Abstract
The article investigates the electric drive system of the 1E61M lathe, which is widely used at metalworking enterprises. The existing power system assumes the availability of a three-phase grid, it does not provide a smooth start and speed control of the main movement of the machine. The paper proposes to increase the efficiency of the electric drive system of the 1E61M lathe through the use of a variable frequency drive based on the widespread frequency converter AE200-4.0 G. Its main advantages are low cost and the ability to supply power from a single-phase grid. The use of this frequency converter made it possible to reduce the current consumption from the grid by 56%, which indicates an increase in efficiency; to ensure a smooth start of the electric motor and to improve the control characteristics of the electric drive system. To analyze the electromagnetic compatibility with the electrical network, a study was carried out using the Metrel MI 2885 Master Q4 power quality analyzer and the Metrel PowerView specialized software. This analyzer provides the power quality standard IEC 61000-4-30, class S,compatibility to the standardsIEC 61557-12 and IEEE 1459-2010 and IEC 62053-21 requirements. It has been found that the use of the AE200-4.0 G frequency converter does not meet the requirements of the electromagnetic compatibility of the electrical equipment of the network. Besides the use of a frequency converter without an output sine filter degrades the energy efficiency of the electric drive system by reducing the resource of the electric motor, which is not designed to operate as part of a variable frequency drive. The selection and calculation of input and output filters will improve the efficiency of electric drive systems based on frequency converters
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