DEVELOPMENT OF A RELIABILITY MODEL THAT TAKES INTO ACCOUNT CHANGES IN THE STATE OF STRUCTURAL COMPONENTS OF ELECTRICAL MACHINES

Statistic data concerning the trolleybuses operations in Ukraine prove that reliability of traction electric engines has been reduced for subjective and objective reasons over the past 10-15 years. New developments and the use of technologies are therefore needed for more effective use of the known technical equipment, its modernization, reliability improvement and extending the service life. To determine the effectiveness of trolleybus operation on the route, the modern methods of reliability assessment of the traction electric engines are used, which allow to get adequate characteristics of the structure, functional links of parts and units. Improving public transport services is linked to the efficient operation of urban electric transport. It depends on the capabilities and quality of individual components and units of rolling stock. In addition, power supply and traffic control systems play an important role. An important technical and economic indicator of quality for each technical system of electric transport or product is the concept of reliability, which characterizes the level of operating conditions of the main elements and characteristics of traction electric motors. One of the main criteria for the reliability of traction motors is the reliability of operation during operation. The conditions of operation of electric machines of trolley buses are analyzed and the main directions of increasing their operational reliability are determined. The nature of the change in the state of structural units of an electric machine during operation has been established. A mathematical model of reliability has been developed that takes into account changes in the state of structural units of an electric machine.