Mathematical modeling of damage in an asynchronous electric motor

The paper presents brief statistics on damage to asynchronous electric motors, which serve as drives for the main equipment of metallurgical industry enterprises and for the auxiliary systems of electric power plants. It is noted that the most frequent faults include damage to the bearing unit, stator windings and rotor bars. Among the general statistics of failures of the electrical part of asynchronous electric motors, the majority are damages associated with the development of cracks or destruction of the bars of the squirrel-cage rotor winding. Operation of asynchronous electric motors with broken bars can lead to damage to the windings and the stator magnetic circuit, resulting in complete motor failure. The mathematical model of an asynchronous electric motor presented in this work enables the simulation of asynchronous electric motors with any number of damaged bars in a squirrel-cage rotor, facilitating the analysis of transient processes in the event of broken rotor bars. The mathematical model proposed in the work can be used to determine the efficiency of existing methods for diagnosing the state of an asynchronous electric motor by means of their mathematical modeling or to determine criteria and develop new methods for diagnosing the electrical part of an asynchronous motor based on the analysis of transient processes in the stator windings in the event of damage to one or more rotor bars and damage to the stator windings.