Studying Characteristics of Traction Induction Motors for Variable-Speed Mine Electric Locomotive

The analysis of torque-speed characteristics of induction motors has been carried out in order to choose the base design for variable speed traction electric drives of underground mine electric locomotives. For constant dimensions of active part of series-produced electric motors the influence of the diverse conductivity’s materials for manufacturing the squirrel-cage rotor on speed-torque and speed-current characteristics. The designs are compared according to speed-up dynamics, power indexes and key design features of the studied electric motors.

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Limitation of Inrush Currents in Electric Drives Containing Induction Motors with a Squirrel-Cage Rotor

Elektrichestvo ◽

10.24160/0013-5380-2020-2-22-26 ◽

2020 ◽

Vol 2 (2) ◽

pp. 22-26

Author(s):

MukimV. SHAMSIYEV ◽

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ABDULKERIMOV Sagit A. ABDULKERIMOV ◽

Abduvakhob M. SHAMSIYEV ◽

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...

Keyword(s):

Induction Motors ◽

Electric Drives ◽

Squirrel Cage ◽

Inrush Currents ◽

Cage Rotor

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Comparative Study of Energy Consumption and CO2 Emissions of Variable-Speed Electric Drives with Induction and Synchronous Reluctance Motors in Pump Units

Mathematics ◽

10.3390/math9212679 ◽

2021 ◽

Vol 9 (21) ◽

pp. 2679

Author(s):

Victor Goman ◽

Vladimir Prakht ◽

Vadim Kazakbaev ◽

Vladimir Dmitrievskii

Keyword(s):

Co2 Emissions ◽

Induction Motors ◽

Electricity Consumption ◽

Electric Motors ◽

Variable Speed ◽

Pump Unit ◽

Electric Drives ◽

Power Drive ◽

Design And Manufacturing ◽

Drive Systems

This study carried out a comparative analysis of indicators of electricity consumption and CO2 emissions for four-pole induction motors (IMs) of efficiency classes IE3 and IE4 with a rated power of 2.2–200 kW in a variable speed pump unit. In addition, innovative IE4 converter-fed synchronous reluctance motors (SynRMs) were evaluated. The comparison was derived from the manufacturer’s specifications for the power drive systems (PDSs) at various rotational speeds and loads. The results showed that the emission indicators for IE3 class motors were significantly worse compared with IE4 class motors for low power ratings, which make up the vast majority of electric motors in service. This justifies expanding the mandatory power range for IE4 motors to at least 7.5–200 kW or even 0.75–200 kW, as it will dramatically contribute to the achievement of the new ambitious goals for reducing greenhouse gas emissions. In addition, the operational advantages of IE4 SynRMs over IE4 IMs were demonstrated, such as their simpler design and manufacturing technology at a price comparable to that of IE3 IMs.

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Mathematical modelling of starting modes of induction motors with squirrel-cage rotor

Electrical Engineering & Electromechanics ◽

10.20998/2074-272x.2021.2.02 ◽

2021 ◽

pp. 9-15

Author(s):

V. S. Malyar ◽

O. Ye. Hamola ◽

V. S. Maday ◽

I. I. Vasylchyshyn

Keyword(s):

Mathematical Modelling ◽

Induction Motors ◽

Static Characteristics ◽

Coordinate Systems ◽

Two Phase ◽

Electric Drives ◽

Squirrel Cage ◽

Three Phase ◽

Rotor Winding ◽

Cage Rotor

Purpose. Development of methods and algorithms for calculation of starting modes of the induction motors with the squirrel-cage rotor. Methodology. Mathematical modelling of starting modes of asynchronous electric drives in various coordinate systems with the use of numerical methods for solving boundary problems for systems of differential equations and nonlinear systems of final equations and calculation with their use of static characteristics. Results. Methods and algorithms for numerical analysis of the starting modes of asynchronous electric drive have been developed, which make it possible to calculate the static characteristics and transients in fixed three-phase and orthogonal two-phase coordinate systems. Academic novelty. Known in the literature methods of calculation of starting modes have in their basis classical equivalent circuits with different approximate methods of calculating the parameters taking into account the saturation of a magnetic core and current displacement in a rotor winding. This approach requires a special solution of the adequacy problem for each problem. The methods described in the article for the saturation accounting use real magnetization characteristics of the main magnetic flux and leakage fluxes separately, and the skin effect phenomenon is taken into account by representing the squirrel-cage rotor winding as multilayer. Such mathematical model of the motor is universal and makes it possible to take into account the saturation and current displacement in any dynamic mode, including the start-up process. Mathematical models developed on the basis of the proposed methods provide the adequacy of results with a minimum amount of calculations and make it possible to perform optimization calculations. Practical value. Created on the basis of developed algorithms calculation programs allow to carry out with high reliability calculation of starting modes both in three-phase and two-phase axes of coordinates that gives the chance to analyze not only symmetric, but also asymmetric modes and to predict special features of functioning of system of the electric drive in the set technological conditions of operation and to form requirements to development and adjustment of starting systems with the purpose of maintenance of power effective and reliable operation of system of asynchronous electric drives.

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