Abstract
This article deals with installations with complex and nonstandard executive instrument movement. Having analyzed the technical implementation and operational features of cold-rolling pipe mills, the research team formulated the problem of synthesizing electric drives of auxiliary mechanisms. It is shown that the conditions for choosing a mechanical converter are associated with the oscillation of the processes of the electric drive system. The finite element method and the gradient descent method are used for structural analysis of solids and electromagnetic calculations. The data of the specific cost of semiconductor converters were analyzed using a linear least-squares regression technique. The advantages of a synchronous reluctance motor of independent excitation for the electric drives of auxiliary mechanisms are given and substantiated. The optimization of the geometrical parameters of the electromechanical converter was carried out according to the maximum developed electromagnetic torque. Modern semiconductor technology in the design of special-purpose electric drives leads to a revision of the principles for determining the optimal number of phases and the structure of the motor power supply. The rationale for the use of multilevel frequency converters is given. Taking into account an in-depth preliminary analysis and an integrated approach, these tasks were successfully completed, which was confirmed experimentally at the implementation of the developed system.
Highlights
Pilger mills are widely used for the production of seamless pipes of various sizes
Cold-rolling creates pipes that are accurate in geometric dimensions with high-quality inner and outer surfaces
Of the features thefeatures operation andoperation technicaland implementation of the electric of these mills, careful study ofofthe of the technical implementation of drives the electric drives of from position of the tasks set, shows to ensure thetoseparate but separate coordinated of these the mills, from the position of the tasksthe set,need shows the need ensure the but operation coordinated auxiliary mechanisms and the main drive, and the ability to work out the resulting overloads without operation of auxiliary mechanisms and the main drive, and the ability to work out the resulting significantly affecting product quality
Summary
Pilger mills are widely used for the production of seamless pipes of various sizes. Depending on the purpose of the pipe (oil industry, chemical industry, mechanical engineering, civil engineering, etc.), the quality requirements can vary significantly. Among the several successive rolling stages in pilger mills, the most critical for the production of high-quality pipes is the cold-rolling stage. In the current version of of the the mill, to the operation of the main electric drive of the rolling stand using a mechanical transmission. Of the features thefeatures operation andoperation technicaland implementation of the electric of these mills, careful study ofofthe of the technical implementation of drives the electric drives of from position of the tasks set, shows to ensure thetoseparate but separate coordinated of these the mills, from the position of the tasksthe set,need shows the need ensure the but operation coordinated auxiliary mechanisms and the main drive, and the ability to work out the resulting overloads without operation of auxiliary mechanisms and the main drive, and the ability to work out the resulting significantly affecting product quality.
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