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Date submitted1990-11-29
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Date accepted1991-01-24
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Date published1991-12-29
Calculation on the computer by the finite element method of stresses in the massif during cutting
The nature of rock fracture under the action of the cutter depends on the stresses in the area of their concentration in the massif, determined by its outlines and the applied force. In the process of cutting the boundaries of the array, the magnitude and angle of the applied force with the contact site change.
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Date submitted1990-11-19
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Date accepted1991-01-25
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Date published1991-12-29
Investigation of the mathematical model of the dynamic system "combine-bottom-hole" on the computer
- Authors:
- E. A. Zagrivny
- Yu. N. Smirnov
- G. G. Levin
The calculation model of the dynamic system "combine - face" with uncorrected and corrected feed systems can be represented by the following systems of equations.
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Date submitted1990-11-08
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Date accepted1991-01-20
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Date published1991-12-29
Machine harmonic analysis of periodic control and disturbing influences of electric drives
- Authors:
- V. V. Alekseev
- V. V. Rudakov
For machine harmonic analysis of periodic functions on the EC computer is designed standard FORIT subroutine in the Fortran language.
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Date submitted1990-11-12
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Date accepted1991-01-25
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Date published1991-12-29
Multi-motor electric drive TP-D with common current loop of subordinate regulation
- Authors:
- V. V. Rudakov
Multi-motor drives according to the scheme TP-D with a common current loop with series connection of motor armatures are widely used in turning mechanisms of excavators, overhead cranes, etc.
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Date submitted1990-11-07
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Date accepted1991-01-06
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Date published1991-12-29
Application of "DISPAS" program for computer calculation of characteristics of three-circuit systems of DC electric drives
- Authors:
- A. E. Kozyaruk
- V. V. Rudakov
The program "DISPAS" is developed in the Moscow Aviation Institute and allows to form a program of calculation on the computer on structural schemes of the investigated objects.
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Date submitted1990-11-26
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Date accepted1991-01-13
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Date published1991-12-29
Current control circuit of thyristor drive with differential correction and PI-corrector
- Authors:
- V. V. Rudakov
The current regulator in the loop with differential correction realizes the regulation of the loop current and self-adjustment of the circuit.
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Date submitted1990-11-21
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Date accepted1991-01-16
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Date published1991-12-29
Application of thyristor rectifiers in bridge excitation schemes of excavator generators
Development and introduction of thyristor excitation for electric drives of excavators on G-D system is an important task, the solution of which in our country, unfortunately, unacceptably delayed.
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Date submitted1990-11-24
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Date accepted1991-01-13
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Date published1991-12-29
Principles of construction and algorithms of microprocessor control systems of electric drives
- Authors:
- A. A. Kozyaruk
- T. O. Rosso
Control systems of electric drives - complex multifunctional and multiparameter - are characterized by application of several (on number of parameters or performed functions) local systems of regulation and control.
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Date submitted1990-11-27
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Date accepted1991-01-13
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Date published1991-12-29
Mathematical model of AC machine with magnetic saturation
- Authors:
- V. A. Dartau
A mathematical model of an alternating current machine is considered, which makes it possible to take into account the effect of saturation of the magnetic target in transient and steady-state modes.
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Date submitted1990-11-05
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Date accepted1991-01-29
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Date published1991-12-29
Transients in alternating current electric machines with magnetic saturation
- Authors:
- V. A. Dartau
Consideration of the saturation of the magnetic system of an electric machine in transient processes can be carried out, relying on the system of differential equations describing the electrical equilibrium of the windings of the phases of the machine.
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Date submitted1990-11-01
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Date accepted1991-01-13
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Date published1991-12-29
Direct frequency converter with capacitive energy storages
- Authors:
- A. V. Shipulin
Existing direct frequency converters (DFC) and frequency converters with a constant current link (FC with DCT) have a number of disadvantages (for DFC - low cosφ, dependent on the power factor of the load, the need to use equalizing chokes or elements to form pauses in the output voltage at joint or separate control, pulsations of the output current form; for FC with DCT - unreliability of two-operation thyristors, complexity of switching thyristors, low efficiency, etc.).
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Date submitted1990-11-19
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Date accepted1991-01-08
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Date published1991-12-29
Regeneration in DC link frequency inverters without slave inverter application
- Authors:
- A. V. Shipulin
To implement energy recovery to the network in static frequency converters with a DC link containing a voltage inverter, an inverter driven by the network is used.
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Date submitted1990-11-01
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Date accepted1991-01-01
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Date published1991-12-29
Device for determining the coordinates of an AC machine
- Authors:
- A. P. Emelyanov
- Z. B. Sleptsova
To increase the possibilities of application of alternating current electric drives with various control systems, including those mechanisms where the installation of a tachogenerator is inadmissible or undesirable, the Department of Electrical Machines and Automated Drive of LMI has developed a device that allows indirectly determine the speed of rotation, as well as the components of the stator and rotor flux-coupling of the induction motor (IM).
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Date submitted1990-11-10
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Date accepted1991-01-12
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Date published1991-12-29
Application of microcomputers in calculation of parameters of multiplication blocks for vector-controlled electric drives
- Authors:
- V. V. Alekseev
The specialized multiplier for vector control systems of frequency drives offers extended functionality due to additional inputs, low zero level drift and minimum input signal error rate.
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Date submitted1990-11-15
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Date accepted1991-01-27
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Date published1991-12-29
Digital and digital-analog vector filter for frequency-controlled vector-controlled drives
- Authors:
- T. O. Rosso
In transvector-controlled variable frequency drives, the fundamental harmonics of the motor flux or motor voltage/current are required to generate the frequency inverter control signals.
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Date submitted1990-11-17
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Date accepted1991-01-06
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Date published1991-12-29
Energy characteristics of synchronous machines in vector control systems
- Authors:
- T. O. Rosso
- V. N. Yazev
The possibilities of controlling different current coordinates of variable current machines presented by vector control systems can be used to control the main energy characteristics of the drive, such as power factor and efficiency.
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Date submitted1990-11-06
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Date accepted1991-01-08
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Date published1991-12-29
AC drive control with power constancy
- Authors:
- E. V. Raspopov
The principle of transvector control of AC drives has found wide application both in foreign and domestic practice.
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Date submitted1990-11-12
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Date accepted1991-01-22
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Date published1991-12-29
Control system of electric drive THR-AD with Microcomputer
When organizing the control of the drive thyristor frequency converter - induction motor (TFC-AD) with sufficiently high speed, wide range of speed control and good economic indicators it is necessary on the basis of information about the coordinates of the AD state to form control actions on the frequency and voltage channels of TFC in accordance with certain algorithms.
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Date submitted1990-11-09
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Date accepted1991-01-28
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Date published1991-12-29
Experimental studies of adjustable asynchronous electric drive for exploration drilling machines
The development of theory and practice of adjustable AC electric drives on the basis of valve frequency converters contributes in recent years to the wide implementation of such drives in various industries.
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Date submitted1990-11-10
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Date accepted1991-01-11
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Date published1991-12-29
Control system of the frontal coal mining unit module
The principle scheme of the unit of modular design for frontal mining of coal seams was developed at the Department of Mining Electromechanics of the branch of LMI in Vorkuta.
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Date submitted1990-11-22
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Date accepted1991-01-03
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Date published1991-12-29
Calculation of the air pipelines of the mine compressor unit on the computer
- Authors:
- V. V. Klassen
- S. S. Smorodin
The application of computer facilities for solving engineering and scientific problems causes the need to develop standard algorithms, programs, information support of tasks.