method based on the equations of balance of the instantaneous power. Obtaining the neces-sary harmonic content it is provided by the decomposition of the measured decrease in the period of sinusoidal voltage and current signals at a given angle. The analysis of the results using this approach provided the evidence that the error identification of EMP IM did not exceed 15 %. This is due to the fact that the reduction at the expansion of voltage and current signals leads to a violation of equality in the balance equations, constitute the instantaneous power at the power source and the elements of the equivalent circuit. Consequently, to eliminate this error it is not necessary to truncate the proposed voltage and current signals, but it is essential to truncate the signals of the instantaneous power at the source and the elements of the equivalent circuit. As a result, the error identification EMI BP did not exceed 5 %. Thus, the effectiveness of the use of the energy method of identification by means of EMI BP pseudopolyharmonic signals of different configurations.