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Yamamoto S.,AutoNetworks Technologies Ltd. | Kusawake K.,Advanced Automotive Systems R and nter | Ido J.,Sumitomo Wiring Systems Ltd. | Kawaguchi H.,Sumitomo Wiring Systems Ltd. | And 2 more authors.
SEI Technical Review | Year: 2014

The number of motorized vehicles, such as hybrid and electric ones, are increasing rapidly due to environmental concerns, energy saving efforts and the increasing oil price. To promote the use of these vehicles, motors need to be reduced in size and weight, while also ensuring driving and acceleration performance comparable to that of gasoline vehicles. We have developed a small and lightweight reactor∗1, a key component for a boost converter used in a motor. Using a new magnetic material and heat dissipation structure, we have succeeded in a size and weight reduction of the reactor by 10%, while maintaining the same performance level as conventional reactors.


Igarashi N.,Sumitomo Electric | Uozumi M.,Sumitomo Electric | Kosuge T.,Sumitomo Electric | Sato A.,Advanced Automotive Systems R and nter | And 2 more authors.
SEI Technical Review | Year: 2015

With the recent increased interest in the environment, there is a growing demand for environmentally friendly vehicles like hybrid electric vehicle (HEV) and plug-in hybrid electric vehicle (PHEV). This product is a soft magnetic composite core used for boost converter of motor drive system in HEV or PHEV. With soft magnetic composite core, we successfully downsized and reduced weight compared with conventional electromagnetic steel sheet core by utilizing characteristics of high magnetic flux density and isotropic magnetic properties. In this development, we satisfied the demand of downsizing and weight reduction by: using pure and fine iron powder which is superior in downsizing, optimizing powder particle size, examining (or re-designing) of the product shape to maximize the characteristics of the soft magnetic composite, and developing surface modification method by laser processing. As a result, we developed the pure iron-based soft magnetic composite core for automotive reactor that had been produced by electromagnetic steel sheet, and achieved 10% of downsizing and weight reduction with the same performance. © 2015, Sumitomo Electric Industries Ltd. All rights reserved.


Washimi K.,Systems and Electronics Division | Kuramoto M.,Infocommunication and Social Infrastructure Systems R and nter | Hayasaki T.,Advanced Automotive Systems R and nter
SEI Technical Review | Year: 2014

Traffic conditions in Japan have been improved through the widespread use of traffic control systems, including signal controllers, in the late 1960s and the electronic toll collection systems in the 1990s. Currently, efforts for further reduction of traffic congestion and accidents have been made by using intelligent transport system (ITS) technology that wirelessly connects vehicles to vehicles and vehicles to infrastructure. ITS technology has now further advanced through the emergence of advanced infrared beacons. In emerging economies, on the other hand, there have been serious traffic congestion issues and increased road accidents due to rapid growth. ITS and its wireless communication technology are expected to be used in building effective signal control systems at low cost. To meet these global expectations, Sumitomo Electric Industries, Ltd. will continue to work on the development of ITS technology, drawing on its wide ranging expertise.


Izumi T.,Advanced Automotive Systems R and nter | Hirota M.,Advanced Automotive Systems R and nter | Hatanaka K.,Advanced Automotive Systems R and nter | Isoyama Y.,Advanced Automotive Systems R and nter | And 2 more authors.
SEI Technical Review | Year: 2014

The concept of vehicle-to-X (V2X), which transmits electricity from an on-board battery to infrastructure, is expected to be a key to smart grids. With V2X technology, we can use electricity stored in large-capacity batteries of electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) when necessary. To realize this concept, Sumitomo Electric Industries, Ltd. has developed various technologies related to EVs, PHEVs, and infrastructure. This paper outlines our EV and PHEV bidirectional charging unit to be used for "V2X" power flow.

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