Analysis of the Load Conditions of the Rolling Mill Stand Electric Motors
DOI:
https://doi.org/10.24160/0013-5380-2026-8-53-64Keywords:
rolling mill, load conditions, electric motor, torque, temperature, analysis, technique, simulation, experimental studies, validationAbstract
During the operation of heavy plate rolling mills, the range of manufactured products is gradually expanded. In most cases, this is accompanied by an increase in the loads on the electrical equipment, specifically, motor torques and currents. This predetermines the relevance of monitoring the load conditions of the motors of Type 5000 plate mills, which are the main facilities producing billets for making large-diameter pipes. The electric drives of the upper (UMD) and lower (LMD) work rolls of the horizontal stands of these mills are made by individual designs; when different speeds are set, their loads can differ by several times. This leads to an increase in the temperature of the more heavily loaded motor and a reduction in the service life of its insulation. For indirectly assessing the thermal state, it is proposed to use, along with RMS (equivalent) torques and currents, their average values. This is because the conventional approach based on constructing load diagrams has limitations regarding the analyzed cycle duration. Using the example of electric drives in a heavy plate mill reversible stand, the article provides experimental confirmation of the feasibility of monitoring the average loads of motors. An observer (calculator) of UMD and LMD loads based on the torque and current values measured during rolling has been developed. The results of torque reconstruction over a long-time interval are presented, and their validation was performed, which has confirmed the feasibility of applying the developed equivalencing technique. Recommendations on implementing the calculator at existing rolling mills are given.
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