ПРИМЕНЕНИЕ ИНДУКЦИОННОГО НАГРЕВА ДЛЯ РЕМОНТА ЭЛЕКТРОДВИГАТЕЛЕЙ

Abstract

The quality of the production process depends on the reliability of technological and electrical equipment. The technological process of repairing electric motors includes the assembly of the electric motor and its installation. To date, the dominant position for performing this operation is occupied by the methods of “sledgehammers” or “oil baths”. The assembly of the electric motor can be carried out after heating of its individual parts. Both of these assembly methods are quite time-consuming, time-consuming and require significant physical strength from the maintenance staff. One of the main tasks is to heat the motor housing to the required temperature, which ensures the free installation of the stator and rotor. The possibility of using induction heating at the final stage of repair of an electric motor is considered. Induction heating is the heating of conductive bodies in an electromagnetic field due to the induction of eddy currents in them. In this case, electrical energy is converted into thermal energy due to its triple conversion. The intensity and nature of the heating are influenced by the current frequency, the strength of the electric and magnetic fields. By changing the indicated values, it is possible to obtain the necessary character of heating, its intensity and uniformity. For the study, the line equipment and the assembly process of 14 sizes of electric motor housings of the DATA and AIML series were considered. Calculation of heating temperatures for connection with interference fit of the DATA 63 electric motor housing with a stator and a rotor with a bearing was made. The calculation results of the heating temperature in two ways showed that using the induction method, the elements of the electric motor heat up 15% faster than during the operation of the heater. When creating the installation, the following requirements must be taken into account: high electrical and thermal efficiency, ease of maintenance, ease of controlling the heating process, and the possibility of its full automation. The use of induction heating allows one to automate the heating process and assembly of the electric motor, and makes it possible to increase the accuracy of the process without reducing operating time, increasing the stability and quality of the entire process.