scholarly journals Study of the two-rotor electric motor of a drive of vehicle drive wheels

2021 ◽  
Vol 60 (4) ◽  
pp. 245-257
Author(s):  
Nikolai Sergienko ◽  
Valeriy Kuznetsov ◽  
Borys Lyubarsky ◽  
Mariia Pastushchina ◽  
Piotr Gołębiowski ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Electric Motor ◽  
Mechanical Characteristics ◽  
Specific Weight ◽  
Ecological Problem ◽  
Vehicle Speed ◽  
Harmful Emissions ◽  
Technical Solutions ◽  
The Given ◽  
Equivalent Diagram

In recent years, electric and hybrid vehicles have taken more and more attention due to their apparent advantages in saving fuel resources and reducing harmful emissions into the environment. Even though electric vehicles can solve the ecological problem, their operation is faced with a number of inconveniences associated with a limited driving distance from a single charge due to limited storage of energy from an independent power source and a lack of the required service and repair infrastructure. In hybrid and electric vehicles one of the main parameters is the curb weight, which affects energy consumption, vehicle speed, stability, controllability and maneuverability. In this regard, leading car manufacturers use parts with a low specific weight (non-metallic, aluminum alloys, etc.) in the design and also exclude some units from the design. Due to these technical solutions, the vehicle's operating is improved. One of the groups of parameters to be defined when designing a new electric vehicle is the parameters relating to the electric motor. The purpose of the article is determination of the mechanical characteristics of a two-rotor electric motor during magnetic flux control and assessment of the possibility of organizing the drive of the drive wheels of the vehicle. The electric motor has two mechanically independent outputs. For the study, an electrical equivalent diagram has been developed for the given two-rotor electric motor. A simulation model of the equivalent diagram has been built. Simulating the interaction processes of the rotors with the stator made it possible to obtain data for building the mechanical characteristics for each output of the electric motor. Analysis and processing of the mechanical characteristics data of the electric motors showed the conformity and the range of changes in the torque on each of the rotors when changing their slip and revolution, which are required when building algorithms for the operation of electric motor control systems as part of drives for various purposes. Analysis of the simulation results made it possible to assess the possibility of using the considered two-rotor electric motor for the drive of drive wheels in an electric and hybrid wheeled vehicle.

scholarly journals Analysis of the E-Bus Berlin project

2018 ◽  
Vol 19 (1-2) ◽  
pp. 43-47
Author(s):  
Kamil Pędziwiatr ◽  
Marcin Pędziwiatr
Keyword(s):  
Noise Reduction ◽  
Electric Vehicles ◽  
Public Transport ◽  
Charging System ◽  
Electric Bus ◽  
Harmful Emissions ◽  
Environmental Balance ◽  
Technical Solutions

The E-Bus project was launched in August 2015 in Berlin should contribute to reduction of harmful emissions, noise reduction and development of the electric bus market in the area of Berlin and Brandenburg. This article discusses the first electric bus line in the capital of Germany, which was based on the use of various technical solutions. Two basic groups of such solutions were taken into account – the use of the Solaris Urbino 12 electric bus and the Bombardier Primove inductive charging system. The advantages of using electric vehicles in public transport in Berlin were also discussed. The presented issues were based on the environmental balance of the E-Bus Berlin project.

scholarly journals Building a Model of Integration of Urban Sharing and Public Transport Services

2021 ◽  
Vol 13 (6) ◽  
pp. 3086
Author(s):  
Marcin Jacek Kłos ◽  
Grzegorz Sierpiński
Keyword(s):  
Decision Making ◽  
Public Transport ◽  
Urban Transport ◽  
Extensive Literature ◽  
Transport Services ◽  
Harmful Emissions ◽  
Specific Factors ◽  
The Given ◽  
Public Transport Services ◽  
Potential Area

The intense growth of cities affects their inhabitants to a considerable extent. The issues facing the traveling population include congestion and growing harmful emissions. Urban transport requires changes towards eco-friendly solutions. However, even though new forms of traveling (sharing services) are being implemented, their integration with public transport remains problematic. On account of the large number of available services combined with the absence of their integration, city inhabitants are faced with the dilemma of choosing between one or several transport modes which would enable them to make the given trip. The main goal of this article is to propose a model for integration of different transport services which could support those who intend to travel in the decision-making process. Therefore, the parameters of a model of urban sharing services were identified and classified. The parameters discussed in the paper with reference to an extensive literature review describe how individual sharing services are functioning. What has also been identified is the location-specific factors as well as those related to the potential area of operation which affect the integration with public transport. In order to take all the relevant parameters into account and find a solution to the problem at hand, a multi-criteria decision-making approach has been proposed. To this end, scores and weights determining their impact on the model have been established. For purposes of the solution in question, the relevant calculations were conducted by referring to an actual need to travel between selected locations.

scholarly journals Engineering of Light Electric Commercial Vehicle

2020 ◽  
Vol 19 (1) ◽  
pp. 63-75
Author(s):  
R. Dorofeev ◽  
A. Tumasov ◽  
A. Sizov ◽  
A. Kocherov ◽  
A. Meshkov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Electric Vehicle ◽  
Electric Motor ◽  
Field Tests ◽  
Angular Speed ◽  
Maximum Energy ◽  
Driving Cycle ◽  
Thermal Calculation ◽  
Technical Solutions ◽  
The Mathematical Model

The paper describes the process and results of the development of the light commercial electric vehicle. In order to ensure maximum energy efficiency of the developed vehicle the key parameters of the original electric motor. The article also presents the results of power electronic thermal calculation. For the mathematical model of the vehicle, the driving cycle parameters of the electric platform were determined in accordance with UNECE Regulations No 83, 84. The driving cycle was characterized by four successive urban and suburban cycles. The mathematical model also takes into account the time phases of the cycle, which include idling, vehicle idling, acceleration, constant speed movement, deceleration, etc. The model of the electric part of the vehicle was developed using MatLab-Simulink (SimPowerSystems library) in addition to the mechanical part of the electric car. The electric part included the asynchronous electric motor, the motor control system and the inverter. This model at the output allows to obtain such characteristics of the electric motor as currents, flows and voltages of the stator and rotor in a fixed and rotating coordinate systems, electromagnetic moment, angular speed of rotation of the motor shaft. The developed model allowed to calculate and evaluate the performance parameters of the electric vehicle. Technical solutions of the electric vehicle design were verified by conducting strength calculations. In conclusion, the results of field tests of a commercial electric vehicle are presented.

scholarly journals Automatic Monitoring System Designed for Controlling the Stability of Underground Excavation

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Piotr MAŁKOWSKI ◽  
Zbigniew NIEDBALSKI ◽  
Łukasz BEDNAREK
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Automatic Monitoring ◽  
Mass Movements ◽  
Support Design ◽  
Automatic Monitoring System ◽  
Underground Workings ◽  
The Stability ◽  
Technical Solutions ◽  
The Given

Ensuring the stability of mining excavations is a crucial aspect of underground mining. For thispurpose, appropriate shapes, dimensions, and support of workings are designed for the given mining andgeological conditions. However, for the proper assessment of the adequacy of the used technical solutions,and the calibration of the models used in the support design, it is necessary to monitor the behavior of theexcavation. It should apply to the rock mass and the support. The paper presents the automatic systemdesigned for underground workings monitoring, and the example of its use in the heading. Electronicdevices that measure the rock mass movements in the roof, the load on the standing support, and on bolts,the stress in the rock mass, are connected to the datalogger and can collect data for a long of time withoutany maintenance, also in hard-to-reach places. This feature enables the system to be widely used, inparticular, in excavations in the vicinity of exploitation, goafs, or in the area of a liquidated exploitationfield.

Power Converters for Hybrid Electric Vehicles

2021 ◽  
pp. 168-192
Author(s):  
M. Nandhini Gayathri
Keyword(s):  
Electric Vehicles ◽  
Hybrid Electric Vehicles ◽  
Power Converters ◽  
Electric Drives ◽  
Battery Chargers ◽  
Harmful Emissions ◽  
Hybrid Electric ◽  
Battery Technology ◽  
Efficiency And Reliability

Hybrid electric vehicles have great potential to reduce fuel consumption and palliate harmful emissions for better population health and climate change. These power trains are essential to meet current emissions legislation, contribute to more environmentally friendly mobility and improve air quality in big cities. In the past two decades, due to the advent growth of modern electric drives, battery technology, and intelligent charging methodology, the overall performance of the electric vehicles have improved. Many research works have been conducted to improve the efficiency and reliability. It increases the applications of electric vehicles. Apart from grid power, the use of renewable sources makes zero-emission rate and zero fuel cost. This chapter deals with the role of power converters in hybrid electric vehicles (PHEVs). It deals with power converters used in hybrid electric vehicles, types of battery chargers, emerging power electronic devices, and thermal management of HEV power electronics, which are presented with the simulation using MATLAB software.

Active Stabilization of Axial Position of Rotor in Electric Machine

2014 ◽  
Vol 698 ◽  
pp. 141-143 ◽  
Author(s):  
Ilya Dymov ◽  
Denis Kotin
Keyword(s):  
High Precision ◽  
Electric Motor ◽  
Electric Machine ◽  
Axial Position ◽  
Axis Of Rotation ◽  
Active Stabilization ◽  
Technical Solutions

The article is devoted to the development of technical solutions centering the axis of rotation of the rotor of the electric motor during movement. Focuses on the problem of optimization of the axis of rotation of an electric machine rotor. The existing types of current unbalances of rotating part of electric machine and their causes are considered. It is specified that the methods used in practice balancing, do not meet the requirements of modern high-precision industries. A new solution to the problem of stabilization of the axial position of the rotating electric machine is suggested.

scholarly journals A Case-Study of Sustainable Countermeasures against Shallow Landslides in Central Italy

Geosciences ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 130
Author(s):  
Diana Salciarini ◽  
Evelina Volpe ◽  
Ludovica Di Pietro ◽  
Elisabetta Cattoni
Keyword(s):  
Slope Stability ◽  
Natural Environment ◽  
Mechanical Characteristics ◽  
Soil Property ◽  
Central Italy ◽  
Probabilistic Approach ◽  
Slope Stabilization ◽  
Standard Type ◽  
Technical Solutions

Traditional technical solutions for slope stabilization are generally costly and very impacting on the natural environment and landscape. A possible alternative for improving slope stability is based on the use of naturalistic engineering techniques, characterized by a low impact on the natural environment and being able to preserve the landscape identity and peculiarities. In this work, we present an application of such techniques for slope stabilization along a greenway located in central Italy, characterized by an extraordinary natural environment. First, 22 potentially unstable slopes have been identified and examined; then, among these, two standard type slopes have been selected. For both of them, an appropriate naturalistic engineering work has been proposed and stability analyses have been carried out. These have been performed by considering different piezometric conditions and using two different approaches: (a) a classical deterministic approach, which adopts deterministic values for the mechanical properties of the soils neglecting any uncertainty, and (b) a probabilistic approach that takes into account a statistical variability of the soil property values by means of their probability density functions (PDFs). The geometry of each slope derives from a digital model of the soil with 1 meter resolution, obtained through Light Detection and Ranging (LiDAR) survey provided by the Italian Ministry of the Environment. The soil mechanical characteristics and their PDFs are derived from the geotechnical soil property database of the Perugia Province. Results show an increase in slope stability produced by the adopted countermeasures measured in terms of Factor of Safety ( F s ), Probability of Failure (PoF) and efficiency.

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