scholarly journals Frequency-adjustable electric drive for energy saving and optimization of technological processes in electrical complexes

2019 ◽  
Vol 21 (5) ◽  
pp. 59-70 ◽  
Author(s):  
V. R. Ivanovа ◽  
I. N. Kiselev
Keyword(s):  
Energy Saving ◽  
Electric Drive ◽  
Supply Voltage ◽  
Frequency Converter ◽  
Complete Analysis ◽  
Water Supply Systems ◽  
Technological Processes ◽  
Frequency Converters ◽  
Insulated Gate Bipolar Transistor ◽  
Electronic Frequency

The relevance of the study lies in the search for energy-saving technologies. So, at present, the most common type of electric drive in industry is asynchronous, most of which are unregulated. Replacing an unregulated electric drive with an adjustable one in various units can significantly reduce energy consumption, increase the life of the mechanical part of the drive and improve the quality of the adjustable process parameter. The replacement consists in installing an electronic frequency converter between the network and the motor of the device. This device changes the rotational speed of the motor rotor by changing the frequency and amplitude of the supply voltage. The most common are frequency converters with an intermediate DC link. Such devices are built on electronic keys, which are made on IGBT (Insulated Gate Bipolar Transistor) transistors. Using the NI Multisim14 software, a model was created to determine power savings during the implementation of VFD.The paper gives the rationale for the introduction of a frequency-controlled electric drive (VFD) to optimize technological processes in electrical complexes and systems, in particular, a complete analysis of the energy efficiency of VFD application in pumped water supply systems is presented as an example. The calculation of its economic efficiency for a particular installation is also given.

scholarly journals Two-way conductivity converters in the technology of tire cord rubberization

2020 ◽  
Vol 220 ◽  
pp. 01069
Author(s):  
Rishat Ganiev
Keyword(s):  
Energy Efficiency ◽  
Computer Simulations ◽  
Electric Drive ◽  
Production Line ◽  
Energy Recovery ◽  
Frequency Converter ◽  
Tire Cord ◽  
Electric Drives ◽  
Frequency Converters ◽  
Cord Production

The article deals with the problems of increasing the multi-engine electric drive energy efficiency on the example of the cropped cord production line in manufacture of tires. There are requirements for line electric drives that can have an impact both each other and the overall power grid in the mode of technological braking, as well as the requirements for the availability of protection functions and mutual coordination with the mains supply. To solve this problem, options have been developed to build reversible frequency converters on fully controlled (locked) keys as part of frequency-regulated technological electric drives in the production of cord for car tires with energy recovery. The construction of the reversible frequency converter with the use of autonomous voltage inverters, as well as the results of computer simulations in the reactor and non-reactor circuits of reversible frequency converters in the composition of multi-motor electric drives with a total DC bus are shown.

Determination of Global Efficiencies of Variable Speed Pumps within Water Supply Systems

2018 ◽  
Vol 20 (1) ◽  
pp. 81-88
Author(s):  
Daniel Toma ◽  
Cristina-Mihaela Vîrlan ◽  
Nicolae Marcoie
Keyword(s):  
Water Supply ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Water Supply Systems ◽  
Variable Speed ◽  
Frequency Converters ◽  
City Water ◽  
Variable Speed Motor ◽  
Supply Systems

Abstract The energy transformations involved in the operation of the pumping installations are carried out by pumping aggregates consisting of an electric motor and a pump. In order to provide a full adaptation to the users’ variable demands, variable speed motor driven pumps are used on networks (such motors being equipped with frequency converters). The paper presents a method for determining the global efficiency of a frequency converter-asynchronous motor-pump group. The method has been implemented at the Chiriţa Pumping Station, main facility within the Iasi City water supply system.

ENERGY-SAVING MODE OF OPERATION OF THE ELECTRIC DRIVE OF THE OIL CROPS CHOPPER

2019 ◽  
Vol 5 (1) ◽  
pp. 8-12
Author(s):  
Matkarim Ibragimov ◽  
◽  
Gulnoz Ergasheva
Keyword(s):  
Energy Saving ◽  
Electric Drive ◽  
Oil Crops ◽  
Mode Of Operation ◽  
Saving Mode

SIMULATION OF SOFT START OF SYNCHRONOUS ELECTRIC DRIVES

2019 ◽  
Author(s):  
Shakhboz Dadabaev
Keyword(s):  
Computer Simulation ◽  
Electric Drive ◽  
Water Supply Systems ◽  
Factors Affecting ◽  
Electric Drives ◽  
Soft Start ◽  
Simulation Results ◽  
Pumping Units ◽  
Negative Factors ◽  
Supply Systems

The main negative factors affecting the starting modes of synchronous electric drives of pumping units of irrigation water supply systems were identified, computer simulation of direct and soft start of synchronous electric drive was made, the simulation results are shown in graphs and a brief conclusion was made on the study.

scholarly journals Insulation Life Span of Low-Voltage Electric Motors—A Survey

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1738
Author(s):  
Vanessa Neves Höpner ◽  
Volmir Eugênio Wilhelm
Keyword(s):  
Life Span ◽  
Electric Motor ◽  
Low Voltage ◽  
Frequency Converter ◽  
Rate Of Change ◽  
High Rate ◽  
Switching Frequency ◽  
Electric Motors ◽  
Frequency Converters ◽  
High Switching Frequency

The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial discharges between conductors, causing degradation of the insulation of electric motors. Understanding the effects resulting from the frequency converter–electric motor interaction is essential for developing and implementing insulation systems with characteristics that support the most diverse applications, have an operating life under economically viable conditions, and promote energy efficiency. With this objective, a search was carried out in three recognized databases. Duplicate articles were eliminated, resulting in 1069 articles, which were systematically categorized and reviewed, resulting in 481 articles discussing the causes of degradation in the insulation of electric motors powered by frequency converters. A bibliographic portfolio was built and evaluated, with 230 articles that present results on the factors that can be used in estimating the life span of electric motor insulation. In this structure, the historical evolution of the collected information, the authors who conducted the most research on the theme, and the relevance of the knowledge presented in the works were considered.

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