Sensorless electric drive of the mixture supply system in the mold of the continuous steel casting installation

Abstract

The system of automatic feeding of the slag-forming mixture into the mold of the continuous casting machine was investigated in this article. The necessity of using a slag-forming mixture in the process of steel production has been substantiated. The proofs are given that the consumption of the slag-forming mixture significantly affects the cost of the final product. The quality level of the final product depends on the uniformity and consistency of the mixture supply to the crystallizer. Therefore, the actual direction is the automation of the process of feeding the slag-forming mixture into the mold of the continuous casting machine. The description of the developed automatic installation, which implements the supply of slag-forming mixture, is presented. The necessity of using a sensorless electric drive for moving the trolley has been substantiated. A simulation model of a bogie electric drive with a vector control system based on sensorless determination of the angular speed of the engine has been developed. The description of the method for determining the angular speed of the motor based on the known values of phase voltages is given. The simulation of the developed electric drive system in the Matlab Simulink program, confirming the adequacy of the developed system. The introduction of a sensorless electric drive into the system for feeding the mixture into the mold of the continuous casting machine will increase the reliability of the entire system and reduce its weight and dimensions.

A model of automated mold flux feeding into the crystallizer of a continuous casting machine

“…The level of MF is controlled by means of level sensors (L1 and L2). The device is described in detail in [13,19].…”

“…1) of the feeder (EP2 and EP3, Fig. 1), which is implemented on the basis of the system of equations (1) [19]: where u sĮ , u sȕ , i sĮ , i sȕ , ȥ sĮ , ȥ sȕ , are the voltage, current, and magnetic linkage values of the stator (s) and the rotor (r) in the fixed axes Į, ȕ; R r is rotor resistance, Ohm; L m is the main coefficient of inductance of an induction motor (magnetization inductance), Ohm; L s is stator inductance, Ohm; L r is rotor inductance, Ohm; J is a moment of inertia of the electric drive, kg•m 2 ; М, М r are a motor torque and a moment of resistance, Nm; ȡ is a number of motor pole pairs; w is motor speed, rad/s. The main feature of the model is the method of evaluating the relationship between the metal and the slag temperature difference, the screw feeder flow rate, and the thickness of the slag layer.…”

Application of a mathematical model for the Motoman MH-50 industrial robot’s electric drive system

“…The availability of inexpensive, high-performance digital signal processors with automatics allows the implementation of a novel algorithm for driving applications to execute a wide range of work, such as transferring objects and welding operations [1]. According to the given information by the International Federation of Robotics [2], there are only 4 robots per 10,000 employees in the Russian Federation. For comparison, in Korea, the number of robots reaches 710 units for the same 10 thousand employees [3].…”