Development of contactless switching devices for asynchronous machines in order to save energy and resources

Abstract

To limit the inrush currents in the stator windings, various schemes for starting an asynchronous electric motor are used. In addition, the existing devices have a complex control system, which creates certain difficulties in installation and operation. But the analysis of scientific literature and materials from certain sources testifies to the insufficient study of this problem. In scientific work, the advantages and disadvantages of a new type of contactless starter are compared with contact and non-contact starters of various types. An original circuit of a new type of thyristor starter with a simplified design has been developed and manufactured, which has the ability to smoothly start and control the power consumption of asynchronous machines. Computer simulation of a new type of contactless starter with pulse-width modulation control in the Matlab Simulink program has been carried out: a pulse current is supplied to the controlled thyristor electrode on the basis of the pulse-width modulation control and the thyristor opens and passes the current, the resistance is set to decrease the input signal level. The design of the proposed starter is based on the combination of a thyristor starter with logical control, which has the ability to smoothly start and remote control of the power consumption of asynchronous electric motors, which has the ability to save energy and resources. Modern methods of implementing a logical control system, a pulse current generator with RLC filters, are proposed, and the task of remote monitoring and control of power consumption of asynchronouselectricmotors is set.

Improvement of the cooling system of reactive power compensating devices used in railway power supply

“…Research focuses on the design, size, and parameters of control and management elements and devices, software, and the development of advanced technical solutions for signal converters. Developing control over the value and parameters of reactive power consumed by the electric traction composition (ETC) moving on electrified railways requires the widespread use of digital technologies in modern compensation devices [7][8][9][10]. Additionally, the issues of developing and creating new structures of primary signal conversion devices based on modeling processes and tools are considered urgent.…”