公开(公告)号：US20190238066A1

公开(公告)日：2019-08-01

申请号：US16339468

申请日：2017-09-29

申请人： Hitachi Automotive Systems, Ltd.

发明人： Wataru HATSUSE ,  Masaki KOYAMA ,  Shuhei NAGATA ,  Takahiro SUZUKI

IPC分类号： H02M7/5387

CPC分类号： H02M7/53871 ,  H02M7/5387 ,  H02M7/5388

摘要： Provided are a power conversion device and a system using the same, which can reduce loss of each semiconductor element in a power conversion circuit and enable high efficiency of a device controlled by the power conversion device. The power conversion device includes a direct current (DC) power source; and a full-bridge circuit having first upper and lower arms having an upper element and a lower element and second upper and lower arms having an upper element and a lower element, in which the first upper and lower arms and the second upper and lower arms are electrically connectable to a device, and ON resistances of the upper element of the first upper and lower arms and the lower element of the second upper and lower arms are smaller than ON resistances of the lower element of the first upper and lower arms and the upper element of the second upper and lower arms.

公开(公告)号：US20190356207A1

公开(公告)日：2019-11-21

申请号：US16476340

申请日：2017-10-25

申请人： Hitachi Automotive Systems, Ltd. ,  Hitachi Industrial Equipment Systems Co., Ltd.

发明人： Masaki KOYAMA ,  Shuhei NAGATA ,  Naoyuki OOHATA ,  Kan KOBAYASHI ,  Yoshinori KAWAI

IPC分类号： H02K33/06 ,  F04B35/04

摘要： An object of the present invention is to provide a linear motor and a compressor which are effective against a non-fixed structure in which end portions of a resonant spring are not fixed and are capable of restraining loads in an up-down direction and a left-right direction which act on a slider. A linear motor includes a slider (2) which is driven in a first direction, a resonance spring (400) which is capable of vibrating in the first direction, and a permanent magnet (210) which is provided at the slider (2) and is magnetized in a second direction perpendicular to the first direction. The linear motor includes a bearing (480) that is movable against both forces of a force in the second direction and a force in a third direction perpendicular to the first direction and the second direction, and an elastic-body support member (450) which connects the resonant spring (400) and the bearing (480) to each other.

公开(公告)号：US20180304718A1

公开(公告)日：2018-10-25

申请号：US15762942

申请日：2016-09-20

申请人： HITACHI AUTOMOTIVE SYSTEMS, LTD.

发明人： Shinji SETO ,  Masaki KOYAMA ,  Shuhei NAGATA ,  Takashi OGAWA ,  Yosuke TANABE ,  Takahiro SUZUKI ,  Kan KOBAYASHI ,  Naofumi HARADA ,  Yoshinori KAWAI ,  Tomoyuki RI

IPC分类号： B60G17/04 ,  B60G11/27 ,  B60G17/052 ,  F04B35/04 ,  B60G17/056

摘要： In an air suspension system, starting of a compressor is facilitated in a condition in which there exists a pressure difference. There is provided an air suspension system in which air compressed by a compressor is supplied to a plurality of air chambers provided between a vehicle body side and a wheel side and configured to perform vehicle height adjustment in accordance with the supply and discharge of air. The compressor has a needle connected to a piston and extending in a moving direction of the piston, and an armature reciprocating the needle in the moving direction of the piston.