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

IPC: B62D5/04 ,  H02P6/16 ,  G07C5/08 ,  G01D5/14 ,  B62D15/02 ,  B60R16/033 ,  G01D5/244 ,  G01B7/30

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.

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

IPC: B62D5/04 ,  G01D5/14 ,  B60R16/033 ,  B62D15/02 ,  G07C5/08 ,  H02P6/16

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.

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

IPC: H02P6/16 ,  B62D5/04 ,  H02P6/12

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.

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

IPC: B62D5/04 ,  G01B7/30 ,  G01D5/244 ,  G01L3/10 ,  B62D15/02

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.