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In the paper it is presented a designing algorithm for decoding the data provided by a two-channel incremental encoder in order to identify the rotation direction. Such information is useful when monitoring the operation status of various driving devices found within a vehicle. The resulting digital circuit is implemented on a FPGA (Field-Programmable Gate Array), which can be easily included as a...
In this paper is presented a statistical analysis of the sound power emitted by power transformers. The power of the analyzed transformers within this analysis is greater than 6 MVA in no-load operation when the cooling system is turned off. Using this statistical approach the complex multiphysics problem of estimating the transformer sound power is greatly simplified.
The paper aims to study which type of orifice type (round or square) is more efficient for an induction motor fan cowl, in order to obtain an increased air flow rate. The analysis begins from an already existing fan cowl (with square orifices) and it is shown that it is possible to improve the air flow rate. The chosen efficiency parameter is the flow coefficient, which is calculated using computational...
The paper presents the opinions of students at the Electrical Engineering, University POLITEHNICA of Bucharest (UPB) regarding the teaching and assessment methods. The students' opinions depend on various socio-demographic variables discussed. The study is based on a quantitative analysis and it was conducted on 844 students studying Electrical Engineering, during May–July 2016.
In the industry, prototyping is an unavoidable step. The three-dimensional (3D) models of prototypes are relatively easy to develop with the help of dedicated 3D software. The difficulties step in when the prototypes have to physically be manufactured. Moreover the manual prototyping is time consuming, expensive and sometimes requires specialized crafting in order to obtain alike parts that would...
This paper presents a Computer-Aided Design method for a three phase power transformer using MATLAB programming environment. The considered transformer is Oil Natural Air Natural cooling system type. During the designing by changing the value of just one single variable implies to recalculate everything. Such operation is time consuming but this drawback can be overcome by fully automating the design...
This paper presents a control method for an advanced electrical drive system for transportation, namely an elevator. For cost efficiency the control is performed with the simplest appropriate PLC. Thus, the software code was wisely developed to be fast and small size. Starting from an educational platform, which models a two floor elevator using a DC electrical drive, different sensors types and a...
The restructuring and the reorganization of the educational teaching system has comprehended not only the academic teaching curriculum and management system but also the teaching methods. Educational platforms and virtual laboratories are increasingly becoming a key component during the teaching process especially for technical teaching. Although the existence of virtual laboratories and e-learning...
Industrial automation is constantly expanding, and, regarding their control more and more solutions are presently developing on the market. These include older methods like Petri nets (1966), and standardized languages, which are commonly used in the field of programmable logic controllers (PLCs). The paper presents the Ladder Diagram programming language, that is one of the standardized languages,...
Within electric drives in industrial area and beyond the permanent magnet synchronous machines (PMSM) are increasingly and widely used. This type of machines offer several advantages compared to squirrel-cage induction machines that are replaced in many electric drives types. Some of these advantages are the increased power density, require similar control methods to induction machines and not lastly...
In this paper it is presented the possibility of how can be applied and with which advantages the method of Petri Nets in designing of a control unit for electrical drives. With the help of Petri Nets, it is more simple and adequate to have a complete description of an industrial process and to analyze how an electric drive system behaves for different applied conditions or with different functioning...
The paper presents a study on the losses developed into the mechanical reinforcing system's parts of the three-phase power transformers. These losses are obtained based on the electromagnetic field near the parts. The electromagnetic field is computed using a 3D finite element method. It is also studied the influence of the magnetic permeability of the material that these parts are made of over the...
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