نتایج جستجو برای: motor vehicles
تعداد نتایج: 214245 فیلتر نتایج به سال:
OBJECTIVE The mortality rate due to traffic accidents is an information often used while making public health policies. In order to measure traffic violence, a study was carried to analyze the number of death by traffic accidents per registered motor vehicle. METHODS Based on the number of registered vehicles, population and traffic accident deaths, obtained from the Statistical Yearbook (199...
OBJECTIVES To evaluate the relationship between performance-based risk factors and subsequent at-fault motor vehicle collision (MVC) involvement in a cohort of older drivers. DESIGN Prospective cohort study. SETTING Motor Vehicle Administration (MVA) field sites in Maryland. PARTICIPANTS Of the 4,173 older drivers invited to participate in the study, 2,114 individuals aged 55 to 96 agreed...
Motor vehicles play a central role in the modern American lifestyle. The vast majority of workers travel to work by private vehicle. Motor vehicles are one of the most widely owned assets, with more than 85 percent of U.S. households owning one or more vehicles in 1992. Costs related to vehicles—vehicle purchases, operating expenses and repairs, and insurance—account for a sizable part of the t...
Induction motors are the most commonly used in the traction industries and electric vehicles, due to their low primary cost, low maintenance costs, and good performance. Speed identification is needed for the induction motor drives. However, using of speed sensors in the induction motor drives is associated with problems such as, extra cost, reduced reliability, added mounting space, etc.. Ther...
Whereas reducing carbon pollutant and fossil fuel energy consumption have become the most important environmental and economic concerns in the world, electric vehicles and their cooling system are in automotive industry manufacturers and designers agendum more than ever. Various motor electromagnetic and mechanical losses act as heat sources and could lead to performance falloff and premature e...
In this paper, a new structure of axial flux switched reluctance motors (AFSRMs) is proposed. Different combinations of rotors and stators affect motor torque and its performance. In this regard, changing the stator structure of the AFSRM leads to better results for torque and magnetic flux. The advantages of the proposed structure are short flux path, segmental rotor with improved flux density...
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