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公开(公告)号：US20190041240A1
公开(公告)日：2019-02-07
申请号：US16073870
申请日：2017-04-19
Applicant: NSK Ltd.
Inventor： Masaki KUWAHARA
Abstract: A rotation angle detector includes: a multipolar magnet ring magnetized multipolarly along a circumferential direction, at least one magnetic sensor group including three magnetic sensors being placed along the circumferential direction of the multipolar magnet ring, and outputting angle information in association with the rotation of the multipolar magnet ring, the respective pieces of the angle information having a phase difference therebetween of 120 degrees in an electrical angle, and an arithmetic unit configured to calculate a rotation angle of the multipolar magnet ring based on the angle information outputted from the three magnetic sensors included in the magnetic sensor group.
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公开(公告)号：US20190039645A1
公开(公告)日：2019-02-07
申请号：US16073883
申请日：2017-04-26
Applicant: NSK Ltd.
Inventor： Masaki KUWAHARA , Shigeyuki UEMATSU
Abstract: To provide a motor drive control device, an electric power steering device, and a vehicle which can individually diagnose abnormalities of magnetic detection elements, designed in a multisystem configuration to include at least two systems, for each system. A motor drive control device includes two systems of first and second rotation information detection function units. The first and second rotation information detection function units include first and second rotation position information detection units and first and second rotation information detection units. The first and second rotation information detection units individually diagnose their own abnormalities based on first and second motor rotation position signals detected by the first and second rotation position information detection units.
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公开(公告)号：US20170005549A1
公开(公告)日：2017-01-05
申请号：US15105129
申请日：2015-01-14
Applicant: NSK LTD.
Inventor： Kazuhiro OHIRA , Masaki KUWAHARA
IPC: H02K11/225 , G01D5/20
CPC classification number: H02K11/225 , G01D5/2046 , H02K24/00 , H02K37/04
Abstract: A resolver device includes a stator core and a rotor core supported so as to be freely rotatable with respect to the stator core and configured such that a reluctance component in a gap between the rotor core and the stator core changes in accordance with a relative angle position to the stator core. The stator core includes stator main poles and stator interpoles.
Abstract translation: 旋转变压器装置包括：定子铁芯和转子铁芯，其被支撑成能够相对于定子铁心自由旋转，并且构造成使得转子铁心和定子铁芯之间的间隙中的磁阻分量根据相对的角度位置而变化 到定子铁心。 定子铁芯包括定子主极和定子间极。
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Patent Agency Ranking
公开(公告)号：US20200062300A1
公开(公告)日：2020-02-27
申请号：US16666602
申请日：2019-10-29
Applicant: NSK Ltd.
Inventor： Masaki KUWAHARA , Shigeyuki UEMATSU
Abstract: To provide a motor drive control device, an electric power steering device, and a vehicle which can individually diagnose abnormalities of magnetic detection elements, designed in a multisystem configuration to include at least two systems, for each system. A motor drive control device includes two systems of first and second rotation information detection function units. The first and second rotation information detection function units include first and second rotation position information detection units and first and second rotation information detection units. The first and second rotation information detection units individually diagnose their own abnormalities based on first and second motor rotation position signals detected by the first and second rotation position information detection units.
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公开(公告)号：US20200041308A1
公开(公告)日：2020-02-06
申请号：US16605900
申请日：2018-04-11
Applicant: NSK LTD.
Inventor： Masaki KUWAHARA , Kazuhiro OHIRA
Abstract: A rotation angle detection device includes: a rotating body having magnetic tracks on which magnetic pole pairs are arranged at even intervals in concentric ring shapes; magnetic sensors each configured to detect a magnetic field of a corresponding one of the magnetic tracks and output a sine signal and a cosine signal; storage configured to store magnetic sensor correction information; a correction calculator configured to correct the sine signal and the cosine signal based on the magnetic sensor correction information; a phase detector configured to calculate a phase of the corrected sine signal and the corrected cosine signal; a phase difference detector configured to calculate a phase difference between a plurality of the phases; and an angle calculator configured to convert the phase difference into an absolute angle.
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公开(公告)号：US20180234039A1
公开(公告)日：2018-08-16
申请号：US15570453
申请日：2017-04-26
Applicant: NSK Ltd.
Inventor： Masaki KUWAHARA , Shigeyuki UEMATSU
CPC classification number: H02P6/16 , B62D5/04 , B62D5/0463 , B62D5/0475 , B62D5/0484 , B62D6/00 , H02P6/12 , H02P29/00
Abstract: The motor drive control apparatus includes first and second rotation information detection function units and a power control unit. When it is determined the ignition switch is changed from the ON state to the OFF state, the power control unit intermittently supplies power from a battery to the first and second rotation information detection function units at a first interval while a motor rotation number is lower than a preset rotation number set in advance. When it is determined the motor rotation number becomes equal to or higher than the preset rotation number during this intermittent supply state, the power control unit intermittently supplies the power from the battery to the first and second rotation information detection function units at a second interval shorter than the first interval while the motor rotation number is equal to or higher than the preset rotation number.
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7.发明申请公开(公告)号：US20180154926A1
公开(公告)日：2018-06-07
申请号：US15578064
申请日：2016-06-24
Applicant: NSK Ltd.
Inventor： Kazuhiro OHIRA , Masaki KUWAHARA , Sumio SUGITA , Shigeyuki UEMATSU
CPC classification number: B62D5/0406 , B62D5/04 , B62D15/02 , G01B7/30 , G01D5/244 , G01D5/2451 , G01L3/10 , G01L3/104
Abstract: There are provided a relative angle detection device suitable for expanding a torque detection range, and a torque sensor, an electric power steering device and a vehicle including the relative angle detection device. Based on a first sine signal representing sin(θos+Δθ) and a first cosine signal representing cos(θos+Δθ) in accordance with a rotation angle(θis) of a first multipolar ring magnet that synchronously rotates with an input shaft from between the coaxially arranged input shaft and an output shaft, and based on a second sine signal representing sin θos and a second cosine signal representing cos θos in accordance with a rotation angle(θos) of a second multipolar ring magnet that synchronously rotates with the output shaft, sin Δθ and cos Δθ are calculated in accordance with a relative angle(Δθ) between the input shaft and the output shaft, and from Δθ=arctan(sin Δθ/cos Δθ), the relative angle(Δθ) is calculated.
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公开(公告)号：US20160252410A1
公开(公告)日：2016-09-01
申请号：US15032402
申请日：2014-11-04
Applicant: NSK LTD.
Inventor： Seiichi TESHIGAWARA , Kazuteru TOBITA , Masaki KUWAHARA
CPC classification number: G01L1/005 , G01D5/12 , G01D5/30 , G01L1/2206 , G01L5/166
Abstract: A force sensor includes: a base; a first movable portion arranged to face the base; a second movable portion arranged to face the first movable portion; a support that is provided on the base and rockably supports the first movable portion and the second movable portion; a joint that is provided to the support and rotatably supports the second movable portion; and a first detection unit that can detect a force component causing the first movable portion and the second movable portion to rock and a second detection unit that can detect a force component causing the second movable portion to rotate, when external force is applied to at least one of the first movable portion and the second movable portion.
Abstract translation: 力传感器包括：基座; 布置成面向基座的第一可移动部分; 第二可移动部分，布置成面对第一可移动部分; 设置在基座上并支撑第一可移动部分和第二可移动部分的支撑件; 接头，其设置在所述支撑体上并可旋转地支撑所述第二可动部; 以及第一检测单元，其能够检测使所述第一可移动部分和所述第二可移动部分摇动的力分量;以及第二检测单元，当外力至少施加到所述第二检测单元时，所述第二检测单元能够检测导致所述第二可移动部分旋转的力分量 第一可移动部分和第二可移动部分中的一个。
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