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This paper presents a new method of soft start of high-voltage and high-power asynchronous electric drives of auxiliary units in mining enterprises, pumping stations and thermal power plants. Advantages and disadvantages of the proposed method are substantiated. The possibility of soft starting of asynchronous motors of high power from thyristors of low power has been proved. The disadvantages in the analysis of existing methods have been studied, and suggestions and solutions have been given. In soft starting of low and medium power induction motors, uses the system "Thyristor voltage converter-induction motor". In soft starting of high-voltage and high-power induction motors, a method of starting using combined low-power thyristors was proposed, taking into account the fact that the prices of high-power thyristors are expensive and that they are unreliable. A scheme of operation of parallel and series low power thyristor groups has been developed. The main disadvantage of this method is the need for uniform distribution of current and voltage values. In the paper, technical solutions for uniform distribution of current and voltage values have been developed. It was proposed to develop an improved system "Thyristor voltage converter-asynchronous motor" formed of parallel-sequentially collllected low-power thyristor groups. [ABSTRACT FROM AUTHOR]

This article provides an analysis of the existing methods of smooth start-up of high-voltage and powerful asynchronous electric drives for auxiliary units in mining enterprises and thermal power plants. The shortcomings in the analysis of existing methods were studied, proposals and solutions were given. For smooth start of asynchronous motors of small and medium power, it uses the system "Thyristor voltage converter-asynchronous motor". This method cannot be directly used for soft starting of high-voltage and powerful induction motors. In the soft start of high-voltage and high-power induction motors, a starting method has been proposed using combined low-power thyristors, taking into account the fact that the prices of high-power thyristors are expensive and unreliable. The main disadvantage of this method is the need for an even distribution of current and voltage values. The article has developed technical solutions for the uniform distribution of current and voltage values. It was proposed to develop an improved system "Thyristor voltage converter-induction motor", formed from parallel-series-connected thyristor groups of low power. [ABSTRACT FROM AUTHOR]

In this article, we will look at the general issues related to the creation and use of controls for variable induction ball mill motors. The automated operation of the electric drive of this mill fulfills the following important requirements: conversion of electrical energy into mechanical energy, which is necessary for the implementation of this technological process; management of processes to improve product quality with a degree of optimization according to a number of criteria, for example: ensuring maximum productivity, accuracy and quality of the work process. Minimal energy consumption of materials, etc. Specific control tasks are diverse and are determined by the nature of the technological process. In addition, the function of an automated electric drive is all integrally connected with the need to regulate the values that characterize the movement of the electric drive, the speed of the moment, position. The automated ball mill loading control System (ACS CMM) is designed to monitor and control the loading of ball mills with ore and water, as well as control the technological process of the ball mill. [ABSTRACT FROM AUTHOR]