Selection of transformable production technologies as a reaction on a varying demand of electric traction motors

2014 ◽  
Author(s):  
Achim Kampker ◽  
Christoph Deutskens ◽  
Kai Kreiskother ◽  
Christian Reinders
Keyword(s):  
Traction Motors ◽  
Production Technologies ◽  
Electric Traction ◽  
Varying Demand ◽  
Selection Of

scholarly journals Selection of Optimal Magnets for Traction Motors to Prevent Demagnetization

Machines ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 124
Author(s):  
Dantam Rao ◽  
Madhan Bagianathan
Keyword(s):  
Flux Density ◽  
Electric Vehicles ◽  
Parallel Line ◽  
Low Grade ◽  
Lower Grade ◽  
Worst Case ◽  
Traction Motors ◽  
Knee Point ◽  
Point Of Intersection ◽  
Selection Of

Currently, permanent-magnet-type traction motors drive most electric vehicles. However, the potential demagnetization of magnets in these motors limits the performance of an electric vehicle. It is well known that during severe duty, the magnets are demagnetized if they operate beyond a ‘knee point’ in the B(H) curve. We show herein that the classic knee point definition can degrade a magnet by up to 4 grades. To prevent consequent excessive loss in performance, this paper defines the knee point k as the point of intersection of the B(H) curve and a parallel line that limits the reduction in its residual flux density to 1%. We show that operating above such a knee point will not be demagnetizing the magnets. It will also prevent a magnet from degenerating to a lower grade. The flux density at such a knee point, termed demag flux density, characterizes the onset of demagnetization. It rightly reflects the value of a magnet, so can be used as a basis to price the magnets. Including such knee points in the purchase specifications also helps avoid the penalty of getting the performance of a low-grade magnet out of a high-grade magnet. It also facilitates an accurate demagnetization analysis of traction motors in the worst-case conditions.

Shaft Design for Electric Traction Motors

2018 ◽  
Vol 4 (3) ◽  
pp. 720-731 ◽  
Author(s):  
Jianbin Liang ◽  
James Weisheng Jiang ◽  
Berker Bilgin ◽  
Ali Emadi
Keyword(s):  
Traction Motors ◽  
Electric Traction

Problems of development of traction drives with brushless traction motors for passenger electric locomotives

2020 ◽  
pp. 20-25
Author(s):  
Andrey Sergeevich Kosmodamianskiy ◽  
◽  
Vladimir Ivanovich Vorobyev ◽  
Mikhail Yuryevich Kapustin ◽  
Oleg Vasilyevich Izmerov ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Rotation Frequency ◽  
Axial Direction ◽  
Traction Drive ◽  
Traction Motors ◽  
Adaptability To Manufacture ◽  
Traction Drives ◽  
Conducting Research ◽  
The One ◽  
Electric Traction

The paper considers a problem of creation of new traction drives with brushless electric traction motors (ETM) for passenger locomotives. Analysis of drive designs revealed that the increase of power of induction motors through the increase of rotation frequency leads to the contradiction between requirements for the design reliability, on the one hand, and requirements for technological simplicity, on the other hand. In order to solve the contradiction it is necessary to use ETM designs that have enhanced torque and minimal dimensions in axial direction. It is established that ETM with disk rotor (axial magnetic flux) satisfy such requirements. The authors proposed an aggregate scheme of support-frame traction drives that include ETM with disk rotor, which allows significantly increasing the adaptability to manufacture and repairability of drive at preservation of reliability. As a result, the authors made a conclusion about the reasonability of conducting research and development work on creation of locomotive ETM with axial magnetic flux. The authors have submitted an application for a patent on the proposed design of traction drive.

Development Environment to Increase Efficiency of Electric Traction Motors

ATZ worldwide ◽  
2016 ◽  
Vol 118 (12) ◽  
pp. 56-61
Author(s):  
Helge Saß ◽  
Gerd Stöhr ◽  
Dennis Kuhl ◽  
Ludwig Brabetz
Keyword(s):  
Development Environment ◽  
Traction Motors ◽  
Electric Traction ◽  
Increase Efficiency

scholarly journals Determinants of Adoption of Cassava Technologies by Male Farmers in Nasarawa State, Nigeria

1970 ◽  
Vol 19 (1) ◽  
pp. 117-127
Author(s):  
ME Ejechi
Keyword(s):  
Sampling Technique ◽  
Descriptive Statistics ◽  
Logit Regression ◽  
Multi Stage ◽  
Cassava Production ◽  
Production Technologies ◽  
Logit Regression Model ◽  
Very High ◽  
Selection Of ◽  
Structured Questionnaire

The study investigated determinants of adoption of recommended cassava production technologies among male farmers in Nasarawa State. Multi-stage sampling technique was employed for the selection of the respondent. Structured questionnaire was used for data collection. The data were collected from 60 male cassava farmers selected from 6 out of 13 LGAs in the State. They were Karu, Kokona, Akwanga, NasarawaEggon, Lafia and Obi. Data were analysed with both descriptive and inferential statistics. Descriptive statistics such as frequency tables, and percentage were used to describe socio-economic characteristics of the respondents. Logit regression model was used to estimate the determinants of adoption of these practices. The results showed that awareness and adoption of these practices were very high (Awareness of all the practices ranges from 90% to 98.3% while the adoption is from 63.3% to 90%). Factors that positively and significantly influenced adoption by male farmers were income (p=0.01) and extension contact (p=0.1). The conclusion was that men made remarkable contribution in cassava production. It was recommended that Governments at all levels formulate policies aimed at encouraging and motivating male cassava farmers. Provision of loans to male farmers and subsidizing of inputs should be ae necessary. Cassava processing industries should be established to add value and increase income.Keywords: Adoption, Cassava Technologies, Male farmers.

scholarly journals Algorithm for selecting motor and trailer cars in a freight train of motor-car traction according to the energy efficiency criterion

2020 ◽  
Vol 6 (1) ◽  
pp. 104-119 ◽  
Author(s):  
Pavel S. Troitskiy
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy System ◽  
Control Algorithms ◽  
Efficiency Criterion ◽  
Freight Train ◽  
Traction Motors ◽  
Perishable Goods ◽  
Train Operation ◽  
Selection Of

Background: improving the efficiency of freight transport is one of the main challenges facing the world's Railways. One of the most effective solutions is the introduction of distributed motor-car cargo traction. This will significantly increase the operational efficiency of the train's power plant, improve its handling, reduce the amount of destructive impact on the track, increase the capacity of railway lines and the reliability of deliveries of perishable goods. When considering the allocation algorithm for operating the traction motors (TED) on the composition of a diesel freight trains subject to the conditions of alignment resource all TED motor coaches concluded the possibility of increasing the efficiency of multimotor traction drive modular freight trains using the proposed control algorithms for energy efficiency. Aim: formalization of the task of selecting motor and trailer cars in a modular electric freight train. Methods: In article the algorithm of selection of motor and trailer cars on a freight train railcar traction on the criterion of energy efficiency, the benefits of adopting a modular truck trains, are the main prerequisites for the implementation of distributed railcar truck pull. The work is based on the theory of traction calculations for train operation and is aimed at ensuring safe and energy-efficient traffic along the route sections. Results: The developed algorithm of selection of motor and trailer cars in a unit train freight based on the condition of ensuring the traction and coupling properties of the train on the current upgrades, the development of the total volume of cargo offered for transport and energy efficiency of this type of traction. When using the proposed algorithms for managing the energy efficiency of a motor-car electric train by selecting motor and trailer cars, adjusting the power, number of traction engines and their distribution by the composition of the traun, energy consumption on the Medvezhya Gora Noviy Poselok section can be reduced by 20.5% in the direction there and by 18.9% in the direction back without changing the traffic schedule. And when compared with a locomotive-hauled train that regulates energy consumption using the same algorithm by 4.49% and 3.61%, respectively. Energy consumption on the Krivenkovskaya Goitkh section can be reduced by 16% in the direction there and by 82% in the direction back without changing the traffic schedule. And when compared with a locomotive-hauled train that regulates energy consumption by the same algorithm by 1.61% and 65.92%, respectively. Conclusions: The author proposes an algorithm for selecting motor and trailer cars in a freight train of motor-car traction according to the criterion of energy efficiency with the condition of ensuring traction and coupling properties on the calculated lifts. As well as the algorithm of distribution of working traction engines by the composition of the freight trains, taking into account the requirement of equalizing the resource of their work, preventing overheating and hypothermia of the fuel and energy system, and improving train handling.

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