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The paper presents the reconstruction and modernization of the tangent rewinder performed in the board factory "Umka", near Belgrade, Serbia. The reconstruction included partial reconstruction of the mechanical part, integration of the new system for slitting paper web in longitudinal direction, and complete replacement of the electrical drive and control system. With the proper connection...
This paper presents the development of a simulation model of a matrix converter drive with the aim to diagnose faults in the converter. Using a model developed in Simulink environment, simulation results were obtained demonstrating that the occurrence of an open-circuit fault in one of the power switches of the matrix converter affects heavily the operation of the motor, leading to appearance of high...
Modern information and communication technologies have changed the concept of conducting laboratory experiments and learning the theories behind them. New terms like ldquodistant learningrdquo, ldquoremote laboratoriesrdquo, ldquovirtual learning environmentsrdquo etc have emerged. To follow the mainstream and improve practical aspects of given education, the TUT has started designing its own remotely...
VSD's are often judged as much less reliable compared to DOL operation of motors. This paper discusses that most failures that contribute to the (bad) image of VSD's are related to specification and engineering, rather than to the drive itself. As a matter of fact, the usage rate of drives in chemical industry is far below the usage rate of drives in other industries (3% vs. >8%). Because failures...
Travel drive on open pit mine machines is multi-motor drive, consisting of two, four, six or more motors. This drive is the most demanding drive on the open pit mining machines. The single drives are cross-coupled through terrain, which is rugged and inhomogeneous, making the quasi-stiff mechanical coupling. This is the reason why the relation of coupling between the individual drives permanently...
Following a brief review of the problems arising in the design of dc machines for maximum ratings, the cycloconverter-fed synchronous and asynchronous rotating-field machines with field-oriented control as interesting alternatives to the dc drives will be described. The mode of operation of the cycloconverter is discussed in brief, followed by a description of the principle of field orientation by...
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