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A mechanical vibration has a harmful influence on the strength of equipment and disrupts the technological process. For example, the radial run out of the rolling stand drive spindle leads to vibration during the operation of the spindle. It is results in lower the quality of rolling and the bearings heating. An accident analysis at hot rolling mills revealed that 85 per cent of the accidents are...
The article deals with the impact load decrease methods by the example of a rolling stand electric drive of a hot plate mill 5000 OJSC “Magnitogorsk Iron & Steel Works”. The mathematical description of a synchronous motor, which is used to rolling stand, has been provided. A simulation model was developed based on the mathematical description of the synchronous motor. This model is carried out...
In the article is devoted to electromagnetic compatibility (EMC) analysis of 18-pulse AC-DC circuit consisting of three level active front end (AFE) rectifiers based on a pulse width modulation selective harmonic elimination (PWMSHE) method with three switching angles for quarter-period. 18-pulse AC-DC circuit is made as a parallel connection of three power transformers which have the secondary winding...
The main types of hydraulic cylinders as actuators mechanisms. The differences in the cylinders with single and double stem were given. The simplest scheme of hydraulic drive was composed, moving objects with a mass. For the control valve the equation of static characteristics was obtained, associated fluid flow with control signal. The results were compared with the real object. According to the...
This paper addresses the simulation modeling of the rolling mill stand 5000 OJSC MMK. The main purpose is to simulate a synchronous. The close loop control system of the synchronous drive was made. The modeling results were simulated by the Matlab/Simulink program. The result modeling of the rolling mill stand 5000 were carried out at the difficult-to-form steel grade X70 in the range of roughing...
The article deals EMC research of 18-pulse circuit consisting of three level neutral point clamped (3L-NPC) converters with selective harmonic elimination (SHE) algorithm. Main object of research is power circuit of wind-driven electric plants based on 18-pulse circuit consisting of three 3L back-to-back (BtB) converters. A review of contemporary condition of power electronics for application in wind...
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