ЕЛЕКТРОПРИВОД ОБЕРТАННЯ КОЛІСНОЇ ПАРИ ДЛЯ ІНДУКЦІЙНОГО НАГРІВУ РЕБОРД

The article solves an actual scientific and technical task, which concerns the stabilization of the speed of rotation of the wheel pair for the purpose of uniform heating of the flanges. The general design of the device for dismantling wheel pairs is presented, the device of wheel pairs contains an inductor. The disadvantage of this device is low efficiency, a large amount of time spent on dismantling. It is noted that the installation for induction heating of parts has a U-shaped magnetic wire. The disadvantage of this installation is that its structure increases the total dissipation factor of the winding, while reducing its energy indicators. At the same time, an induction heating device with two inductors is used to heat any type of surface. The disadvantage of this device is the limitation of the area of ​​use, a small efficiency and power factor. Based on the results of the analysis of the latest research and publications, it was determined that the most promising is the use of an asynchronous valve cascade system, which has advantages over other systems of regulation by an alternating current motor. The principle diagram of automatic control according to the AVK scheme is given. A mathematical description of the static start-up and braking characteristics of this system is provided, as well as static and dynamic processes are calculated on the basis of the mathematical description, transient calculation processes through the rectified current circuit of the cascade are constructed. The accuracy of motor speed regulation is provided by speed and current feedback. The structural diagram of the AVK is shown, which consists of typical dynamic links: a proportional speed regulator and a proportional-integral current regulator. The obtained speed diagram, which demonstrates the starting mode, movement at nominal speed and regenerative dynamic braking, the source of additional EMF is a periodic circuit of the first order. It is determined that the electric drive system according to the AVK scheme has lower powers of the rotary frequency converter and provides recovery of slip power to the network.