公开(公告)号：US20170261342A1

公开(公告)日：2017-09-14

申请号：US15448984

申请日：2017-03-03

Applicant: TDK Corporation

Inventor： Masaki NAGATA ,  Hiraku HIRABAYASHI ,  Yohei HIROTA

IPC: G01D5/14 ,  G01D5/165

Abstract: A rotation angle sensing device is provided with a magnet that is placed to be integrally rotatable with a rotary shaft of a rotating body in association with a rotating body, where the shape of the magnet as viewed along the rotary shaft is substantially circular; a magnetic sensor part that outputs a sensor signal based upon a change in a direction of a magnetic field in association with the rotation of the magnet; and a rotation angle detecting part that detects a rotation angle of the rotating body based upon the sensor signal output by the magnetic sensor part. The magnet has a component of a magnetization vector in a direction that is orthogonal to the rotary shaft. When a circular virtual plane that is orthogonal to the rotary shaft centering upon the rotary shaft is set in the vicinity of the magnet, the magnetic sensor part is placed at a position where the amplitudes of the magnetic field intensity Hr in the radial direction and the magnetic field intensity Hθ in the circumferential direction on the virtual plane are substantially the same, and the magnetic field intensity Hr in the radial direction and/or the magnetic field intensity Hθ in the circumferential direction are/is output as the sensor signal.

公开(公告)号：US20170059362A1

公开(公告)日：2017-03-02

申请号：US15234042

申请日：2016-08-11

Applicant: TDK Corporation

Inventor： Hiroshi NAGANUMA ,  Yohei HIROTA ,  Kunihiro UEDA

IPC: G01D5/16

CPC classification number: G01D5/16 ,  G01D5/147

Abstract: A magnetic field detection apparatus has a first magnetic sensor and a bias magnet positioned to face the first magnetic sensor. The bias magnet has a magnetic pole surface that faces the first magnetic sensor and that applies a bias magnetic field to the first magnetic sensor. The first magnetic sensor detects magnetic field in a first direction that is parallel to the magnetic pole surface. The magnetic pole surface of the bias magnet has a plurality of grooves arranged in the first direction.

Abstract translation: 磁场检测装置具有第一磁传感器和定位成面对第一磁传感器的偏置磁体。 偏置磁体具有面向第一磁传感器的磁极表面，并且向第一磁传感器施加偏置磁场。 第一磁传感器在平行于磁极表面的第一方向检测磁场。 偏置磁体的磁极表面具有沿第一方向布置的多个槽。

公开(公告)号：US20160169707A1

公开(公告)日：2016-06-16

申请号：US15051373

申请日：2016-02-23

Applicant: TDK CORPORATION

Inventor： Yohei HIROTA ,  Homare TOKIDA ,  Hiraku HIRABAYASHI ,  Kazuma YAMAWAKI

IPC: G01D5/20

CPC classification number: G01D5/20 ,  G01D5/145 ,  G01R33/09 ,  G01R33/093

Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.

公开(公告)号：US20150260546A1

公开(公告)日：2015-09-17

申请号：US14508101

申请日：2014-10-07

Applicant: TDK CORPORATION

Inventor： Yohei HIROTA

IPC: G01D5/14

CPC classification number: G01D5/14 ,  G01D5/145

Abstract: A rotating field sensor includes four detection circuits and a computing unit. In the computing unit, defined are four first detection circuit groups each consisting of three detection circuits. Further, defined in each first detection circuit group are three second detection circuit groups each consisting of two detection circuits. The computing unit calculates an angle value for each of all the second detection circuit groups on the basis of the output signals of the two detection circuits, extracts one or more normal first detection circuit groups each of which is such one that all three angle values corresponding to the three second detection circuit groups fall within an angle range of a predetermined breadth, and determines an angle detection value on the basis of at least one of all angle values corresponding to all second detection circuit groups belonging to the one or more normal first detection circuit groups.

Abstract translation: 旋转场传感器包括四个检测电路和一个计算单元。 在计算单元中，定义了四个第一检测电路组，每组包括三个检测电路。 此外，在每个第一检测电路组中定义的是三个第二检测电路组，每组由两个检测电路组成。 计算单元基于两个检测电路的输出信号计算所有第二检测电路组中的每一个的角度值，提取一个或多个正常的第一检测电路组，每个正常的第一检测电路组是所有三个角度值对应的 三个第二检测电路组落在预定宽度的角度范围内，并且基于与属于一个或多个正常第一检测的所有第二检测电路组对应的所有角度值中的至少一个来确定角度检测值 电路组。

公开(公告)号：US20150204696A1

公开(公告)日：2015-07-23

申请号：US14499891

申请日：2014-09-29

Applicant: TDK CORPORATION

Inventor： Yohei HIROTA ,  Hiraku HIRABAYASHI

IPC: G01D5/16

CPC classification number: G01D5/16 ,  G01D5/145 ,  G01R33/09

Abstract: A rotating field sensor includes four detection circuits each of which generates an output signal responsive to the direction of a rotating magnetic field, and an angle calculation unit configured to calculate four angle values in correspondence to four groups each consisting of two detection circuits selected from the four detection circuits. The angle calculation unit calculates each of the four angle values on the basis of two output signals of the two detection circuits constituting a corresponding one of the four groups.

Abstract translation: 旋转场传感器包括四个检测电路，每个检测电路响应于旋转磁场的方向产生输出信号;以及角度计算单元，被配置为计算与四个组对应的四个角度值，每组包括两个检测电路， 四个检测电路。 角度计算单元基于构成四组中的相应一个的两个检测电路的两个输出信号来计算四个角度值中的每一个。