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Background: Production of energy-efficient continuous operation equipment ensuring symmetrical heating to a given depth for thermal treatment of spherical products without oxidation and decarburization is an urgent problem in a number of industries, such as mass production of milling bodies for mining and concentrating enterprises and cement plants, balls for rolling bearings and valves in hydraulic systems, as well as wear-resistant balls in the backwater gates of deepwell pumps for oil production, etc. Induction heating with direct high-rate (several seconds or fractions of a second) conversion of electric energy into heat meets these industrial heating requirements best of all. This method of heating is characterized by simple temperature and heating depth control, which makes it possible to obtain the optimum combination 1 Данное исследование было выполнено по программе «Старт» Фонда содействия инновациям (договор No 1195ГС1/21661 от 05.05.2016).  «Вестник ИГЭУ» Вып. 2 2017 г.  ФГБОУВО «Ивановский государственный энергетический университет имени В.И. Ленина» 44 of a high surface hardness (back-to-back endurance) of products with a relatively plastic core (anticracking) after quenching and tempering. However, despite all these advantages of the method, it is currently only applied around the world to ensuring the required heating symmetry of continuous or near-continuous cross section products. All this makes it urgent to develop an inductor control system for electrotechnical equipment with the above-mentioned characteristics. Materials and methods: The study employed the automatic control theory, induction heating theory and mathematical modelling methods. The equations of the mathematical models were solved on a computer in the mathematical software packages Simulink and FEMM (trial versions of both programs). Results: We have developed and studied an inductor control system designed to heat both fixed spherical metal products and those moving through the inductor. The operation principle of the control system is a combination of frequency and pulse-width modulation with continuous frequency adjustment to the resonance one. In this work, we present the results of functional tests of the developed control system on a simulation model in the Simulink software (free trial version). Conclusions: The obtained results will be used for developing electrotechnical equipment microcontroller software for symmetrical induction heating to a predetermined depth by overfrequency currents before thermal treatment of spherical metal products. The mentioned electrotechnical equipment can be used at the enterprises producing spherical metal products operating under heavy conditions caused by impact and other types of loading of contact surfaces. Such products, first of all, include milling balls (iron ore concentration at ore-mining and concentrating enterprises) and balls for rolling bearings of various types and sizes.

Development and study of a control system of the electrotechnical equipment inductor for symmetric induction heating of spherical metal products