公开(公告)号：US09869566B2

公开(公告)日：2018-01-16

申请号：US15042469

申请日：2016-02-12

Applicant: Allegro Microsystems, LLC

Inventor： Simon Tima ,  Yannick Vuillermet ,  Andreas P. Friedrich ,  Thomas Kerdraon

IPC: G01B7/30 ,  G01D5/20 ,  G01R33/07 ,  G01B7/14

CPC classification number: G01D5/2013 ,  G01B7/14 ,  G01D5/147 ,  G01R33/072

Abstract: A magnetic field sensor includes a back bias magnet to generate a DC magnetic field. First and second magnetic field sensing elements of the magnetic field sensor are disposed proximate to at least one ferromagnetic surface of a ferromagnetic target object. The first and second magnetic field sensing elements generate first and second electronic signals, respectively, in response to first and second sensed magnetic fields corresponding to the DC magnetic field but influenced by the at least one ferromagnetic surface. The magnetic field sensor generates a difference signal that is a difference of amplitudes of the first and second electronic signals. The difference signal is indicative of a rotation measurement of an absolute relative rotation of the ferromagnetic target object and the magnetic field sensor about a rotation axis.

公开(公告)号：US09664497B2

公开(公告)日：2017-05-30

申请号：US14570357

申请日：2014-12-15

Applicant: Allegro Microsystems, LLC

Inventor： Thomas Kerdraon ,  Andreas P. Friedrich ,  Yannick Vuillermet

IPC: G01R33/07 ,  G01R33/06 ,  G01R33/09 ,  G01B7/30 ,  G01B7/14 ,  G01D5/14 ,  G01R33/00

CPC classification number: G01B7/14 ,  G01D5/145 ,  G01R33/0005 ,  G01R33/06 ,  G01R33/072

Abstract: A magnetic field sensor with a magnet is disposed proximate to a ferromagnetic target object having at least one ferromagnetic surface. The magnetic field sensor is operable to sense a relative location between the magnetic field sensor and the ferromagnetic target object along a movement line. In some embodiments, the target object is also spinning about a rotation axis parallel to the movement line. A corresponding method is described.

公开(公告)号：US20150176962A1

公开(公告)日：2015-06-25

申请号：US14570357

申请日：2014-12-15

Applicant: ALLEGRO MICROSYSTEMS, LLC

Inventor： Thomas Kerdraon ,  Andreas P. Friedrich ,  Yannick Vuillermet

IPC: G01B7/14 ,  G01R33/06

CPC classification number: G01B7/14 ,  G01D5/145 ,  G01R33/0005 ,  G01R33/06 ,  G01R33/072

Abstract: A magnetic field sensor with a magnet is disposed proximate to a ferromagnetic target object having at least one ferromagnetic surface. The magnetic field sensor is operable to sense a relative location between the magnetic field sensor and the ferromagnetic target object along a movement line. In some embodiments, the target object is also spinning about a rotation axis parallel to the movement line. A corresponding method is described.

Abstract translation: 具有磁体的磁场传感器设置在具有至少一个铁磁表面的铁磁目标物体附近。 磁场传感器可操作以沿着移动线感测磁场传感器和铁磁目标物体之间的相对位置。 在一些实施例中，目标物体也围绕平行于移动线的旋转轴旋转。 描述相应的方法。