scholarly journals REGULATION OF UNBALANCED ELECTROMAGNETIC MOMENT IN MUTUAL LOADING SYSTEMS OF ELECTRIC MACHINES OF TRACTION ROLLING STOCK AND MULTIPLE UNIT OF MAINLINE AND INDUSTRIAL TRANSPORT

2014 ◽  
Vol 0 (6(54)) ◽  
pp. 70 ◽  
Author(s):  
A. M. Afanasov
Keyword(s):  
Electric Machines ◽  
Rolling Stock ◽  
Electromagnetic Moment ◽  
Multiple Unit

Discussion on “The application of dynamo-electric machines to railway rolling stock”

1881 ◽  
Vol 10 (36) ◽  
pp. 114-121
Author(s):  
Alexander Siemens ◽  
C.E. Spagnoletti ◽  
Crompton ◽  
G.K. Winter ◽  
J. Munro ◽  
...  
Keyword(s):  
Electric Machines ◽  
Rolling Stock ◽  
Railway Rolling Stock

scholarly journals Electromagnetic processes of charging of on-board supercapacitor storage system during the regenerative braking mode of DC electric rolling stock with series-wound DC motors

2018 ◽  
Vol 180 ◽  
pp. 02007
Author(s):  
Anatolii Nikitenko
Keyword(s):  
Initial Conditions ◽  
Storage System ◽  
Rolling Stock ◽  
Regenerative Braking ◽  
Dc Motors ◽  
Traction Motors ◽  
Electric Rolling Stock ◽  
Electromagnetic Processes ◽  
Multiple Unit ◽  
Experimental Researches

The paper is dedicated to the task of improving of regenerative braking of a DC train with the series-wound DC traction motors. It is proposed the schematic solution for the trains with DC motors, which is based on the storing of recovered energy by the on-board supercapacitor storage system and extending the speed range of regenerative braking. The scheme is described by expressions which allowed to build the time dependences of main values. In addition, the experimental researches with the multiple-unit train were performed to find initial data for calculations and verification the results. The transient processes of charging are analyses for different cases of storage capacitances, residual voltages and initial speed of braking. It was proved, that the scheme allows to increase the value of recovered energy up to 40%, but its value strongly depends on the initial conditions and parameters of the system.

scholarly journals Brushless Electric Machines with Axial Magnetic Flux: Analysis and Synthesis

2021 ◽  
Author(s):  
Sergey Gandzha ◽  
Dmitry Gandzha
Keyword(s):  
Magnetic Flux ◽  
Computer Aided Design ◽  
Electric Machines ◽  
Engineering Practice ◽  
Flux Analysis ◽  
Electromagnetic Moment ◽  
Electromagnetic Power ◽  
Analysis And Synthesis ◽  
Aided Design

An analysis of electric machines with axial magnetic flux is given. First, the effect of commutation on the electromagnetic moment and electromagnetic power is analyzed. Two types of discrete switching are considered. The analysis is performed for an arbitrary number of phases. The first type of switching involves disabling one phase for the duration of switching. The second type of switching involves the operation of all phases in the switching interval. The influence of the pole arc and the number of phases on the electromagnetic moment and electromagnetic power is investigated. The conclusion is made about the advantage of the second type of switching. It is recommended to increase the number of phases. Next, the classification of the main structures of the axial machine is carried out. Four main versions are defined. For each variant, the equation of the electromagnetic moment and electromagnetic power is derived. This takes into account the type of commutation. The efficiency of the selected structures is analyzed. The comparative analysis is tabulated for choosing the best option. The table is convenient for engineering practice. This chapter forms the basis for computer-aided design of this class of machines.

Comparison of Designs of a Valve-Inductor Motor of an Electric Spindle Drive

2020 ◽  
Vol 63 (6) ◽  
pp. 15-20
Author(s):  
Pavel Kolpakhch'yan ◽  
◽  
Boris Lobov ◽  
Oleg Peregudov ◽  
◽  
...  
Keyword(s):  
Initial Data ◽  
Software Package ◽  
Electric Machines ◽  
Electric Machine ◽  
Flow Coupling ◽  
Electromagnetic Moment ◽  
Three Phase ◽  
Inductor Motor ◽  
The Given

When designing electric machines, in particular, the valve-inductor motor of the electric spindle drive, there is a need to compare several designs of such machines in order to choose the most rational one. Based on the given initial data and preliminary calculations, two design variants of the engine were selected: three-phase and five-phase. For each variant, the FEMM v 4.2 software package has been used to calculate optimal geometric ratios based on the maximum of the average moment value. Then, for the optimal variants of a three-phase and five-phase machine, calculations of the voltage, current, and flow coupling of the stator phase, as well as the electromagnetic moment, were performed. It is shown that in a five-phase electric machine, the total electromagnetic moment has several times lower pulsations compared to the three-phase version.

25 Kv Electrical Multiple Unit for The Kowloon–Canton Railway (British Section)

1984 ◽  
Vol 198 (1) ◽  
pp. 51-61 ◽  
Author(s):  
G J M Botham ◽  
J H McNeil
Keyword(s):  
Rolling Stock ◽  
Reliability Data ◽  
History Of ◽  
Multiple Unit ◽  
Service Experiences

The paper gives a brief history of the Kowloon–Canton Railway and outlines its modernization. The new rolling stock is described together with some service experiences. Some reliability data are given with a discussion of the need for a worldwide industry reliability standard.

scholarly journals Freight Electric Multiple-Unit Trains as an Alternative to Locomotive Traction. Comparison and Analysis

2019 ◽  
Vol 17 (3) ◽  
pp. 72-81
Author(s):  
A. A. Zaytsev ◽  
P. S. Troitskiy
Keyword(s):  
Russian Federation ◽  
Freight Transportation ◽  
International Experience ◽  
Magnetic Suspension ◽  
Rolling Stock ◽  
Multiple Unit ◽  
The Russian Federation ◽  
Comparison And Analysis ◽  
New Generation

The advantages of introduction of modular freight electric trains in comparison with freight trains using locomotive traction are described, the main prerequisites for introduction of a distributed multiple-unit freight traction are indicated. The results of comparison of the technology of transportation with traction by locomotive situated at the head of the train and by the train with self-propelled coaches, as well as the analysis of traction calculations of two types of trains are suggested. The international experience of developing freight trains with distributed traction is described.The main directions of implementation of the concept of accelerating freight transportation on the territory of the Russian Federation are noted. It is concluded that in modern conditions, when speed becomes an economic category, it is necessary to create rolling stock of a new generation (wheel and magnetic suspension), and introduction of freight trains with distributed traction becomes extremely relevant.

Simulation of thermal processes in asynchronous traction electric motor of a locomotive

2021 ◽  
Vol 2131 (4) ◽  
pp. 042088
Author(s):  
A V Grishchenko ◽  
M A Shrajber
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Thermal State ◽  
Element Model ◽  
Electric Machines ◽  
Rolling Stock ◽  
Thermal Processes ◽  
Diesel Locomotive ◽  
Asynchronous Traction Motor ◽  
Solid Works

Abstract This article analyzes the problem of increasing the reliability of AC traction electric machines installed on traction rolling stock. In the course of the study, a finite element model of thermal processes was built, and the thermal state of an asynchronous traction motor (ATED) of a diesel locomotive was studied in the Solid Works program. The basic method for studying thermal processes in ATED was the finite element method (FEM), as well as the basic equations of heat transfer and the theory of heating a multicomponent solid. The constructed finite element model of the ATED rotor of a diesel locomotive makes it possible to determine the dependence of the temperature values of the rotor elements on the current flowing through them. The obtained values of the temperature distribution of the ATED squirrel-cage rotor are recommended to be taken into account in the design, manufacture and testing of AC electric machines of diesel locomotives.

Method of implementation of electrical brake of electric trains with asynchronous traction drive in the function of automatic brake

2016 ◽  
pp. 5-17
Author(s):  
Artem Aleksandrov
Keyword(s):  
Mathematical Model ◽  
Practical Importance ◽  
Rolling Stock ◽  
Equivalent Resistance ◽  
Traction Drive ◽  
Emergency Braking ◽  
Train Speed ◽  
Multiple Unit ◽  
Catenary System ◽  
The Moment

Objective: To define the reasons, that prevent the implementation of electrical brake for multiple unit rolling stock (MVPS) with asynchronous traction drive as an automatic brake (emergency brakes). To find the method for eliminating of found reasons. To determine, using mathematical simulation, the time indexes of traction drive readiness to the electrical braking in case of no voltage in catenary system. Methods: Mathematical model of traction drive is built in Matlab Simulink software. By using this model the empirical relations of the time from the moment of command input, made by the control system, to start an emergency braking, to the moment of charging of input capacitors to nominal voltage (in case of no voltage in catenary system) from the train speed and equivalent resistance of stator circuit were obtained. Results: The problems, preventing the implementation of electrical brake for MVPS as an automatic brakes, are examined. The methods of solving these problems are suggested. By using the mathematical model the principal possibility of suggested methods is presented, as well as the estimation of the time of traction drive preparing for readiness for braking, depending on the train speed and equivalent resistance of stator circuit. Also, the engineering solutions, are found, that allow to implement the electrical brake for multiple unit rolling stock as an automatic one. Practical importance: Electrical for brake multiple unit rolling stock with asynchronous traction drive has several benefits in comparison with the pneumatic brake. It provides smaller braking distance, not influenced by low temperatures and provides better resistance for sliding and skidding. Implementation of electrical brakes for multiple unit rolling stock in the function of automatic brake will positively influence on the safety of operation and will allow to increase the operating speed of multiple unit rolling stock.

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