Wide strip hot rolling mill runout roll table electric drive control system
The object for the research is the electric drive of the wide strip hot rolling mill runout roll table. The goal of the research is decreasing the operational loses spent on the roll table equipment. The means for reaching the goal are the developing of the roll table equipment diagnostic system and the improved algorithm for electric drive control system. In the article the description of the performed researches and the results of developed systems applying are present.
Analysis And Development Of Electric Drives Automatic Adjustment Algorithms
The present article provides rationale for the necessity of automatic adjustment of the modern closed-loop systems of electric drives. The article gives a review of stages of the automatic adjustment and presents an experimental research of correlation between the required algorithms with real ones, which are applied in the typical industrial electric drives of different types. The characteristic of the symmetrical and modular optimums is given from the point of view of quality parameters of the electric drives control. The classification of current and speed loops adjustment in the relation to the symmetrical and modular optimums is given based on the experimental research. There are also recommendations given for improving the algorithms of the automatic adjustment for decreasing the time of commissioning the equipment.
Fundamental equations for eddy current analysis by using the A- phi method and 3-D analysis of a conducting liquid
The fundamental equation for the A- phi method is formulated using Maxwell's equations and the continuity equation for electric charge. Maxwell's equations necessarily involve the continuity equation under the assumption that the displacement current can be ignored. However, in the finite element method, an acceptable solution cannot be obtained if the continuity equation is not treated as an independent equation. The situation is clarified theoretically, and the physical significance is discussed. A model of a conducting liquid in a moving magnetic field is analyzed, and the validity of the proposed formulation is verified by experiment. >