公开(公告)号：US20190238066A1

公开(公告)日：2019-08-01

申请号：US16339468

申请日：2017-09-29

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Wataru HATSUSE ,  Masaki KOYAMA ,  Shuhei NAGATA ,  Takahiro SUZUKI

IPC: H02M7/5387

CPC classification number: H02M7/53871 ,  H02M7/5387 ,  H02M7/5388

Abstract: 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

Applicant: Hitachi Automotive Systems, Ltd. ,  Hitachi Industrial Equipment Systems Co., Ltd.

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

IPC: H02K33/06 ,  F04B35/04

Abstract: 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

Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.

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

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

Abstract: 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.

公开(公告)号：US20210071653A1

公开(公告)日：2021-03-11

申请号：US16979035

申请日：2019-02-19

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Kaito HOTTA ,  Wataru HATSUSE ,  Masaki KOYAMA ,  Tsutomu ITO ,  Yoshinori KAWAI

IPC: F04B35/04 ,  F04B49/06

Abstract: Provided are a linear compressor and a linear compressor control system that do not require a sensor for detecting a position of a mover, and can compute a mover position with high accuracy, in consideration of position dependency of an induced voltage constant. A linear compressor 20 includes a field element 11 having a first end connected to elastic bodies (201a and 201b) and including a permanent magnet 111, an armature 12 having a winding 122 wound around a magnetic pole 121, and a linear motor 10 that causes the field element 11 and the armature 12 to reciprocate relatively in an axial direction. A stroke of a piston is controlled so that a portion where a gradient of an induced voltage when the induced voltage computed on the basis of a voltage command value output to the linear motor 10 and a value of a current flowing through the winding 122 is at a predetermined value is within a predetermined range corresponds to a top dead center and/or a bottom dead center of a stroke of a piston 212 connected to a second end of the field element 11.

公开(公告)号：US20210001678A1

公开(公告)日：2021-01-07

申请号：US16980529

申请日：2018-10-10

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Masaki KOYAMA ,  Kaito HOTTA ,  Wataru HATSUSE ,  Tsutomu ITO ,  Yoshinori KAWAI ,  Takahiro SUZUKI

IPC: B60G17/015 ,  B60S1/60 ,  F04B35/04

Abstract: A highly reliable and highly efficient air suspension system for a vehicle is provided by improving the trackability of stroke control with respect to pressure fluctuations applied to a linear compressor, suppressing stroke increase due to pressure drop, preventing piston collision, and increasing a flow rate by reducing dead volume. To realize this, the air suspension system includes an air suspension that supplies and discharges compressed air to adjust a length, a compressor body in which a piston reciprocates in a cylinder to compress air, a linear motor that reciprocates the piston, a tank that is connected to the air suspension or the compressor body and stores compressed air, a solenoid valve that opens and closes the air suspension or the tank, and an inverter that changes power supplied to the linear motor according to an open and closed state of the solenoid valve to perform position control of the piston.