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1 – 10 of over 11000Hokyung Shim, Jihyun Kim and Jungpyo Hong
The purpose of this paper is to study the electric vehicle (EV) drive efficiency of a traction motor considering regenerative braking according to various motor cores.
Abstract
Purpose
The purpose of this paper is to study the electric vehicle (EV) drive efficiency of a traction motor considering regenerative braking according to various motor cores.
Design/methodology/approach
A software program was developed to predict the driving performance of an EV. It determines the driving mileage, the required power of the traction motor, and the operation points on a torque-speed map when drive cycles are given. The driving performance is calculated from the battery capacity, vehicle specification, and efficiency map of the traction motor computed using the finite element analysis.
Findings
As a result, the motor core is a significant design variable for raising the driving mileage of an EV. It is noted that the change of electrical steels used for the motor core is the lowest priced method of increasing the driving range by 2 km.
Originality/value
The comparative analysis of motor core by replacing 35PN250 to 25PNX1250F results in improvement effects traveling 4.62 and 5.16 km farther in the Simplified Federal Urban Driving Schedule (SFUDS) and Highway Fuel Economy Driving Schedule (HWFET), respectively. It was also verified that regenerative braking system is able to enhance drive efficiency by 29-31.3 km in the SFUDS and 6.5-7.3 km in the HWFET. From comparison of price rise for increasing driving mileage by 2 km, it is noted that the change of electrical steels used for the motor core is the lowest priced method.
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Purpose – The chapter reviews the relationship between cities, urban form and cycling and identifies generally accepted understandings, issues about which more remains to be known…
Abstract
Purpose – The chapter reviews the relationship between cities, urban form and cycling and identifies generally accepted understandings, issues about which more remains to be known and some prescriptions for future action.
Approach – The discussion is based on evidence drawn from the cycling literature and from primary data collected by the authors.
Findings – Land use patterns and densities have an impact on the level of cycling and, despite some remaining methodological difficulties, it appears that cities which invest in infrastructure for cycling display greater levels of cycle use. Issues which remain in contention and require further analysis include the balance between provision for cycle traffic which is separated from motor traffic and the nature of that provision, the extent to which cycle traffic may directly substitute for trips by motor vehicle and the complexity of estimating the benefits of cycling.
Implications – Planning for cycle traffic needs to be undertaken on an area wide basis and synergistically with traffic management for motor traffic, and such planning should have due regard to the distances for which cycling is most competitive. There remains untapped potential for chaining cycle trips with public transport trips.
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Electric motor heating during biomass recovery and its handling on conveyor is a serious concern for the motor performance. Thus, the purpose of this paper is to design and…
Abstract
Purpose
Electric motor heating during biomass recovery and its handling on conveyor is a serious concern for the motor performance. Thus, the purpose of this paper is to design and develop a hardware prototype of master–slave electric motors based biomass conveyor system to use the motors under normal operating conditions without overheating.
Design/methodology/approach
The hardware prototype of the system used master–slave electric motors for embedded controller operated robotic arm to automatically replace conveyor motors by one another. A mixed signal based embedded controller (C8051F226DK), fully compliant with IEEE 1149.1 specifications, was used to operate the entire system. A precise temperature measurement of motor with the help of negative temperature coefficient sensor was possible due to the utilization of industry standard temperature controller (N76E003AT20). Also, a pulse width modulation based speed control was achieved for master–slave motors of biomass conveyor.
Findings
As compared to conventional energy based mains supply, the system is self-sufficient to extract more energy from solar supply with an energy increase of 11.38%. With respect to conventional energy based \ of 47.31%, solar energy based higher energy saving of 52.69% was reported. Also, the work achieved higher temperature reduction of 34.26% of the motor as compared to previous cooling options.
Originality/value
The proposed technique is free from air, liquid and phase-changing material based cooling materials. As a consequence, the work prevents the wastage of these materials and does not cause the risk of health hazards. Also, the motors are used with their original dimensions without facing any leakage problems.
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TO answer the question, “What are the best fuels for aircraft?” might seem at first sight neither more nor less difficult than to say, What are the best fuels for motor cars?…
Abstract
TO answer the question, “What are the best fuels for aircraft?” might seem at first sight neither more nor less difficult than to say, What are the best fuels for motor cars? There is, however, one added factor, namely, that of weight, and this adds greatly to the complexity of the question.
Miguel Pina E. Cunha and João Vieira Da Cunha
Change has become one of the most studied topics in management research. Although literally hundreds of research initiatives on this theme are carried out annually, there are…
Abstract
Change has become one of the most studied topics in management research. Although literally hundreds of research initiatives on this theme are carried out annually, there are still important questions in this area that have been left unanswered. There are two, logically possible, modes of change that have yet to be identified and there are at least two tensions that go unresolved: the punctuated versus incremental change and the emergent versus deliberate change tensions. Drawing on a “grounded theory” research on organizational improvisation, we argue that this phenomenon contributes toward filling one of the gaps in a taxonomy of organizational change modes and toward a synthesis between the poles of the two tensions mentioned above.
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Fish bait and generators, water power equipment and motor bikes are just some of the boom products
As the municipal year ends this month, the public librarian will lightly (or otherwise) turn to thoughts of annual reports. Year by year the problem before him is to justify his…
Abstract
As the municipal year ends this month, the public librarian will lightly (or otherwise) turn to thoughts of annual reports. Year by year the problem before him is to justify his ways to men, by producing a document which in the first place is attractive and in the second, third, and as many other places as possible, is true, logical, readable. It is no easy task, especially for those who are new to the experiment or who have made it for so many years that ideas do not come freely ; for, after all, the annual report is a question of ideas. If our minds are of pedestrian, unoriginal—or perhaps infertile is a better word, as originality is as rare as a new planet— type, we shall copy one of the received models, and will be well advised to do so. That is to say, we shall give a brief narrative of what we think are the outstanding events of the year with suitable acknowledgments to committee and staff, and add such statistical tables as will prove the position. These last are always to be summarised in the form prescribed by the Library Association ; the omission of such summary is inexcusable in the modern librarian.
Whereas the Minister of Labour (hereafter in this Order referred to as “the Minister”) has received from the Hollow‐ware Wages Council (Great Britain) the wages regulation…
Abstract
Whereas the Minister of Labour (hereafter in this Order referred to as “the Minister”) has received from the Hollow‐ware Wages Council (Great Britain) the wages regulation proposals set out in Schedules 1 and 2 hereof;
Whereas the Minister of Labour (hereafter in this Order referred to as “the Minister”) has received from the Hollow‐ware Wages Council (Great Britain) the wages regulation…
Abstract
Whereas the Minister of Labour (hereafter in this Order referred to as “the Minister”) has received from the Hollow‐ware Wages Council (Great Britain) the wages regulation proposals set out in Schedules 1 and 2 hereof;