Golubtsova Evgeniya

Abstract on a theme of master's work

1. 1.Urgency of a theme of work
2. 2.Purposes and problems, planned practical results
3. 3.Own results
1. 3.1.Virtual stand on research of two-planimetric system of subordinated regulation of speed of electric drive of a direct current
2. 3.2.Virtual stand for research of system of vector control by asynchronous engine
4. 4.Conclusions
5. 5.List of used literature

Work urgency is provided with necessity of introduction of new methods and means for educational process for the purpose of improvement of quality of preparation of experts-electromechanics, especially in conditions of remote and correspondence course.

Basic feature of higher technical education is necessity for organisation and carrying out of effective laboratory practical work on is professional-focused and special disciplines. This necessity has caused creation of virtual laboratory complex which corresponds to real physical laboratory stand [1]. One of the most suitable software packages for working out of such virtual stands — software package LabVIEW having rather convenient user interface and powerful tools of graphic programming. LabVIEW (Laboratory Virtual Instrument Engineering Workbench) allows to develop the applied software for organisation of interaction with measuring and operating equipment, gathering, processings and information display and results of calculations, and also modelling both separate objects, and automated systems as a whole [2].

Taking into account advantages of mathematical modelling by means of package LabVІEW there was a task in view of creation of virtual laboratory on research of typical systems of electric drive which allows to spend comprehensive investigation of questions of theory of electric drive and control systems electric drives that is expedient from methodical point of view [3].

Purposes and work problems are reduced to the following:
• • Creation of virtual models of elementary devices;
• • Working out of the concept of creation of virtual model of stands on research of systems of electric drive;
• • Studying of simulars of systems of software package LabVIEW;
• • Research of workers and emergency operation of work of systems of electric drive by means of virtual stands.

Planned practical results are virtual stands on research of following systems of electric drive:
• • System of subordinated regulation of speed of electric drive of a direct current;
• • System of a vector speed control of asynchronous engine;
• • System of a vector speed control of synchronous engine with constant magnets.

By working out of virtual stands experience of modelling of systems of electric drive by means of program Simulink which has been transferred in LabVIEW taking into account features of this package and in particular its library Control Design and Simulation has been applied. Basic features of working out of virtual laboratory stands consist in preservation of functional properties of the concrete labware which is applied in laboratories to all elements of control and protection which enter into the stand. It allows to apply virtual stands, first, to preliminary studying by students of the device and sequence of work with equipment before transition to a practical part on the real equipment, secondly, as methodical tool at remote learning [3].

Investigated skeleton diagramme of electric drive is resulted on fig. 1.

Figure 1 — Investigated skeleton diagramme of the electric drive

Appearance of stand is resulted on fig. 2 [4].

Figure 2 — Appearance of laboratory stand

Appearance of the forward panel of the virtual stand developed in the environment of package LabVIEW, is presented on fig. 3 (values are reflected in virtual oscillographs and stand devices and the schedules received as a result of performance of one session of modelling of a regular operation mode) [5].

Figure 3 — Appearance of forward panel of virtual stand.
Animation: 7 shots, 7 cycles of repetition, 140 KB

Function chart of system of vector control by asynchronous engine is presented on fig. 4.

Figure 4 — Function chart of system of vector control by asynchronous engine

Synthesis of transfer functions of regulators carry out on basis of simplified skeleton diagramme (fig. 5).

Figure 5 — Skeleton diagramme of system of vector control by asynchronous engine

General view of laboratory stand is presented on fig. 6 [6].

Figure 6 — General view of laboratory stand

Appearance of forward panel of virtual stand developed in the environment of package LabVIEW, is presented on fig. 7 (values are reflected in virtual oscillographs and stand devices and schedules received as a result of performance of modelling of any regular operation mode). [7]

Figure 7 — Appearance of forward panel of virtual stand

At the given stage two following virtual stands in the environment of LabVIEW are developed:
• • Virtual stand on research of two-planimetric system of subordinated regulation of speed of electric drive of a direct current;
• • Virtual stand for research of system of vector control by asynchronous engine.

As well as it was planned, received virtual stands keep functionality of real laboratory installations, but are more technological in respect of research of wide scale of operation modes of systems of electric drive. It is important to notice that now the given virtual stands are in a stage of continuous perfection.

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