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Motor Temperature Observer for Four-Mass Thermal Model Based Rolling Mills.
Boris M Loginov1, Stanislav S Voronin1, Roman A Lisovskiy1
1Department of Automation and Control, Moscow Polytechnic University, 38, Bolshaya Semyonovskaya Str., 107023 Moscow, Russia.
Developing on-line temperature monitoring for rolling mill synchronous motors is crucial. A new digital shadow observer ensures reliable operation of these expensive, high-power drives, confirming satisfactory motor condition.
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Area of Science:
- Engineering
- Materials Science
- Industrial Automation
Background:
- Thermal control of rolling mill motors is critical for processing advanced steel grades.
- Digital IIoT technologies enhance diagnostic monitoring capabilities.
- Synchronous motors in modern rolling mills are expensive, and their reliability directly impacts plant output.
Purpose of the Study:
- To develop an urgent on-line temperature monitoring system for synchronous motors in plate mill 5000.
- To implement a digital shadow (coordinate observer) for continuous temperature monitoring.
- To address modern reliability requirements for stator, rotor windings, and iron core temperatures.
Main Methods:
- Developed a thermal state observer using a four-mass model of motor heating in MATLAB Simulink.
- Utilized Simscape Thermal Models library for the thermal model.
- Performed virtual adjustment via hardware-in-the-loop (HIL) simulation.
- Validated results by comparing observer data with actual measurements.
Main Results:
- Presented a novel method for calculating thermal loads from rolling data.
- Studied discrete mass heating and analyzed stator/rotor winding temperatures during rolling cycles.
- Confirmed satisfactory thermal condition of upper and lower roll synchronous motors.
Conclusions:
- The developed digital shadow observer enhances the reliability of industrial electrical equipment.
- The research introduces technologies that improve rolling mill electrical drive reliability, contributing to metallurgical innovation.
- Recommendations are provided for broader industrial application of these findings.